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• Unable to start sublime text

  - by Pramod

  I had been using Sublime Text 2 with no issues. I installed IDLE and now I'm unable to start Sublime Text. I tried uninstalling IDLE, but Sublime Text is still not starting. Here's the error: Unable to load libgdk-x11-2.0.so Unable to load gdk_cairo_create from libgdk-x11-2.0.so Unable to load gdk_cursor_new_for_display from libgdk-x11-2.0.so Unable to load gdk_cursor_unref from libgdk-x11-2.0.so Unable to load gdk_error_trap_pop from libgdk-x11-2.0.so Unable to load gdk_error_trap_push from libgdk-x11-2.0.so Unable to load gdk_input_add from libgdk-x11-2.0.so Unable to load gdk_input_remove from libgdk-x11-2.0.so Unable to load gdk_keymap_translate_keyboard_state from libgdk-x11-2.0.so Unable to load gdk_keyval_to_unicode from libgdk-x11-2.0.so Unable to load gdk_pixbuf_new_from_file from libgdk-x11-2.0.so Unable to load gdk_region_get_rectangles from libgdk-x11-2.0.so Unable to load gdk_screen_get_default from libgdk-x11-2.0.so Unable to load gdk_screen_get_display from libgdk-x11-2.0.so Unable to load gdk_screen_get_height from libgdk-x11-2.0.so Unable to load gdk_screen_get_rgb_colormap from libgdk-x11-2.0.so Unable to load gdk_screen_get_rgba_colormap from libgdk-x11-2.0.so Unable to load gdk_screen_get_root_window from libgdk-x11-2.0.so Unable to load gdk_screen_get_width from libgdk-x11-2.0.so Unable to load gdk_screen_get_n_monitors from libgdk-x11-2.0.so Unable to load gdk_screen_get_monitor_geometry from libgdk-x11-2.0.so Unable to load gdk_unicode_to_keyval from libgdk-x11-2.0.so Unable to load gdk_window_get_frame_extents from libgdk-x11-2.0.so Unable to load gdk_window_get_origin from libgdk-x11-2.0.so Unable to load gdk_window_get_state from libgdk-x11-2.0.so Unable to load gdk_window_invalidate_rect from libgdk-x11-2.0.so Unable to load gdk_window_set_cursor from libgdk-x11-2.0.so Unable to load gdk_window_move_resize from libgdk-x11-2.0.so Unable to load gdk_x11_display_get_xdisplay from libgdk-x11-2.0.so Unable to load gdk_x11_drawable_get_xid from libgdk-x11-2.0.so Unable to load gdk_x11_get_server_time from libgdk-x11-2.0.so Unable to load gdk_x11_get_xatom_by_name_for_display from libgdk-x11-2.0.so Unable to load gdk_x11_window_set_user_time from libgdk-x11-2.0.so Unable to load libgtk-x11-2.0.so Unable to load gtk_accel_group_new from libgtk-x11-2.0.so Unable to load gtk_accelerator_get_default_mod_mask from libgtk-x11-2.0.so Unable to load gtk_box_get_type from libgtk-x11-2.0.so Unable to load gtk_box_pack_start from libgtk-x11-2.0.so Unable to load gtk_check_menu_item_get_type from libgtk-x11-2.0.so Unable to load gtk_check_menu_item_new_with_label from libgtk-x11-2.0.so Unable to load gtk_check_menu_item_set_active from libgtk-x11-2.0.so Unable to load gtk_clipboard_clear from libgtk-x11-2.0.so Unable to load gtk_clipboard_get from libgtk-x11-2.0.so Unable to load gtk_clipboard_set_text from libgtk-x11-2.0.so Unable to load gtk_clipboard_set_with_data from libgtk-x11-2.0.so Unable to load gtk_clipboard_store from libgtk-x11-2.0.so Unable to load gtk_clipboard_wait_for_text from libgtk-x11-2.0.so Unable to load gtk_container_add from libgtk-x11-2.0.so Unable to load gtk_container_get_children from libgtk-x11-2.0.so Unable to load gtk_container_get_type from libgtk-x11-2.0.so Unable to load gtk_container_remove from libgtk-x11-2.0.so Unable to load gtk_dialog_add_button from libgtk-x11-2.0.so Unable to load gtk_dialog_get_type from libgtk-x11-2.0.so Unable to load gtk_dialog_run from libgtk-x11-2.0.so Unable to load gtk_dialog_set_default_response from libgtk-x11-2.0.so Unable to load gtk_drag_dest_set from libgtk-x11-2.0.so Unable to load gtk_drag_finish from libgtk-x11-2.0.so Unable to load gtk_file_chooser_add_filter from libgtk-x11-2.0.so Unable to load gtk_file_chooser_dialog_new from libgtk-x11-2.0.so Unable to load gtk_file_chooser_get_filename from libgtk-x11-2.0.so Unable to load gtk_file_chooser_get_files from libgtk-x11-2.0.so Unable to load gtk_file_chooser_get_type from libgtk-x11-2.0.so Unable to load gtk_file_chooser_set_current_folder from libgtk-x11-2.0.so Unable to load gtk_file_chooser_set_current_name from libgtk-x11-2.0.so Unable to load gtk_file_chooser_set_do_overwrite_confirmation from libgtk-x11-2.0.so Unable to load gtk_file_chooser_set_local_only from libgtk-x11-2.0.so Unable to load gtk_file_chooser_set_select_multiple from libgtk-x11-2.0.so Unable to load gtk_file_filter_add_pattern from libgtk-x11-2.0.so Unable to load gtk_file_filter_new from libgtk-x11-2.0.so Unable to load gtk_file_filter_set_name from libgtk-x11-2.0.so Unable to load gtk_get_current_event_time from libgtk-x11-2.0.so Unable to load gtk_im_context_filter_keypress from libgtk-x11-2.0.so Unable to load gtk_im_context_set_client_window from libgtk-x11-2.0.so Unable to load gtk_im_multicontext_new from libgtk-x11-2.0.so Unable to load gtk_init from libgtk-x11-2.0.so Unable to load gtk_main from libgtk-x11-2.0.so Unable to load gtk_main_quit from libgtk-x11-2.0.so Unable to load gtk_menu_attach_to_widget from libgtk-x11-2.0.so Unable to load gtk_menu_bar_new from libgtk-x11-2.0.so Unable to load gtk_menu_get_type from libgtk-x11-2.0.so Unable to load gtk_menu_item_get_label from libgtk-x11-2.0.so Unable to load gtk_menu_item_get_submenu from libgtk-x11-2.0.so Unable to load gtk_menu_item_get_type from libgtk-x11-2.0.so Unable to load gtk_menu_item_new_with_label from libgtk-x11-2.0.so Unable to load gtk_menu_item_set_label from libgtk-x11-2.0.so Unable to load gtk_menu_item_set_submenu from libgtk-x11-2.0.so Unable to load gtk_menu_item_set_use_underline from libgtk-x11-2.0.so Unable to load gtk_menu_new from libgtk-x11-2.0.so Unable to load gtk_menu_popup from libgtk-x11-2.0.so Unable to load gtk_menu_shell_append from libgtk-x11-2.0.so Unable to load gtk_menu_shell_get_type from libgtk-x11-2.0.so Unable to load gtk_message_dialog_new from libgtk-x11-2.0.so Unable to load gtk_message_dialog_new_with_markup from libgtk-x11-2.0.so Unable to load gtk_selection_data_get_uris from libgtk-x11-2.0.so Unable to load gtk_selection_data_set_text from libgtk-x11-2.0.so Unable to load gtk_separator_menu_item_new from libgtk-x11-2.0.so Unable to load gtk_settings_get_default from libgtk-x11-2.0.so Unable to load gtk_show_uri from libgtk-x11-2.0.so Unable to load gtk_vbox_new from libgtk-x11-2.0.so Unable to load gtk_widget_add_accelerator from libgtk-x11-2.0.so Unable to load gtk_widget_add_events from libgtk-x11-2.0.so Unable to load gtk_widget_destroy from libgtk-x11-2.0.so Unable to load gtk_widget_get_display from libgtk-x11-2.0.so Unable to load gtk_widget_get_parent from libgtk-x11-2.0.so Unable to load gtk_widget_get_screen from libgtk-x11-2.0.so Unable to load gtk_widget_get_type from libgtk-x11-2.0.so Unable to load gtk_widget_get_window from libgtk-x11-2.0.so Unable to load gtk_widget_grab_focus from libgtk-x11-2.0.so Unable to load gtk_widget_hide from libgtk-x11-2.0.so Unable to load gtk_widget_remove_accelerator from libgtk-x11-2.0.so Unable to load gtk_widget_set_app_paintable from libgtk-x11-2.0.so Unable to load gtk_widget_set_colormap from libgtk-x11-2.0.so Unable to load gtk_widget_set_double_buffered from libgtk-x11-2.0.so Unable to load gtk_widget_set_sensitive from libgtk-x11-2.0.so Unable to load gtk_widget_show from libgtk-x11-2.0.so Unable to load gtk_widget_show_all from libgtk-x11-2.0.so Unable to load gtk_window_add_accel_group from libgtk-x11-2.0.so Unable to load gtk_window_fullscreen from libgtk-x11-2.0.so Unable to load gtk_window_get_type from libgtk-x11-2.0.so Unable to load gtk_window_iconify from libgtk-x11-2.0.so Unable to load gtk_window_maximize from libgtk-x11-2.0.so Unable to load gtk_window_move from libgtk-x11-2.0.so Unable to load gtk_window_new from libgtk-x11-2.0.so Unable to load gtk_window_present_with_time from libgtk-x11-2.0.so Unable to load gtk_window_remove_accel_group from libgtk-x11-2.0.so Unable to load gtk_window_resize from libgtk-x11-2.0.so Unable to load gtk_window_set_default_icon_list from libgtk-x11-2.0.so Unable to load gtk_window_set_default_size from libgtk-x11-2.0.so Unable to load gtk_window_set_keep_above from libgtk-x11-2.0.so Unable to load gtk_window_set_modal from libgtk-x11-2.0.so Unable to load gtk_window_set_position from libgtk-x11-2.0.so Unable to load gtk_window_set_title from libgtk-x11-2.0.so Unable to load gtk_window_set_transient_for from libgtk-x11-2.0.so Unable to load gtk_window_set_type_hint from libgtk-x11-2.0.so Unable to load gtk_window_stick from libgtk-x11-2.0.so Unable to load gtk_window_unfullscreen from libgtk-x11-2.0.so Unable to load cairo_clip from libcairo.so Unable to load cairo_create from libcairo.so Unable to load cairo_destroy from libcairo.so Unable to load cairo_fill from libcairo.so Unable to load cairo_font_options_create from libcairo.so Unable to load cairo_font_options_destroy from libcairo.so Unable to load cairo_font_options_set_antialias from libcairo.so Unable to load cairo_get_source from libcairo.so Unable to load cairo_image_surface_create from libcairo.so Unable to load cairo_image_surface_create_for_data from libcairo.so Unable to load cairo_image_surface_get_data from libcairo.so Unable to load cairo_image_surface_get_format from libcairo.so Unable to load cairo_image_surface_get_height from libcairo.so Unable to load cairo_image_surface_get_stride from libcairo.so Unable to load cairo_image_surface_get_width from libcairo.so Unable to load cairo_line_to from libcairo.so Unable to load cairo_matrix_init_scale from libcairo.so Unable to load cairo_matrix_init_translate from libcairo.so Unable to load cairo_matrix_translate from libcairo.so Unable to load cairo_move_to from libcairo.so Unable to load cairo_paint_with_alpha from libcairo.so Unable to load cairo_pattern_set_extend from libcairo.so Unable to load cairo_pattern_set_matrix from libcairo.so Unable to load cairo_rectangle from libcairo.so Unable to load cairo_reset_clip from libcairo.so Unable to load cairo_restore from libcairo.so Unable to load cairo_save from libcairo.so Unable to load cairo_set_line_width from libcairo.so Unable to load cairo_set_operator from libcairo.so Unable to load cairo_set_source_rgb from libcairo.so Unable to load cairo_set_source_rgba from libcairo.so Unable to load cairo_set_source_surface from libcairo.so Unable to load cairo_stroke from libcairo.so Unable to load cairo_surface_destroy from libcairo.so Unable to load cairo_surface_flush from libcairo.so Unable to load cairo_translate from libcairo.so Unable to load cairo_scale from libcairo.so Unable to load pango_font_description_free from libpango-1.0.so Unable to load pango_font_description_new from libpango-1.0.so Unable to load pango_font_description_set_family from libpango-1.0.so Unable to load pango_font_description_set_size from libpango-1.0.so Unable to load pango_font_description_set_style from libpango-1.0.so Unable to load pango_font_description_set_weight from libpango-1.0.so Unable to load pango_font_get_metrics from libpango-1.0.so Unable to load pango_font_map_load_font from libpango-1.0.so Unable to load pango_font_metrics_get_ascent from libpango-1.0.so Unable to load pango_font_metrics_get_descent from libpango-1.0.so Unable to load pango_font_metrics_unref from libpango-1.0.so Unable to load pango_language_get_default from libpango-1.0.so Unable to load pango_layout_get_context from libpango-1.0.so Unable to load pango_layout_get_pixel_extents from libpango-1.0.so Unable to load pango_layout_set_font_description from libpango-1.0.so Unable to load pango_layout_set_text from libpango-1.0.so Unable to load pango_cairo_context_set_font_options from libpangocairo-1.0.so Unable to load pango_cairo_create_layout from libpangocairo-1.0.so Unable to load pango_font_map_create_context from libpangocairo-1.0.so Unable to load pango_cairo_font_map_get_default from libpangocairo-1.0.so Unable to load pango_cairo_show_layout from libpangocairo-1.0.so Unable to load pango_cairo_update_layout from libpangocairo-1.0.so Unable to load all required GTK functions Unable to init px Any solutions? Thanks!

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• Configuration of Sonicwall Load Balancing

  - by jacke672

  We installed a Sonicwall NSA 240 appliance and have configured it up for our SSL VPN connection and for load balancing with 2 ADSL lines. Over the past week, I have been testing the load balancing options to optimize the connection speeds for our users - but I've run into the following: Round Robin load balancing is the ideal load balancing setting and it's roughly doubling our throughput- but, when it's active users are unable to access any SSL enabled websites such as banking, web-mail, etc. For this reason, I have been using percentage based balancing as it allows me to enable source and destination IP binding, which doesn't 'break' any secure connections but were left with the slow connection speeds we had before adding the second line. I'm looking for a method in which we can take advantage of the round robin connection speeds while allowing users to access sites with SSL certificates, all while still allowing our remote (vpn) users to connect. Any help would be appreciated. Thanks

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• Balancing internal services using a Cisco CSS 11501

  - by Ladadadada

  First, the background to the problem: I have a Cisco CSS11501 that I am using to load balance a few web servers. These web servers have two network interfaces, one internal and one external and we are sending the requests to the internal interface. We have the CSS configured to do NAT because our webservers need to see the client's IP address. Because the TCP packets hit the webservers with a source address on the Internet, the webserver tries to send the packet back to the client over the external interface and not through the load balancer. In order to stop these requests being sent back out to the Internet via the external interface, we added a routing rule on these boxes so that all traffic with a source address on the internet will use the load balancer as the gateway. This part works fine. What I would also like to to is use the CSS as a load balancer for internal services such as our MySQL slaves. When I do this, I run into a similar problem; the TCP connection goes from the web server to the load balancer and then from the load balancer to the MySQL slave but the CSS spoofs a source address of the original webserver. The MySQL slave then tries to send the response directly to the webserver via the internal network and not via the load balancer. The ideal solution would be to tell the CSS not to do source address spoofing on the internal network and only do it for requests originating on the Internet. Is this possible ? Failing that, is there a way of directing the load balanced traffic back through the load balancer while keeping the other traffic (say SSH) purely on the internal network ? Is there another way of using the CSS11501 to load balance internal services ?

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• Load Balancing of PHP/MYSQL script without big code changes

  - by DR.GEWA

  Sorry for my Dummy Question, but... I am making a script on php/mysql (codeigniter) and I am extremally interested in knowing if there is a way without big architectural changes of the script make a load balancing. I mean, that for example now I will rent a medium dedicated server with 2GB ram, 200GB memory and good processor, and this will be enough lets say half year for the users which will come. But when they will become more and more, and as its a social net and at nights the server is waiting to have 500-1500 or 5000-8000 users online, I wander if there is a way for lets say just add second server with some config which will bear next pressure. After again one and so on... ???? <? if($answer=YES) { how(??); } esle{ whatToDo(??); } ?> If there is no way, than maybe you could point to a easiest way of load balancing solution.... I will be extremally thanksfull if you can tell me for such purposes , should I move lets say to PostgreSQl or FireBird? Which of them will be more easy in the future to handle ? I am getting on the mysite.com/users/show/$userId page something like 60queries for all data... maybe too much, but anyway....after some optimization it can be 20-30....

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• Load balancing and HTTPS strategies

  - by Dan

  I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all clients appear with same IP to our load balancer. I think we are using some hardware load balancing device (can investigate further if necessary). We need to maintain session affinity (site is constructed in ASP), so all requests with same IP get routed to the same node. Since all the communication goes over the HTTPS, no request data (like session Id) is available to balancer as a client discriminator. Is there a way to use some other data besides the IP to distinguish between clients and route the clients even when coming from same IP to different nodes? Note: I need to maintain the traffic between the balancer and nodes safe (encrypted).

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• Opensource Dns based incoming Load balancing ?

  - by sahil

  Hi, I am using Linkproof device for incoming load balancing based on which is based on dns. For example my linkprrof have 3 isp link.... it also act as a dns sevrer for my sites...so when someone connect me by using my dns name my linkprrof give them ip from 3 isp which ever is responding fast. so is there any same kind of open source solution for dns based incoming load balance is possible ??? sahil

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• DNS servers and load balancing

  - by RadiantHex

  Hi there! I'm wondering if a simple DNS server could offer, even a limited amount, of load balancing capability. I have a couple of servers and I've been told that multiple IPAddresses can be associated with one domain. Help would be very much appreciated!

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• Nginx load balancing policy

  - by Alex

  Is the Nginx's load balancing policy customizable in any way? Having two sites A and B I want 20% of all the requests to go to A and the rest to B. Is that possible/feasible? Is there a better solution out there for this task? Thanks, Alex

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• Load balancing application servers with Alteon 2424-SSL

  - by antispam

  We are having problems with load balancing configuration and we would like to clear the situation. We need to load balance among four JavaEE web application servers. The servers are configured as host1 port 7001 host1 port 7002 host2 port 7001 host2 port 7002 Do any of you know if it is possible with Nortel 2424-SSL application switch? Which would be the best configuration for it? (vips, ports, groups, services, ...) Thank you very much.

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• Cisco Catalyst 3550 + Alteon 184 Load-Balancing Issues...

  - by upkels

  I have just deployed a couple Cisco Catalyst 3550 switches, and a couple Alteon 184 Web Switches for load-balancing. I can ping all RIPs and VIPs to/from the Alteon. Topology Before: (server) <- (Alteon) <- (Internet) Topology Now: (server) <- (3550) <- Alteon <- (Internet) Cisco Port Configuration (Alteon Uplink Port): description LB_1_PORT_9_PRIMARY switchport access vlan 10 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 9 Configuration (VLAN 10 WAN): >> Main# /c/port 9/cur Current Port 9 configuration: enabled pref fast, backup gig, PVID 10, BW Contract 1024 name UPLINK >> Main# /c/port 9/fast/cur Current Port 9 Fast link configuration: speed 100, mode full duplex, fctl none, auto off Cisco Configuration (Load-Balanced Servers Port): description LB_1_PORT_1_PRIMARY switchport access vlan 30 switchport mode access switchport nonegotiate speed 100 duplex full Alteon Port 1 Configuration (VLAN 30 LOAD-BALANCED LAN): >> Main# /c/port 1/cur Current Port 1 configuration: enabled pref fast, backup gig, PVID 30, BW Contract 1024 name LB_PORT_1 >> Main# /c/port 1/fast/cur Current Port 1 Fast link configuration: speed 100, mode full duplex, fctl both, auto on Each of my servers are on vlan 10 and 30, properly communicating. I have tried to turn on VLAN tagging on the Alteon, however it seems to cause all communications to stop working. When I tcpdump -i vlan30 on any of the webservers, I see normal ARP communications, and some STP communications, which may or may not be part of the problem: ... 15:00:51.035882 STP 802.1d, Config, Flags [none], bridge-id 801e.00:11:5c:62:fe:80.8041, length 42 15:00:51.493154 IP 10.1.1.254.33923 > 10.1.1.1.http: Flags [S], seq 707324510, win 8760, options [mss 1460], length 0 15:00:51.493336 IP 10.1.1.1.http > 10.1.1.254.33923: Flags [S.], seq 3981707623, ack 707324511, win 65535, options [mss 1460], len gth 0 15:00:51.493778 ARP, Request who-has 10.1.3.1 tell 10.1.3.254, length 46 etc... I'm not sure if I've provided enough information, so please let me know if any more is necessary. Thank you!

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• Load Balancing a UDP server

  - by Hellfrost

  Hello StackOverflow, I have a udp server, it is a central part in my business process. in order to handle the loads I'm expecting in the production environment I'll probably need 2 or 3 instances of the server. The server is almost entirely stateless, it mostly collects data, and the layer above it knows how to handle the minimal amount of stale data that can arise from the the multiple server instances. My question is, how can I implement load balancing between the servers? I would prefer to distribute the requests as evenly as possible between the servers. I would also would like to have some fidelity, I mean if client X was routed to server y, then I want all of X's subsequent requests to go to server Y, as long as it is sensible and not overloads Y. By the way it is a .NET system... what would you recommend?

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• Debian, 2 NICs load-balancing or agregating with one same gateway

  - by pouney

  Hi, I have one server, with double NICs connected to one switch with the same gateway. Behind the switch we have internet. |Debian| - eth0 - switch - internet - eth1 - same I don't understand how to load-balancing between eth0 and eth1. The inbound/outbound traffic always use eth1. This is the config: # The primary network interface allow-hotplug eth0 auto eth0 iface eth0 inet static address 192.168.248.82 netmask 255.255.255.240 network 192.168.248.80 broadcast 192.168.248.95 gateway 192.168.248.81 allow-hotplug eth1 auto eth1 iface eth1 inet static address 192.168.248.83 netmask 255.255.255.240 network 192.168.248.80 broadcast 192.168.248.95 gateway 192.168.248.81 Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.248.80 0.0.0.0 255.255.255.240 U 0 0 0 eth1 192.168.248.80 0.0.0.0 255.255.255.240 U 0 0 0 eth0 0.0.0.0 192.168.248.81 0.0.0.0 UG 0 0 0 eth1 0.0.0.0 192.168.248.81 0.0.0.0 UG 0 0 0 eth0 Ips aren't real, it's just for the example. Anybody have an idea on correct routing to use eth0 on 192.168.248.82 and eth1 on 192.168.248.83 ? I have many example for multiple gateway but here it's the same. Thanks all. Regards

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• DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

  - by user1089770

  I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing (round-robin, but NOT load-balancing). Many people say that “Load Balancing” but I think there will be no load-balancing because “Balance” means (literally) “compare two(or more) and adjust” (and that is what Real s/w or h/w Load balancers do) but Browsers never do this, instead they randomly select and IP and connect to it. It doesn't have any knowledge about the current load of that server (probably, the IP it picked had the highest load!). Automatic failover (latest browsers only). Yes, I think DNS can be used as a simple failover system (at least in 2012, I dont know when it actually "came in effect"). please refer to : http://webmasters.stackexchange.com/questions/10927/using-multiple-a-records-for-my-domain-do-web-browsers-ever-try-more-than-one and Browser-based DNS failover using multiple A records and http://www.nber.org/sys-admin/dns-failover.html I would like to make sure my assumptions/findings are right. So let me know please.....

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• Load Sharing Regarding Large Websites

  - by JHarley1

  Hello, I have a question regarding Load Sharing for large websites. My Understanding: So if you have a website that has millions of fits a day you will need to have an architecture that can support this sort of pressure. You can either do one or two things: Invest in a single large server that has huge amounts of processing power, memory and storage (such as Microsoft's TerraServer). Spread the load of your website across a number of machines. Let me tackle the second approach, so you have a collection of machines all running Web Server Software and all having access to identical copies of the websites pages. You can either spread the load across these machines using a cyclic pattern in a DNS or you can use a Load Ballancing Switch. The advantages of this approach is: - Redundancy - servers can fail and the others would "pick up the slack" - Incremental - the ability to easily add new machines to this set-up. My Question's Is there a Virtual approach to this issue of load balancing now? If the website runs from a database - is there still only a single copy of the database? If a user had a session running on one Server (e.g. they had gone to www.example.org and had been assigned to Server 2 - were they had created a session) if they refreshed the website (and were allocated Server 3) would they still have their session? What are the other disadvantages associated with Load Balancing? Many Thanks, J

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• Ajax-based data loading using jQuery.load() function in ASP.NET

  - by hajan

  In general, jQuery has made Ajax very easy by providing low-level interface, shorthand methods and helper functions, which all gives us great features of handling Ajax requests in our ASP.NET Webs. The simplest way to load data from the server and place the returned HTML in browser is to use the jQuery.load() function. The very firs time when I started playing with this function, I didn't believe it will work that much easy. What you can do with this method is simply call given url as parameter to the load function and display the content in the selector after which this function is chained. So, to clear up this, let me give you one very simple example: $("#result").load("AjaxPages/Page.html"); As you can see from the above image, after clicking the ‘Load Content’ button which fires the above code, we are making Ajax Get and the Response is the entire page HTML. So, rather than using (old) iframes, you can now use this method to load other html pages inside the page from where the script with load function is called. This method is equivalent to the jQuery Ajax Get method $.get(url, data, function () { }) only that the $.load() is method rather than global function and has an implicit callback function. To provide callback to your load, you can simply add function as second parameter, see example: $("#result").load("AjaxPages/Page.html", function () { alert("Page.html has been loaded successfully!") }); Since load is part of the chain which is follower of the given jQuery Selector where the content should be loaded, it means that the $.load() function won't execute if there is no such selector found within the DOM. Another interesting thing to mention, and maybe you've asked yourself is how we know if GET or POST method type is executed? It's simple, if we provide 'data' as second parameter to the load function, then POST is used, otherwise GET is assumed. POST $("#result").load("AjaxPages/Page.html", { "name": "hajan" }, function () { ////callback function implementation });   GET $("#result").load("AjaxPages/Page.html", function () { ////callback function implementation });   Another important feature that $.load() has ($.get() does not) is loading page fragments. Using jQuery's selector capability, you can do this: $("#result").load("AjaxPages/Page.html #resultTable"); In our Page.html, the content now is: So, after the call, only the table with id resultTable will load in our page.   As you can see, we have loaded only the table with id resultTable (1) inside div with id result (2). This is great feature since we won't need to filter the returned HTML content again in our callback function on the master page from where we have called $.load() function. Besides the fact that you can simply call static HTML pages, you can also use this function to load dynamic ASPX pages or ASP.NET ASHX Handlers . Lets say we have another page (ASPX) in our AjaxPages folder with name GetProducts.aspx. This page has repeater control (or anything you want to bind dynamic server-side content) that displays set of data in it. Now, I want to filter the data in the repeater based on the Query String parameter provided when calling that page. For example, if I call the page using GetProducts.aspx?category=computers, it will load only computers… so, this will filter the products automatically by given category. The example ASPX code of GetProducts.aspx page is: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GetProducts.aspx.cs" Inherits="WebApplication1.AjaxPages.GetProducts" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <table id="tableProducts"> <asp:Repeater ID="rptProducts" runat="server"> <HeaderTemplate> <tr> <th>Product</th> <th>Price</th> <th>Category</th> </tr> </HeaderTemplate> <ItemTemplate> <tr> <td> <%# Eval("ProductName")%> </td> <td> <%# Eval("Price") %> </td> <td> <%# Eval("Category") %> </td> </tr> </ItemTemplate> </asp:Repeater> </ul> </div> </form> </body> </html> The C# code-behind sample code is: public partial class GetProducts : System.Web.UI.Page { public List<Product> products; protected override void OnInit(EventArgs e) { LoadSampleProductsData(); //load sample data base.OnInit(e); } protected void Page_Load(object sender, EventArgs e) { if (Request.QueryString.Count > 0) { if (!string.IsNullOrEmpty(Request.QueryString["category"])) { string category = Request.QueryString["category"]; //get query string into string variable //filter products sample data by category using LINQ //and add the collection as data source to the repeater rptProducts.DataSource = products.Where(x => x.Category == category); rptProducts.DataBind(); //bind repeater } } } //load sample data method public void LoadSampleProductsData() { products = new List<Product>(); products.Add(new Product() { Category = "computers", Price = 200, ProductName = "Dell PC" }); products.Add(new Product() { Category = "shoes", Price = 90, ProductName = "Nike" }); products.Add(new Product() { Category = "shoes", Price = 66, ProductName = "Adidas" }); products.Add(new Product() { Category = "computers", Price = 210, ProductName = "HP PC" }); products.Add(new Product() { Category = "shoes", Price = 85, ProductName = "Puma" }); } } //sample Product class public class Product { public string ProductName { get; set; } public decimal Price { get; set; } public string Category { get; set; } } Mainly, I just have sample data loading function, Product class and depending of the query string, I am filtering the products list using LINQ Where statement. If we run this page without query string, it will show no data. If we call the page with category query string, it will filter automatically. Example: /AjaxPages/GetProducts.aspx?category=shoes The result will be: or if we use category=computers, like this /AjaxPages/GetProducts.aspx?category=computers, the result will be: So, now using jQuery.load() function, we can call this page with provided query string parameter and load appropriate content… The ASPX code in our Default.aspx page, which will call the AjaxPages/GetProducts.aspx page using jQuery.load() function is: <asp:RadioButtonList ID="rblProductCategory" runat="server"> <asp:ListItem Text="Shoes" Value="shoes" Selected="True" /> <asp:ListItem Text="Computers" Value="computers" /> </asp:RadioButtonList> <asp:Button ID="btnLoadProducts" runat="server" Text="Load Products" /> <!-- Here we will load the products, based on the radio button selection--> <div id="products"></div> </form> The jQuery code: $("#<%= btnLoadProducts.ClientID %>").click(function (event) { event.preventDefault(); //preventing button's default behavior var selectedRadioButton = $("#<%= rblProductCategory.ClientID %> input:checked").val(); //call GetProducts.aspx with the category query string for the selected category in radio button list //filter and get only the #tableProducts content inside #products div $("#products").load("AjaxPages/GetProducts.aspx?category=" + selectedRadioButton + " #tableProducts"); }); The end result: You can download the code sample from here. You can read more about jQuery.load() function here. I hope this was useful blog post for you. Please do let me know your feedback. Best Regards, Hajan

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• Windows/.NET Load Distribution & Balancing

  - by andrewbadera

  Hi all, Is there a vetted Windows-friendly, or even .NET-native, load-distributing/load-balancing utility out there along the lines of HA Proxy? We have a .NET stack product, and the one piece that we step out of the stack is for load-balancing. We need something with configurable rules for distribution -- perhaps subdomain-driven -- that NLB alone doesn't seem to offer. If it integrates directly with .NET, or offers an exposed API callable by webservices, so much the better! Thanks in advance! Clarification: we need to logically part over boxes. This is not just a cluster/failover/replication scenario.

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• Create CRM Organizations on Load Balancing network

  - by user82613

  I'm trying to understand how to create CRM Organization on Load Balancing network. I've three web servers (Web01, Web 02, Web03); three application servers (App01, App02, App03) and a SQL Server (SQL01). I already have Load Balancer setup and there is already one organizaiton setup by someone on all web servers. This organization is Internet Facing. Now I want to create one more Organization on same set of Web Servers. Can anyone please help me understand how to setup new Organization on Load Balancer in this scenario?

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• Load balancing without a load balancer?

  - by Tom

  I have 4 nginx-powered image servers on their own subdomains which users would access at random. I decided to put them all behind a HAProxy load balancer to improve the reliability and to see the traffic statistics from a single location. It seemed like a no-brainer. Unfortunately, the move was a complete failure as the load balancer's 100mbit port was completely saturated with all requests now going through it. I was wondering what to do about this - I could get a port upgrade ($$) or return to 4 separate image servers that are randomly accessed. I thought about putting HAProxy on each image server which would in turn route to another image server if that server's nginx service was having trouble. What would you do? I would like to not have to spend too much additional money.

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• DNS servers and load balancing

  - by RadiantHex

  Hi there! I'm wondering if a simple DNS server could offer, even a limited amount, of load balancing capability. I have a couple of servers and I've been told that multiple IPAddresses can be associated with one domain. Help would be very much appreciated!

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• Elastic Load Balancing in EC2

  - by Dom

  Hi Its been on the cards for a while, but now that Amazon have released Elastic Load balancing what are your thoughts on deploying this solution for a high-traffic web app. Should we replace HAProxy or consider ELB as a complimentary service in front of HAProxy Appreciate any comments or suggestions Thanks Dom

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• Simplify your Ajax code by using jQuery Global Ajax Handlers and ajaxSetup low-level interface

  - by hajan

  Creating web applications with consistent layout and user interface is very important for your users. In several ASP.NET projects I’ve completed lately, I’ve been using a lot jQuery and jQuery Ajax to achieve rich user experience and seamless interaction between the client and the server. In almost all of them, I took advantage of the nice jQuery global ajax handlers and jQuery ajax functions. Let’s say you build web application which mainly interacts using Ajax post and get to accomplish various operations. As you may already know, you can easily perform Ajax operations using jQuery Ajax low-level method or jQuery $.get, $.post, etc. Simple get example: $.get("/Home/GetData", function (d) { alert(d); }); As you can see, this is the simplest possible way to make Ajax call. What it does in behind is constructing low-level Ajax call by specifying all necessary information for the request, filling with default information set for the required properties such as data type, content type, etc... If you want to have some more control over what is happening with your Ajax Request, you can easily take advantage of the global ajax handlers. In order to register global ajax handlers, jQuery API provides you set of global Ajax methods. You can find all the methods in the following link http://api.jquery.com/category/ajax/global-ajax-event-handlers/, and these are: ajaxComplete ajaxError ajaxSend ajaxStart ajaxStop ajaxSuccess And the low-level ajax interfaces http://api.jquery.com/category/ajax/low-level-interface/: ajax ajaxPrefilter ajaxSetup For global settings, I usually use ajaxSetup combining it with the ajax event handlers. $.ajaxSetup is very good to help you set default values that you will use in all of your future Ajax Requests, so that you won’t need to repeat the same properties all the time unless you want to override the default settings. Mainly, I am using global ajaxSetup function similarly to the following way: $.ajaxSetup({ cache: false, error: function (x, e) { if (x.status == 550) alert("550 Error Message"); else if (x.status == "403") alert("403. Not Authorized"); else if (x.status == "500") alert("500. Internal Server Error"); else alert("Error..."); }, success: function (x) { //do something global on success... } }); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Now, you can make ajax call using low-level $.ajax interface and you don’t need to worry about specifying any of the properties we’ve set in the $.ajaxSetup function. So, you can create your own ways to handle various situations when your Ajax requests are occurring. Sometimes, some of your Ajax Requests may take much longer than expected… So, in order to make user friendly UI that will show some progress bar or animated image that something is happening in behind, you can combine ajaxStart and ajaxStop methods to do the same. First of all, add one <div id=”loading” style=”display:none;”> <img src="@Url.Content("~/Content/images/ajax-loader.gif")" alt="Ajax Loader" /></div> anywhere on your Master Layout / Master page (you can download nice ajax loading images from http://ajaxload.info/). Then, add the following two handlers: $(document).ajaxStart(function () { $("#loading").attr("style", "position:absolute; z-index: 1000; top: 0px; "+ "left:0px; text-align: center; display:none; background-color: #ddd; "+ "height: 100%; width: 100%; /* These three lines are for transparency "+ "in all browsers. */-ms-filter:\"progid:DXImageTransform.Microsoft.Alpha(Opacity=50)\";"+ " filter: alpha(opacity=50); opacity:.5;"); $("#loading img").attr("style", "position:relative; top:40%; z-index:5;"); $("#loading").show(); }); $(document).ajaxStop(function () { $("#loading").removeAttr("style"); $("#loading img").removeAttr("style"); $("#loading").hide(); }); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Note: While you can reorganize the style in a more reusable way, since these are global Ajax Start/Stop, it is very possible that you won’t use the same style in other places. With this way, you will see that now for any ajax request in your web site or application, you will have the loading image appearing providing better user experience. What I’ve shown is several useful examples on how to simplify your Ajax code by using Global Ajax Handlers and the low-level AjaxSetup function. Of course, you can do a lot more with the other methods as well. Hope this was helpful. Regards, Hajan

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• NGINX load balancer DOS itself

  - by cjaredrun

  I have been running a load balancing machine for a number of months now which has had no problems in the past. I got woken up to some downtime and I am seeing this a lot in syslog: TCP: Possible SYN flooding on port 80. Sending cookies. At which point Nginx takes up 100% of the cpu and doesn't come back down to normal for several minutes. I have it running on Ubuntu currently but I also was able to replicate on Debian 6.

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• Cloud Based Load Testing Using TF Service &amp; VS 2013

  - by Tarun Arora [Microsoft MVP]

  Originally posted on: http://geekswithblogs.net/TarunArora/archive/2013/06/30/cloud-based-load-testing-using-tf-service-amp-vs-2013.aspx One of the new features announced as part of the Visual Studio 2013 Ultimate Preview is ‘Cloud Based Load Testing’. In this blog post I’ll walk you through, What is Cloud Based Load Testing? How have I been using this feature? – Success story! Where can you find more resources on this feature? What is Cloud Based Load Testing? It goes without saying that performance testing your application not only gives you the confidence that the application will work under heavy levels of stress but also gives you the ability to test how scalable the architecture of your application is. It is important to know how much is too much for your application! Working with various clients in the industry I have realized that the biggest barriers in Load Testing & Performance Testing adoption are, High infrastructure and administration cost that comes with this phase of testing Time taken to procure & set up the test infrastructure Finding use for this infrastructure investment after completion of testing Is cloud the answer? 100% Visual Studio Compatible Scalable and Realistic Start testing in < 2 minutes Intuitive Pay only for what you need Use existing on premise tests on cloud There are a lot of vendors out there offering Cloud Based Load Testing, to name a few, Load Storm Soasta Blaze Meter Blitz And others… The question you may want to ask is, why should you go with Microsoft’s Cloud based Load Test offering. If you are a Microsoft shop or already have investments in Microsoft technologies, you’ll see great benefit in the natural integration this offers with existing Microsoft products such as Visual Studio and Windows Azure. For example, your existing Web tests authored in Visual Studio 2010 or Visual Studio 2012 will run on the cloud without requiring any modifications what so ever. Microsoft’s cloud test rig also supports API based testing, for example, if you are building a WPF application which consumes WCF services, you can write unit tests to invoke the WCF service, these tests can be run on the cloud test rig and loaded with ‘N’ concurrent users for performance testing. If you have your assets already hosted in the Azure and possibly in the same data centre as the Cloud test rig, your Azure app will not incur a usage cost because of the generated traffic since the traffic is coming from the same data centre. The licensing or pricing information on Microsoft’s cloud based Load test service is yet to be announced, but I would expect this to be priced attractively to match the market competition.   The only additional configuration required for running load tests on Microsoft Cloud based Load Tests service is to select the Test run location as Run tests using Visual Studio Team Foundation Service, How have I been using Microsoft’s Cloud based Load Test Service? I have been part of the Microsoft Cloud Based Load Test Service advisory council for the last 7 months. This gave the opportunity to see the product shape up from concept to working solution. I was also the first person outside of Microsoft to try this offering out. This gave me the opportunity to test real world application at various clients using the Microsoft Load Test Service and provide real world feedback to the Microsoft product team. One of the most recent systems I tested using the Load Test Service has been an insurance quote generation engine. This insurance quote generation engine is,   hosted in Windows Azure expected to get quote requests from across the globe expected to handle 5 Million quote requests in a day (not clear how this load will be distributed across the day) There was no way, I could simulate such kind of load from on premise without standing up additional hardware. But Microsoft’s Cloud based Load Test service allowed me to test my key performance testing scenarios, i.e. Simulate expected Load, Endurance Testing, Threshold Testing and Testing for Latency. Simulating expected load: approach to devising a load pattern My approach to devising a load test pattern has been to run the test scenario with 1 user to figure out the response time. Then work out how many users are required to reach the target load. So, for example, to invoke 1 quote from the quote engine software takes 0.5 seconds. Now if you do the math,   1 quote request by 1 user = 0.5 seconds   quotes generated by 1 user in 24 hour = 1 * (((2 * 60) * 60) * 24) = 172,800   quotes generated by 30 users in 24 hours = 172,800 * 30 =  5,184,000 This was a very simple example, if your application requires more concurrent users to test scenario’s such as caching, etc then you can devise your own load pattern, some examples of load test patterns can be found here.  Endurance Testing To test for endurance, I loaded the quote generation engine with an expected fixed user load and ran the test for very long duration such as over 48 hours and observed the affect of the long running test on the Azure infrastructure. Currently Microsoft Load Test service does not support metrics from the machine under test. I used Azure diagnostics to begin with, but later started using Cerebrata Azure Diagnostics Manager to capture the metrics of the machine under test. Threshold Testing To figure out how much user load the application could cope with before falling on its belly, I opted to step load the quote generation engine by incrementing user load with different variations of incremental user load per minute till the application crashed out and forced an IIS reset. Testing for Latency Currently the Microsoft Load Test service does not support generating geographically distributed load, I however, deployed the insurance quote generation engine in different Azure data centres and ran the same set of performance tests to measure for latency. Because I could compare load test results from different runs by exporting the results to excel (this feature is provided out of the box right from Visual Studio 2010) I could see the different in response times. More resources on Microsoft Cloud based Load Test Service A few important links to get you started, Download Visual Studio Ultimate 2013 Preview Getting started guide for load testing using Team Foundation Service Troubleshooting guide for FAQs and known issues Team Foundation Service forum for questions and support Detailed demo and presentation (link to Tech-Ed session recording) Detailed demo and presentation (link to Build session recording) There a few limits on the usage of Microsoft Cloud based Load Test service that you can read about here. If you have any feedback on Microsoft Cloud based Load Test service, feel free to share it with the product team via the Visual Studio User Voice forum. I hope you found this useful. Thank you for taking the time out and reading this blog post. If you enjoyed the post, remember to subscribe to http://feeds.feedburner.com/TarunArora. Stay tuned!

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• Software load balancing fail-over vs hardware

  - by SmartLemon

  Please correct me, but my understanding is that with software load balancing a service must be run on each server while there is one DS that notifies the other servers that a server has gone down and that they should consume that servers load. With hardware load balancing what happens in a fail-over? Could someone explain? Is there advantages with using hardware load balancing when it comes to fail-over, or is there advantages with software? Or do they both have their pros and cons?

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• Load balancing on Ubuntu Server

  - by SabreWolfy

  I have Ubuntu 10.04.4 server (32-bit) installed on a headless quad-core machine with 2GB RAM. I'm running a command-line analysis which is analyzing a large amount of data, but which does not require a large amount of RAM. The tool does not provide any multi-threading, so the CPU load is sitting at 1.00 (or sometimes just a little over). I ran top and pressed 1 to see the load on each of the cores and noticed that "Cpu1" is always running at 100%. I thought that the load would be distributed between the cores, rather than loading one core all the time. I'm sure I've seen this load-balancing behaviour before in Ubuntu or Debian Desktop versions. Why would the Server edition work differently? The analysis will likely take several hours to run, so loading one core at 100% for many hours while the other 3 remain idle is surely not the best approach?

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