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Execute a required reboot, with Ansible (CentOS/Red Hat)

A while ago I blogged about executing a reboot using Ansible on Debian-based operating systems. That is necessary after certain updates, as example after installing a new kernel. Turns out that things are very easy on Debian, compared to Red Hat based systems (Red Hat and CentOS in my case).

First of all, there is no clear indicator if a reboot is required. People work around this problem by creating overly complicated scripts. The needs-restarting tool in newer versions provides the -r option to indicate if a reboot is required. But the CentOS 7 I’ve just installed does not come with this version.

Greenplum Community Edition - Connections from the host system into the virtual machine

If you download the Greenplum Community Edition (GP CE) from the Greenplum website and if you want to connect tools like pgAdminIII from your host machine to the database inside the virtual machine, you have to disable the firewall. The CE is installed on CentOS and by default the firewall is enabled and blocks connections from outside to most ports.

Here are the steps which are required to disable the firewall:

Find out the package size

Just installed a small CentOS 5 without additional packages and the 4 GB VMWare disk is almost full :-(