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• SamFS performance problem on file creation

  - by Gregor Longariva

  I have two samfs filesystems (samfs1 and samfs2), both on the same 6130, both with the same config/watermarks/timeouts etc. creating a file on samfs2 works as it should, on samfs1 not. A little simple script shows up, that every while and then the file creation needs between 11 and 28 seconds: stan 12:32 [scratch]# while ( 1 ) while? echo - while? time echo test file while? time mv file file2 while? echo + while? sleep 1 while? end 0.00u 0.00s 0:00.01 0.0% 0.00u 0.00s 0:00.00 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.03 0.0% + 0.00u 0.00s 0:23.71 0.0% 0.00u 0.00s 0:00.14 0.0% + 0.00u 0.00s 0:00.18 0.0% 0.00u 0.00s 0:00.13 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.06 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.04 0.0% + 0.00u 0.00s 0:00.04 0.0% 0.00u 0.00s 0:00.05 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.01 0.0% + 0.00u 0.00s 0:26.05 0.0% 0.00u 0.00s 0:00.50 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.06 0.0% + 0.00u 0.00s 0:00.00 0.0% 0.00u 0.00s 0:00.12 0.0% + Any idea where the problem could be?

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• Adjust output Brightness/Gamma/Colors in Gnome

  - by Mikee

  We have a desktop system running Ubuntu 8.04.4, and it is connected to a standard desktop LCD monitor. Unfortunately, in 8.04.4, the brightness of the image is cranked way up. It appears to be a graphics driver issue. Unfortunately, installing a newer GPU driver for this Intel GPU is very difficult to do. So, I am looking for a software (or config file?) solution to achieve this. Note: Ubuntu 9.10 and higher do not exhibit this issue, so this is not a hardware problem. Note: VNC-ing to this machine from another does not exhibit this issue either. Also, I installed "DisplayCalibrator.app", and it does not work very well (the app comes up, but the contents of the window are blank). Is there anything that I can add to the xorg.conf file to correct this issue? Also, this solution: http://superuser.com/questions/96539/adjust-contrast-and-brightness-in-ubuntu did not resove my issue. Thank you all for the help!

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• Lighttpd mod_accesslog not logging fastcgi requests

  - by zepatou

  I have recently installed a lighttpd for serving a python script via mod_fastcgi. Everything works fine except that I don't get the requests handled by mod_fastcgi logged in the access.log file (requests on port 80 are logged though). My lighttpd version is 1.4.28 on a Debian 6.0. I used the same working configuration a Ubuntu server 10.04 with lighttpd 1.4.26 and it worked. Here is my config lighttpd.conf server.modules = ( "mod_access", "mod_alias", "mod_accesslog", "mod_compress", ) server.document-root = "/var/www/" server.upload-dirs = ( "/var/cache/lighttpd/uploads" ) server.errorlog = "/home/log/lighttpd/error.log" index-file.names = ( "index.php", "index.html", "index.htm", "default.htm", "index.lighttpd.html" ) accesslog.filename = "/home/log/lighttpd/access.log" url.access-deny = ( "~", ".inc" ) static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" ) server.pid-file = "/var/run/lighttpd.pid" include_shell "/usr/share/lighttpd/create-mime.assign.pl" include_shell "/usr/share/lighttpd/include-conf-enabled.pl" conf-enabled/10-fastcgi.conf server.modules += ( "mod_fastcgi" ) fastcgi.server = ( "/" => ( ( "min-procs" => 1, "check-local" => "disable", "host" => "127.0.0.1", # local "port" => 3000 ), ) ) Any idea ?

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• Synergy: Cannot send media keys from Linux to Mac

  - by CraftyThumber

  I have a Linux Synergy server (Si-Linux) serving just one Mac client (Macbook Pro UK) (SiBook-Pro.local). On my Linux server I am using a USB Apple keyboard with the exact layout of the laptops keyboard (the compact UK aluminium keyboard). I would like to send the media keys to the Mac client at all times and I have attempted the following in my synergy.conf: keystroke(AudioPlay) = keystroke(AudioPlay,SiBook-Pro.local) This did not seem to work so I ran both the server and client as foreground processes and with debugging enabled and observed the following: Server Log: DEBUG1: activate actions DEBUG1: hotkey: keyDown(AudioPlay,SiBook-Pro.local) DEBUG1: onKeyDown id=57523 mask=0x0000 button=0x0000 DEBUG1: send key down to "SiBook-Pro.local" id=57523, mask=0x0000, button=0x0000 DEBUG1: deactivate actions DEBUG1: hotkey: keyUp(AudioPlay,SiBook-Pro.local) DEBUG1: onKeyUp id=57523 mask=0x0000 button=0x0000 DEBUG1: send key up to "SiBook-Pro.local" id=57523, mask=0x0000, button=0x0000 Client Log: DEBUG1: recv key down id=0x0000e0b3, mask=0x0000, button=0x0000 DEBUG1: mapKey e0b3 (57523) with mask 0000, start state: 0000 DEBUG1: key e0b3 is not on keyboard DEBUG1: recv key up id=0x0000e0b3, mask=0x0000, button=0x0000 DEBUG1: recv enter, 1279,386 5 2000 As you can see, the client claims the key received is not on keyboard. I don't understand since it is the same key as is on the Macbook's keyboard. I tried to reverse the client-server config to see if I could capture the key being sent if I pressed the Play button on the Macbook but the key doesn't seem to even make it to Synergy. Almost all keyboard presses get logged but the media keys seem to bypass the logs and just execute their function locally. E.g. I press play on the Macbook (with the Macbook as the server) and the key plays music on the Macbook and the key is not logged to the debug log.

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• SQL Server Instance login issue

  - by reallyJim

  I've just brought up a new installation of SQL Server 2008. I installed the default instance as well as one named instance. I'm having a problem connecting to the named instance from anywhere besides the server itself with any user besides 'sa'. I am running in mixed mode. I have a login/user that has a known username. Using that user/login, I can properly connect when directly on the server. When I attempt to login from anywhere else, I recieve a "Login failed for user ''", with Error 18456. In the log file in the server, I see a reason that doesn't seem to help: "Reason: Could not find a login matching the name provided.". However, that user/login DOES exist, as I can use it locally. There are no further details about the error. Where can I start to find something to help me with this? I've tried deleting and recreating the user, as well as just creating a new one from scratch--same result, locally fine, remotely an error. EDIT: Partially Resolved. I'm now passed the base issue--the clients were trying to connect via the default instance. I don't know why. So, once proper ports were opened in the firewall, and a static port assigned to the named instance, I can now connect--BUT ONLY if I specify the connection as Server,Port. SQLBrowser is apparently not helping/working in this case. I've verified it IS running, and done a stop/restart after my config changes, but no difference yet.

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• How can I setup a Proxy I can sniff traffic from using an ESX vswitch in promiscuous mode?

  - by sandroid

  I have a pretty specific requirement, detailed below. Here's what I'm not looking for help for, to keep things tidy and on topic: How to configure a standard proxy Any ESX setup required to facilitate traffic sniffing How to sniff traffic Any changes in design (my scope limits me) I need to setup a test environment for a network-sniffing based HTTP app monitoring tool, and I need to troubleshoot a client issue but he only has a prod network, so making changes to the config on client's system "just to try" is costly. The goal here is to create a similar system in my lab, and hit the client's webapp and redirect my traffic - using a proxy - into the lab environment. The reason I want to use a proxy is so that only this specific traffic is redirected for all to see, and not all my web traffic (like my visits to serverfault :P). Everything will run inside an ESX 4.1 machine. In there, there is a traffic collection vswitch in promiscuous mode that is not on the local network for security reasons. The VM containing our listening agent is connected to this vswitch. On the same ESX host, I will setup a basic linux server and install a proxy (either apache + mod_proxy or squid, doesn't matter). I'm looking for ideas on how to deploy this for my needs so I can then figure out how to set it up accordingly. Some ideas I've had were to setup two proxies, and have them talk to eachother through this vswitch in promiscuous mode, but it seems like alot of work. Another idea is a dual-homed proxy, but I've never seen/done that before so I'm not sure how doable it is for what I'd like. I am OK with setting up a second vswitch in promiscuous mode to facilitate this if need be, but I cannot put the vswitch on the lan (which is used so my browser would communicate with the proxy) in promiscuous mode. Any ideas are welcome.

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• Squid reverse proxy array - siblings not communicating with each other

  - by V. Romanov

  I want to set up 2 squid servers to act as reverse proxy and cache for a webserver on our intranet. The load balancing will be done with DNS round robin or just different mappings for different clients. The thing is, I want both servers to try and contact each other to see if they have the object required in cache before contacting the webserver for it (the network that servers the webserver is the bottleneck and I'm trying to eliminate it) Both squids are configured the same, here are the relevant config lines : acl dvr1_cache_it_best_tv_com dstdomain dvr1.cache.it.best-tv.com acl squid1_it_best_tv_com dstdomain squid1.it.best-tv.com acl squid2_it_best_tv_com dstdomain squid2.it.best-tv.com http_access allow dvr1_cache_it_best_tv_com http_access allow squid1_it_best_tv_com http_access allow squid2_it_best_tv_com http_access allow all http_port 8081 accel defaultsite=dvr1.cache.it.best-tv.com cache_peer dvr1.origin.it.best-tv.com parent 80 0 no-query originserver name=Proxy_dvr1_origin_it_best_tv_com cache_peer squid1.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid1_it_best_tv_com cache_peer squid2.it.best-tv.com sibling 8081 3130 weight=10 name=Proxy_Squid2_it_best_tv_com cache_peer_access Proxy_dvr1_origin_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid1_it_best_tv_com allow dvr1_cache_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid1_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow squid2_it_best_tv_com cache_peer_access Proxy_squid2_it_best_tv_com allow dvr1_cache_it_best_tv_com just to make it clear - dvr1.cache is the alias for the proxy servers. dvr1.origin is the web server. Both servers work, both serve content and cache it and work fine. However, when I clear the cache on one server and then access it, it gets the content from the parent (DVR1_ORIGIN) instead of going to the sibling squid. What did I configure wrong? Or perhaps I don't understand the architecture correctly? I read the squid manuals but as far as I see i did it all by the book and yet it doesn't work right. Any help will be appreciated!

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• Ubuntu 12.10 64bit host reboots when trying to install any guest system using VirtualBox

  - by gts123

  I am having a really nasty problem with VirtualBox as everytime I try to install any guest OS(using ISO file as CD for installation media), the installation starts normally but as soon as it is about to start either installing to virtual hard drive or loading(e.g. as LiveFS) it causes the host system to reboot abruptly. Config is as below: Host system: Ubuntu 12.10 64bit - Intel® Core i7-2640M CPU @ 2.80GHz × 4 Virtualbox version: 4.1.18_Ubuntu r78361 Guest OS systems tried: 32bit version of FreeBSD 9, Debian 6, Tails 0.14 VM setup Tried to have the minimal setup necessary just in case it would avoid for each system to make sure I'd avoid conflicts, but to no avail. I've tried different values and combinations of the below but the problem still persists: Shared Clipboard: Disabled Show in fullscreen/seamless: Disabled Remember runtime changes: DIsabled Base Memory: 2048 MB Chipset: PIIX3 IO APIC: Disabled EFI: Disabled Absolute Pointing device: Disabled Processor(s): 1 CPU PAE/NX: Disabled VT-x/AMD-V: Disabled Video Memory: 12 MB 3d/2d acceleration: Disabled Storage IDE COntroller: PIIX3 (same as chipset instead of PIIX4) Use host I/O cache: No Audio: disabled Network adapter: NAT USB controller: disabled No shared folder Also another sideeffect of the reboot is that it appears that it does not log any information in the error log files; not making things any easier. Please help.

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• pam_tally2 causing unwanted lockouts with SCOM or Nervecenter

  - by Chris

  We use pam_tally2 in our system-auth config file which works fine for users. With services such as SCOM or Nervecenter it causes lockouts. Same behavior on RHEL5 and RHEL6 This is /etc/pam.d/nervecenter #%PAM-1.0 # Sample NerveCenter/RHEL6 PAM configuration # This PAM registration file avoids use of the deprecated pam_stack.so module. auth include system-auth account required pam_nologin.so account include system-auth and this is /etc/pam.d/system-auth auth sufficient pam_centrifydc.so auth requisite pam_centrifydc.so deny account sufficient pam_centrifydc.so account requisite pam_centrifydc.so deny session required pam_centrifydc.so homedir password sufficient pam_centrifydc.so try_first_pass password requisite pam_centrifydc.so deny auth required pam_tally2.so deny=6 onerr=fail auth required pam_env.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth required pam_deny.so account required pam_unix.so account sufficient pam_succeed_if.so uid < 500 quiet account required pam_permit.so password requisite pam_cracklib.so try_first_pass retry=3 minclass=3 minlen=8 lcredit=1 ucredit=1 dcredit=1 ocredit=1 difok=1 password sufficient pam_unix.so sha512 shadow try_first_pass use_authtok remember=8 password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so The login does work but it also triggers the pam_tally counter up until it hits 6 "false" logins. Is there any pam-ninjas around that could spot the issue? Thanks.

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• DRBD stacked resources: recovering from failure

  - by Marcus Downing

  We're running a stacked four-node DRBD setup like this: A --> B | | v v C D This means three DRBD resources running across these four servers. Servers A and B are Xen hosts running VMs, while servers C and D are for backups. A is in the same datacentre as C. From server A to server C, in the first datacentre, using protocol B From server B to server D, in the second datacentre, using protocol B From server A to server B, different datacentres, stacked resource using protocol A First question: booting a stacked resource We haven't got any vital data running on this setup yet - we're still making sure it works first. This means simulating power cuts, network outages etc and seeing what steps we need to recover. When we pull the power out of server A, both resources go down; it attempts to bring them back up at next boot. However, it only succeeds at bringing up the lower-level resource, A-C. The stacked resource A-B doesn't even try to connect, presumably because it can't find the device until it's a connected primary on the lower level. So if anything goes wrong we need to manually log in and bring that resource up, then start the virtual machine on top of it. Second question: setting the primary of a stacked resource Our lower-level resources are configured so that the right one is considered primary: resource test-AC { on A { ... } on C { ... } startup { become-primary-on A; } } But I don't see any way to do the same with a stacked resource, as the following isn't a valid config: resource test-AB { stacked-on-top-of test-AC { ... } stacked-on-top-of test-BD { ... } startup { become-primary-on test-AC; } } This too means that recovering from a failure requires manual intervention. Is there no way to set the automatic primary for a stacked resource?

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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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• Forward secrecy in Nginx (CentOS6)

  - by Anil

  I am trying to enable Forward secrecy in CentOS with nginx webserver. What I have tried I have read some tutorials and seems like we should have nginx, openssl latest versions to enable it. So I had installed the openssl latest from source. sudo wget http://www.openssl.org/source/openssl-1.0.1e.tar.gz sudo tar -xvzf openssl-1.0.1e.tar.gz cd openssl-1.0.1e sudo ./config --prefix=/usr/local sudo make sudo make install Now OpenSSL supports the Eliptic Curve ciphers(ECDHE). I tested this with openssl s_server also. It worked well. Next, I replaced Nginx with latest. sudo wget http://nginx.org/packages/centos/6/x86_64/RPMS/nginx-1.4.2-1.el6.ngx.x86_64.rpm sudo rpm -e nginx sudo rpm -ivh nginx-1.4.2-1.el6.ngx.x86_64.rpm and configured Nginx as described in this link ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_prefer_server_ciphers on; ssl_ciphers EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA256:EECDH+aRSA+RC4:EDH+aRSA:EECDH:RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS; http://baudehlo.wordpress.com/2013/06/24/setting-up-perfect-forward-secrecy-for-nginx-or-stud/ But now Nginx does not support ECDHE ciphers. It supports DHE ciphers. I tried by just enabling ECDHE cipher in nginx still doesn't work. I am using latest web browser(chrome 29 and it support this cipher) Am i missing anything ? Or Having issues with CentOS or Nginx? I read somewhere that ECC patent issues with CentOS, is this causing problem?

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• nginx redirect proxy

  - by andrew

  I have a web app running on a nginx server on local ip 192.168.0.30:80 I have this in my etc/hosts 127.0.0.1 w.myapp.in If someone accesses my app using a "w" subdomain, it shows a webdav interface, otherwise it runs normally (for example, someone calls http://myapp.in , it goes into the app, and http://w.myapp.in goes into webdav interface - this is done within the app, nginx has nothing to do with it) Because I don't have a dns or anything like that, users must access the app by ip. A problem appears if someone wants to access the webdav interface, because you cannot access the app by a subdomain - unless you write a line in your local hosts file, which is not a solution) A possible solution If it's possible to setup the nginx server so that if someone calls http://192.168.0.30 (on port 80), it goes normally into the app, but if a user tries to access say http://192.168.0.30:81 (another defined port) it redirects internally to w.myapp.in, and the app sees the subdomain Given the app, can this be done? If yes, what should I put in the nginx config file? And if you guys think of a better solution, I'm open to any.

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• _default_ VirtualHost overlap on port 443, the first has precedence

  - by Mohit Jain

  I have two ruby on rails 3 applications running on same server, (ubuntu 10.04), both with SSL. Here is my apache config file: <VirtualHost *:80> ServerName example1.com DocumentRoot /home/me/example1/production/current/public </VirtualHost> <VirtualHost *:443> ServerName example1.com DocumentRoot /home/me/example1/production/current/public SSLEngine on SSLCertificateFile /home/me/example1/production/shared/example1.crt SSLCertificateKeyFile /home/me/example1/production/shared/example1.key SSLCertificateChainFile /home/me/example1/production/shared/gd_bundle.crt SSLProtocol -all +TLSv1 +SSLv3 SSLCipherSuite HIGH:MEDIUM:!aNULL:+SHA1:+MD5:+HIGH:+MEDIUM </VirtualHost> <VirtualHost *:80> ServerName example2.com DocumentRoot /home/me/example2/production/current/public </VirtualHost> <VirtualHost *:443> ServerName example2.com DocumentRoot /home/me/example2/production/current/public SSLEngine on SSLCertificateFile /home/me/example2/production/shared/iwanto.crt SSLCertificateKeyFile /home/me/example2/production/shared/iwanto.key SSLCertificateChainFile /home/me/example2/production/shared/gd_bundle.crt SSLProtocol -all +TLSv1 +SSLv3 SSLCipherSuite HIGH:MEDIUM:!aNULL:+SHA1:+MD5:+HIGH:+MEDIUM </VirtualHost> Whats the issue: On restarting my server it gives me some output like this: * Restarting web server apache2 [Sun Jun 17 17:57:49 2012] [warn] _default_ VirtualHost overlap on port 443, the first has precedence ... waiting [Sun Jun 17 17:57:50 2012] [warn] _default_ VirtualHost overlap on port 443, the first has precedence On googling why this issue is coming I got something like this: You cannot use name based virtual hosts with SSL because the SSL handshake (when the browser accepts the secure Web server's certificate) occurs before the HTTP request, which identifies the appropriate name based virtual host. If you plan to use name-based virtual hosts, remember that they only work with your non-secure Web server. But not able to figure out how to run two ssl application on same server. Can any one help me?

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• VMWare ESXi 5 - Expanded RAID 5 array - cannot access datastore

  - by Dayton Brown

  I'm using VMWare ESXi 5 and had a 2 TB RAID 5 setup on an HP DL360 with a P400i RAID card. I added two more 1 TB drives and using the SmartStart ACU, added the drives and expanded the logical disk. Now after booting back to ESXi, the server boots, but lists no available persistent storage. I've rescanned multiple times to no avail: the Datastore doesn't show up. I booted to GParted and the 1.8TB partition shows up, but it shows as unknown. Anyone have any good ideas? EDIT: Final Solution So after much gnashing of teeth, it was fairly simple to solve. I purchased an eSata 2 TB external drive and a PCI eSata card for my server. I then used Clonezilla to image the current partitions to my new external drive. You have to check "don't check drive sizes" in advanced mode, otherwise it will yell at you for have a smaller drive. For some reason my PCI card wouldn't boot on my HP server, so I hooked the drive up to another desktop I had, booted to VMWare, and copied the vmdk's to another drive. I'm going to blow out the RAID config and then create 1.5TB logical drives.

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• Ubuntu 12.10, Unity, AMD 12.11 beta drivers, AMD APP SDK 2.7 and OpenCL detection of multiple gpus

  - by junkie

  I'm using Ubuntu 12.10, AMD 12.11 beta drivers, AMD APP SDK 2.7 and OpenCL. I have three amd radeon 7990s plugged in each of which are a dual 7970 so I have six gpus altogether. I plan to go up to eight in a few days. Windows couldn't use even 4 but linux works fine with 6 so far. The strange thing is that the six gpus are only detected by OpenCL in unity (the ubuntu default window manager). If I switch to e17, blackbox or fluxbox or anything else for that matter OpenCL only detects one. I'm using a simple OpenCL program to list all devices to check. I've also checked the output of aticonfig --list-adapters, fglxinfo and clinfo. The first two always show six in all window managers wheras clinfo shows 6 in unity but 1 gpu in all other WMs. I'm also using an X config generated by aticonfig --initial -f --adapter=all. I'm also only using one monitor. I've also checked using lsmod that the fglrx module is loaded in all WMs. So I have two questions. Why does OpenCL see six gpus only in unity? How can I enable six gpus on other lightweight WMs? Basically I'm getting at what determines how many gpus the OpenCL runtime sees? Thanks.

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• Can I use iptables on my Varnish server to forward HTTPS traffic to a specific server?

  - by Dylan Beattie

  We use Varnish as our front-end web cache and load balancer, so we have a Linux server in our development environment, running Varnish with some basic caching and load-balancing rules across a pair of Windows 2008 IIS web servers. We have a wildcard DNS rule that points *.development at this Varnish box, so we can browse http://www.mysite.com.development, http://www.othersite.com.development, etc. The problem is that since Varnish can't handle HTTPS traffic, we can't access https://www.mysite.com.development/ For dev/testing, we don't need any acceleration or load-balancing - all I need is to tell this box to act as a dumb proxy and forward any incoming requests on port 443 to a specific IIS server. I suspect iptables may offer a solution but it's been a long while since I wrote an iptables rule. Some initial hacking has got me as far as iptables -F iptables -A INPUT -p tcp -m tcp --sport 443 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to 10.0.0.241:443 iptables -t nat -A POSTROUTING -p tcp -d 10.0.0.241 --dport 443 -j MASQUERADE iptables -A INPUT -j LOG --log-level 4 --log-prefix 'PreRouting ' iptables -A OUTPUT -j LOG --log-level 4 --log-prefix 'PostRouting ' iptables-save > /etc/iptables.rules (where 10.0.0.241 is the IIS box hosting the HTTPS website), but this doesn't appear to be working. To clarify - I realize there's security implications about HTTPS proxying/caching - all I'm looking for is completely transparent IP traffic forwarding. I don't need to decrypt, cache or inspect any of the packets; I just want anything on port 443 to flow through the Linux box to the IIS box behind it as though the Linux box wasn't even there. Any help gratefully received... EDIT: Included full iptables config script.

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• Apache: How to enable Directory Index browsing at the Doc Root level?

  - by Brian Lacy

  I have several web development projects running on Fedora 13. I generally setup Apache to serve my larger projects as Virtual Hosts, but I've got several small projects cycling through that I don't really care to setup a VirtualHost for each one. Instead I'd like them all under a subdirectory of the main VirtualHost entry. I just want Apache to serve me the directory index when I browse to the host name. For example, the hostname projects.mydomain.com refers to /var/www/projects, and that directory contains only subdirectories (no index file). Unfortunately when I browse to the host directly I get: Forbidden You don't have permission to access / on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. But my virtual host entry in my apache config looks like this: <VirtualHost *> ServerName projects.mydomain.com DocumentRoot /var/www/projects <Directory "/var/www/projects"> Options +FollowSymlinks +Indexes AllowOverride all </Directory> </VirtualHost> What am I missing here?

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• Updating WordPress 3.6 to 3.7 via admin area on Nginx VPS hangs and fails

  - by harryg

  So I have a few WordPress sites running on my VPS (Ubuntu 12.10, Nginx, php-fpm 5.4) The sites are all on seperate vhosts and use their own config files (albeit similar to each other) and vary in complexity. One is very simple and uses minimal plugins. When I try to update core on any site via the admin area I click the "Update Now" button (which should run the script in wp-admin/update-core.php the page hangs for a minute or two before going to a blank admin page (i.e. the wp-admin menu bars and header bar are there but there is no content in the body of the page). Visiting another admin page via the still menu bar reveals that the core has not been updated. Checking the error log I see this entry: 2013/10/29 23:20:48 [error] 9384#0: *5318248 upstream timed out (110: Connection timed out) while reading upstream, client: --.---.--.---, server: www.mysite.com, request: "POST /wp-admin/update-core.php?action=do-core-upgrade HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "mysite.com", referrer: "http://mysite.com/wp-admin/update-core.php" This didn't happen in the past on older updates and the rest of the site including updating plugins works fine. Any ideas? Could it be as simple as a time-out error? I find that unlikely as the server should munch though a wp upgrade in seconds.

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• How to host an ssh server?

  - by balki

  Hi, I have a broadband internet connection. I have an wireless modem (Airtel India). I don't have a static ip address. I want to host a ssh/web/ftp server to be visible to the outside world just for testing and learning purpose so I can ask my friend to connect to my current ip address and test. My modem has an admin interface which allows to port forward and open ports. I set up ssh server as shown and checked if port 22 is open using this website , Port Scan And port 22 is open. I have an openssh server running and it works if i do, ssh [email protected] which is my local ip address but doesn't work if i do ssh [email protected] where 122.xx.xx.xx is my external ip address of my modem which i checked from whatismyipaddress.com. Since it looks like the port is open, I wonder if there is some setting I need to change in my server config to expose my server. How should I go about solving this?

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• Upgrading only certain packages via the getdeb repo

  - by intuited

  I'm a bit confused about how getdeb.net works now. The last time I got a package from there was a while ago; at that point the procedure was that you would just download a .deb for each package that you wanted to install/upgrade and then install it using dpkg -i. However the inexorable march of progress has lent its trumpets to this system as well, and getdeb installs are now done via their repo, which is registered with apt in /etc/apt/sources.list.d, after you install a single package that makes the changes to the apt database. I've installed that package, and I've discovered that aptitude dist-upgrade now wants to upgrade a lot of packages on my system that weren't ready for upgrades prior to the installation of the getdeb package. If I rename the file /etc/apt/sources.list.d/getdeb.list to something with a different extension, then do aptitude update && aptitude dist-upgrade, it stops wanting to upgrade packages. So I gather that the default behaviour is now to upgrade all packages to the version available at getdeb. This is not particularly appropriate, since these packages are not as well tested as the officially released versions. Is there a config setting somewhere that will prevent upgrading packages to versions from the getdeb repo unless this action is specifically selected? I'd like to be able to pick and choose what packages are upgraded via getdeb.

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• Debian Wheezy 7.5 64bit xfce4 install error ( no desktop environment installed already )

  - by GeoMind

  i wrote a CD with an iso-image from debian.org. the debian-7.5.0-amd64-CD-1.iso from this folder. Debian Wheezy 7.5 stable 64bit There was an error at Select and install software step. It said Retrieving file 770 from 800 and then it failed the installation. I continued the instal and when i opened the computer it doesn't work the Ctrl + Alt + F7 as i waited. It starts at tty1 and after logging in i edited config file cause it had a lot of errors and said E: Unable to correct problems, you have held broken packages or Couldn't found the package. FILE: /etc/apt/sources.list # deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main #deb cdrom:[Debian GNU/Linux 7.5.0 _Wheezy_ - Official amd64 CD Binary-1 20140426-13:37]/ wheezy main deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free deb http://ftp.us.debian.org/debian/ squeeze main contrib non-free deb-src http://ftp.us.debian.org/debian/ squeeze main contrib non-free After that i tried to install xfce4 as desktop environment. Guide found at Linux Panda But it print at terminal: What i sould do? How i can fix this problem?

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• Isolating Apache virtualhosts from the rest of the system

  - by JesperB

  I am setting up a web server that will host a number of different web sites as Apache VirtualHosts, each of these will have the possibility to run scripts (primarily PHP, possiblu others). My question is how I isolate each of these VirtualHosts from eachother and from the rest of the system? I don't want e.g. website X to read the configuration of website Y or any of the server's "private" files. At the moment I have set up the VirtualHosts with FastCGI, PHP and SUExec as described here (http://x10hosting.com/forums/vps-tutorials/148894-debian-apache-2-2-fastcgi-php-5-suexec-easy-way.html), but the SUExec only prevents users from editing/executing files other than their own - the users can still read sensitive information such as config files. I have thought about removing the UNIX global read permission for all files on the server, as this would fix the above problem, but I'm not sure if I can safely do this without disrupting the server function. I also looked into using chroot, but it seems that this can only be done on a per-server basis, and not on a per-virtual-host basis. I'm looking for any suggestions that will isolate my VirtualHosts from the rest of the system. PS I'm running Ubuntu 12.04 server

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• OS X (10.6) Apache Sudden Death, Nginx not working either...

  - by Jesse Stuart

  Hi, I turned on my computer today and apache wasn't working. This is weird as its been working for the last 6 months without issue. The only thing I did which may of caused a problem, is I uninstalled a bunch of gems. This shouldn't be the issue though as apache doesn't rely on gems. I decided to give nginx a try to see if it would work and have the exact same issue. The symtoms are: I go to http://localhost and get the browsers default 404 page (not rendered by apache/nginx) No error is found anywhere (I checked all logs) Apache is rinning (also tried with Nginx) How can I debug this to find the root of the problem? I can't think of why this would be happening. I've tried repairing permissions in case this was the issue, apparently it wasn't. Everything was working the other day, and nothing changed in the apache config. Update: Here is the output of telnet localhost 80 $ telnet localhost 80 Trying ::1... telnet: connect to address ::1: Connection refused Trying fe80::1... telnet: connect to address fe80::1: Connection refused Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host

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• Sending e-mail on behalf of our customer(s), with Postfix

  - by NathanE

  We send e-mail on behalf of our customers, via our own SMTP services. It's always been a problem for us because usually our "spoofing" of their source address results in the mails being caught in spam traps. This hasn't been a problem in the past due to the small volume and low importance of these mails that we sent. However this requirement has recently changed and we need to fix this issue. We realise that fundamentally our application is sending e-mail incorrectly, as per this post: Send email on behalf of clients However, we would like to resolve the problem at the SMTP server level. We have deployed a server running Postfix. Is it possible to have Postfix automatically adjust the mail headers so that we get this "Sent on behalf of" behaviour? I figure it should just be a case of Postfix noticing that the FROM address is the spoofed (i.e. a domain that is not mentioned in its config anywhere) and therefore inject/replace the appropriate headers to get the desired effect. Thanks.

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