Categories
SysOps

How to fix device excluded by a filter

Fix “device excluded by a filter” LVM error.

Categories
DevOps

How to install Nexus Repository Manager 3

Install Nexus Repository Manager (NXRM) 3.

Categories
SysOps

How to use templates inside shell scripts

Use templates inside shell scripts by substituting environment variables.

Categories
SysOps

How to display strace summary

I have already described how to strace PHP-FPM processes, but you can also display a strace summary to get detailed information about count time, calls, and errors for each syscall.

Categories
SysOps

How to restart service on every configuration change

Monitor file system events to restart service on every configuration change.

Categories
Uncategorized

How to store and visualize playbook events

Use JUnit callback plugin to store and Allure Framework to visualize ansible playbook events.

Categories
Uncategorized

How to pretty print decimal or binary numbers

Use numfmt command-line utility which is a part of the standard GNU Core Utilities to pretty print decimal or binary numbers.

Categories
SysOps

How to log specific Varnish requests

Use varnishlog to log specific Varnish requests.

Categories
SysOps

How to use virtual memory filesystem to store Varnish Shared memory Log

Varnish Shared memory Log can put a major strain on the disk (I/O write operations). The solution is to store it on the virtual memory filesystem.

Categories
SysOps

How to determine which services need to be restarted

Use needrestart utility to determine which services need to be restarted after the upgrade.