firewalld blocking snmp and fixing it (with ansible)

Some time ago I had to use a new CentOS 7 virtual-machine for some things that aren’t relevant to this post. This machine had to run all the time but also had some problems with a sporadically failing application server. That’s why I decided to monitor the machine …

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Shrinking the (LVM) log-partition on Linux

Enlarging a LVM partition on a linux machine is trivial. You only need one command to do it and it can even be done when the partition is mounted.

lvresize -r -L +20G /vg1/lvm1

This command enlarges the LVM lvm1 to 20GB. Assuming you use an ext, ReiserFS or …

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