How To Prevent OOM (Out Of Memory) Crashes

Aug 19, 2008

I have a colocated server with the following specs:

Intel Core 2 Quad Q6600 2.4Ghz
4GB RAM
400GB SATA Drive

I have a problem every few days, the server keeps hanging up and giving an "Out of Memory" message and SSH just hangs and doesn't connect. Every time i have to call out a tech to manually reboot it.

Is there a setting i can change to make SSH connect even when it is out of memory, or anything that can prevent it happening?

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MySQL Crashes: Might Be Because Of Memory

Jan 5, 2007

My mysql server keeps on crashing. I wonder if it is because of out of memory. Last week, I upgraded my memory from 2GB to 6GB and I executed the command "free" to check memory usage. It uses 5GB in memory usage and leave under 10,000k unuse. Do you think this might be the cause of weekly mysql crashes?

I only use the server for mysql, so it is a dedicated mysql server.

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Apache Crashes Daily

Apr 21, 2009

I am running a dedicated server.

My apache crashes daily and I am investigating the cause of it.

I have found this strange message in my apache error_log....

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CPanel Crashes My Server

Aug 8, 2008

I have remote uptime tracking on my server, and I am regularly getting text messages and emails regarding my server going down. This in itself isn't odd, however the fact is, everytime the problem is cPanel.

I log into my PC and find an email from my server and it contains the following;

Quote:

cpsrvd failed @ Thu Aug 7 19:11:17 2008. A restart was attempted automagically.

Failure Reason: Unable to connect to port 2086

what's causing this? It's on a VPS and the main server hasn't been down once, but this VPS constantly goes offline, at least once a day...

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Mar 2, 2008

I have a server ($200)

I got tired from these frequent crashes.

I do not know how companies promising 99% uptime while customers do not get 80% uptime.

Just see this snapshot

Every week my server is down at least twice.

I have 7000-8000 daily uniques.

I really got tired.

Got tired from life also.

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Mar 30, 2008

I have a VPS and almost once per day PIM has to restart the DNS service. I think it is because of the high volume of sites on it.

Could someone point me to which log files I could have a look at and maybe get a clue why it crashes?

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Jan 10, 2008

I have seen this on a few different cpanel servers. Mainly seems an issue with some kernels but I have a server at softlayer and it seems it does it after a server has been up a few days.

At first I thought this was just an issue with grsecurity kernels but seems its an issue with any kernel on it after it been up a few days. On other servers though I have been able to change kernel versions and fix it. I suppose this may be related to disk space used as well.

Problem with my softlayer server is that teh tech didnt follow my partitong directions and installed everything in one slab / so I guess when you edit or add quota it has to scan the entire disk.

I had recently rebooted that server into a 2.6.29-grsecurity kernel and it fixed the issue but tonight I was messing around and it started all over. Not as bad as before but still around 305 minutes of totally lagging the server.

My mount options are
LABEL=/ / ext3 defaults,noatime,usrquota 1 1

Seems to do the same with or without noatime.

Has anyone ran into this issue or know any solution?

os is centos5 64 bit

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Apache Crashes When Trying To Upgrade

May 20, 2008

I tried to upgrade from apache 2.0.51 to 2.0.63 but it crashes as soon as new version is started and httpd is reloaded.

here is a part of the log

[Fri Apr 25 10:57:46 2008] [notice] Apache/2.0.63 (Unix) configured -- resuming normal operations
Segmentation Fault in 3642, waiting for debugger
Segmentation Fault in 3697, waiting for debugger
Segmentation Fault in 3696, waiting for debugger
[Fri Apr 25 10:58:11 2008] [notice] caught SIGTERM, shutting down
[Fri Apr 25 10:58:22 2008] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Fri Apr 25 10:58:22 2008] [notice] mod_security/1.9.4 configured
[Fri Apr 25 10:58:22 2008] [notice] Digest: generating secret for digest authentication ...
[Fri Apr 25 10:58:22 2008] [notice] Digest: done
[Fri Apr 25 10:58:22 2008] [notice] LDAP: Built with OpenLDAP LDAP SDK
[Fri Apr 25 10:58:22 2008] [notice] LDAP: SSL support unavailable
[Fri Apr 25 10:58:23 2008] [notice] Apache/2.0.63 (Unix) configured -- resuming normal operations
Segmentation Fault in 5422, waiting for debugger
Segmentation Fault in 5421, waiting for debugger
Segmentation Fault in 5452, waiting for debugger
Segmentation Fault in 5461, waiting for debugger
Segmentation Fault in 5451, waiting for debugger
Segmentation Fault in 5466, waiting for debugger
Segmentation Fault in 5465, waiting for debugger
Segmentation Fault in 7363, waiting for debugger
Segmentation Fault in 5435, waiting for debugger
Segmentation Fault in 5906, waiting for debugger
Segmentation Fault in 7251, waiting for debugger
Segmentation Fault in 6041, waiting for debugger
Segmentation Fault in 7723, waiting for debugger
Segmentation Fault in 7986, waiting for debugger
Segmentation Fault in 9659, waiting for debugger
Segmentation Fault in 9643, waiting for debugger
Segmentation Fault in 9361, waiting for debugger
Segmentation Fault in 9744, waiting for debugger
Segmentation Fault in 9543, waiting for debugger
Segmentation Fault in 9879, waiting for debugger
Segmentation Fault in 9794, waiting for debugger
Segmentation Fault in 9758, waiting for debugger
[Fri Apr 25 11:01:10 2008] [notice] caught SIGTERM, shutting down
[Fri Apr 25 11:01:12 2008] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Fri Apr 25 11:01:12 2008] [notice] mod_security/1.9.4 configured
[Fri Apr 25 11:01:12 2008] [notice] Digest: generating secret for digest authentication ...
[Fri Apr 25 11:01:12 2008] [notice] Digest: done
[Fri Apr 25 11:01:12 2008] [notice] LDAP: Built with OpenLDAP LDAP SDK
[Fri Apr 25 11:01:12 2008] [notice] LDAP: SSL support unavailable
[Fri Apr 25 11:01:13 2008] [notice] Apache/2.0.63 (Unix) configured -- resuming normal operations
Segmentation Fault in 11634, waiting for debugger
Segmentation Fault in 11635, waiting for debugger
Segmentation Fault in 11661, waiting for debugger
Segmentation Fault in 11695, waiting for debugger
Segmentation Fault in 11760, waiting for debugger
Segmentation Fault in 11723, waiting for debugger
Segmentation Fault in 11694, waiting for debugger
Segmentation Fault in 11837, waiting for debugger
Segmentation Fault in 11812, waiting for debugger
Segmentation Fault in 12022, waiting for debugger
Segmentation Fault in 11848, waiting for debugger
Segmentation Fault in 11879, waiting for debugger
Segmentation Fault in 13342, waiting for debugger
Segmentation Fault in 12062, waiting for debugger
Segmentation Fault in 13428, waiting for debugger
Segmentation Fault in 13569, waiting for debugger
Segmentation Fault in 11849, waiting for debugger
Segmentation Fault in 13881, waiting for debugger
Segmentation Fault in 13380, waiting for debugger
[Fri Apr 25 11:02:27 2008] [notice] caught SIGTERM, shutting down
[Fri Apr 25 11:02:29 2008] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Fri Apr 25 11:02:29 2008] [notice] mod_security/1.9.4 configured
[Fri Apr 25 11:02:29 2008] [notice] Digest: generating secret for digest authentication ...
[Fri Apr 25 11:02:29 2008] [notice] Digest: done
[Fri Apr 25 11:02:29 2008] [notice] LDAP: Built with OpenLDAP LDAP SDK
[Fri Apr 25 11:02:29 2008] [notice] LDAP: SSL support unavailable
[Fri Apr 25 11:02:30 2008] [notice] Apache/2.0.63 (Unix) configured -- resuming normal operations
Segmentation Fault in 14123, waiting for debugger
Segmentation Fault in 14154, waiting for debugger
Segmentation Fault in 14156, waiting for debugger
Segmentation Fault in 14273, waiting for debugger
Segmentation Fault in 14114, waiting for debugger
Segmentation Fault in 14308, waiting for debugger
Segmentation Fault in 14316, waiting for debugger
Segmentation Fault in 14274, waiting for debugger
Segmentation Fault in 14315, waiting for debugger
Segmentation Fault in 15562, waiting for debugger
Segmentation Fault in 14113, waiting for debugger
Segmentation Fault in 15583, waiting for debugger
Segmentation Fault in 15615, waiting for debugger
Segmentation Fault in 15616, waiting for debugger
Segmentation Fault in 15584, waiting for debugger
Segmentation Fault in 15637, waiting for debugger
Segmentation Fault in 15631, waiting for debugger
Segmentation Fault in 15614, waiting for debugger
Segmentation Fault in 16332, waiting for debugger
Segmentation Fault in 14262, waiting for debugger
Segmentation Fault in 17504, waiting for debugger
Segmentation Fault in 15638, waiting for debugger
Segmentation Fault in 17515, waiting for debugger
Segmentation Fault in 18105, waiting for debugger
Segmentation Fault in 17516, waiting for debugger
Segmentation Fault in 18163, waiting for debugger
Segmentation Fault in 18175, waiting for debugger
Segmentation Fault in 18177, waiting for debugger
Segmentation Fault in 18178, waiting for debugger
Segmentation Fault in 18149, waiting for debugger
Segmentation Fault in 19931, waiting for debugger
Segmentation Fault in 20098, waiting for debugger
Segmentation Fault in 18176, waiting for debugger

I am on VPS and myself am quite a noob in this. Upgrade is performed by the support people.

If you guys can help please explain in lame terms
Let me know if you need some specific info about the system.

I was suggested that some modules might not be upgraded yet and they cause the crash, so to fix I should remove modules one by one from httpd config until get to the problematic one.

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Jun 27, 2007

I am running CPanel and WHM, and every morning, I need to restart apache manually in order to work. Then it works for the whole day. It crashes I guess, but I don't know why. What logs do I need to check?

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Feb 13, 2007

Today, I put a new server on our racks.

Problem: the machine crashes exactly every 10 minutes. The crash occurs with no entry on the logs and with 0.00 load. It is as if someone take out the current every 10 minutes.

Here are the specs:

- 2 CPU Intel Xeon 2.0
- 8 Gb RAM ECC
- 2 x 250 Gb HDs

This machine needs plenty of current. I wonder if I am not going over the rack power quota. May be there is a system to allow overages for then 10 minutes, then it cut back the current to the rack quota.

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Nov 26, 2007

I have to reboot this server each day. It seems to crash (or freeze if you call it) around 11:55 pm server time (central US). How do I trace the cause of this? I installed CSF / LFD in replacement of APF/BFD.

This is a centos 3.9 / cpanel 11 box.

crontab -e shows nothing out of the default ordinary

/var/log/messages shows this

Nov 23 19:14:00 server sshd(pam_unix)[29523]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:02 server sshd(pam_unix)[29533]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=gopher
Nov 23 19:14:02 server sshd(pam_unix)[29541]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=gopher
Nov 23 19:14:02 server sshd(pam_unix)[29553]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=gopher
Nov 23 19:14:02 server sshd(pam_unix)[29570]: check pass; user unknown
Nov 23 19:14:02 server sshd(pam_unix)[29570]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:05 server sshd(pam_unix)[29580]: check pass; user unknown
Nov 23 19:14:05 server sshd(pam_unix)[29580]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:08 server sshd(pam_unix)[29584]: check pass; user unknown
Nov 23 19:14:08 server sshd(pam_unix)[29584]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:11 server sshd(pam_unix)[29588]: check pass; user unknown
Nov 23 19:14:11 server sshd(pam_unix)[29588]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:13 server sshd(pam_unix)[29592]: check pass; user unknown
Nov 23 19:14:13 server sshd(pam_unix)[29592]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:16 server sshd(pam_unix)[29596]: check pass; user unknown
Nov 23 19:14:16 server sshd(pam_unix)[29596]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:19 server sshd(pam_unix)[29600]: check pass; user unknown
Nov 23 19:14:19 server sshd(pam_unix)[29600]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:22 server sshd(pam_unix)[29605]: check pass; user unknown
Nov 23 19:14:22 server sshd(pam_unix)[29605]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:25 server sshd(pam_unix)[29614]: check pass; user unknown
Nov 23 19:14:25 server sshd(pam_unix)[29614]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:27 server sshd(pam_unix)[29618]: check pass; user unknown
Nov 23 19:14:27 server sshd(pam_unix)[29618]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com
Nov 23 19:14:30 server sshd(pam_unix)[29622]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=mailnull
Nov 23 19:14:33 server sshd(pam_unix)[29631]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=nfsnobody
Nov 23 19:14:36 server sshd(pam_unix)[29635]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=rpcuser
Nov 23 19:14:38 server sshd(pam_unix)[29639]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=rpc
Nov 23 19:14:41 server sshd(pam_unix)[29643]: authentication failure; logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=a2.f5.5646.static.theplanet.com user=gopher

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Apr 27, 2007

I got a new server (Debian Etch) and experienced 2 strange server crashes during the last month.

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After reboot log files doesn't show anything unusual.

There are only 2 small html sites on this server with 10-20 visitors per day.

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Dec 16, 2007

I've been trying to see whats going on with this server for a few days now but am unable to resolve the issue.

This is a 3 server setup. One is a mail server, another a mysql server and the host server. The apache on the host has plenty of ram (8 gigs) and it is currently under 5 gigs. The site is mainly a social networking site.

Now the apache would crash at times like 1:16, 2:17, 3:16, 4:18; basically in 1 hour intervals. Now it doesn't always crash every hour. Sometimes it might go up to 5 hours and may crash at say 8:50

Well it turns out that the mail server new mass mailing method has some sort of effect on the host server.

This is what happens.

1.) Host has a ton of apache processes up and running (site is fine and dandy).

2.) Mail server is about to launch its barrage email (load about .5)

3.) Then all of the apache processes stopped appearing on my top (nobody is able to browse the site at this point).

4.) after a few minutes the apache processes reappear and the site loads again.

5.) Mail server is now mass mailing and its loads reaches up to 4.

6.) WHM emails me that apache was down and it restarted the service.

Here is the interesting thing about this. First of all I found out that the apache processes were actually not gone. They were somehow suppressed. For example during this freeze moment, if I run a "ps aux" I see that all the apache process are running yet they are not using any cpu or ram (which is why I don't see them on top). Now if I were to do a "service httpd restart" during this moment, it will restart but will still be frozen until its set time.

When the site is accessible again, that is when the mail starts leaving from the mail server.

The owner thinks this is related, and I tend to agree.

The only problem is that I have no clue as to what is going on. Apache does not leave any error logs period. Nothing in messages or in exim logs. For a while I thought it might be lfd killing the apache but I was wrong. Nothing informative on the lfd logs either.

Could it be perhaps a bind issue? Somehow the mail server takes over the host system before its launch?

I'm posting this in the hope that some of the techies here and give me some hints and directions where I can find an answer. Perhaps someone who read this thread has seen this kind of issue before.

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- The content of my VPS (besides the necessary software) is a PHPBB 3.0.0 forum that is heavily visited. Its subject is World of Warcraft, a popular MMORPG;

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has anyone got any experience with this?

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Pretty frequently my app (which works just fine on Linux) makes Apache crash. If I perform 500 requests with Apache Bench, I see this:

Benchmarking localhost (be patient)
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Completed 200 requests
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How can I find out what makes apache/mod_perl crash?

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Jun 12, 2009

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Code:
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total used free shared buffers cached
Mem: 768 449 318 0 0 0
-/+ buffers/cache: 449 318
Swap: 0 0 0
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[url]

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Quote:

# uname -a
Linux server2.[url]2.6.18-128.1.10.el5 #1 SMP Thu May 7 10:35:59 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

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logs:

May 25 21:50:42 server100 pure-ftpd: (weblogin100@62.56.133.36) [NOTICE] /home/weblogin100//.htpasswds/update/Login.php downloaded (21251 bytes, 755.78KB/sec)

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I am giving few tips on securing your server against hack attempts. You must check these inspite of other securities like firewall, rootkits detectors etc.

1. Most Important, do not disable safe_mode under php.ini. If any customer asks to disable it, turn it off on his account only, not on whole server.

As most of the time attack is done using shellc99 (phpshell) script. In case safe_mode is off on server and there are public dirs with 777 permission, he can easily hack through.

2. Compile apache with safe mode as well.

3. In cpanel under tweek settings, turn on base_dir, if someone requests to turn off, turn it off on his/her account only. As using phpshell one can easily move to main server dirs like /etc, /home.

4. Do not allow Anonymous Ftp on your server. You can turn it off from ftp config under WHM Service Configuration. If its allowed, one can easily bind port using nc tool with your server and gain root access. Always keep it disabled.

5. Make sure /tmp is secured. You can easily do that by running this command /scripts/securetmp using ssh. But do make sure, /tmp is secured. Else one can upload some kind of perl script in /tmp dir and can deface or damage all data on the few/all accounts on your server.

keeping your server secure from hack attempts.

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Prevent Php Script Run As .gif Or .jpg

Oct 28, 2007

Does anyone know how to prevent some shell, php script change file name from file.php to file.jpg or file.gif and upload to server and run it to attack server?

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