{{tag>[linux monitoring check_mk centos7]}}
=====Check_MK monitoring (raw rpm) - CentOS7=====
Use this guide to install the latest RAW version of Check_MK.


====Install OS====
  * Configure your network.
  * Configure NTP.
  * Disable SELinux. Normally i would let SELinux be enabled, but with a monitoring system it is one of the few exceptions I make. This service does too many things SELinux doesn't like.
  * Configure EPEL repository.
  * Create a separate /opt filesystem.

====Install Check_MK====
  * Install fonts (for RRD graphs):<code>yum install dejavu-fonts-common dejavu-sans-mono-fonts dejavu-lgc-sans-mono-fonts</code>
  * Download the latest CRE (Check_MK Raw Edition) for CentOS 7.
  * Install the CRE RPM: <code>yum localinstall check-mk-raw-1.2.6p4-el7-34.x86_64.rpm</code>
====Configure CRE====
  * Create a production site:<code># omd create prod
Adding /opt/omd/sites/prod/tmp to /etc/fstab.
Restarting Apache...OK
Creating temporary filesystem /omd/sites/prod/tmp...OK
Created new site prod with version 1.2.6p4.cre.

  The site can be started with omd start prod.
  The default web UI is available at http://monitor.mgmt.dc.polaire.nl/prod/
  The admin user for the web applications is omdadmin with password omd.
  Please do a su - prod for administration of this site.</code>
  * Start the prod site:<code>omd start</code>
  * Configure the site:<code>omd config</code>

====Firewall====
  * Open the appropriate firewall ports (eg. port 80/443)

====Upgrade Check_MK====
  * Download the new version, for example: check-mk-raw-1.2.6p6-el7-34.x86_64.rpm
  * Install the new version:<code>rpm -ivh check-mk-raw-1.2.6p6-el7-34.x86_64.rpm</code>
  * Switch to site user (prod):<code>su - prod</code>
  * Stop OMD:<code>omd stop</code>
  * Update OMD, select the newer version:<code>omd update</code>
  * Check versions:<code>OMD[prod]:~$ omd versions
1.2.6p4.cre
1.2.6p5.cre
1.2.6p6.cre (default)</code>
  * Start OMD:<code>omd start</code>
  * Test!