ProCKSI

= System Updates =
The operating system of the master node and each slave node must be configured to be updated automatically with security relevant patches.

• Modify ''/etc/yum.conf'' in order to allow connections through the proxy server: {{{
  #The proxy server – proxy server:port
  proxy=http://wwwcache.cs.nott.ac.uk:3128
  }}}

• Modify ''/etc/yum.repos.d/CenOS-Base.repo'' in order to allow a local mirror to be used for the updates: {{{
  baseurl=http://earth.cs.nott.ac.uk/ …
  }}}

• For automatic nightly, install the ''yum-cron'' package. Enter at the command line of the master node and each slave node: {{{
  yum install yum-cron
  }}}

• Make the ''yum'' daemon start at boot time. Enter at the command line of the master node and each slave node: {{{
  chkconfig --add yum
  chkconfig yum on
  }}}

• Start the ''yum'' daemon. Enter at the command line of the master node and each slave node: {{{
  /sbin/service yum start
  }}}

Note that ''yum-updatesd'' is the new daemon for nightly updates.

• Disable ''yum-updatesd'' to start up at boot time. Enter at the command line of the master node and each slave node: {{{
  chkconfig yum-updatesd off
  }}}

• Stop the ''yum-updatesd'' daemon. Enter at the command line of the master node and each slave node: {{{
  /sbin/service yum-updatesd stop
  }}}