Categories
SysOps

How to fix device excluded by a filter

Fix “device excluded by a filter” LVM error.

Categories
SysOps

How to create the simplest possible nftables firewall

Create the simplest possible firewall using nftables framework with relaxed rules that will allow all outgoing traffic, incoming ICMP echo requests, and ssh connections.

Categories
SysOps

How do display physical volumes associated with the volume group

Display physical volumes associated with the volume group.

Categories
SysOps

How to use templates inside shell scripts

Use templates inside shell scripts by substituting environment variables.

Categories
SysOps

How to lock specified packages from being updated

Use versionlock plugin to protect packages from being updated on the CentOS operating system.

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 define JAVA_HOME

Determine and set JAVA_HOME to execute Java command-line applications.

Categories
SysOps

How to restart service on every configuration change

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

Categories
SysOps

How to fix multipath daemon error about missing path when using VirtualBox

Fix multipath daemon error about missing path when using VirtualBox.

Categories
SysOps

How to log specific Varnish requests

Use varnishlog to log specific Varnish requests.