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UUID mounts in fstab is very useful if you have external usb hdd that is often connected and disconnected.

To find out the UUID of a disk drive, you can use the simple `ls` command as below:

Additionally below commands can also be used:

This is dues to bug in the default installation of qmail in handling local mails... such as mails to root@localhost where the qmail-local binary is not set with the right owner and permissions, as such mails are not able to be written to the spool located at "/usr/local/psa/handlers/spool".

The error in "/usr/local/psa/var/log/maillog" looks like below:

To resolve, change the owner and permission of /var/qmail/bin/qmail-local to reflect the same as qmail-remote.

Restart qmail:

This is useful when migrating servers and you want to reduce the DNS time to live for all domains.

Change the TTL on all domains to 5 mins (300 seconds) in the psa database.

Then update the zone files via:

Verify with:

Below is a clean method of updating, instead of doing a straight `yum update` which I have often done in the past and broken OS.

Udev is a dependency of xorg and other development packages that breaks OpenVZ containers if installed or upgraded.

Re-create the missing devices after an upgrade via:

For a permanent fix, edit /etc/rc.sysinit to disable udev and auto-repair the devices:

Dear Anyone.

Hello i came across this website doing a search for My.Cnf tweeks or configurations for the SQL_Max_Connections and i was wondering some things. I have a Linux CentOS system with 2.5 gigs of Ram, Running Apache. and PHP. what would be the "proper" My.cnf file settings for a Music Website i keep getting a max connection overload on the network.

Matthew Nalett
New Music Promote
http://www.newmusicpromote.com

Here is my current My.Cnf settings.
Any Suggestions on how to optimize this for a Music Network?


[mysqld]
set-variable=local-infile=0

Get status of apache (80) and lighttpd (81) on different ports:

This is done at the nodes.

1. Enable apache server-status in httpd.conf :
   
   <Location /server-status> 
    SetHandler server-status
    Order deny,allow
    Deny from all
    Allow from 127.0.0.1
</Location>
2. Enable lighttpd server-status in lighttpd.conf :
   
   $HTTP["remoteip"] == "127.0.0.1" {
status.status-url          = "/server-status"
}
3. Create /etc/munin/plugin-conf.d/apache:
   
   [apache*]
env ports="80 81" 

   * Test with:
   

   ports="80 83" /etc/munin/plugins/apache_processes

lighttpd idle process will be a straight line as total of busy and idle process is always the same when drawn as STACK, . To change this to LINE1:

At the host, edit "/etc/munin/munin.conf" and add the below line to the corresponding host:

1. Edit conf file: /etc/lighttpd/lighttpd.conf
   
2. Enable mod_expire and mod_compress.
   
3. Expire static files set for 3 days:
   
   $HTTP["url"] =~ "\.(js|css|gif|jpg|png|ico|txt|swf|html|htm)$" { expire.url = ( "" => "access 3 days" ) }
4. Compress mime types:
   
   compress.cache-dir         = "/var/cache/lighttpd/compress/"
compress.filetype          = ("text/plain", "text/html", "text/css", "text/xml", "text/javascript")
5. Cleanup the compressed cache via daily cron script:
   
   #!/bin/bash
# lighttpd_cache_clean
# Clean cache stored at /var/cache/lighttpd/compress
# Place in /etc/cron.daily

# Cache dir path
CROOT="/var/cache/lighttpd/compress"

#Deleting files older than 3 days
HOURS=72

# Lighttpd user and group
LUSER="lighttpd"
LGROUP="lighttpd"

# start cleaning
/usr/sbin/tmpwatch --mtime ${HOURS} ${CROOT}

# if directory missing just recreate it
if [ ! -d $CROOT ]
then
        mkdir -p $CROOT
        chown ${LUSER}:${LGROUP} ${CROOT}
fi

exit 0
6. Create the cache directory and update permissions:
   
   mkdir -p /var/cache/lighttpd/compress
chown lighttpd:lighttpd /var/cache/lighttpd/compress
7. Restart lighttpd.

Below command will convert and create a pdf of a manual page.

Recent upgrade to Apache-2.2.3 secured down on executables not able to be included within a SSI include call and was getting "unable to include potential exec" in the apache error log file.

Apparently .shtml files were being used as includes via SSI. Changing the included files to .html resolved the issue.

Below was the command issued from the document root to quickly rename all the embedded leftmenu.shtml to leftmenu.html: