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• Poor NFS Performance: OpenFiler

  - by Safin09

  Good Day Everyone, I have an issue with OpenFiler, a Linux-based operating that converts a computer system into a SAN/NAS appliance. Here is the problem. In my environment we have two Netapp Storevault 500 appliances that I normally perform backups to a NFS share. There are two backup cronjobs that use ghettoVCB to backup two groups of VM's. One group is a pool of 3 VMs. This takes 13 mins to complete. A second job that backups a pool of 5 VMs to a 2nd Storevault appliance which takes 2 hours. We then installed Openfiler on a old server that has 2 core Xeon processors. There is a software RAID 5 process in place. When performing the same backups to a NFS Openfiler share, the first backup job, which takes 13 mins, takes around 4 hours. The second backup job, which takes 2 hours, takes almost 10 hours to complete. This is unacceptable!!!! Especially considering the strain placed on the host ESX Server. I assumed that because of the software RAID 5, the overhead on the CPU explained the long backup times. I then installed Openfiler on a 2nd server, an IBM x306 machine which has a P4 Intel processor. This time no software RAID or any RAID at all. A single 750GB hard drive that contained the OS and the rest of the disk uses to backup VMs to a NFS share. I performed the first backup job of the pool of 3 VMs. This time the backup job took 1 and 1/2 hours to complete instead of 13 mins!!!!!!!!!! Is Openfiler simply poor at being an NFS Server!!!!!!!!!!!!! Has anyone else had these issues with Openfiler?

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• Web Deploy 3.0 Installation Fails

  - by jkarpilo

  I am having difficulty installing Microsoft Web Deploy 3.0 to a Windows Server 2008 R2 box. I have tried installing with both the Web Platform Installer and the MSI package but installation fails while trying to execute the MSI custom action ExecuteRegisterUIModuleCA. This server is a VM and a member of a farm but shared config is disabled while I'm installing. Here's the point at which it fails in the MSI log (starting at line 1875): MSI (s) (80:FC) [15:29:01:358]: Executing op: ActionStart(Name=IISBeginTransactionCA,,) MSI (s) (80:FC) [15:29:01:374]: Executing op: CustomActionSchedule(Action=IISBeginTransactionCA,ActionType=3073,Source=BinaryData,Target=IISBeginTransactionCA,) MSI (s) (80:A8) [15:29:01:374]: Invoking remote custom action. DLL: C:\Windows\Installer\MSI6C6A.tmp, Entrypoint: IISBeginTransactionCA MSI (s) (80:FC) [15:29:01:436]: Executing op: ActionStart(Name=IISRollbackTransactionCA,,) MSI (s) (80:FC) [15:29:01:436]: Executing op: CustomActionSchedule(Action=IISRollbackTransactionCA,ActionType=3329,Source=BinaryData,Target=IISRollbackTransactionCA,) MSI (s) (80:FC) [15:29:01:436]: Executing op: ActionStart(Name=IISCommitTransactionCA,,) MSI (s) (80:FC) [15:29:01:436]: Executing op: CustomActionSchedule(Action=IISCommitTransactionCA,ActionType=3585,Source=BinaryData,Target=IISCommitTransactionCA,) MSI (s) (80:FC) [15:29:01:436]: Executing op: ActionStart(Name=IISExecuteCA,,) MSI (s) (80:FC) [15:29:01:452]: Executing op: CustomActionSchedule(Action=IISExecuteCA,ActionType=3073,Source=BinaryData,Target=IISExecuteCA,CustomActionData=1^3^21^WebDeployment_Current^154^Microsoft.Web.Deployment.UI.PackagingModuleProvider, Microsoft.Web.Deployment.UI.Server, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35^1^1^0^^1^3^28^DelegationManagement_Current^171^Microsoft.Web.Management.Delegation.DelegationModuleProvider, Microsoft.Web.Management.Delegation.Server, Version=9.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35^1^1^0^^1^7^38^system.webServer/management/delegation^4^Deny^16^MachineToWebRoot^0^^3^yes^1^7^31^system.webServer/wdeploy/backup^4^Deny^20^MachineToApplication^0^^2^no^) MSI (s) (80:84) [15:29:01:452]: Invoking remote custom action. DLL: C:\Windows\Installer\MSI6CB9.tmp, Entrypoint: IISExecuteCA 1: IISCA IISExecuteCA : Begin CA Setup 1: IISCA IISExecuteCA : CA 'ExecuteRegisterUIModuleCA' completed with return code hr=0x8007000d 1: IISCA IISExecuteCA : CA 'IISExecuteCA' completed with return code hr=0x8007000d 1: IISCA IISExecuteCA : End CA Setup CustomAction IISExecuteCA returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox) Action ended 15:29:05: InstallFinalize. Return value 3. I can't seem to find any information regarding this particular issue; can someone help point me in the right direction?

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• Limiting bandwidth on internal interface on Linux gateway

  - by Jack Scott

  I am responsible for a Linux-based (it runs Debian) branch office router that takes a single high-speed Internet connection (eth2) and turns it into about 20 internal networks, each with a seperate subnet (192.168.1.0/24 to 192.168.20.0/24) and a seperate VLAN (eth0.101 to eth0.120). I am trying to restrict bandwidth on one of the internal subnets that is consistently chewing up more bandwidth than it should. What is the best way to do this? My first try at this was with wondershaper, which I heard about on SuperUser here. Unfortunately, this is useful for exactly the opposite situation that I have... it's useful on the client side, not on the Internet side. My second attempt was using the script found at http://www.topwebhosts.org/tools/traffic-control.php, which I modified so the active part is: tc qdisc add dev eth0.113 root handle 13: htb default 100 tc class add dev eth0.113 parent 13: classid 13:1 htb rate 3mbps tc class add dev eth0.113 parent 13: classid 13:2 htb rate 3mbps tc filter add dev eth0.113 protocol ip parent 13:0 prio 1 u32 match ip dst 192.168.13.0/24 flowid 13:1 tc filter add dev eth0.113 protocol ip parent 13:0 prio 1 u32 match ip src 192.168.13.0/24 flowid 13:2 What I want this to do is restrict the bandwidth on VLAN 113 (subnet 192.168.13.0/24) to 3mbit up and 3mbit down. Unfortunately, it seems to have no effect at all! I'm very inexperienced with the tc command, so any help getting this working would be appreciated.

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• Short POST data in HTTP

  - by Matt

  We're hosting a customer's Debian Linux web server. It's running a PHP based web application. The server is sitting behind our firewall with it's own virtual interface and port 80 is forwarded internally to a machine sitting in the DMZ. The issue we're having is that when data is posted to the server it seems to be being cut short for some users. It's reproducable for some users on the same box. But the same user sending the same data on the same lan on another PC it works. The data gets cut to around 1140 bytes I'm told. Any idea why this might be happening? The customer is blaming our firewall, but then surely we'd have issues with other services. I'm suspecting it's a problem with the website itself. Suggestions on how to isolate the problem would be of help. Our firewall is Astaro. EDIT: A customer has set the ethernet frame size temporarily to 500bytes on the server. This made it work for now! I know some of the customers are using an internet provider that runs PPPoE

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• Mounting 2.5" SSD in Antec Atlas 550's 3.5" bay

  - by cecilkorik

  Just got some new SSDs to add to my servers, unfortunately there doesn't appear to be anywhere to actually mount them. The cases are Antec Atlas 550 mid-tower server cases. The problem is that the 3.5" bays are intended for 3.5" hard drives (obviously) not SSDs, so they are mounted from the bottom with rubber grommets to reduce vibration. There are NO side-holes in any of the 3.5" bays, all mounting has to be done from the bottom of the drive, through the thick rubber grommets, which requires special extra-long screws with large heads. Those screws will not work with the SSD, the thread is too coarse, 2.5" drives apparently use M3 screws with a finer pitch. The case's 3.5" bays have holes aligned for 2.5" drives and by moving the grommets into the appropriate holes they line up with the SSD. But that's as far as I can get. I don't have and cannot find any screws that use the finer M3 pitch that are long enough and have the wide head. I can't remove the grommets because the screw holes are much too wide without them, the entire head of the screw fits through. And again, there are no side-holes, so I can't use the mounting bracket that came with the drive nor any other 2.5"-3.5" bracket I've found. Here is a pic of what I am dealing with (note that the SSD is just resting on the case, it's not currently screwed in if that's not clear) Any ideas for safely mounting these little guys without resorting to duct tape or superglue would be very appreciated. If anyone knows where I could buy the appropriate type of M3 threaded screw or has any other ideas please help me out here.

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• Mac Management and Security

  - by Bart Silverstrim

  I was going through some literature on managing OS X laptops and asked someone some questions about usage scenarios when using the MacBooks. I asked someone more knowledgeable than I about whether it was possible for my Mac to be taken over if I were visiting another site for a conference or if I went on a wifi network at a local coffee house with policies from an OS X Server with workgroup manager (either legit for the site or someone running a version of OS X Server on hardware they have hidden somewhere on the network), which apparently could be set up to do things like limit my access to Finder or impose other neat whiz-bang management features. He said that it is indeed possible for it to happen as it would be assigned via the DHCP server and the OS X server would assume my Mac is a guest and could hand out restrictions and apparently my Mac will happily accept them without notifying me or giving me an option, unlike Windows which I believe would need to be joined to a domain before it becomes "managed" by Active Directory. So my question is as network admins and sysadmins with users traveling with MacBooks, is there a way to reasonably protect your users from having their machines hijacked without resorting to just turning off networking all the time? Or isn't this much of a security hazard? What threat does this pose to the road warriors in your businesses?

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• Prestashop is not saving Memcached settings

  - by ianenri

  I have a issue with the admin site of prestashop. I'm trying to activate the caching system but it doesn't save the setting. When I add a server (I'm using an Amazon ElasticCache server) saves it, but when I select the enable option and click Save, it redirects me to "Back Office Preferences Performance" but with a blank page and the admin tabs visible. I go back to those settings again and i see that the caching option is disabled. Also, there is a warning: "To use Memcached, you must install the Memcache PECL extension on your server. http://www.php.net/manual/en/memcache.installation.php" , even if i already installed memcached via yum. I tried also, by modifying the settings.inc.php file editing define('_PS_CACHE_ENABLED_', '0'); to: define('_PS_CACHE_ENABLED_', '1'); But i get 500 Internal Server Error in every page, so i prefer to leave it as before. Any ideas? I'm using PrestaShop 1.4.6.2 with Nginx 1.0.11 and PHP-FPM 5.3.8 in a CentOS 5.7 system.

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• 554 - Sending MTA’s poor reputation

  - by Phil Wilks

  I am running an email server on 77.245.64.44 and have recently started to have problems with remote delivery of emails sent using this server. Only about 5% of recipients are rejecting the emails, but they all share the following common message... Remote host said: 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. As far as I can tell my server is not on any blacklists, and it is set up correctly (the reverse DNS checks out and so on). I'm not even sure what the "Sending MTA" is, but I assume it's my server. If anyone could shed any light on this I'd really appreciate it! Here's the full bounce message... Could not deliver message to the following recipient(s): Failed Recipient: [email protected] Reason: Remote host said: 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means. -- The header and top 20 lines of the message follows -- Received: from 79-79-156-160.dynamic.dsl.as9105.com [79.79.156.160] by mail.fruityemail.com with SMTP; Thu, 3 Sep 2009 18:15:44 +0100 From: "Phil Wilks" To: Subject: Test Date: Thu, 3 Sep 2009 18:16:10 +0100 Organization: Fruity Solutions Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01C2_01CA2CC2.9D9585A0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acosujo9LId787jBSpS3xifcdmCF5Q== Content-Language: en-gb x-cr-hashedpuzzle: ADYN AzTI BO8c BsNW Cqg/ D10y E0H4 GYjP HZkV Hc9t ICru JPj7 Jd7O Jo7Q JtF2 KVjt;1;YwBoAGEAcgBsAG8AdAB0AGUALgBoAHUAbgB0AC0AZwByAHUAYgBiAGUAQABzAHUAbgBkAGEAeQAtAHQAaQBtAGUAcwAuAGMAbwAuAHUAawA=;Sosha1_v1;7;{F78BB28B-407A-4F86-A12E-7858EB212295};cABoAGkAbABAAGYAcgB1AGkAdAB5AHMAbwBsAHUAdABpAG8AbgBzAC4AYwBvAG0A;Thu, 03 Sep 2009 17:16:08 GMT;VABlAHMAdAA= x-cr-puzzleid: {F78BB28B-407A-4F86-A12E-7858EB212295} This is a multipart message in MIME format. ------=_NextPart_000_01C2_01CA2CC2.9D9585A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit

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• PHP 5.3 on IIS gives 404 error in CGI mode

  - by reinier

  Slowly losing my mind here. I had PHP 5.2 working fine (ISAPI) under IIS, but for some extension I needed 5.3. So no worries, I installed this but it turns out ISAPI is not supplied anymore. I followed the install tutorials for fastcgi and ended up with a 500 internal server error for every PHP page served. So my current situation is: I have fastcgi removed. In my websites I have added PHP (head, get, post) and routed them to c:\php\php-cgi.exe. Result: every PHP page I try (even the ones with just text) gives 404 not found error. Any HTML file I put in the same folder, serves without a hitch. Who can help me please... How hard can something like this be right? For me apparently very hard. Extra information: ran the installer as suggested below. Set it to use fastcgi. my fcgiext.ini file looks like this now: [types] php=c:\php\php-cgi.exe [c:\php\php-cgi.exe] exepath=c:\php\php-cgi.exe from the command-line a 3 line PHP file with just phpinfo(); works fine from the server the same PHP file with just phpinfo(); results in the internal server 500 error. from the server a PHP file with just text works fine when changing the document types in IIS management console and point the PHP extension directly to c:\php\php-cgi.exe results in 404 for every PHP file the php.ini is the php.ini.production file which came in the distribution. No edits were made. Setting the IIS PHP handler directly to PHP (not via fastcgi) c:\php\php-cgi.exe results in the following: display a PHP page with only text....works fine display a page with only phpinfo(); results in 404 not found

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• Nginx all subdomain points to one subdomain (gitlab) rule

  - by Alkimake

  I have installed gitlab on my server and use nginx as http server... I simply used recipe for gitlab on nginx # GITLAB # Maintainer: @randx # App Version: 3.0 upstream gitlab { server unix:/home/gitlab/gitlab/tmp/sockets/gitlab.socket; } server { listen 192.168.250.81:80; # e.g., listen 192.168.1.1:80; server_name gitlab.xxx.com; # e.g., server_name source.example.com; root /home/gitlab/gitlab/public; # individual nginx logs for this gitlab vhost access_log /var/log/nginx/gitlab_access.log; error_log /var/log/nginx/gitlab_error.log; location / { # serve static files from defined root folder;. # @gitlab is a named location for the upstream fallback, see below try_files $uri $uri/index.html $uri.html @gitlab; } # if a file, which is not found in the root folder is requested, # then the proxy pass the request to the upsteam (gitlab unicorn) location @gitlab { proxy_read_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694 proxy_connect_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694 proxy_redirect off; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_pass http://gitlab; } } gitlab.xxx.com works fine and i get gitlab web documents. But if i want another subdomain i use for Jira (jira.xxx.com) on port 80 (i setup jira on 8080 port normally) gets gitlab web site also. How can i restrict this rule only serving for gitlab, or may be i can redirect jira.xxx.com to jira.xxx.com:8080

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• Red Hat 5.3 on HP Proliant DL380 G5 and failed drive on RAID controller

  - by thinkdreams

  I have a development ERP server here in my office that I assist with support on, and originally the DBA requested a single drive setup for some of the drives on the server. Thus the hardware RAID controller (an HP embedded controller) looks like: c0d0 (2 drive) RAID-1 c0d1 (2 drive) RAID-1 c0d2 (1 drive) No RAID <-- Failed c0d3 (1 drive) No RAID c0d4 (1 drive) No RAID c0d5 (1 drive) No RAID c0d2 has failed. I replaced the drive immediately with a spare using the hot-swap, but the c0d2 continues to mark itself as failed, even when I umount the partition. I'm loathe to reboot the server since I'm concerned about the server coming back up in rescue mode but I'm afraid that's the only way to get the system to re-read the drive. I assumed there was some sort of auto-detection routine for this, but I haven't been able to figure out the proper procedure. I have installed the HP ACU CLI utilties, so I can see the hardware RAID setup. I'd really like to find out what the proper procedure should have been, where I went wrong, and how to correct it now. Obviously this goes without saying I should NOT have listened to the DBA and set the drives up as RAID-1 throughout as was my first instinct. He wasn't worried about data loss, but it sure would have been easier to replace the failed drive. :)

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• What characteristic of networking/TCP causes linear relation between TCP activity and latency?

  - by DeLongey

  The core of this problem is that our application uses websockets for real-time interfaces. We are testing our app in a new environment but strangely we're noticing an increasing delay in TCP websocket packets associated with an increase in websocket activity. For example, if one websocket event occurs without any other activity in a 1-minute period, the response from the server is instantaneous. However, if we slowly increase client activity the latency in server response increases with a linear relationship (each packet will take more time to reach the client with more activity). For those wondering this is NOT app-related since our logs show that our server is running and responding to requests in under 100ms as desired. The delay starts once the server processes the request and creates the TCP packet and sends it to the client (and not the other way around). Architecture This new environment runs with a Virtual IP address and uses keepalived on a load balancer to balance the traffic between instances. Two boxes sit behind the balancer and all traffic runs through it. Our host provider manages the balancer and we do not have control over that part of the architecture. Theory Could this somehow be related to something buffering the packets in the new environment? Thanks for your help.

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• Set default MySQL connect charset for PHP (in RHEL)?

  - by Martijn Heemels

  We're running a hundred or so legacy PHP websites on an older server which runs Gentoo Linux. When these sites were built latin1 was still the common charset, both in PHP and MySQL. To make sure those older sites used latin1 by default, while still allowing newer sites to use utf8 (our current standard), we set the default connect charset in php.ini: mysql.connect_charset = latin1 mysqli.connect_charset = latin1 pdo_mysql.connect_charset = latin1 Specific more modern sites could override this in their bootstrapping code with: <?php mysql_set_charset("utf8", $dsn ); ...and all was well. Now the server is overloaded and we're no longer with that hoster, so we're moving all these sites to a faster server at our standard hoster, which uses RHEL 5 as their OS of choice. In setting up this new server I discover to my surprise that the *.connect_charset directives are a Gentoo specific patch to PHP, and RHEL's version of PHP doesn't recognize them! Now how do I set PHP to connect to MySQL with the latin1 charset? I thought about setting a default in my.cnf but would prefer not to force every app and client to default to latin1. Our policy is to use utf8, and we'd like to restrict the exception to PHP only. Also, converting every legacy site to properly use utf8 is not doable since many are of the touch 'm and you break 'm kind. We simply don't have the time to go fix them all. How would I set a default mysql/mysqli/pdo_mysql connection charset to latin1 for PHP, while still allowing individual scripts to override this to utf8 with mysql_set_charset()?

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• HA Proxy won't load balance my web requests. What have I done wrong?

  - by Josh Smeaton

  I've finally got HA Proxy set up and running in a way I think I want. However, it is not load balancing the web requests it receives. All requests are currently being forwarded to the first server in the cluster. I'm going to paste my configuration below - if anyone can see where I may have gone wrong, I'd appreciate it. This is my first stab at configuring web servers in a *nix environment. First up, I have HA Proxy running on the same host as the first server in the apache cluster. We are moving these servers to virtual later on, and they will have different virtual hosts, but I wanted to get this running now. Both web servers are receiving their health checks, and are reporting back correctly. The haproxy?stats page correctly reports servers that are up and down. I've tested this by altering the name of the file that is checked. I haven't put any load onto these servers yet. I've just opened up the URLs on several tabs (private browsing), and had several co-workers hit the URL too. All of the traffic goes to WEB1. Am I balancing incorrectly? global maxconn 10000 nbproc 8 pidfile /var/run/haproxy.pid log 127.0.0.1 local0 debug daemon defaults log global mode http retries 3 option redispatch maxconn 5000 contimeout 5000 clitimeout 50000 srvtimeout 50000 listen WEBHAEXT :80,:8443 mode http cookie sessionbalance insert indirect nocache balance roundrobin option httpclose option forwardfor except 127.0.0.1 option httpchk HEAD health_check.txt stats enable stats auth rah:rah server WEB1 10.90.2.131:81 cookie WEB_1 check server WEB2 10.90.2.130:80 cookie WEB_2 check

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• Windows 7 PC cannot see some LAN PCs, but can access them via path

  - by zoot

  In an office LAN, with Windows 7 Professional workstations and a FreeNAS Samba server, 2 workstations have intermittent problems in browsing for the other workstations, as well as the FreeNAS server. However, so far, it appears that typing in the path to any of the workstations which aren't visible via the "browse" function, works. ie. the machine Workstation7 is not visible while browsing via Windows Explorer, but is accessible if I type \\Workstation7 in the path field. Occasionally the workstations exhibiting these symptoms show errors that their connection to the FreeNAS server has failed and only rebooting resolves the issue. All other workstations on the network use identical Windows 7 Professional installations and never have these problems. I've checked all machines and they're not using Home Groups. All are setup on the same WorkGroup as the FreeNAS server and the network type is set to Work Network. Temporarily disabling the firewall on the workstations with the issue made no difference, so I know this has nothing to do with the firewall settings. Any pointers would be appreciated. Thanks.

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• Network profile reverts to 'Unidentified' following Windows Update reboot

  - by user140575

  I have searched high and low for a solution to this problem. I have multiple servers running Windows 2000 Server as well as Windows Server 2003, 2003 R2, and 2008 R2. All of these servers are on the same Active Directory domain. The servers run showing the network profile as Domain Network, which is fine and correct. However, when a Windows update is installed, the server changes the profile to Unidentified Network once it has rebooted. This then doesn't allow any traffic to the server. For security reasons, we can't turn the firewalls off for. The only way to fix the problem is to physically be in front of the machine and work on it to change the profile back. Once the Profile has been reinstated to the Domain profile, it will be fine until the next month's update. This happens on all the Windows software mentioned above. The machines are not all identical, so it's not a hardware problem either. If anyone can help I'd be very grateful.

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• Openfire on EC2 with Jingle

  - by Bjorn Roche

  I would like to run Openfire (or another XMPP server) on EC2. At the moment this is just for testing, so easy setup and configuration are important, as is low cost. At some point, however, if things go well, it will be important to scale this. Ideally, it would be nice to not have to switch software when the scaling happens, but if a switch needs to happen later it certainly can. My requirements are: basic XMPP services, including muc and pubsub. Logins controlled from an external API. Preferably, when a user attempts to connect, the XMPP server checks with the api to see if their username and password are correct, but I can also have the API keep the XMPP server up to date on new users, deleted users, pasword changes and so on. I see Openfire has a "user service" API. Not ideal, but it looks workable. Jingle, including relay and STUN. It's not at all clear to me if the Jingle Nodes plugin takes care of this. I'm a bit confused about what's required to set this up, and I'd rather know in advance than be confused along the way :). eg It seems like STUN servers require more than one IP address. Can Openfire do all this for me, including stun and media relay on a single machine? Is this hard to configure on EC2 with Openfire? What are the basic steps? Would this be easier with something else like, say Tigase? What about database? Should I use amazon's database service, or run a db on the same machine? Would the server be compatible with a service like http://www.siteuptime.com/ Thanks!

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• Dell PE2950 - slow IO rates for writing and reading locally

  - by OrenM

  I'm having a serious issue with dell server PE2950. The server has really slow IO rates, so slow that I'm not able to use it anymore I tried few things to solve this: changing disks to new disks (configured them as raid1) changing perc card + perc cables reinstalling the OS of course, had to cause of changing of disks, centos 5.5 x64bit firmware update to everything virtual disks policy: No Read Ahead,Write Back, disk cache policy disabled. openmanage doesn't alert about anything, also i ran dell's diag tests, everything passed, also dell didn't see anything in deset log. dell offered to reseat everything, including the cpu, we did that as well, still io rates are slow I have several PE2950 servers, and I never had such a thing with any of those. All have similar or exact hardware as this one, all configured the same, with the same os centos 5.5 x64, same disks, same raid, same policy. Just for comparison: the problematic PE2950 server: [root@bad ~]# time sh -c "dd if=/dev/zero of=/tmp/ddfile bs=8k count=200000 && sync" 200000+0 records in 200000+0 records out 1638400000 bytes (1.6 GB) copied, 27.7946 seconds, 58.9 MB/s real 0m33.968s user 0m0.531s sys 0m26.000s good PE2950 server (with the exact same hardware): [root@good ~]# time sh -c "dd if=/dev/zero of=/tmp/ddfile bs=8k count=200000 && sync" 200000+0 records in 200000+0 records out 1638400000 bytes (1.6 GB) copied, 3.19999 seconds, 512 MB/s real 0m7.694s user 0m0.053s sys 0m4.057s Hopefully you will have an idea what can cause the problem.

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• Is there any way to detect when nginx has completed a graceful shutdown?

  - by Daniel Vandersluis

  I have a ruby on rails application which is running on passenger and nginx, with one main webserver and multiple application servers. I am trying to update my deployment process in order to minimize (or ideally, remove) any downtime caused by the deployment. The main roadblock right now is that passenger takes some time to restart (ie. reload the application), so in order to get around this, I want to stagger my restarts so that only one app server gets restart at a time. In order to do this without losing any long running passenger processes, I am thinking I need to gracefully shutdown the app server's nginx instance, which will cause it to no longer accept new connections but continue to process the existing ones; as well, HAProxy will detect that the app server is down and route new requests to the other server. However, assuming that there is a long-running process, I am not sure how to detect when the graceful shutdown has completed so that I can start it back up. Since the shutdown is caused by sending a signal (ie. kill -QUIT $( cat /var/run/nginx.pid )), and the kill command will return immediately, I cannot combine commands (ie. kill ... && touch restarted), as the touch command will execute immediately, even if nginx hasn't completed its shutdown. Is there any good way to do this?

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• Ubuntu 12.04 glusterfs volume failed to mount at boot time

  - by user183394

  I have just setup 7 KVM guests, all running Ubuntu 12.04 LTS 64bit Minimal server to test out glusterfs 3.2.5 from the Ubuntu official repo. Two of them form a mirrored pair (i.e. replica 2), and five of them are clients. I am still new to this file system and would like to gain some "hands-on" experience. The setup was mostly uneventful, until I put in the following into each glusterfs client's /etc/fstab: 192.168.122.120:/testvol /var/local/testvol glusterfs defaults,_netdev 0 0, where 192.168.122.120 is the IP address of the first "glusterfs server". If I issue either a manaul mountall or a mount.glusterfs 192.168.122.120:/testvol /var/local/testvol on CLI, a mount shows that the volume is successfully imported. But once a client is rebooted, after it comes back up, the volume is not mounted! I searched the Internet, and found this article, but since I am not running both client and server on the same node, IMHO it's not strictly applicable. So, as a kludgy "get-around", I put in a sleep 3 && mount.glusterfs 192.168.122.120:/testvol /var/local/testvol into each client node's /etc/rc.local. It seems to be able to get the volume mounted on each node, as far as I can tell. But this is quite ugly, and I would appreciate a hint as to how to resolve this glusterfs-non-boot-time-mounting issue correctly. Note that I used the IP address of the first "glusterfs server" although the /etc/hosts of all nodes have been populated with their hostnames. I figured that the use of IP address is more robust. --Zack

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• How to combine try_files and sendfile on Nginx?

  - by hcalves

  I need Nginx to serve a file relative from document root if it exists, then fallback to an upstream server if it doesn't. This can be accomplished with something like: server { listen 80; server_name localhost; location / { root /var/www/nginx/; try_files $uri @my_upstream; } location @my_upstream { internal; proxy_pass http://127.0.0.1:8000; } } Fair enough. The problem is, my upstream is not serving the contents of URI directly, but instead, returning X-Accel-Redirect with a location relative to document root (it generates this file on-the-fly): % curl -I http://127.0.0.1:8000/animals/kitten.jpg__100x100__crop.jpg HTTP/1.0 200 OK Date: Mon, 26 Nov 2012 20:58:25 GMT Server: WSGIServer/0.1 Python/2.7.2 X-Accel-Redirect: animals/kitten.jpg__100x100__crop.jpg Content-Type: text/html; charset=utf-8 Apparently, this should work. The problem though is that Nginx tries to serve this file from some internal default document root instead of using the one specified in the location block: 2012/11/26 18:44:55 [error] 824#0: *54 open() "/usr/local/Cellar/nginx/1.2.4/htmlanimals/kitten.jpg__100x100__crop.jpg" failed (2: No such file or directory), client: 127.0.0.1, server: localhost, request: "GET /animals/kitten.jpg__100x100__crop.jpg HTTP/1.1", upstream: "http://127.0.0.1:8000/animals/kitten.jpg__100x100__crop.jpg", host: "127.0.0.1:80" How do I force Nginx to serve the file relative to the right document root? According to XSendfile documentation the returned path should be relative, so my upstream is doing the right thing.

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• Etag configuration with multiple apache servers or CDN / How does Google do ETags?

  - by perrierism

  I have an application which is served from two apache2 servers and I want to configure the ETags on static content. In the future I would also like to use a CDN. I see that this is supposed to be a problem because the Etag information will be different from server to server... The ETag format for Apache 1.3 and 2.x is inode-size-timestamp. Although a given file may reside in the same directory across multiple servers, and have the same file size, permissions, timestamp, etc., its inode is different from one server to the next. So if you're using more than one webserver to host your app (like 90% of the webapps you use everyday do), it's supposed to be an issue. However I see Google uses Etags, and certainly they use multiple servers and CDN and edge caching, etc... I get a 304 response for any cached Google content. How do they do it? How do you get around the multiple server issue? Is there a way to configure this with Apache?

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• Enabling Samba Shares Across Subnets

  - by John

  I was curious how I could go about setting up SAMBA so that shares could be seen and used across different subnets. We have some Linux devices that are bound to Active Directory and we would like to have them serve SAMBA shares to clients that will reside in a different subnet than what the servers reside in? Is there any way to do this without needing to setup a WINS server or use legacy NetBIOS methods since the majority of our clients are Windows 7, Windows Server 2003, Windows Server 2008, and Macintosh OS X (10.6 or newer)? EDIT Right now, only clients in the same subnet as the SAMBA server can see the shares. Clients outside of the subnet (i.e. the client subnet) cannot see or connect to the share. The error returned is: The specified network name is no longer available. It does not seem to matter if I use IP, FQDN, or NetBIOS name to try and connect to the share with. We have a common Cisco router handling the inter-subnet routing. Everything else seems to work correctly with this network setup and the device can be pinged from multiple subnets. I also do not believe it to be a firewall type of issue since the rules for this segment are rather lax.

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• How do I troubleshoot a segfault in Ubuntu that occurs when typing a bogus command?

  - by Alan

  We've got a production server running Ubuntu 11.10. We're encountering segfaults that appear under various conditions. The simplest reproducible case is when we login to an ssh session as our administrative user and enter a bogus command. You'd expect the standard "command not found" error message. Instead, we get a segfault in python. The user's default shell is /bin/bash. For example: $ asdf Segmentation fault Info from /var/log/syslog: Jul 6 15:39:20 PROD001 kernel: [2155960.605695] python[7873]: segfault at 0 ip (null) sp 00007fffd030b808 error 14 in python2.7[400000+233000] Some details about the server: $ uname -a Linux PROD001 3.0.0-16-server #29-Ubuntu SMP Tue Feb 14 13:08:12 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/issue Ubuntu 11.10 \n \l Before we ask the IT department to reinstall the O.S., I'd like to understand what got us here. The system and/or this particular user's environment is suspect. Many people have touched this server over the past year, so I'm wondering if it is missing libraries, incorrectly installed packages, etc. I'm hoping that if we can understand what's going wrong in this case, it will help explain why we're getting segfaults in a couple of other scenarios. Any tips on troubleshooting this segfault will be appreciated!

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• Time not propagating to machines on Windows domain

  - by rbeier

  We have a two-domain Active Directory forest: ourcompany.com at the root, and prod.ourcompany.com for production servers. Time is propagating properly through the root domain, but servers in the child domain are unable to sync via NTP. So the time on these servers is starting to drift, since they're relying only on the hardware clock. WHen I type "net time" on one of the production servers, I get the following error: Could not locate a time-server. More help is available by typing NET HELPMSG 3912. When I type "w32tm /resync", i get the following: Sending resync command to local computer The computer did not resync because no time data was available. "w32tm /query /source" shows the following: Free-running System Clock We have three domain controllers in the prod.ourcompany.com subdomain (overkill, but the result of a migration - we haven't gotten rid of one of the old ones yet.) To complicate matters, the domain controllers are all virtualized, running on two different physical hosts. But the time on the domain controllers themselves is accurate - the servers that aren't DCs are the ones having problems. Two of the DCs are running Server 2003, including the PDC emulator. The third DC is running Server 2008. (I could move the PDC emulator role to the 2008 machine if that would help.) The non-DC servers are all running Server 2008. All other Active Directory functionality works fine in the production domain - we're only seeing problems with NTP. I can manually sync each machine to the time source (the PDC emulator) by doing the following: net time \\dc1.prod.ourcompany.com /set /y But this is just a one-off, and it doesn't cause automated time syncing to start working. I guess I could create a scheduled task which runs the above command periodically, but I'm hoping there's a better way. Does anyone have any ideas as to why this isn't working, and what we can do to fix it? Thanks for your help, Richard

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