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  • How to find an alternative proxy server

    - by Stan
    It appears the default ISP proxy has some problem and got high latency. How to find a good alternative proxy at my location? Say google's proxy? I tried to search online (keyword: proxy mylocation), but couldn't tell which is trustworthy. Thanks.

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  • How to find an alternative proxy server

    - by Stan
    It appears the default ISP proxy has some problem and got high latency. How to find a good alternative proxy at my location? Say google's proxy? I tried to search online (keyword: proxy mylocation), but couldn't tell which is trustworthy. Thanks.

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  • SSH tunneling hangs with many connections

    - by middleofdreams
    I am forced to use SSH tunneling to access many servers (over 100) via one gateway server. To keep connection alive I am using autossh. Everything works pretty well until there is high traffic (people are connecting to most of the servers at once). then ssh process reaches 12% of cpu (which is configured maximum for separate process) and no connection is working anymore - i have to restart autossh script. What could be the possible reason for that?

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  • Linux server became extremely slow

    - by Ariel Aharonson
    I have a file sharing website, and my files hosted in a server with those system specifications: 32GB RAM 12x3TB 2x Intel Quad Core E5620 I have files in this server up to 4gb for each file. 446gb is full (/36TB) [root@hosted-by ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 50G 2.7G 44G 6% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 97M 57M 36M 62% /boot /dev/mapper/VolGroup01-LogVol00 33T 494G 33T 2% /home And take a look at this: Why is the wa% so high? (I think that what makes the server to be so slow)

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  • Drupal on an NFS share has terrible performance

    - by Marcus
    We have a setup where a Drupal 7 site with the following setup - a VMware ESXi 4.1 host server running a web vm and an NFS VM. The web VM is using Apache and mod_php. The site is still in development thus we have to turn off all forms of caching due to the frequently-updated files. Each page request takes around 15-20 seconds to complete. Profiling the PHP code shows that the vast majority of time (normally over 90%) is taking by all the is_dir(), is_file() function calls that load up the modules. I've increased PHP's realpath cache size to several megs and an strace shows that the lstat calls then drop from over 200 to around 6 and stat() decreases a bit (around 600 calls). However, while this has shaved off quite a bit of time, I am simply unable to break past the 10 second per request barrier. Is there a way to get better performance out of this setup that doesn't involve caching? Configs and stats: VMs: web - Centos 6 64bt, 2.5GB RAM, normal CPU/HD prioritisation nfs - Centos 6 64bt, 2GB RAM, normal CPU priority, high HD priority PHP: 32M realpath cache size (it's this high for testing purposes) NFS: ~]# egrep -v '#|^$' /etc/nfsmount.conf [ NFSMount_Global_Options ] Defaultvers=4 Ac=False Rsize=32k Wsize=32k Bsize=32k Reading speeds via NFS are not an issue a dd of a 100M test file using 32k blocks returns: 3200+0 records in 3200+0 records out 104857600 bytes (105 MB) copied, 1.84984 s, 56.7 MB/s real 0m1.857s user 0m0.007s sys 0m0.330s Strace on Apache process with empty realpath cache: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 50.78 1.157452 337 3434 28 stat 32.58 0.742656 628 1182 425 open 9.29 0.211788 762 278 1 lstat 3.17 0.072322 0 237865 write 2.45 0.055839 490 114 13 access 0.45 0.010262 43 237 brk 0.34 0.007725 10 811 74 read 0.28 0.006340 9 679 fstat 0.22 0.005069 18 281 poll 0.20 0.004533 6 698 getdents 0.09 0.001960 10 190 mmap 0.05 0.001065 14 74 accept4 0.04 0.001000 333 3 chdir 0.03 0.000750 4 190 munmap 0.01 0.000339 0 836 close 0.01 0.000247 3 75 writev 0.00 0.000068 0 611 fcntl 0.00 0.000063 1 77 shutdown 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 5 socket 0.00 0.000000 0 5 5 connect 0.00 0.000000 0 74 getsockname 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 1 futex ------ ----------- ----------- --------- --------- ---------------- Strace after realpaths are cached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 60.14 1.371006 484 2831 28 stat 31.79 0.724705 627 1155 425 open 3.53 0.080354 0 237865 write 2.65 0.060433 530 114 13 access 0.43 0.009913 99 100 brk 0.38 0.008730 11 804 74 read 0.35 0.007910 12 675 fstat 0.30 0.006775 10 654 getdents 0.13 0.003065 11 281 poll 0.09 0.002000 333 6 1 lstat 0.07 0.001545 2 807 close 0.05 0.001063 14 74 accept4 0.04 0.001000 6 179 mmap 0.02 0.000404 2 179 munmap 0.01 0.000271 4 75 writev 0.01 0.000212 0 611 fcntl 0.01 0.000129 2 77 shutdown 0.00 0.000022 0 74 getsockname 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 3 socket 0.00 0.000000 0 3 3 connect 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 3 chdir ------ ----------- ----------- --------- --------- ---------------- Mount: nfs.xxx.xxx.xxx:/path/to/website/files on /path/to/website/files type nfs (rw,hard,intr,noac,vers=4,addr=xx.xx.xx.xx,clientaddr=xx.xx.xx.xx) Any help is, naturally, appreciated.

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  • Internet Explorer cannot display page from apache with single SSL virtual host

    - by P.scheit
    I have a question that has come up somehow in different questions but I still can't find the solution, yet. My problem is that I'm hosting a site on apache 2.4 on debian with SSL and Internet Explorer 7 on windows xp shows Internet Explorer cannot display the webpage I have only ONE virtual host that uses ssl, but DIFFERENT virtual hosts that use http. Here is my config for the site with SSL enabled (etc/sites-avaible/default-ssl is NOT linked) <Virtualhost xx.yyy.86.193:443> ServerName www.my-certified-domain.de ServerAlias my-certified-domain.de DocumentRoot "/var/local/www/my-certified-domain.de/current/www" Alias /files "/var/local/www/my-certified-domain.de/current/files" CustomLog /var/log/apache2/access.my-certified-domain.de.log combined <Directory "/var/local/www/my-certified-domain.de/current/www"> AllowOverride All </Directory> SSLEngine on SSLCertificateFile /etc/ssl/certs/www.my-certified-domain.de.crt SSLCertificateKeyFile /etc/ssl/private/www.my-certified-domain.de.key SSLCipherSuite HIGH:MEDIUM:!aNULL:+SHA1:+MD5:+HIGH:+MEDIUM SSLCertificateChainFile /etc/apache2/ssl.crt/www.my-certified-domain.de.ca BrowserMatch "MSIE [2-8]" nokeepalive downgrade-1.0 force-response-1.0 </VirtualHost> <VirtualHost *:80> ServerName www.my-certified-domain.de ServerAlias my-certified-domain.de CustomLog /var/log/apache2/access.my-certified-domain.de.log combined Redirect permanent / https://www.my-certified-domain.de/ </VirtualHost> my ports.conf looks like this: NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to <VirtualHost *:443> # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> the output from apache2ctl -S is like this: xx.yyy.86.193:443 www.my-certified-domain.de (/etc/apache2/sites-enabled/020-my-certified-domain.de:1) wildcard NameVirtualHosts and _default_ servers: *:80 is a NameVirtualHost default server phpmyadmin.my-certified-domain.de (/etc/apache2/conf.d/phpmyadmin.conf:3) port 80 namevhost phpmyadmin.my-certified-domain.de (/etc/apache2/conf.d/phpmyadmin.conf:3) port 80 namevhost staging.my-certified-domain.de (/etc/apache2/sites-enabled/010-staging.my-certified-domain.de:1) port 80 namevhost testing.my-certified-domain.de (/etc/apache2/sites-enabled/015-testing.my-certified-domain.de:1) port 80 namevhost www.my-certified-domain.de (/etc/apache2/sites-enabled/020-my-certified-domain.de:31) I included the solution for this question: Internet explorer cannot display the page, other browsers can, possibly htaccess / server error And I understand the answer from this question: How to setup Apache NameVirtualHost on SSL? In fakt: I only have one ssl certificate for the domain. And I only want to run ONE virtual host with ssl. So I just want to use the one ip for the ssl virtual host. But still (after rebooting / restarting / testing) internet explorer will still not show the page. When I intepret the apachectl -S as well, I already have only one SSL host and this should response to the initial SSH handshake, shouldn't it? What is wrong in this setup? Thank you so much Philipp

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  • Which SQL database should I run?

    - by Chris Salij
    I'm creating my first website from hand-coded scratch (just used WordPress and Drupal before) and I'm at the point where I'm setting up my database for the site. However my host has given me 4 options to choose from in the database department. MS SQL Server 2005 MySQL PostgreSQL MySQL 5 Which should I go for? From what I understand PostgreSQL is meant for smaller databases with high access times. Though to be honost I'm not quite sure.

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  • pull bandwidth from wireless WAN into local LAN

    - by cortical
    We have a local network (A) of about 50 computers connected via gigabit ethernet. We get a connection to the internet using two broadband connections to a backbone and distribute the bandwidth across the 50 computers using a CISCO 1811 router, but the bandwidth is not enough for everybody. There is a campus wide wireless network(B) that has very high bandwidth, is there a device or way to setup multiple individual connections to network B and supply the bandwidth to our network A?

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  • How to stream TV/Films/Music over the internet to various devices from a home server?

    - by ritch0s
    Set up: An always on old-ish laptop connected to a NAS which contains TV/Films/Music. I want to be able to stream on the fly the data on my NAS to various connected devices such as iphone or laptop. I am currently using Orb (orb.com) mycast software but the requirements for the streaming are very high in terms of processing power is there alternative software and dedicated hardware i can add to get maximum benefit from this setup?

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  • Faster zlib alternatives

    - by BarsMonster
    I wonder, if there are any faster builds of zlib around with more advanced optimizations? If it's possible to optimize it using SSE instructions or Intel C++ compiller, or some trick which were patented earlier (I know patents were a serious limitation during gzip/zlib development), have anyone bothered to implement that? I am especially interested in compression speed, which have a direct impact on high-performance web-services serving static & dynamic content.

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  • shinken/nagios discriminative between warning alert and critical alert

    - by SWdream
    i using shinken for my monitoring system. Now, i have a problem when i configure shinken notification. My purpose is to discriminative between notification for warning state and critical state of check service: with warning state: + time to send alert from 8h = 18 h everyday, via email and sms + notification_interval is 60 minutes (Re-notify about service problems every hour) with critical state: + time to send alert : all time (24 x 7), via email and sms + notification_interval is 30 minutes Please show me how to solve my problem! I have tried the following: i configured: + contact templates: define contact{ name warning-contact ; The name of this contact template register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL CONTACT, JUST A TEMPLATE! host_notifications_enabled 1 define contact{ service_notifications_enabled 1 email shinken@localhost can_submit_commands 1 notificationways email_warning, sms_warning } define contact{ name critical-contact ; The name of this contact template register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL CONTACT, JUST A TEMPLATE! host_notifications_enabled 1 service_notifications_enabled 1 email shinken@localhost can_submit_commands 1 notificationways email_critical, sms_critical } + time poriod templates: define timeperiod{ timeperiod_name warning alias Normal Work Hours monday 08:00-18:00 tuesday 08:00-18:00 wednesday 08:00-18:00 thursday 08:00-18:00 friday 08:00-18:00 saturday 08:00-18:00 sunday 08:00-18:00 #exclude 24x7 } define timeperiod{ timeperiod_name 24x7 alias 24_Hours_A_Day,_7_Days_A_Week sunday 00:00-24:00 monday 00:00-24:00 tuesday 00:00-24:00 wednesday 00:00-24:00 thursday 00:00-24:00 friday 00:00-24:00 saturday 00:00-24:00 #exclude workhours } + notification way templates: define notificationway{ notificationway_name email_warning service_notification_period warning host_notification_period warning service_notification_options w host_notification_options d,u,r,f,s notification_interval 60 ; Resend notifications every 30 minutes service_notification_commands notify-service-by-email ; send service notifications via email host_notification_commands notify-host-by-email ; send host notifications via email } define notificationway{ notificationway_name email_critical service_notification_period 24x7 host_notification_period 24x7 service_notification_options c,r host_notification_options d,u,r,f,s notification_interval 30 ; Resend notifications every 30 minutes service_notification_commands notify-service-by-email ; send service notifications via email host_notification_commands notify-host-by-email ; send host notifications via email } define notificationway{ notificationway_name sms_warning service_notification_period warning host_notification_period warning service_notification_options w host_notification_options d,u,r,f,s notification_interval 60 ; Resend notifications every 30 minutes service_notification_commands notify-service-by-sms ; send service notifications via sms host_notification_commands notify-host-by-sms ; send host notifications via sms } define notificationway{ notificationway_name sms_critical service_notification_period 24x7 host_notification_period 24x7 service_notification_options c,r host_notification_options d,u,r,f,s notification_interval 30 ; Resend notifications every 30 minutes service_notification_commands notify-service-by-sms ; send service notifications via sms host_notification_commands notify-host-by-sms ; send host notifications via sms } + my contacts define contact{ use warning-contact contact_name thanhwarn email xxxx pager xxxx ; contact phone number } define contact{ use critical-contact contact_name thanhcritical email xxxxx pager 01689xxxx ; contact phone number } + and define service: define service{ use generic-service service_description check_ram host_name graphite contacts thanhcritical, thanhwarn check_command check_nrpe!check_ram } but my shinken system don't send alert. i don't understand this. please show me where I went wrong! thanks all!

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  • How can I turn my server box into an internet modem?

    - by Robbie Mckennie
    I've been trying to learn about networking, network maintenance, network administration, stuff of that nature (I want to be a network engineer when I get out of university after I get out of high school) and I want to set up my older PC (running Slackware) as a modem, as a project to help me learn. I want to know what kind of hardware I'll need. Pretty much all I know is that my current modem uses ADSL2+ and PPPoA, which I think is a software thing anyway. How can I accomplish this?

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  • How to integrate a mirror WS without client reconfiguration?

    - by tzup
    I have a web service hosted by IIS server 1 and another web service hosted by IIS server 2. Is there a way to have the WS on server 2 automatically pick up when the WS on server 1 is unavailable, without having to reconfigure the clients (which are desktop applications in this case). There must be some tools that perform such tasks, please help. Thank you. EDIT The two web services expose the same functionality, so basically I am trying to setup a high-availability cluster (ie failover cluster)

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  • Database Snapshots of Mirrored databases affect performance of Principal database?

    - by yrushka
    I have 2 servers set in Mirroring High-safety. One is Principal and another in Mirror. Currently I have 2 snapshots of a Production database (100 GB size) created on Principal server (for no_lock purpose of massive select processes) and 2 snapshots on the mirror server for the same database for reporting purposes. I know snapshots reduce performance of source databases but I am not sure if snapshots from mirror server have any impact on principal server's performance. thanks,

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  • Linux tools to choose suitable Cisco ASA 5500

    - by linuxcore
    I have a linux webhosting server which affects a high DDOS. I want to use Cisco ASA 5500 Series Adaptive Security Appliances to protect the linux server from this DDOS. I know there are many factors should you know before you choose the suitable hardware firewall like the amount of this DDOS and pps ..etc Please suggest a linux tools to measure those factors and to help me collect the required informations ( pps - amount of DDOS - concurrent connections and other factors ) Regards,

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  • Graphics card artifacting

    - by White Phoenix
    This is my current build: EVGA X58 (first generation) motherboard Intel i7 965 @ stock clocks 3x 2GB DDR3-1600 Corsair RAM at stock timings and voltages Corsair AX750 80 Plus Gold PSU 1 Optical Drive 1 Seagate 7200.10 500 GB drive 2x Western Digital Caviar Black 1 TB drives OCZ Vertex 1 60 GB EVGA GTX 460 Antec 1200 case HT-Omega Striker 7.1 Sound Card Windows 7 32-bit Professional (PAE Enabled) My graphics card started artifacting while I was playing a game. It artifacted, the display blinked, then I got an NVIDIA driver has crashed and recovered message. Kept going, more artifacts, another crash, but this time my display blanked out and I couldn't do anything. Restarted my computer - artifacting is in the BIOS - got to Windows 7 but it BSOD'd before I could even log in. I restarted the computer again - artifacts cleared themselves out and I managed to get to Win7, but it soon started blinking in and out and artifacting again. Checked the card temps and they're well within range. (50 idle, 70 full load) The ambient temperature here is about 80-85F with high humidity. Tried Safe Mode and it still froze up/BSOD'd. Already tried the following to fix this problem: - Reseat the graphics card and swapped in a different slot. - Removed cover on card and sprayed with compressed air to clean it out. - Swapped around memory and/or went with only using one stick at a time. - Underclocked card I called EVGA Tech Support and they said that the voltage on the 12V rail of my Corsair AX750 PSU was on the high end of the "acceptable" range (12.4V, highest within acceptable range is 12.6V - optimal is obviously 12V). They gave me an RMA number anyway, but I want to get a second opinion from you all before I send this thing off, as shipping from where I live to EVGA is kind of pricey. This PSU is only 6 months old. So that I don't have to play RMA tag, which case would be most likely? I'm strapped for cash at the moment so I want to reduce the amount of RMAs I have to do since shipping is expensive here. Is there any surefire way to test to see if it's really the graphics card or the PSU? I tried unplugging any devices that were connected to the 12V rail (except for my SSD and graphics card) as I do have 3 mechanical hard drives, but the voltage for that rail didn't drop (it remained at 12.4V). I'm fairly sure it isn't the drivers since I'm getting the artifacting at the BIOS too. Right now I'm back in Windows 7 but I don't know for how long until it messes up again. Any ideas?

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  • Unable to uninstall SQL 2008 Instance(s)

    - by ichoudhury
    Windows 2008 R2 High Availability Cluster and we were just going through the first phase of configuration. Somebody accidentally loaded the instance incorrectly, so I was hopping to uninstall and reinstall. But when I approach the uninstall process, it fails with the following msg: Object reference not set to an instance of an object SQL instance not yet clustered (FYI) Any idea?

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  • Weird graphics behaviour while playing games

    - by Ayush Khemka
    When I play any high-end game like NFS Most Wanted or FIFA 12, I get these weird things on my graphics. While playing NFS, my car has various transparent diamonds all over its body, and while playing FIFA I get these weird black lines all over the field. My PC specs are :- AMD Athlon II X2 ASUS M4A785D-M PRO 500GB Seagate HDD 2GB DDR2 Transcend RAM 1033Mhz ATI Radeon HD4350 512MB graphics card Tell me if I need to provide anything else. Please help me. Thanks.

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  • Broken pipe on nginx

    - by schneck
    Hi there, I set up php/fastcgi with nginx and now I want to upload very large files via a java-applet. After about 30 seconds, the applet reports a "Broken pipe". In the server logs, i find nothing. I changed any setting in the php.ini (max_execution_time, max_input_time, memory_limit, post_max_size) to very high values, but nothing helps. Any idea?

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  • When running Adobe Acrobat's OCR on a PDF document, which downsampling produces a higher quality: 600 dpi or 72 dpi?

    - by Ricardo Altamirano
    I have a large PDF document that consists of scanned pages of a textbook. I want to run Adobe Acrobat 9's text recognition function on it, but I'm presented with this menu when I do. I'm confused by the options in the highlighted menu. What option will produce the highest quality/most readable text? I thought 600 dpi implies a higher quality image than 72 dpi, so I'm confused by "High (72 dpi)" and "Lowest (600 dpi)."

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