cPanel FAQ for VPS

From: http://www.cpanel.net/docs/whm/FAQ.htm

Q: I’m having server problems but the problem is not listed below. What should I do?

A: There are two options:

  1. You can search the Knowledgebase in WebHost Manager. The is explained in the support part of this manual.
  2. You can search the CPanel forums – http://support.cpanel.net/

Q: How do I login to Cpanel from a non-GUI?

A: Do the following:

  1. /usr/local/cpanel startup
  2. /etc/rc.d/init.d/cpanel3 restart – This will restart CPanel.

Q: I just got another server, what do I do?

A: If you would like to make your two servers work together, you will need to establish a trust relationship with your primary nameserver – refer to Establishing a trust relationship for more information. You can also transfer your old server’s files to your new server – refer to Transfers for more information.

Q: Proftp will not start it says, ‘unable to determine the ip address of mydomainhere.com’. What do I do?

A: You need to change your hostname to a FQDN (Fully Qualified Domain Name ). A FQDN has a host name, and a domain name which includes a top-level domain, e.g. www.sub.domain.com.

  1. #pico /etc/sysconfig/network
  2. Type hostname www.sub.domain.com
  3. Save changes and quit pico.
  4. Now, add a DNS Zone for yourdomain.com in WebHost Manager.
  5. Add an entry to /etc/hosts for your hostname.

Q: I have a CPanel license but when I login it says ‘Invalid Lisc File’. What’s wrong?

A: There are a couple of possibilities. The date on your server could be improperly synced, your main IP could have changed, or your files could have been corrupted.

  1. First, try to resync your server’s date:

    #rdate -s rdate.darkorb.net

  2. If that does not work, try to update your CPanel license file:

    #/usr/local/cpanel/cpkeyclt

  3. If these do not work contact your distributor so they can update your license

Q: My install keeps saying “waiting for updated to finish”. What should I do?

A: Do the following:

  1. Open another Terminal window and run as root:

    #rsync -av rsync://ftp.cpanel.net/scripts /scripts

  2. /etc/rc.d/init.d/cpanel3 restart – This will restart CPanel.

Q: What types of traffic does the Bandwidth monitor show?

A: The bandwidth monitor watches http, ftp, and pop traffic.

Q: I’ve added accounts in WebHost Manager that aren’t showing up. What’s wrong?

A: Your domain database has not been updated, you need to run:

#/scripts/updateuserdomains

Q: What does Initial Nameserver Setup do?

A: This starts the name and adds it to the list of daemons to be checked.

Q: What should I do about partitioning my drive? What sizes do I need?

A: Refer to Installation for more information.

Q: How do I upgrade using buildapache.sea?

A: Do the following:

  1. SSH into your server.
  2. SU and log in as root.
  3. #wget http://layer1.cpanel.net/buildapache.sea
  4. #chmod 755 buildapache.sea
  5. #./buildapache.sea
  6. Wait for the installer to complete.
  7. Cleanup after the install with:

    #rm -Rf buildapache/

    #rm buildapache.sea

Q: How can I use Cpanel in a non-graphical environment?

A: Do the following:

  1. #/sbin/chkconfig –add xfs
  2. #/sbin/service xfs start

Q: Neomail keeps returning no MD5.so in @INC. What do I do?

A: #/scripts/cleanmd5

Q: How can I fix problems with mail that result from incorrect permissions?

A: #/scripts/mailperm

Q: I’m trying to add FrontPage extensions, or a new account, and I get sd(8,10) write failure, user limit block reached. What do I do?

A: #/scripts/fixquotas

Q: What can fix many common problems?

A: #/scripts/fixcommonproblems

Q: I keep getting a 500 error when trying to use Mailman. What is wrong?

A: Your hostname is not being sent with your e-mail. Do the following:

  1. #/scripts/fixoldlistswithsuexec
  2. If that doesn’t work, try:

    #/scripts/fixmailmanwithsuexec

    #pico /usr/local/apache/conf/httpd.conf – move the last vhost to the first vhost in the file.

Q: What do I do when Mailman wants UID 99 but is getting -1?

A: #/scripts/upcp

Q: My subdomain logs are not being processed. What do I do?

A: Do the following:

  1. #rm -f ~username/tmp/lastrun
  2. #killall -9 cpanellogd
  3. #/usr/local/cpanel/cpanellogd

Q: How do I enable FrontPage on port 443 with ssl?

A: Do the following:

  1. /usr/local/frontpage/version5.0/bin/owsadm.exe -o install -p 443 -m
  2. $domain -t apache-fp -xuser $user -xgroup $group -servconf
  3. “/etc/httpd/conf/httpd.conf”

Q: Neomail complains of no MD5.so in @INC – what do I do?

A: Do the following:

  1. Rebuild Perl using installer from http://cpanel.net/
  2. Just running /scripst/cleanmd5 should do it.

Q: When adding FrontPage, I get sd(8,10) write failure, user limit block reached. What do I do?

A: Run /scripts/fixquotas

Q: How do I fix general mail problems related to permissions?

A: /scripts/mailperm

Q: How do I fix the most common problems?

A: /scripts/fixcommonproblems

Q: How do I fix cgi scripts that are returning a 500 error because of permissions?

A: Do the following:

  1. /scripts/fixsuexeccgiscripts
  2. Read /usr/local/apache/logs/suexec_log for Mailman 500 Error.
  3. /scripts/fixmailmanwithsuexec
  4. Edit /usr/local/apache/conf/htpd.conf and move the vhost it creates (almost always the last one in the file) to be the first vhost.
  5. Restart Apache: /etc/rc.d/init.d/httpd restart
  6. Run /scripts/fixoldlistswithsuexec

Q: What do I do when Mailman wants UID 99 when getting -1?

A: Do the following:

  1. Edit httpd.conf
  2. Make sure Group is set to nobody.
  3. Run /scripts/upcp – that should rebuild mailman with the correct UID/GID.

/scripts/upcp should now detect this and fix it for you automatically.

  1. Turn on SYN Cookies if built into the kernel.
  2. echo 1 >/proc/sys/net/ipv4/tcp_syncookies – at boot time after the /proc file system has been mounted.

Q: How do I troubleshoot Perl scripts?

A: Do the following:

  1. Edit Perl / cgi script – at top of file #!/usr/bin/perl
  2. Use CGI::Carp qw(fatalsToBrowser); – errors should be redirected to browser rather then getting a 500 error.
  3. Also, check if the script runs on the command line – perl -w ./scriptname.cgi – and see if it gives you errors.

Q: What do I do if subdomain logs are not getting processed?

A: Do the following:

  1. rm -f ~username/tmp/lastrun
  2. killall -9 cpanellogd
  3. /usr/local/cpanel/cpanellogd

Q: How do I stop a crontab?

A: Add – >/dev/null 2>&1 – after the entry in the crontab.

Q: What do I do when MySQL gives error of access denied for root@localhost?

A: Make sure root pass is in /root/.my.cnf, this is usually the first root password the box was given when CPanel was installed.

Q: How do I set the /etc/my.cnf file for sites with vbb forums that don’t close connections, thus spawning 500 mysqld’s and hogging all the RAM?

A: Do the following to mysqld:

  • set-variable = max_connections=1500
  • set-variable = max_user_connections=200
  • set-variable = wait_timeout=200
  • set-variable = interactive_timeout=800

Q: What do I do if SpamAssassin is taking up a lot of memory and CPU?

A: The chances are the dbm database has gotten corrupted. Try this:

  1. Find out what user it’s running as with ‘top’.
  2. cd /home/user/
  3. rm -rf .spamassasin
  4. Then mail them a couple of times to see if it fixes the problem.

Q: What do I do if buildapache.sea bombs out with a lot of nasty looking errors?

A: Do the following:

  1. Find out the version (cat /etc/redhat-release).
  2. Find a server running the same version that works.
  3. tar xzvf bits.tgz /usr/include/bits
  4. Copy that to the broken server.
  5. Backup /usr/include/bits somewhere.
  6. tar xzvf bits.tgz from /

Q: What do I do when a Guestbook is not showing anything, I get a blank page when trying to view, and no errors when submitting?

A: Do the following:

chown nobody /home/username/.guestbook

Make sure ‘nobody’ can write to it.

Q: What do I do when all the Perl/CGI scripts that are not running as root (including Interchange) get the error “getgrgid: invalid groupid XXXXX”? From Apache’s error_log …

[Tue Mar 26 09:13:16 2002] [error] [client x.x.x.x] (2)No such file or directory: getgrgid: invalid groupid 32015

[Tue Mar 26 09:13:16 2002] [error] (2)No such file or directory: exec of /home/username/public_html/utility.cgi failed

[Tue Mar 26 09:13:16 2002] [error] [client x.x.x.x] Premature end of script headers: /home/username/public_html/script.cgi

A: Do the following:

chmod 644 /etc/group

If that doesn’t fix it, check permissions on the passwd file and shadow file as well just for good measure.

Q: What are the default locations for Mailman, exim config, exim log, or the exim reject log?

A: The locations are:

  • Mailman lists = /usr/local/cpanel/3rdparty/mailman/lists/
  • Exim Config = /etc/exim.conf
  • Exim Log = /var/log/exim_mainlog
  • Exim Reject Log = /var/log/exim_rejectlog

Q: What do I do when setting up a trust relationship and I get errors about possible security threats and stuff about SSH/known_hosts?

A: Most likely the master server has changed it’s ssl info. The easiest way to remedy this is:

  1. cd /etc/
  2. rm -rf .ssh

Then try setting up the trust relationship again.

Cpanel disk used incorrect showing unlimited or 0MB

You can fix this by running the script  /scripts/fixquotas

is this doesn’t work and you are using Virtuozzo or OpenVZ you will need to set the QUOTAUGIDLIMIT perimeter – this allows the system to allocate user IDs (UID)

e.g (openvz)

vzctl set 101 –quotaugidlimit 1000 –save

then run the scrip “/scripts/fixquotas”

and it should all work.

Troubleshooting

If you’ve done the above and it still doesn’t work (or the value still says 0MB) this may be due to cPanel caching the disk usage results. to disable this:

Select the following in your WHM.

WHM >> Tweak Settings >> System >> “Disable Disk Quota display caching (WHM will cache disk usage which may result in the display of disk quotas being up to 15 minutes behind the actual disk usage. Disabling this may result in a large performance degradation.)”

Linux slow name resolution (DNS)

source

# vi /etc/modprobe.conf

add to the bottom of file:

alias ipv6 off
alias net-pf-10 off
# reboot

or before you reboot, also check out:

# grep hosts /etc/nsswitch.conf
#hosts:     db files nisplus nis dns
hosts:      files dns

Your /etc/nsswitch.conf should look similar to this:

#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#	nisplus or nis+		Use NIS+ (NIS version 3)
#	nis or yp		Use NIS (NIS version 2), also called YP
#	dns			Use DNS (Domain Name Service)
#	files			Use the local files
#	db			Use the local database (.db) files
#	compat			Use NIS on compat mode
#	hesiod			Use Hesiod for user lookups
#	[NOTFOUND=return]	Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
hosts:      files dns

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files     

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   files

publickey:  nisplus

automount:  files
aliases:    files nisplus



DirectAdmin yum.conf

vi /etc/yum.conf

[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=centos-release
tolerant=1
exactarch=1
retries=20
obsoletes=1
gpgcheck=1

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d
exclude=apache* httpd* mod_* mysql* MySQL* da_* *ftp* exim* sendmail* php*

How to override open_basedir settings in Plesk

Plesk will overwrite any httpd.conf settings unless you include them in…

/home/httpd/vhosts/DOMAIN/conf/vhost.conf

basically, the instruction everywhere on the web on how to modify the open_basedir for plesk, so it won’t overwrite it, were all wrong…

here’s the instruction from the Plesk website:

http://kb.parallels.com/en/432

<Directory /home/httpd/vhosts/DOMAIN/httpdocs>
php_admin_value open_basedir “/home/httpd/vhosts/DOMAIN/httpdocs:/tmp:/usr/bin:/usr/local/bin”
</Directory>

this didn’t work because the the plesk httpd.include (which gets overwritten each time) used the “IfModule sapi_apache2.c” call, which MUST ALSO be used in the vhost.conf (which overrides)…

here is the correct way of inputing the vhost.conf:

<Directory /home/httpd/vhosts/DOMAIN/httpdocs>
<IfModule sapi_apache2.c>
php_admin_value open_basedir “/home/httpd/vhosts/DOMAIN/httpdocs:/tmp:/usr/bin:/usr/local/bin”
</IfModule>
</Directory>

Adding custom modules to apache for customapache : DirectAdmin

If you want to add any extra modules to apache, they’ll need to be compiled in. Any module that needs to be compiled in will have a –with-module type flag which will need to be used. To add this flag, run the following:

cd /usr/local/directadmin/customapache
vi configure.apache_ssl

#add your –with-module line to the end of the file,
# and make sure the character exists at the end of all lines except the last one.

./build clean
./build apache_mod_ssl

Then restart apache:
RedHat:

/sbin/service httpd restart

FreeBSD:

/usr/local/etc/rc.d/httpd restart

If you run into problems, you may also need to recompile php as well:

./build php

Then restart apache again.

Easy apache error on a VPS – !! Warning (VZ): You are only only guaranteed xx Megabytes of ram! xxx Megabytes is recommended. !!


Easy::Apache v3.2.0 Build 4310

!! Warning (VZ): You are only only guaranteed 224 Megabytes of ram! 512 Megabytes is recommended. !!

If you get above memory error on VPS while running easy apache,  You can fix by using following steps. Login in to main VPS and edit the variable OOMGUARPAGES accordingly.

OR

OpenVZ Users :
You can also modify the
OOMGUARPAGES values from shell as required.  :

vzctl set 101 –OOMGUARPAGES 561120:2147483647 –save

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