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Articles indexed Wednesday September 26 2012

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• Can I flash a PCI-E device's Firmware in a VM if the VM has exclusive IOMMU access?

  - by RibaldEddie

  I have a PCI-E Dell Perc 6/i RAID card that I'd like to flash with the latest firmware. Apparently I need either a Redhat / Centos OS or Windows in order to flash the firmware, but I have a VMWare 5.0.1 ESX hypervisor installed on the box and a CentOS guest OS. My motherboard support IOMMU and I have successfully used VMWare's PCI Passthrough feature to give VMs exclusive access to a PCI-E device. Is it safe to flash the firmware of a PCI-E device if that device is passed through to a single VM using the passthrough feature of VMware? Or should I boot one of the supported OSes directly on the bare metal?

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• HAProxy -- pause/queue all traffic without losing requests

  - by Marc

  I basically have the same problem as mentioned in this thread -- I would like to temporarily suspend all requests to all servers of a certain backend, so that I can upgrade the backend and the database it uses. Since this is a live system, I would like to queue up requests, and send them to the backend servers once they've been upgraded. Since I'm doing a database upgrade with the code change, I have to upgrade all backend servers simultaneously, so I can't just bring one down at a time. I tried using the tcp-request options combined with removing the static healthcheck file as mentioned in that thread, but had no luck. Setting the default "maxconn" value to 0 seems to pause and queue connections as desired, but then there seems to be no way to increase the value back to a positive number without restarting HAProxy, which kills all requests that had been queued up until that point. (The "hot-reconfiguration" options using -sf and -st start a new process, which doesn't seem to do what I want). Is what I'm trying to do possible?

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• Poor WAMP performance when using SMB/UNC Paths

  - by Brad

  I've configured a WAMP (Windows Apache MySQL and PHP) stack when when configured to use local storage takes 3-4 seconds to load. When I use an SMB/UNC share it takes 12-15 seconds to load. Here are the two lines in my httpd.conf: #DocumentRoot "//10.99.108.11/test_htdocs" #<Directory "//10.99.108.11/test_htdocs"> #DocumentRoot "C:/www" #<Directory "C:/www"> Is there performance tuning I can do on windows server 2008 R2 to improve performance or is there another way to improve performance using smb

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• ML 350 additional SATA RAID controller (mirror only)

  - by Nicholas

  I have a Proliant ML350 G8 with two SAS raid arrays currently set up - thereby maxing the default P420i raid controller. I need to set up a large video dump space in addition to this existing set-up (for non backed up, non-critical, temporary storage). I had planned to just add a 2TB SATA disk and plug it into the motherboard. However I it occurred to me the motherboard might have built-in mirror RAID support? Therefore I could use two SATA disks and have some semblance of redundancy. Is this possible? Or would I need to get a cheap raid card? Any recommendations?

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• Apache - setting up a subdomain

  - by Adam

  I'm having trouble getting a subdomain working for an Apache Linux Install. Following is what I've configured: DNS: connect.goneglobal.com. CNAME 54.251.35.112 Apache httpd.conf: <VirtualHost *:80> DocumentRoot /var/www/html/connect.goneglobal.com ServerName connect.goneglobal.com </VirtualHost> restart httpd - this ip is registered to this server - works for other sites on this apache. (first time I've tried a subdomain). Appears the issue is with DNS potentially and it doesn't seem to get to the site. Note: I have an index.php in the Documentroot. Note: there is an A record for goneglobal.com. which goes to a different hosting provider. thx

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• Why am I getting Network error: 403 Forbidden in firebug for files I am not trying to access?

  - by moomoochoo

  QUESTIONs I'd like to know why I am getting Network error: 403 Forbidden in firebug for files that I am not trying to access? is it likely to cause any serious problems on the webserver? how to fix it. Why is my browser trying to access those files in the error message? DETAILS I’m using wampserver 2.2 to access a folder via the browser. The browser is on the same computer as the server. The computer is running windows 7 ultimate. When I view a web folder via my browser hXXp://localhost/folder I can see the folder contents ok but in firebug I get Network error: 403 Forbidden I’m not deliberately trying to access those files in the error msgs. You will notice they are in a completely different folder to the one I am looking at. I check the apache_error.log and see [Wed Sep 26 00:05:10 2012] [error] [client 127.0.0.1] client denied by server configuration: C:/apache2, referer: hxxp://localhost/folder/ Wampserver 2.2 is installed on D drive. I took a look at the httpd.conf file but I couldn't find any references to c: When I look in Apache’s access.log I see 127.0.0.1 - - [26/Sep/2012:00:05:10 +0900] "GET /icons/blank.gif HTTP/1.1" 403 217 127.0.0.1 - - [26/Sep/2012:00:05:10 +0900] "GET /icons/back.gif HTTP/1.1" 403 216 127.0.0.1 - - [26/Sep/2012:00:05:10 +0900] "GET /icons/text.gif HTTP/1.1" 403 216 127.0.0.1 - - [26/Sep/2012:00:05:10 +0900] "GET /icons/unknown.gif HTTP/1.1" 403 219 127.0.0.1 - - [26/Sep/2012:00:05:10 +0900] "GET /icons/folder.gif HTTP/1.1" 403 218 CONFIGURATION Wampserver 2.2 installed on Drive D Apache 2.2.22 PHP 5.4.3 MySQL 5.5.24 Firebug 1.10.3 Firefox 15.0.1

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• How to download source, modify source, recompile and build .deb package?

  - by burnersk

  I have to customize my Apache2 suExec module to ensure some special environment variables getting passed through suExec. How to download the source code form Debian package apache2-suexec, modify suexec.c - safe_env_lst, recompile and build a .deb package again to rollout on the production systems? I tried apt-get source apache2-suexec but didn't found the suexec.c within the occurred apache2-* folder. The altered source code should be like this: static const char *const safe_env_lst[] = { /* variable name starts with */ "HTTP_", "SSL_", /* NEW: Perl debugging variables */ "PERL5OPT=", "PERL5LIB=", "PERLDB_OPTS=", "DBGP_IDEKEY=", /* NEW: FCGI variables */ "FCGI=", "FCGI_CONNECTION=", "FCGI_RUNTIME=", "FCGI_STARTTIME=", draft based on: http://static.askapache.com/httpd/support/suexec.c

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• rsync to EC2 using ssh -i

  - by isomorphismes

  I'm able to ssh -i mykey.pem to EC2. I'm able to scp -i mykey.pem to EC2. But when I try to rsync -avz -e "ssh -i mykey.pem" I get this error: Warning: Identity file mykey.pem not accessible: No such file or directory. Permission denied (publickey). rsync: connection unexpectedly closed (0 bytes received so far) [sender] rsync error: unexplained error (code 255) at io.c(605) [sender=3.0.9] Any suggestions what I've done wrong?

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• MySQL and User level logging

  - by Adraen

  I have been looking at logging only certain users activity in MySQL. I found that the logging could be enabled or disabled for all users but one of the service using the db does a lot of queries and therefore I would like to only log specific users. Google told me that a flag can be SET to enable disable logging, however, I cannot modify the service DB connection code and asking every single user to enable logging before they do anything might not be as reliable as I want. So, do you know if there is any way to log only a set of users queries ? Thanks !

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• postfix says mail sent ok, message does not arrive in ISPs inbox? no reject in log?

  - by Nick

  When I send a test message from my mail server to my @bellsouth.net email, The postfix log shows it was sent OK, but the message never arrives in my bellsouth inbox. Shouldn't I get a failure notice or a bounce if At&T is blocking the messages? I'm trying to troubleshoot why some customers aren't getting emails, but if there's nothing in mail.log to say the message is rejected, how do I know which messages were delivered successfully? The log shows: Feb 27 09:02:36 MyHOSTNAME postfix/pickup[26175]: D53A72713E5: uid=0 from=<root> Feb 27 09:02:36 MyHOSTNAME postfix/cleanup[26487]: D53A72713E5: message-id=<[email protected]> Feb 27 09:02:36 MyHOSTNAME postfix/qmgr[5595]: D53A72713E5: from=<[email protected]>, size=878, nrcpt=1 (queue active) Feb 27 09:02:37 MyHOSTNAME postfix/smtp[26490]: D53A72713E5: to=<[email protected]>, relay=gateway-f1.isp.att.net[204.127.217.16]:25, delay=0.57, delays=0.11/0.03/0.23/0.19, dsn=2.0.0, status=sent (250 ok ; id=20120227140036M0700qer4ne) Feb 27 09:02:37 MyHOSTNAME postfix/qmgr[5595]: D53A72713E5: removed The AT&T server accepted the message, right? I happen to have an At&T/Bellsouth email, but I don't have an account with every ISP we send to. I need some way of knowing if a message is getting to its destination or not. Is there any setting in my main.cf file that would affect whether or not we get reject/bounce notices?

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• How to (hardware) RAID 10 on Ubuntu 10.04 LTS with 4 drives and motherboard with RAID contoller

  - by lollercoaster

  I have 4 500GB hard drives. I set up a RAID 10 in BIOS, much like shown here: http://www.supermicro.com/manuals/other/RAID_SATA_ESB2.pdf Then I followed these instructions: http://www.unrest.ca/Knowledge-Base/configuring-mdadm-raid10-for-ubuntu-910 Basically I cannot get it to work. I go through the instructions when I get to the "partition" section of the install, creating 4 RAID 1's (2 partitions on each drive, one for primary and one for swap space), then combining to make a RAID 10. Unfortunately it still shows 2 partitions, one 500 GB and another being 36GB for some reason. Any ideas? I think best would be if anyone had found good instructions (step by step) for how to do this...I've been googling for hours and haven't found anything...

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• How do you serve php files located outside of the apache folders

  - by Lobe

  I've just installed phpMyAdmin at /usr/share/phpMyAdmin on a CentOS 5 machine running webmin / virtualmin. I have also added an alias to the apache config, being the following line: Alias /phpMyAdmin /usr/share/phpMyAdmin So that when I visit www.foobar.com/phpMyAdmin it serves phpMyAdmin. The problem is that the php is not being parsed, and is instead being spat out with the html which greatly diminishes the usefullness of what I have done. How can I set up apache or php or whatever to parse phpMyAdmin correctly. When googling this I wasn't able to get an understandable answer, however the most common related question was whether I am running mod_php or as CGI. php is running via CGI Thanks

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• Apache, Tomcat 5 and problem with HTTP basic auth

  - by Juha Syrjälä

  I have setup a Tomcat with a webapp that uses http basic auth in some of its URLs. There is a Apache server in front of the Tomcat. I have setup Apache as a proxy like this (all traffic should go directly to tomcat): /etc/httpd/conf.d/proxy_ajp.conf: LoadModule proxy_ajp_module modules/mod_proxy_ajp.so ProxyPass / ajp://localhost:8009/ ProxyPassReverse / ajp://localhost:8009/ There is a webapp installed to root of Tomcat (ROOT.war), so I should be able to use http://localhost/ to access my webapp. But it is not working with http basic auth. The problem is that everything works until I try to access URL that are protected by the HTTP basic auth. URLs without authentication work just fine. When accessing this url via apache I am getting an error message from Apache. If I access the same URL directly from tomcat, everything works just fine. I am getting this to Apache error log: [Wed Sep 01 21:34:01 2010] [error] proxy: dialog to [::1]:8009 (localhost) failed access log looks like this: ::1 - - [01/Sep/2010:21:34:01 +0300] "GET /protected_path/ HTTP/1.0" 503 360 "-" "w3m/0.5.2" I am using: Fedora release 13 (Goddard) httpd-2.2.16-1.fc13.x86_64 tomcat5-5.5.27-7.4.fc12.noarch The basic auth is implemented in the webapp (not in Apache or Tomcat). The webapp is actually implemented in Scala/Lift, but that shouldn't matter. The auth works if I access the tomcat directly. Error message that I am getting from Apache. It is curious that the title is Unauthorized and not Internal error: Unauthorized The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later. Apache/2.2.16 (Fedora) Server at my.server.name.com Port 80 It could be that Apache is seeing a some thing else than 200 OK response and thinks that it is an error when it actually should pass the received 401 Unauthorized response directly to browser. If this is the problem, how to fix it?

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• IIS6 host multiple websites under same sub-domain (or something similar)

  - by user28502

  I'm trying to figure out a structure for a hosted application that i'm working on. I've got a domain lets call it app.company.com (a sub-domain company.com of course) that is setup to redirect to my IIS 6 web server. I would like to set up one website in IIS for each client that will use this application. And have the URL schema be like this: app.company.com/clientA -- would point to ClientA website in IIS app.company.com/clientB -- would point to ClientB website in IIS Do you guys have any pointers or best practices for my scenario?

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• Acer Aspire 7739G-6647 won't connect to the internet

  - by Nux

  Acer Aspire 7739G-6647, it belongs to a family member. I reinstalled the chipset, LAN drivers, ethernet controllers, etc. I'm positive it's not my router or modem or anything like that. I have other laptops running on the network, this one just has some strange issue. For some reason, it's saying "Work Offline" is enabled when I open Windows Media Player, and the PC seems to be connected to the network, but on the graphic in networking, it doesn't show the connection between the network and the internet. Could anyone try to state any possible reason for this issue? Any help is appreciated.

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• Hard Disk Space Changes

  - by Write.

  I am currently running on Windows 7 x64, and have observe that my hard disk space is acting a little weird. Currently, my harddisk has 3 partitions, C:, D:, E:. Previously, before I delete a huge folder (30gb of data) from my D: drive, my C: drive has about 1gb left, while my E: drive has about 5 gb left. After deleting the 30gb of data (from D: drive), my space in D: drive has been recovered (but not sure if it's fully recovered), my C: drive which only had about 1gb left increased to 3. While my E: drive which had 5gb left dropped to 1. I was wondering if it has something to do with the fragmentations and whatsoever I always hear about in harddisk. Has anyone encountered similar issues or have an explanation to why it could be happening?

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• Is there any way for ME to improve routing to an overseas server?

  - by Simon Hartcher

  I am trying to make a connection to a gaming server in Asia from Australia, but my ISP routes my connection through the US. Tracing route to worldoftanks-sea.com [116.51.25.54]over a maximum of 30 hops: 1 <1 ms <1 ms <1 ms 192.168.1.1 2 34 ms 42 ms 45 ms 10.20.21.123 3 40 ms 40 ms 43 ms 202.7.173.145 4 51 ms 42 ms 36 ms syd-sot-ken-crt1-ge-6-0-0.tpgi.com.au [202.7.171.121] 5 175 ms 200 ms 195 ms ge5-0-5d0.cir1.seattle7-wa.us.xo.net [216.156.100.37] 6 212 ms 228 ms 229 ms vb2002.rar3.sanjose-ca.us.xo.net [207.88.13.150] 7 205 ms 204 ms 206 ms 207.88.14.226.ptr.us.xo.net [207.88.14.226] 8 207 ms 215 ms 220 ms xe-0.equinix.snjsca04.us.bb.gin.ntt.net [206.223.116.12] 9 198 ms 201 ms 199 ms ae-7.r20.snjsca04.us.bb.gin.ntt.net [129.250.5.52] 10 396 ms 391 ms 395 ms as-6.r20.sngpsi02.sg.bb.gin.ntt.net [129.250.3.89] 11 383 ms 384 ms 383 ms ae-3.r02.sngpsi02.sg.bb.gin.ntt.net [129.250.4.178] 12 364 ms 381 ms 359 ms wotsg1-slave-54.worldoftanks.sg [116.51.25.54] Trace complete. Since I think it will be unlikely that my ISP will do anything, are there any ways to improve my routing to the server without them having to intervene? NB. The game runs predominately over UDP, so I believe most low ping services are out of the question, as they rely on TCP traffic.

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• Router stopping my python server

  - by drfrev

  This was originally posted in stackoverflow.com but it was suggested I move it here after it was realized it wasn't my code that was wrong. So my problem, very simply, is that I cannot get my computers that are connected to my router to communicate. example: If I ping a wireless computer I get no responce and the Request times out If I ping a computer wired to the modem directly it works fine. When I ping I use the local ip for each case. *if it helps my original post is here: http://stackoverflow.com/questions/12593024/python-cannot-go-over-internet-network/12593361#12593361 And some screen shots of different things are here: http://imgur.com/a/jUZ4G#3 thank you, any help is greatly appreciated. NOTE I am heading off to bed now, so I will respond around 6:00 AM EST if anyone posts some help

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• How can I prevent tmux exiting with Ctrl-d?

  - by Cas

  I use tmux on my server and recently I found to my cost that ctrl-d will exit tmux and lose all the session information, my intention was to simply end the ssh session but failed to notice I was still in tmux until too late. I am aware that I should be careful in future when using ctrl-d but I wondered if there a way to prevent tmux for exiting when hitting ctrl-d by accident? A solution such as a prompt, confirmation or detaching would be fine.

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• I can't externally access my home server's wordpress website

  - by piratepartypumpkin

  Basically, I can access everything just fine using 127.0.0.1, but if I use my external IP (123.123.123.123), I get page not found. My router is port forwarding HTTP port 80 to port 8080 on my servers internal IP address. In other words: (Application: HTTP | Start: 80 | End: 8080 | Protocol: Both | IP Address 192.168.0.101 | Enable [YES]) I know it's forwarding properly, because when I stop port forwarding, I can access my router page by using my external IP. My virtual hosts file is: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /opt/lampstack-5.3.16-0/apps/wordpress ServerName example.com ServerAlias www.example.com </VirtualHost> and my httpd.conf file is: Listen 80 Servername localhost:80 DocumentRoot "/opt/lampstack-5.3.16-0/apache2/htdocs <Directory /> Options FollowSymLinks AllowOverride None Order deny, allow deny from all </Directory> <Directory "/opt/lampstack-5.3.16-0/apache2/htdocs"> Options FollowSymLinks AllowOverride None Order allow, deny allow from all </Directory>

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• Why would the Default Gateway constantly require resetting?

  - by Raven Dreamer

  I've had a (mostly) steady internet connection for the past two months. For the last hour, however, my connectivity has been dropping every 10 minutes or so, and must be reset. So far, I've always been able to fix the issue by running Windows network diagnostics (On Windows 7 64 bit), but the lack of constant internet is making it a pain to try and stream video, download games through steam, etc. Windows always reports a fix by "Resetting the Local Area Connector", telling me: Default Gateway Not Available. What's going on? Is the trouble on my end, or with my ISP? (Timewarner Cable) Things I've Tried: Reinstalling the motherboard's LAN drivers Manually setting a default gateway (gets cleared, reverts to default settings) Unplugged (Hard Reset) the router Unplugged / replugged ethernet cable.

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• Why would ssh fail to expand %h variable in .ssh/config?

  - by Zoran

  Why would ssh fail to expand %h from .ssh/config? This used to work and still works except on a RHEL box. Looking for what the origin of this could be. Is there a setting somewhere that tells ssh to not expand %h? I have something like this in my .ssh/config: Host *.foo HostName %h.mydomain.com On the RHEL box where this doesn't work, I get this: $ ssh -vvvv bar.foo OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010 debug1: Reading configuration data /home/zsimic/.ssh/config debug1: Applying options for *.foo debug1: Applying options for *.foo debug1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 ssh: Could not resolve hostname %h.mydomain.com: Name or service not known

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• Two tor clients

  - by Intellektus

  I have been experimenting with the thought of running two Tor clients at once on my machine. So I decided to try it and modified the source a bit to let me run two clients at once (of course with separate data dirs). But they both get the same exit node, and if I try to switch exit node on one of them via its control port, they both get switched. I have been experimenting with this some more, and Tor always seem to get the same IP, even if I run several separate clients (on the same machine) at once. Is this the expected behavior?

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• Is there any reason to subnet a home network?

  - by Will

  For networks I understand we set a netmask on each computer to let it know what IPs it can talk to without going through the router - IPs on the same subnet can talk directly to each other and do not have to go through a router/switch. However, in today's home networks (and I suspect corporate networks as well) every computer is connected to a router/switch (at the low cost of today's hardware I doubt there it much of a market for wired repeaters/hubs). This seems to obviate the need for a subnet mask and subnetting. Considering that in most modern home architectures every computer goes through the router, even to talk to computers on the same network, is there any reason for me to subnet a home network?

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• Strange performance differences in read/write from/to USB flash drive

  - by Mario De Schaepmeester

  When copying files from my 8GB USB 2.0 flash drive with Windows 7 to a traditional hard drive, the average speed is between 25 and 30 MB/s. When doing the reverse, copying to the USB drive, the speed is 5MB/s average. I have tested this with about 4.5GB of files, a mixture of smaller and larger ones. The observations were the same on both FAT32 and exFAT file systems on the USB drive, NTFS on the internal hard disk. I don't think I can be mistaken in saying that flash memory has a lot higher performance than a spinning hard drive in both terms of reading and writing. For both memory types, reading should be faster than writing too. Now I wonder, how can it be that copying files from a fast read memory to a faster write memory is actually slower than copying files from a fast read memory to a slow write memory? I think that the files are stored in RAM before being copied over too, and there's caching as well, but I don't see how even that could tip the balance. It can only be in the advantage of writing to the USB drive, since it is "closer" to the SATA system than the USB port and it will receive data from the internal SATA HDD faster. Perhaps my way of thinking is all wrong or it just depends on the manufacturer of the USB pen. But I am curious.

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