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SysOps

How to display dependencies for deb package

Use dpkg to pretty print package dependencies.

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How to define allowed HTTP methods on HAProxy

Define allowed HTTP methods on HAProxy load balancer using simple Access Control Lists.

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How to encrypt user password

Use encrypted passwords to automatically setup users using configuration management tools like Puppet or Ansible.

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How to monitor SSL certificates using icinga2

Create custom data field to define multiple domain names and service apply rule to verify those SSL certificates.

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How to install UniFi controller

Install UniFi controller to configure wireless network using Ubiquiti devices.

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How to setup icinga2 master-satellite-client using director module

Icinga2 documentation clearly describes the master->satellite->client setup, but as of now everything can be configured using director module and top down approach, so you can easily monitor external remote networks that are not accessible from the master server.

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SysOps

How to parse free output to display available memory

The free utility is used to display the amount of free and used memory in the system. Debian Stretch provides an upgraded package. Output format has changed, and available memory is calculated using a different method, so let’s see what we can do with these modifications at this moment.

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How to add your first host using icinga2 director

Add your first host using icinga2 director after performing clean installation as I have described earlier this month – icinga2 plus icingaweb2 and director module installation procedure.