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• Connection timeout when trying to SSH

  - by dan

  The other day I tried to connect to my remote server via SSH as i always have. But now when I try to connect it just times out after about 60 seconds. I run service ssh start Which tells me that Job is already running: ssh. I then ran $netstat -tnlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 2030/mysqld tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN 2157/perl tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 3028/sshd tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 2273/master tcp6 0 0 :::80 :::* LISTEN 2618/apache2 tcp6 0 0 :::21 :::* LISTEN 2291/proftpd: (acce tcp6 0 0 :::22 :::* LISTEN 3028/sshd I am able to access subdomains on my site, and FTP, but don't have the ability to SSH or even ping remotely. Any thoughts?

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• How to populate RRD database with CPU and MEM usage data?

  - by Tomaszs

  I have a Lighttpd server (on Centos) and would like to display 4 graphs: lighttpd traffic, lighttpd requests per second, CPU usage and MEM usage. I've set place for rrd database for lighttpd config like this: rrdtool.binary = "/usr/bin/rrdtool" rrdtool.db-name = "/var/www/lighttpd.rrd" And put into my WWW cgi-bin sh file that gets data from lighttpd RRD file and creates graphs of traffic and requests per second like this: #!/bin/sh RRDTOOL=/usr/bin/rrdtool OUTDIR=//var/www/graphs INFILE=/var/www/lighttpd.rrd OUTPRE=lighttpd-traffic WIDTH=400 HEIGHT=100 DISP="-v bytes --title TrafficWebserver \ DEF:binraw=$INFILE:InOctets:AVERAGE \ DEF:binmaxraw=$INFILE:InOctets:MAX \ DEF:binminraw=$INFILE:InOctets:MIN \ DEF:bout=$INFILE:OutOctets:AVERAGE \ DEF:boutmax=$INFILE:OutOctets:MAX \ DEF:boutmin=$INFILE:OutOctets:MIN \ CDEF:bin=binraw,-1,* \ CDEF:binmax=binmaxraw,-1,* \ CDEF:binmin=binminraw,-1,* \ CDEF:binminmax=binmaxraw,binminraw,- \ CDEF:boutminmax=boutmax,boutmin,- \ AREA:binmin#ffffff: \ STACK:binmax#f00000: \ LINE1:binmin#a0a0a0: \ LINE1:binmax#a0a0a0: \ LINE2:bin#efb71d:incoming \ GPRINT:bin:MIN:%.2lf \ GPRINT:bin:AVERAGE:%.2lf \ GPRINT:bin:MAX:%.2lf \ AREA:boutmin#ffffff: \ STACK:boutminmax#00f000: \ LINE1:boutmin#a0a0a0: \ LINE1:boutmax#a0a0a0: \ LINE2:bout#a0a735:outgoing \ GPRINT:bout:MIN:%.2lf \ GPRINT:bout:AVERAGE:%.2lf \ GPRINT:bout:MAX:%.2lf \ " $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP -w $WIDTH -h $HEIGHT OUTPRE=lighttpd-requests DISP="-v req --title RequestsperSecond -u 1 \ DEF:req=$INFILE:Requests:AVERAGE \ DEF:reqmax=$INFILE:Requests:MAX \ DEF:reqmin=$INFILE:Requests:MIN \ CDEF:reqminmax=reqmax,reqmin,- \ AREA:reqmin#ffffff: \ STACK:reqminmax#00f000: \ LINE1:reqmin#a0a0a0: \ LINE1:reqmax#a0a0a0: \ LINE2:req#00a735:requests" $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP -w $WIDTH -h $HEIGHT $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP -w $WIDTH -h $HEIGHT Basically it's not my script, i get it from somewhere from the internet. Now i would like to do the same for CPU usage and MEM usage. I don't like to use any additional packages! As you can see lighttpd populates lighttpd.rrd file with traffic data and requests per second. Now i would like to the system to populate second rrd file with CPU and MEM usage, so i can add to sh file code to generate graphs for this data. How can I populate RRD file with CPU and MEM usage data? Please, NO THIRD-PARTY tools !

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• LSI MegaRAID LINUX got Optimal after degradation but strange POST message

  - by kesrut

  Linux server box with LSI MegaRAID controller got degraded. But after some time RAID status changed to Optimal. Adapter 0 -- Virtual Drive Information: Virtual Drive: 0 (Target Id: 0) Name : RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0 Size : 2.727 TB Mirror Data : 2.727 TB State : Optimal Strip Size : 256 KB Number Of Drives per span:2 Span Depth : 3 Default Cache Policy: WriteBack, ReadAdaptive, Cached, No Write Cache if Bad BBU Current Cache Policy: WriteThrough, ReadAdaptive, Cached, No Write Cache if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disk's Default Encryption Type : None Is VD Cached: No But now I'm getting RAID BIOS POST message: Your battery is either charging, bad or missing, and you have VDs configured for write-back mode. Because the battery is not currently usable, these VDs willl actually run in write-through mode until the battery is fully charged or replaced if it is bad or missing. (Image: http://cl.ly/image/1h1O093b1i2d) So may it be battery issue caused problem ? I get information about battery: BatteryType: iBBU Voltage: 4001 mV Current: 0 mA Temperature: 22 C Battery State : Operational BBU Firmware Status: Charging Status : None Voltage : OK Temperature : OK Learn Cycle Requested : No Learn Cycle Active : No Learn Cycle Status : OK Learn Cycle Timeout : No I2c Errors Detected : No Battery Pack Missing : No Battery Replacement required : No Remaining Capacity Low : No Periodic Learn Required : No Transparent Learn : No No space to cache offload : No Pack is about to fail & should be replaced : No Cache Offload premium feature required : No Module microcode update required : No Where can be problem ? I'm disabled alarms, but get them if enabled. But don't know how find root of problem.

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• adding or routing additional domain email addresses

  - by Mustafa Ismail Mustafa

  We have exchange 2007 and we bought a new domain name and we're still keeping the old one so that we can wean everyone off of the old emails. Now, I'm wondering how to go about this. I need to add the new domain as accepted and authoritative by the exchange server. Emails on the new domain need to get routed to the inbox and ditto the old emails, however, I want to be able to change the reply-to in the header to the new email address automatically. I also want to set the new email addresses as the defaults. Ideally, I'd like to be able to add a message at the bottom of every externally outgoing email saying that the new email is [email protected]. But this is a nice to have, certainly not a must have. I've added the new domain as authoritative, and managed to change the primary smtp email addresses to the new one, but sent emails are not being routed to them and neither are the old email addresses! Now how the heck would I go about fixing all of that? I'm completely stumped! TIA

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• php5-mysqlnd on debian wheezy/sid?

  - by Joseph

  I am trying to install php5-mysqlnd on a fresh install of Wheezy (/etc/debian_version refers to it as wheezy/sid) and I'm having a problem: root@debian:/var/www/lottery1# apt-get install php5-mysqlnd Reading package lists... Done Building dependency tree Reading state information... Done php5-mysqlnd is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? Y Setting up php5-mysqlnd (5.4.0-3) ... ucfr: Attempt from package php5-mysqlnd to take /etc/php5/mods-available/mysql.ini away from package php5-mysql ucfr: Aborting. dpkg: error processing php5-mysqlnd (--configure): subprocess installed post-installation script returned error exit status 4 Processing triggers for libapache2-mod-php5 ... configured to not write apport reports Reloading web server config: apache2. Errors were encountered while processing: php5-mysqlnd E: Sub-process /usr/bin/dpkg returned an error code (1) It seems there is some sort of conflict with the php5-mysql package, but I still get this error even after removing (with --purge) the php5-mysql package. Any thoughts? I'm trying to run a web tool that makes heavy use of mysqli_result::fetch_all(). Thanks!

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• Webserver optimization

  - by f-aminov

  Hi guys! I have a website hosted on a VPS (512Mb - minimum guranteed memory, 510Mhz proccessor, Debian 5.0 Lenny, Apache 2.2.9 with nginx 0.7.65 as a frontend to serve static content, MySQL 5.1.44, PHP 5.3.2 with APC caching). I'm a web developer, so I'm not very good at optimizing servers, but I've managed to install and setup all those neccessary components (LAMP, nginx, etc.). After that I decided to stress test my website (which uses Drupal 6.16 with caching and all possible optimization enabled) using a utility called "Webserver Stress Tool 7". And it seems to me that the results aren't any good - here is a graph (sorry, as a new user I'm not allowed to post images) As you can see the response time depending on amount of simultaneous users increases very quickly. With 10 simultaneous users the time is about 1000ms, with 100 simultaneous users it's about 15000ms (15s!). The question is do you think this is normal behavior for such a server or something is wrong with the settings and optimization? If you think something is wrong what particulary could be wrong? Any other suggestion how to speed this a little bit up?

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• Custom flash uploader breaks only on Media Temple

  - by LaserWolf

  I've built a flash uploader to upload files up to 100MB using a php backend. It works wonderfully on our dev server, on a hostgator vps, and on one of our clients' servers running Debian. It will not work on our Media Temple (dv)3.5 and I don't know why. The upload will start but will choke after a few seconds with this flash error message: ioerror: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2038: File I/O Error. URL: http://..._upload.php"] The problem seems to be specific to the asynchronous nature of the flash uploader because if I try a straight php upload it works fine. The php.ini settings are set to allow such a large upload as well. Also, I've thoroughly googled flash, 2038, I/O error, etc but have yet to find anything that helped. Here's the weird part though: We work in Seattle. It won't work from the office. It won't work from home. But, while on the phone with MT's support, they were able to upload a file through our flash uploader just fine. I'm not sure where his office was located but I think it was Atlanta. So the problem also seems specific to physical location. Has anyone run into this sort of problem before?

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• How to make a huge ram drive?

  - by Brandon Moore

  At my old job when a report was needed I could sit down with someone and pull up results and get immediate feedback, and then refine my queries and ultimately have the data we needed, in the format we needed within 30-90 minutes. I just started working for a new company with a database containing millions of records and I spent my whole 8 hours making a report that I feel I could have made in less than 2 hours if it were not for the massive amount of data the queries are working with, and the fact that I couldn't ask the person needing the data to sit down with me and give me feedback as I pulled up results as I am used to. So I am trying to think of how we can make the server faster... much faster, so that I can have the same level of productivity I'm used to. One thought that just came to mind is that memory is so cheap these days, and by my calculations I could buy 10 8gig ram sticks for 1000 bucks. What I have never heard of though is a device that would let me combine these into a huge ram drive. So I'd like to know if any such device exists, and if not what is the largest ram drive I could realistically make and how would I go about doing so? EDIT: To you guys who are saying the database shema needs to be analyzed... you can't make a query such as "Select f1, f2, f3, etc from SomeTable" run any faster by normalizing or indexing the table. What I'm talking about IS ABSOLUTELY a need for improved performance at the hardware level. I am used to having results come back to me in a few seconds, not a few minutes or much less a half an hour. Maybe that's what you guys are used to who have 100 billion record tables and you feel like that's fast, but I'm looking for results back from tables with about 10 million records to come back to me withing less than half a minute TOPS.

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• Mysql, SSL and java client problem

  - by CarlosH

  I'm trying to connect to an SSL-enabled mysql server from my own java application. After setting up ssl on mysqld, and successfuly tested an account using "REQUIRE ISSUER and SUBJECT", I wanted to use that account in a java app. I've generated a private key (to a file called keystore.jks) and csr using keytool, and signed the csr using my own CA(The same used with mysqld and its certificate). Once signed the csr, I've imported the CA and client cert into the keystore.jks file. When running the application the SSL connection can't be established. Relevant logs: ... [Raw read]: length = 5 0000: 16 00 00 02 FF ..... main, handling exception: javax.net.ssl.SSLException: Unsupported record version Unknown-0.0 main, SEND TLSv1 ALERT: fatal, description = unexpected_message Padded plaintext before ENCRYPTION: len = 32 0000: 02 0A BE 0F AD 64 0E 9A 32 3B FE 76 EF 40 A4 C9 .....d..2;.v.@.. 0010: B4 A7 F3 25 E7 E5 09 09 09 09 09 09 09 09 09 09 ...%............ main, WRITE: TLSv1 Alert, length = 32 [Raw write]: length = 37 0000: 15 03 01 00 20 AB 41 9E 37 F4 B8 44 A7 FD 91 B1 .... .A.7..D.... 0010: 75 5A 42 C6 70 BF D4 DC EC 83 01 0C CF 64 C7 36 uZB.p........d.6 0020: 2F 69 EC D2 7F /i... main, called closeSocket() main, called close() main, called closeInternal(true) main, called close() main, called closeInternal(true) connection error com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Any idea why is this happening?

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• Backup with Mercurial and Robocopy?

  - by Andrew Neely

  The Problem We would like to backup our critical files from several network shares to a removable hard drive. We want to automate the backup so we don't have to remember to run it. It needs to finish overnight. Furthermore, we want to be able to preserve multiple versions of each file so we can back out of our user's mistakes easier. Background Information I work in a large Windows-based enterprise with a centralized IT section who is responsible for all backups. Their backups are geared towards disaster recovery and not user error, and require upper-level management approval for any non-disaster recoveries. Several times we have noticed that our backups have failed, we weren't notified. I do not have administrative rights to the server or my desktop. We are trying to backup some 198,000 files spanning about 240 gigabytes. These files rarely change. Our backup drive is one terabyte. My Proposed Solution What I would like to do is to write a batch file using Robocopy with the /mir option along with Mercurial SCM to store all versions of the file. I would do an hg add followed by an hg commit before each execution of Robocopy to save the current state, and then make a mirrored copy of the file structures. The problem is the /mir will delete every folder not present in the source, and Mercurial stores the repository in a .hg folder in the destination folder. Does anybody know how I could either convince Mercurial to store the .hg folder elsewhere, or convince Robocopy not to delete it from the destination? I'm trying to avoid writing a custom program do to copying.

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• Folder Redirection/Offline Files on Win 7 | Folders are empty when not connected to the domain

  - by Matt

  I've been struggling with this issue for days and cannot seem to find anyone else with a similar issue. I will note first that I have tried using both roaming profiles and the group policy setting for force local profiles.... now onto the problem. What I am trying to do is have my teachers accounts log onto their laptops using their domain credentials. Once logged in their desktop and documents are redirected to a network share //server/redirects/documents/. This works fine when the computer is connected to the domain network. Offline File Sync works great and caches the files locally. However this all breaks down when the user logs in when the computer is no longer connected to the domain network. When the user logs in the desktop and documents are empty. What I find very odd is if I manually go to the offline file folder all of the files are there, The group policy folder redirection does not execute to the offline folder. Is this by Design? (It does not work like this on Vista, I have the exact same group policy settings set on vista machines and it works flawlessly). Additional Info When I look at the event log there is no folder redirection events at all when user logs in and is not connected to the network. In addition a new profile is create in c:/users/username.domain.00x. Every log in creates an additional profile. There is a event that states that a registry files were still in use. Any help would be appreciated.

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• Will adding a SSD cache device to my ZFS storage improve performance?

  - by Sysadminicus

  The server has 4GB of RAM and my zpool is made up of 15.5k SAS drives arranged like this: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c0t2d0 ONLINE 0 0 0 c0t3d0 ONLINE 0 0 0 c0t4d0 ONLINE 0 0 0 c0t5d0 ONLINE 0 0 0 c0t6d0 ONLINE 0 0 0 c0t7d0 ONLINE 0 0 0 c0t8d0 ONLINE 0 0 0 raidz1-1 ONLINE 0 0 0 c0t10d0 ONLINE 0 0 0 c0t11d0 ONLINE 0 0 0 c0t12d0 ONLINE 0 0 0 c0t13d0 ONLINE 0 0 0 c0t14d0 ONLINE 0 0 0 spares c0t9d0 AVAIL c0t1d0 AVAIL The primary use is as an NFS store for a couple VMWare ESXi servers. I can't do any "true" benchmarks because this is a production system (no budget for test systems), but using dd and bonnie++ I can't get more than ~40-50MB/s writes and ~70-90MB/s reads. It seems I should be able to do much better, but I'm not sure where to optimize. Based on what I've read, I think dropping in a OCZ Vertex 2 Pro SSD as my L2ARC is going to be the best bang-for-the-buck to improve througput. Is there something else I should be looking into to help performance? If not... How do I know how big a cache device I need? Am I safe with only a single SSD as my cache device?

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• CentOS security for lazy admins

  - by Robby75

  I'm running CentOS 5.5 (basic LAMP with Parallels Power Panel and Plesk) and have thus far neglected security (because it's not my full-time job, there is always something more important on my todo-list). My server does not contain any secret data and also no lives depend on it - Basically what I want is to make sure it does not become part of a botnet, that is "good enough" security in my case. Anyway, I don't want to become a full-time paranoid admin (like constantly watching and patching everything because of some obscure problem), I also don't care about most security problems like DOS attacks or problems that only exist when using some arcane settings. I'm in search of a "happy medium", for example a list of known important problems in the default installation of CentOS 5.5 and/or a list of security problems that have actually been exploited - not the typical endless list of buffer overflows that "maybe" a problem in some special case. The problem that I have with the usually recommended approaches (joining mailing lists, etc.) is that the really important problems (something where an exploit exists, that is exploitable in a common setup and where the attacker can do something really useful - i.e. not a DOS) are completely and utterly swamped by millions of tiny security alerts that surely are important for high-security servers, but not for me. Thanks for all suggestions!

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• Running Upstart user jobs on startup

  - by dgel

  I am running Ubuntu server 11.04. I have created an Upstart user job as described here. I have the following file at my /home/myuser/.init/sensors.conf: start on started mysql stop on stopping mysql chdir /home/myuser/mydir/project exec /home/myuser/mydir/env/bin/python /home/myuser/mydir/project/manage.py sensors respawn respawn limit 10 90 As myuser I can start, stop, and reload the job fine- it works perfectly: $ start sensors sensors start/running, process 1332 $ stop sensors sensors stop/waiting The problem is that the job is not starting automatically at boot when mysql starts. After a fresh boot, mysql is running but my sensors job is not. What's strange, is that although the job doesn't begin on bootup, if I use sudo to restart mysql it does indeed start my job. The following commands are run as myuser from a fresh startup: $ status sensors sensors stop/waiting $ sudo restart mysql mysql start/running, process 1209 $ status sensors sensors start/running, process 1229 The documentation for Upstart user jobs is pretty limited. What is the correct technique to have a user job start automatically on startup of the system? I know I can just throw something in rc.local to start it, or I could move my sensors.conf to /etc/init but I'm curious if there is a way to do it using just Upstart.

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• Deploying workstations - best practices?

  - by V. Romanov

  Hi guys I've been researching on the subject of workstation deployment for a while, and found a ton of info and dozens different methods and tools, but no "best practice" method that doesn't lack at least one feature that i consider required for the solution to be perfect. I'm currently interested in windows workstation deployment, but if the tools can be extended to Linux, then it's an added value. I want the deployment tools I use to be able to do the following: hardware independent - I want my image or installation to have a minimum of hardware and driver dependency, so that i can use a single image/package for all workstations easily updatable - I want to be able to update my image as easily as possible without redeploying/rebuilding/reimaging all configurations PXE bootable deployment - I want the tools to be bootable off the network so that I don't need a boot cd/DOK. scriptable for minimum human input - Ideally, the tool should run automatically after being booted and perform a "default" deployment (including partitioning) unless prompted otherwise. i.e - take a pc, hook it up, power on, PXE boot and forget about it until the OS is deployed. I found no single product or environment that does all this. Closest i came to is the windows deployment services/WIM image format. I also checked out numerous imaging and deployment tools including clonezilla, ghost, g4u, wpkg and others, but most of them lack the hardware Independence and updatability features. We currently have a Symantec Ghost server setup that does imaging over the network, but I'm not satisfied with it as it has all the drawbacks i listed above. Do you have suggestions how to optimize the process of workstation deployment? How do you deploy them in your organization? Thanks! Vadim.

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• Object Not found - Apache Rewrite issue

  - by Chris J. Lee

  I'm pretty new to setting up apache locally with xampp. I'm trying to develop locally with xampp (Ubuntu 11.04) linux 1.7.4 for a Drupal Site. I've actually git pulled an exact copy of this drupal site from another testing server hosted at MediaTemple. Issue I'll visit my local development environment virtualhost (http://bbk.loc) and the front page renders correctly with no errors from drupal or apache. The issue is the subsequent pages don't return an "Object not found" Error from apache. What is more bizarre is when I add various query strings and the pages are found (like http://bbk.loc?p=user). VHost file NameVirtualHost bbk.loc:* <Directory "/home/chris/workspace/bbk/html"> Options Indexes Includes execCGI AllowOverride None Order Allow,Deny Allow From All </Directory> <VirtualHost bbk.loc> DocumentRoot /home/chris/workspace/bbk/html ServerName bbk.loc ErrorLog logs/bbk.error </VirtualHost> BBK.error Error Log File: [Mon Jun 27 10:08:58 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/node, referer: http://bbk.loc/ [Mon Jun 27 10:21:48 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/sites/all/themes/bbk/logo.png, referer: http://bbk.$ [Mon Jun 27 10:21:51 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/node, referer: http://bbk.loc/ Actions I've taken: Move Rewrite module loading to load before cache module http://drupal.org/node/43545 Verify modrewrite works with .htaccess file Any ideas why mod_rewrite might not be working?

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• RabbitMQ message consumers stop consuming messages

  - by Bruno Thomas

  Hi server fault, Our team is in a spike sprint to choose between ActiveMQ or RabbitMQ. We made 2 little producer/consumer spikes sending an object message with an array of 16 strings, a timestamp, and 2 integers. The spikes are ok on our devs machines (messages are well consumed). Then came the benchs. We first noticed that somtimes, on our machines, when we were sending a lot of messages the consumer was sometimes hanging. It was there, but the messsages were accumulating in the queue. When we went on the bench plateform : cluster of 2 rabbitmq machines 4 cores/3.2Ghz, 4Gb RAM, load balanced by a VIP one to 6 consumers running on the rabbitmq machines, saving the messages in a mysql DB (same type of machine for the DB) 12 producers running on 12 AS machines (tomcat), attacked with jmeter running on another machine. The load is about 600 to 700 http request per second, on the servlets that produces the same load of RabbitMQ messages. We noticed that sometimes, consumers hang (well, they are not blocked, but they dont consume messages anymore). We can see that because each consumer save around 100 msg/sec in database, so when one is stopping consumming, the overall messages saved per seconds in DB fall down with the same ratio (if let say 3 consumers stop, we fall around 600 msg/sec to 300 msg/sec). During that time, the producers are ok, and still produce at the jmeter rate (around 600 msg/sec). The messages are in the queues and taken by the consumers still "alive". We load all the servlets with the producers first, then launch all the consumers one by one, checking if the connexions are ok, then run jmeter. We are sending messages to one direct exchange. All consumers are listening to one persistent queue bounded to the exchange. That point is major for our choice. Have you seen this with rabbitmq, do you have an idea of what is going on ? Thank you for your answers.

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• CentOS networking BNX2

  - by james moore

  Having some trouble with my NICs. The server starts fine and I can wget/ping etc. However, when I /etc/init.d/networking restart I then receive the following error: Bringing up interface eth0: bnx2: fw sync timeout, reset code = 1030009 SIOCSIFFLAGS: Device or resource busy Consequently, the task fails. I have searched around on google users suggesting to disable PNP in the BIOS but I see no option. Here is some system information: $ ethtool -i eth0 driver: bnx2 version: 2.0.8-rh firmware-version: bc 2.9.1 $ uname -a Linux host 2.6.18-238.9.1.el5 #1 SMP Tue Apr 12 18:10:13 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux $/sbin/lspci | grep Broadcom 04:00.0 PCI brodge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3) 05:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5700 Gigabit Ethernet (rev 12) 08:00.0 PCI brodge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3) 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5700 Gigabit Ethernet (rev 12) $ lsmod | grep bnx2 bnx2i 81704 0 cnic 109512 1 bnx2i libiscsi2 77765 6 be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi_tcp scsi_transport_iscsi2 73945 8 be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi2 bnx2 224780 0 scsi_mod 199001 15 mpt2sas,scsi_transport_sas,mptctl,be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi2,scsi_transport_iscsi2,scsi_dh,sg,libata,megaraid_sas,sd_mod $ rmmod bnx2; modprobe bnx2 PCI: Enabling device 0000:05:00.0 (0158 -> 015a) PCI: Enabling device 0000:09:00.0 (0158 -> 015a) bnx2: fw sync timeout, reset code = 10300003 Any help would be appreciated as I am at a loss.

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• MySQL Cluster ndb_mgmd error

  - by Patryk

  I set up MySQL Cluster on Ubuntu. My ndb_mgmd.cnf file looked: [NDBD DEFAULT] NoOfReplicas=2 DataDir= /var/lib/mysql-cluster # Management Node [NDB_MGMD] NodeId=1 HostName=192.168.204.20 DataDir=/var/lib/mysql-cluster # Storage Nodes (one for each node) [NDBD] NodeId=2 HostName=192.168.204.25 DataDir=/var/lib/mysql-cluster [NDBD] NodeId=3 HostName=192.168.204.26 DataDir=/var/lib/mysql-cluster # SQL Nodes (one for each node) [MYSQLD] NodeId=4 HostName=192.168.204.30 Now I want to edit this configuration, so I changed this file: [NDBD DEFAULT] NoOfReplicas=2 DataDir= /var/lib/mysql-cluster # Management Node [NDB_MGMD] NodeId=1 HostName=192.168.204.20 DataDir=/var/lib/mysql-cluster # Storage Nodes (one for each node) [NDBD] NodeId=2 HostName=192.168.204.25 DataDir=/var/lib/mysql-cluster [NDBD] NodeId=3 HostName=192.168.204.26 DataDir=/var/lib/mysql-cluster # SQL Nodes (one for each node) [MYSQLD] NodeId=4 HostName=192.168.204.25 [MYSQLD] NodeId=5 HostName=192.168.204.26 But ndb_mgm > show; still shows: Connected to Management Server at: localhost:1186 Cluster Configuration --------------------- [ndbd(NDB)] 2 node(s) id=2 (not connected, accepting connect from 192.168.204.25) id=3 (not connected, accepting connect from 192.168.204.26) [ndb_mgmd(MGM)] 1 node(s) id=1 @192.168.204.20 (mysql-5.1.51 ndb-7.1.9) [mysqld(API)] 1 node(s) id=4 (not connected, accepting connect from 192.168.204.30) I tried: sudo /etc/init.d/mysql-ndb-mgm restart sudo ndb_mgmd --initial sudo ndb_mgmd -f /etc/mysql/ndb_mgmd.cnf And nothing works. Any help?

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• Linux Scheduler (not using all cores on multi-core machine) RHEL6

  - by User512

  I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include <unistd.h> #include <stdlib.h> void RunClient(int i) { printf("Starting client %d\n", i); while (true) { } } int main(int argc, char** argv) { for (int i = 0; i < 4; ++i) { pid_t p_id = fork(); if (p_id == -1) { perror("fork"); } else if (p_id == 0) { RunClient(i); exit(0); } } return 0; } This machine has a lot more than 4 cores so we'd expect all processes to be running at 100%. When I check on top, the cpu usage varies. Sometimes it's split (100%, 33%, 33%, 33%), other times it's split (100%, 100%, 50%, 50%). When I try this test on another server of ours (running RHEL 5), there are no issues (it's 100%, 100%, 100%, 100%) as expected. What's causing this and how can I fix it? Thanks

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• Tracking Security Vulnerability remediation

  - by Zypher

  I've been looking into this for a little while, but havn't really found anything suitable. What I am looking for is a system to track security vulnerability remdiation status. Something like "bugzilla for IT" What I am looking for is something pretty simple that allows the following: batch entry of new vulnerabilities that need to be remediated Per user assignment AD/LDAP Authentiation Simple interface to track progress - research, change control status, remediated, etc. Historical search ability Ability to divide by division Ability to store proof of resolution for the Security Team to access Dependency tracking Linux based is best (that's my group :) ) Free is good, but cost doesn't matter so much if the system is worth it The systems doesn't have to have all of these features, but if it did that would be great. yes we could use our helpdesk software, but that has a bunch of pitfalls such as triggering SLA alerts and penalties as well as not easily searchable outside of a group. Most of what I have found are bug tracking systems that are geared towards developers, and are honstely way overkill for what I am looking for. Server Faults input is greatly appreciated as always!

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• Files on ext4 on Drobo with corrupt, zero-ed out blocks

  - by Patrick

  I have a 2TB ext4 file system (Ubuntu running Linux kernel 2.6.31-22-server x86_64). This file system is the second drive on a Drobo box plugged in via USB. We've not had problems on the first drive (Drobo limits drive size to 2TB due to some OS limitations, so if you have more space than that it appears as two separate drives). I am sharing this files with Samba (smbd 3.4.0) with a mix of Windows and Linux workstations. Recently we've been experiencing some data corruption in multiple files. In many cases I have an un-corrupt original file stored on one of the workstations. These are binary files of various formats, (e.g. SQLite, but others as well). I used "split" to split a corrupt and uncorrupt file into 4096 byte chunks (this is the block size of the ext4 file system). I then ran md5sum on pairs of chunks and discovered that the chunks matched in many cases and in every case where they did not match, the corrupt chunk was a solid chunk of zeroes (620f0b67a91f7f74151bc5be745b7110 for what it's worth). I'm trying to track down a culprit but am a bit at a loss. I don't believe Samba is at fault since I'm using it without issue on the first drive exported by the Drobo. What can I do to narrow this down and find out what's going on?

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• Postfix Problem (helo/hostname mismatch)!

  - by CuSS

  Hi all, I have a server, and it is running a error for one email only (all other mails in that domain are working). How can i fix it? (The error is above:) May 17 11:43:56 webserver postfix/policyd-weight[5596]: weighted check: IN_DYN_PBL_SPAMHAUS=3.25 NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 DSBL_ORG=ERR(0) CL_IP_NE_HELO=4.75 RESOLVED_IP_IS_NOT_HELO=1.5 HELO_NUMERIC=10.625 (check from: .eticagest. - helo: .[10.0.0.17]. - helo-domain: .17].) FROM_NOT_FAILED_HELO(DOMAIN)=6.25; <client=188.80.139.211> <helo=[10.0.0.17]> <[email protected]> <[email protected]>; rate: 21.875 May 17 11:43:56 webserver postfix/policyd-weight[5596]: decided action=550 Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: [10.0.0.17], MTA hostname: bl15-139-211.dsl.telepac.pt[188.80.139.211] (helo/hostname mismatch); <client=188.80.139.211> <helo=[10.0.0.17]> <[email protected]> <[email protected]>; delay: 6s

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• PostgreSQL 8.4 - Tablespace Optimization

  - by FloE

  I'm currently running a PostgreSQL Database with about 1.5 billion rows / 500 GB of data (including indices). There are several schemata: on for the (read only, irregular changes / updates) 'core-model' and one for every user (about 20 persons). The users can access the core and store data in their own schema, so everything is located in one database. The server runs with CentOS and PostgreSQL 8.4 and is used for scientific studies, exploration etc and is running quite well. These days an upgrade of the DB storage hard disks arrive - all with the same performance as the old ones. I'm looking for the best way to distribute the data on these disks. It would be possible to separate frequently used objects (the core-data) from the user schemata, but I'm not sure if this is really worth the effort. It seems to be a much better idea to move the WAL files (pg_xlog directory) to its own partition. http://www.postgresql.org/docs/8.4/static/wal-internals.html What are your opinions? Are there any tablespace- or partitioning-related performance documentations / benchmarks?

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• uWSGI cannot find "application" using Flask and Virtualenv

  - by skyler

  Using uWSGI to serve a simple wsgi app, (a simple "Hello, World") my configuration works, but when I try to run a Flask app, I get this in uWSGI's error logs: current working directory: /opt/python-env/coefficient/lib/python2.6/site-packages writing pidfile to /var/run/uwsgi.pid detected binary path: /opt/uwsgi/uwsgi setuid() to 497 your memory page size is 4096 bytes detected max file descriptor number: 1024 lock engine: pthread robust mutexes uwsgi socket 0 bound to TCP address 127.0.0.1:3031 fd 3 Python version: 2.6.6 (r266:84292, Jun 18 2012, 14:18:47) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] Set PythonHome to /opt/python-env/coefficient/ *** Python threads support is disabled. You can enable it with --enable-threads *** Python main interpreter initialized at 0xbed3b0 your server socket listen backlog is limited to 100 connections *** Operational MODE: single process *** added /opt/python-env/coefficient/lib/python2.6/site-packages/ to pythonpath. unable to find "application" callable in file /var/www/coefficient/flask.py unable to load app 0 (mountpoint='') (callable not found or import error) *** no app loaded. going in full dynamic mode *** *** uWSGI is running in multiple interpreter mode ***` Note in particular this part of the log: unable to find "application" callable in file /var/www/coefficient/flask.py unable to load app 0 (mountpoint='') (callable not found or import error) **no app loaded. going in full dynamic mode** This is my Flask app: from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello, World, from Flask!" Before I added my Virtualenv's pythonpath to my configuration file, I was getting an ImportError for Flask. I solved this though, I believe (I'm not receiving errors about it anymore) and here is my complete configuration file: uwsgi: #socket: /tmp/uwsgi.sock socket: 127.0.0.1:3031 daemonize: /var/log/uwsgi.log pidfile: /var/run/uwsgi.pid master: true vacuum: true #wsgi-file: /var/www/coefficient/coefficient.py wsgi-file: /var/www/coefficient/flask.py processes: 1 virtualenv: /opt/python-env/coefficient/ pythonpath: /opt/python-env/coefficient/lib/python2.6/site-packages This is how I start uWSGI, from an rc script: /opt/uwsgi/uwsgi --yaml /etc/uwsgi/conf.yaml --uid uwsgi And if I try to view the Flask program in a browser, I get this: **uWSGI Error** Python application not found Any help is appreciated.

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