ProCKSI

h1. 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:

<pre>

  #The proxy server – proxy server:port

  proxy=http://wwwcache.cs.nott.ac.uk:3128

</pre>

* Modify _/etc/yum.repos.d/CenOS-Base.repo_ in order to allow a local mirror to be used for the updates:

<pre>

  baseurl=http://earth.cs.nott.ac.uk/ …

</pre>

* For automatic nightly, install the _yum-cron_ package. Enter at the command line of the master node and each slave node:

<pre>

  yum  install  yum-cron

</pre>

* Make the _yum_ daemon start at boot time. Enter at the command line of the master node and each slave node:

<pre>

  chkconfig  --add  yum 

  chkconfig  yum  on

</pre>

* Start the _yum_ daemon. Enter at the command line of the master node and each slave node:

<pre>

  /sbin/service  yum  start

</pre>

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:

<pre>

  chkconfig  yum-updatesd  off

</pre>

* Stop the _yum-updatesd_ daemon. Enter at the command line of the master node and each slave node:

<pre>

  /sbin/service  yum-updatesd  stop

</pre>