This script is to monitor a failure when Nagios daemons fails to start or sometimes Nagios stops sending alerts. When you check the logs at "/usr/local/nagios/var/log/nagios.log" you might come across messages like "Caught SIGSEGV, shutting down". These messages need to be monitored and then fixed so that Nagios works in a proper fashion. This would be monitored via Cronjob on the host as Nagios itself won't be able to detect the failure.

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This article covers the setup and configuration of PuppetDB and Puppetmaster on separate nodes/hosts. I have used PostgreSQL as PuppetDB backend instead of HSQLDB as it's much easier to query and troubleshoot any issues you comes across especially when using Puppet exported resources. Follow this easy-to-follow guide and you should be up and running with a basic config of Puppetmaster and PuppetDB in no time.

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The process of upgrading Red Hat Satellite 5.6 to 5.7 is fairly simple if you follow the steps properly and have got enough space on the host while upgrading. There are many new features in Satellite 5.7 which includes integration of IDM for User Authentications and a major upgrade to the text editor which make it a hell of a lot easier to edit files PLUS the NEW User interface gives it a new life. 

NOTE: This guide is applicable only to Red Hat Enterprise Linux v6.x and above.

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This a very useful One liner command to insert IP and hostname into /etc/hosts file and is particularly useful when it comes to kickstart scripts wherein you need to have /etc/hosts entry for the newly provisioned VM and get it enrolled to various applications that include Red Hat IDM/ FreeIPA and Puppet to start with.

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Its a very quick process to update ESXi version to the latest. This procedure is completed via esxcli going through a SSH session to the Server. The update takes around 5-10mins depending on the hardware resources of the server and the failure is minimal. But not to say that the things wont go wrong so please make a BACKUP before you proceed.

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