Minimal Services on CentOS

    This will improve the performance of a system by disabling unneeded services. Another benefit is reduced hardware requirements for your server.

    Methodology of Minimal Services

    • Perform minimal OS installations
    • Install additional software as needed after installation
    • Minimal installations reduce the number of packages requiring updates
    • No graphical environment needed on servers
    • Limiting the Number of Running Services
    • List of system services

    Here is a list of services(daemons) to help you decide what to axe. Here is another list. After performing a minimal installation, the machine reboots. When you login disable as many services as possible with the following commands:

    chkconfig anacron off
    chkconfig apmd off
    chkconfig atd off
    chkconfig autofs off
    chkconfig cpuspeed off
    chkconfig cups off
    chkconfig cups-config-daemon off
    chkconfig gpm off
    chkconfig isdn off
    chkconfig netfs off
    chkconfig nfslock off
    chkconfig openibd off
    chkconfig pcmcia off
    chkconfig portmap off
    chkconfig rawdevices off
    chkconfig readahead_early off
    chkconfig rpcgssd off
    chkconfig rpcidmapd off
    chkconfig smartd off
    chkconfig xfs off
    chkconfig ip6tables off
    chkconfig avahi-daemon off
    chkconfig firstboot off
    chkconfig yum-updatesd off 
    chkconfig sendmail off
    chkconfig mcstrans off
    chkconfig pcscd off
    chkconfig bluetooth off
    chkconfig hidd off
    

    The next group of services is more useful to servers in some circumstances.

    • xinetd may be needed for some servers
    • acpid needed for power button to shut down server gently
    • microcode_ctl not needed on AMD machines
    • haldaem and messagebus support for plug and play devices
    • mdmonitor not needed unless running software RAID

    Evaluate their worth even more closely before disabling them.

    chkconfig xinetd off
    chkconfig acpid off
    chkconfig microcode_ctl off
    chkconfig haldaemon off
    chkconfig messagebus off
    chkconfig mdmonitor off
    

    Virtual Terminals

    You may also minimize on virtual terminals. The default is six virtual terminals. You can probably do with two. To disable them, edit the /etc/inittab file and comment out the ones that you do not want running like this:

    # Run gettys in standard runlevels
    1:2345:respawn:/sbin/mingetty tty1
    2:2345:respawn:/sbin/mingetty tty2
    #3:2345:respawn:/sbin/mingetty tty3
    #4:2345:respawn:/sbin/mingetty tty4
    #5:2345:respawn:/sbin/mingetty tty5
    #6:2345:respawn:/sbin/mingetty tty6
    

    Updating and Rebooting

    On any new install, it is a good idea to run “yum update” and then reboot the machine to apply the latest security and software updates. It is a good idea to reboot after the update to make sure that the system comes up properly.

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