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• Configure Nagios To Alert Depending On Host Group That Service Alert Originates From

  - by StrangeWill

  So my setup: Services are shared between all hosts (CPU/RAM/Disk/Services). Hosts are split into two main groups: "Production" and "Development". We have two contact groups: "Production" and "Development". Lets say my development SQL server runs low on RAM, I want it to only alert those in "Development" contact group (this service is of course assigned to a host in the "Development" host group, using the shared RAM monitoring service). I'm pretty much stumped on this... I can't configure it at the service level (they're shared there), and I can't seem to get escalations to do it for me either... Do I need to use service groups along with escalations and bite the bullet on building that list? Or am I missing something stupidly simple? I'm using Centreon for configuration if that helps.

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• Double default gateway ubuntu server

  - by Elena

  I've just installed an Ubuntu server 9.10 on an EEEBox. This is my /etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback auto wlan0 iface wlan0 inet static address 192.168.48.16 netmask 255.255.248.0 wireless-essid mynet auto eth0 iface eth0 inet static address xx.xx.xx.xx netmask 255.255.255.224 gateway xx.xx.yy.yy When I restart /etc/init.d/networking, I can access the eth0 ip address from the internet and I can ping the machines in my wifi network mynet. Everything works fine and I have one default gateway. But after some time if I check again the route I just find two default gateways: one is correct and is the previous one, but the other is the one of the wifi network. I have a quite low signal of mynet where my server is and sometimes the wifi just disconnect and then reconnect again. Then I think that this can be a problem and the dhcp of the wifi net, when reconnecting it also add a default gateway. Any idea on how to resolve this issue?

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• Why is this LTO4 Tape-drive not working

  - by Tim Haegele

  # modprobe mptsas # dmesg [ 4274.796796] scsi target7:0:0: mptsas: ioc1: delete device: fw_channel 0, fw_id 0, phy 0, sas_addr 0x50050763124b29ac [ 4274.939579] mptsas 0000:01:00.0: PCI INT A disabled [ 4280.934531] Fusion MPT SAS Host driver 3.04.12 [ 4280.934552] mptsas 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 4280.934692] mptbase: ioc2: Initiating bringup [ 4281.490183] ioc2: LSISAS1064E B3: Capabilities={Initiator} [ 4281.490203] mptsas 0000:01:00.0: setting latency timer to 64 [ 4293.555274] scsi8 : ioc2: LSISAS1064E B3, FwRev=011e0000h, Ports=1, MaxQ=277, IRQ=16 [ 4293.574906] mptsas: ioc2: attaching ssp device: fw_channel 0, fw_id 0, phy 0, sas_addr 0x50050763124b29ac [ 4293.576471] scsi 8:0:0:0: Sequential-Access IBM ULTRIUM-HH4 B6W1 PQ: 0 ANSI: 6 [ 4293.578549] st 8:0:0:0: Attached scsi tape st0 [ 4293.578550] st 8:0:0:0: st0: try direct i/o: yes (alignment 512 B) [ 4293.578577] st 8:0:0:0: Attached scsi generic sg5 type 1 # mt -f /dev/st0 status mt -f /dev/st0 status mt: /dev/st0: rmtopen failed: Input/output error # dd if=/dev/zero of=/dev/nst0 bs=1024 count=10 dd: opening `/dev/nst0': Input/output error I am running debian squeeze 2.6.32-5-amd64 #1 SMP Sun May 6 04:00:17 UTC 2012 x86_64 GNU/Linux Server is Fujitsu TX140 with Controller Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS Tape+Hardware is new.

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• how to best config for synflood setup in csf but web response still fast

  - by Binh Nguyen

  my server down random every day 4-5 time cause get high load very quick.. I have install csf and with some config server now stable.. load around 5. BUT the big isuse is : the real user very hard to access website specially from IE browser you can test at xaluan.com the flowing is config using in csf: SYNFLOOD = "1" SYNFLOOD_RATE = "100/s" SYNFLOOD_BURST = "10" CONNLIMIT = "80;30" PORTFLOOD = "80;tcp;70;5" CT_LIMIT = "29" # other config may same as default i playing around with this config for a week but still not work around.. If increase the rate SYNFLOOD_RATE = "140/s" or more.. the website response very fast.. be side have bad effect of server load increase so fast normal 20 and may be up to few hundred in peck time .. my need is response time fast but load still low.. please help thanks ps: server runing nginx frontend, apache, mysql, php ,, the home page has around 70 elements which will cached in browser in fist time access..

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• graphics-card makes sound-card produce a buzzing sound

  - by Markus von Broady

  Recently I bought a new GPU: GeForce GTX 550 Ti, and after installing it I get a strange buzzing sound. It's not always there, just sometimes (mostly when I open some game, but sometimes also in browsers etc.). It's not a capacitor or a fan, as unplugging speakers from sound-card makes the 'bzzzzzzz' go away. However, muting windows doesn't mute this sound. I'm pretty sure it is fault of the new GPU, but how is this happening and can I fix it? Can it be a low power supply? I thought of buying a stronger unit, but as everything works, and computer doesn't shut down, I hesitate.

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• Slab uses 88Gb of 128Gb available. What could cause this?

  - by Joris Meys

  We run a debian 2.6.26-2-amd64 x86_64 GNU/Linux on a server with 128 Gb. Recently it our available memory became rather low. Looking at the /proc/meminfo showed that the Slab was using 88Gb, which is counted in the used memory off course. Is this a problem? I suspect that memory will be freed when necessary, but I don't know if that could have unwanted side effects. Why would Slab need that much memory? Is there a clear cause for that? can we avoid this to happen in the future? How can we free this memory? thank you in advance > cat /proc/meminfo MemTotal: 132304500 kB MemFree: 26669388 kB Buffers: 237504 kB Cached: 11881136 kB SwapCached: 48 kB Active: 5244640 kB Inactive: 11714308 kB SwapTotal: 5751228 kB SwapFree: 5750436 kB Dirty: 24 kB Writeback: 0 kB AnonPages: 4840256 kB Mapped: 163968 kB Slab: 88314840 kB SReclaimable: 88275644 kB SUnreclaim: 39196 kB PageTables: 80852 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 71903476 kB Committed_AS: 6818332 kB VmallocTotal: 34359738367 kB VmallocUsed: 505724 kB VmallocChunk: 34359231963 kB

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• Server Configuration / Important Parameter for 500Req/Second

  - by Sparsh Gupta

  I am configuring a server to be used as nginx server for a very heavy traffic website. It is expected to receive traffic from a large number of IP addresses simultaneously. It is expected to get 500Req/Second with atleast 20Million unique IPs connecting it. One of the problems I noticed in my previos server was related to iptables / ipconntrack. I am not aware of this behaviour and would be glad to know which all parameters of a ubuntu / debian (32/64) bit machine should I tweek to get maximum performance from the server. I can put in a lot of RAM on the server but mission critical task is the response times. We ideally dont want any connection to be hanging / timing out / waiting and want as low as possible overall response times. P.S. We are also looking for a kick ass freelancer system admin who can help us figuring / setting this all up. Reach me incase you have some spare time and interested in working on some very heavy traffic website servers.

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• Postfix SMTP server down on Ubuntu

  - by Paddington

  I have a Plesk server running Postfix on Ubuntu 10.04 and the SMTP service on port 25 is down. When I stop and then start postfix the server comes up only for a minute and goes down again. I have checked the load on the server and it is low as shown: *top - 04:29:33 up 19 days, 3:25, 4 users, load average: 1.47, 1.78, 2.34 Tasks: 936 total, 1 running, 935 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.3%sy, 0.0%ni, 86.6%id, 11.7%wa, 0.6%hi, 0.1%si, 0.0%st Mem: 6110496k total, 6072988k used, 37508k free, 251244k buffers Swap: 12000544k total, 95264k used, 11905280k free, 4370432k cached* IMAP clients are not experiencing a problem and there are no issues with receiving emails for both POP or IMAP. Only SMTP (port 25) is a problem. If I ask clients to use the submission port (587) messages are delivered. netstat -lnt shows the following results , so its not a port issue. tcp 0 0 0.0.0.0:25 0.0.0.0: LISTEN tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN*

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• page allocation failure - am I running out of memory?

  - by mfriedman

  Lately I've noticing entries like this one in the kern.log of one of my servers: Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20 This is what I'd like to know: What exactly does that message mean? Is my server running out of memory? The swap usage is quite low (less than 10%), and so far I haven't noticed any processes being killed because of lack of memory. Additional information: The server is a Xen instance (DomU) running Debian 6.0 It has 512 MB of RAM and a 512 MB swap partition CPU load inside the virtual machine shows an average of 0.25

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• How to change the fonts used in Foxit Reader?

  - by user982438

  I really want to use Foxit Reader as my default PDF reader for its Tab Interface, and low memory footprint. Having tried mutiple times over the years the only thing that is stopping me are the Fonts. PDF in Adobe Reader looks Regular, but PDF Rendered in Foxit Looks Ugly. Would this solution works in Chrome as well? Since i record Chrome is using Foxit Reader as its embedded PDF engine. And is there any reasons why Fonts are used differently in Adobe and Foxit Reader?

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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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• Need help trouble shooting Https webserver error - SSL Handshake failed

  - by DerNalia

  I followed this guide: http://hints.macworld.com/article.php?story=20041129143420344 Here is my virtual host definition <VirtualHost *:443> SSLEngine on SSLProxyEngine On RequestHeader set Front-End-Https "On" CacheDisable * SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL DocumentRoot "/Users/me/projects/myproject/public" ServerName ssl.mydomain.com ServerAlias *.ssl.mydomain.com SSLCertificateKeyFile "/private/etc/apache2/certs/webserver.nopass.key" SSLCertificateFile "/private/etc/apache2/certs/newcert.pem" SSLCACertificateFile "/private/etc/apache2/certs/demoCA/cacert.pem" SSLCARevocationPath "/private/etc/apache2/certs/demoCA/crl" ErrorLog "/Users/me/Desktop/ssl.log" ProxyPass / https://localhost:3002/ ProxyPassReverse / https://localhost:3002 ProxyPreserveHost on </VirtualHost> And when I try connecting to the sevre viov the web browser, I get this error: [Thu Feb 02 16:50:40 2012] [error] (502)Unknown error: 502: proxy: pass request body failed to 127.0.0.1:3002 (localhost) [Thu Feb 02 16:50:40 2012] [error] [client 96.11.81.39] proxy: Error during SSL Handshake with remote server returned by /session/new [Thu Feb 02 16:50:40 2012] [error] proxy: pass request body failed to 127.0.0.1:3002 (localhost) from 96.11.81.39 () how do I debug / fix this?

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• Nginx & Passenger - failed (11: Resource temporarily unavailable) while connecting to upstream

  - by Toby Hede

  I have an Nginx and Passenger setup that is proving problematic. At relatively low loads the server seems to get backed up and start churning results like this into the error.log: connect() to unix:/passenger_helper_server failed (11: Resource temporarily unavailable) while connecting to upstream My passenger setup is: passenger_min_instances 2; passenger_pool_idle_time 1200; passenger_max_pool_size 20; I have done some digging, and it looks like the CPU gets pegged. Memory usage seems fine passenger_memory_stats shows at most about 700MB being used, but CPU approaches 100%. is this enough to cause this type of error? Should i bring the pool size down? Are there other configuration settings I should be looking at? Any help appreciated Other pertinent information: Amazon EC2 Small Instance Ubuntu 10.10 Nginx (latest stable) Passenger (latest stable) Rails 3.0.4

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• "No more PTYs" when trying to start screen

  - by Attila Oláh

  When I try to start 'screen' or 'byobu', I get the following error message: $ screen No more PTYs. Sorry, could not find a PTY. [screen is terminating] I seem to have enough though: $ ls /dev/pts $ cat /proc/sys/kernel/pty/nr 0 $ cat /proc/sys/kernel/pty/max 4096 Some more info: $ uname -a Linux cube.mydedi.net 2.6.18-194.8.1.el5.028stab070.5 #1 SMP Fri Sep 17 19:10:36 MSD 2010 x86_64 x86_64 x86_64 GNU/Linux If you need any more info please comment. This is on a low-end VPS, but it used to work just fine, until it stopped working. Everything else seems to be fine though.

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• Q8300 Core-2 Quad vs X3360 Xeon

  - by alchemical

  I'm looking at this ABMX server, and trying to decide on the CPU. I'm purchasing 2 servers, to be used as dedicated web and DB servers for a web site that has low traffic now but could ramp up quickly. Just trying to decide if it is worth about $200 more (per server) for the Xeon vs the core-2. Passmark rates them at 3567 and 4153, which didn't seem that different. I'm not planning at this point to need virtualization. I did hear rumors that Xeon stands up better in a 24/7 server environment, but heard others say there wasn't that much difference. Planning to run Windows Server 2008, likely the R2 release, with 8GB RAM.

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• Server 2008 Hard Faults

  - by claw

  Hey all, plase bear with me as I haven't looked at a server in a very long time. The problem I am having is with a Windows 2008 Standard FE Service Pack 2 Intel Xeon X3430 @ 2.40 2.39 GHZ 4 GB Memory 64 Bit There seems to be no problems other than the physical memory peaking at 91%, always with over 100 Hard Faults Per Second. To my understanding hard faults should be fairly rare on a machine with. Are there any logs I can show you? Or investigate myself. The general performance of the machine is ok, i can access SBS2008 and change settings fairly smoothly without hangs etc. However, we connect to the server and do quite a bit of SQL via an application. For a record to retrieve say 20 rows, it can take 20+ seconds. Thanks in advance, Jamie EDIT: What the server is used for: IIS ASP Web Service SQL 2008 List item Exchange unable to upload screenshots due to low reputation - why doesnt my SO work here :)

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• Win 7 Privilege Level (Run as administrator) via GP or command line

  - by FinalizedFrustration

  Is there a way to set the Privilege Level for legacy software via group policy or on the command line? I have some legacy software, which we unfortunately cannot move away from. This software requires administrator access. I know I can go into the Properties dialog and check "Run this program as an administrator" on every single instance on every single one of my workstations, but that gets old after the 30th install. If I had my way, we would dump this software, find some software that did what we needed, was fully compliant with Win7 security best-practices and give everyone limited user accounts... However, I am not the boss, so everyone gets administrator accounts. Given that, I suppose I could just tell everyone to open the context menu and choose "Run as administrator", but we have some very, very, VERY low-tech users, and half of them might just choose "Delete" instead. Anyone know of a way to set this option on the command line? or better yet, through Group Policy?

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• Choosing between a dedicated and virtual dedicated server for my startup

  - by MarathonStudios

  I'm about to launch a startup site I've been working on for some time, and I'm just now looking over hosting plans. The site's main feature is fairly processor-heavy (a lot of text processing), so I probably need something other then shared hosting to ensure I don't get shut down for overusing resources. I would like to spend as little as possible on hosting until the site starts generating income, so under-$60/mo is my goal. One caveat is that I need a Windows box for this particular site, so it's harder to get a good deal. For that price, I can either get a bottom-tier dedicated (2gigs ram, pentium 4) or a middle-tier VPS (3gb RAM, a bit more traffic and HD) for a few bucks more per month. I had a bad experience with a low-end VPS a few months ago, so making sure that whatever I get can handle the basic traffic of a website as well as giving me what I need (extra processing power) is essential. Do you have any suggestions as to which way to go, or a certain hosting company you've worked with that you can recommend?

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• CentOS - PHP - Yum Install with Custom ./configure params

  - by Mike Purcell

  I have successfully configured and compiled php on my dev server, and works great, but after talking to a sysadmin buddy, he informed that custom compiles of the latest builds are not recommended for production (or even development) systems. He noted a situation where they custom configured and compiled PHP 5.3.6, only to find that there was some issue with a low-level Postgres driver, so they had to revert back to 5.3.3. So I am considering going back to yum to install PHP, however I have several custom configuration settings and was wondering if it's possible to pass or configure how PHP will be compiled through YUM? My current configure line: Configure Command => './configure' '--with-libdir=lib64' '--prefix=/usr/local/_custom/app/php' '--with-config-file-path=/usr/local/_custom/app/php/etc' '--with-config-file-scan-dir=/usr/local/_custom/app/php/etc/modules' '--disable-all' '--with-apxs2=/usr/sbin/apxs' '--with-curl=/usr/sbin/curl' '--with-gd' '--with-iconv' '--with-jpeg-dir=/usr/lib' '--with-mcrypt=/usr/bin' '--with-pcre-regex' '--with-pdo-mysql=mysqlnd' '--with-png-dir=/usr/lib' '--with-zlib' '--enable-ctype' '--enable-dom' '--enable-hash' '--enable-json' '--enable-libxml' '--enable-mbstring' '--enable-mbregex' '--enable-pdo' '--enable-session' '--enable-simplexml' '--enable-xml' '--enable-xmlreader' '--enable-xmlwriter'

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• What can I do to give some more love and disk space to my database on Ubuntu?

  - by Yaron Naveh

  I'm new to linux. I've deployed a db to ubuntu server on amazon and found out I'm low on disk space. did df (see below) - and found out that I'm 89% capacity on one file system, but less on others. What does this mean? Do I have a few partitions and can now utilize others besides /dev/xvda1? Also /dev/xvdb seems large, is it safe to put the db in it and only use it? If so do I need to mount it or do something special? $> df -lah Filesystem Size Used Avail Use% Mounted on /dev/xvda1 8.0G 6.7G 914M 89% / proc 0 0 0 - /proc sysfs 0 0 0 - /sys none 0 0 0 - /sys/fs/fuse/connections none 0 0 0 - /sys/kernel/debug none 0 0 0 - /sys/kernel/security udev 3.7G 8.0K 3.7G 1% /dev devpts 0 0 0 - /dev/pts tmpfs 1.5G 164K 1.5G 1% /run none 5.0M 0 5.0M 0% /run/lock none 3.7G 0 3.7G 0% /run/shm /dev/xvdb 414G 199M 393G 1% /mnt

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• Intel D510MO board - 1000Mbit LAN or not?

  - by T.J. Crowder

  The Intel forum seems to be down (signing in fails with connection refused), but perhaps someone here knows the answer. The Intel D510MO product page says that the LAN is 10/100/1000, but when I look at the NM10 chipset it uses, it says it's just 10/100 (and the detailed PDF spec here backs that up pretty definitively). I don't immediately see anything saying the D510MO has a different LAN controller than the NM10's onboard one, and it would seem odd if it did given the purpose of the board (low power, small footprint; integrated). Does this board support 1000Mbit LAN or not? Anyone have direct knowledge of it? Thanks in advance.

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• Where are my Tomcat Logs?

  - by gav

  Hi All, I installed Tomcat6 on a Ubuntu 9.04 server using apt-get install tomcat6. I uploaded a WAR using the manager interface and tried to start the application but get a pretty generic error on the Web interface saying it couldn't be started. I am trying to find the logs to determine why my war won't start (I suspect low memory as i'm on a small VPS) but I don't know where they are. /var/lib/tomcat6/logs is empty. My Tomcat splash page reliably informs me of the following; Tomcat is installed with CATALINA_HOME in /usr/share/tomcat6 CATALINA_BASE in /var/lib/tomcat6, following the rules from /usr/share/doc/tomcat6-common/RUNNING.txt.gz. Thanks, Gav

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• OOM-Killer, jboss and kernel panic

  - by user32425

  Hi, We are running RedHat 3.4.6(x32) on VMWareEsx3.5(x64) with 6GB RAM. A few java processes(including jboss) are running in the background. The problem is that the java processes consume lots of memory, and sometimes they are killed by the OOM-killer. When OOM-killer is about to act, the free physical memory is very low 100MB-200MB, but the swap is not used (99% free). Sometimes this causes a kernel panic too. So why isn't the swap used? How to investigate this kernel panic? Is using 6GB memory on 32bit Redhat wise? Thanks

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• PHP cgi locks up and times out.

  - by Oli

  I've got a dozen wordpress sites hosted on a nginx/php-cgi setup. After a variable amount of time (usually not that long, and occasionally very fast) PHP locks up and after 2 minutes (the timeout I set in nginx), it get a 504 timeout. I've tried everything I can think of. I've been using an init script to launch php-cgi but I compiled out php-fpm and tried that for a day with various configurations with the same results. I've tried a low number of PHP_FCGI_CHILDREN. I've tried as high as my RAM will let me. I've tried various settings for PHP_FCGI_MAX_REQUESTS. xcache seemed to exacerbate the issue, so I removed it. The server is a VPS but it has over a gig of ram dedicated to it. All suggestions are welcome at this juncture because I'm desperate.

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• unable to get local issuer certificate - Ubuntu 11.04

  - by user1443867

  I'm facing a strange issue. My vps from Linode has no issue connecting to apple push server with following command. openssl s_client -connect gateway.sandbox.push.apple.com:2195 -cert Test_dev_apns_cert.pem -key Test_dev_apns_key.pem However, I was using the same pem files with above command testing from my another low budget vps and I'm getting this: Verify return code: 20 (unable to get local issuer certificate) Both are running Ubuntu 11.04 and installed LAMP as usual. No special configuration is done to both servers for SSL. Am I missing something here?

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