CentOS

CentOS – How do I safely delete old kernel versions ?

package-cleanup: Using package-cleanup command which is a part of yum-utils package we can uninstall any number of old kernels automatically. As an example using --oldkernels --count=2 option with package-cleanup command the command…
ZFS ZOL

ZFS – CENTOS Downgrade

ZFS - Downgrade Commands for Centos: To do the downgrade/re-install dance: [crayon-68727b46a6a00460890448/] [crayon-68727b46a6a08518515472/] [crayon-68727b46a6a0b405667978/]
ZFS ZOL

ZFS – Tuning

ZFS tuning for SAS3 Storage Tank [crayon-68727b46a6e19534084029/] ZFS tuning for SAS3 ALL SSD + nVME Storage Tank [crayon-68727b46a6e21158717011/] Some more good advice: SvennD ZFS-Discuss
ZFS ZOL

ZFS – SNMP

ZFS - SNMP Extend Commands: [crayon-68727b46a720f373054738/] LibreNMS: https://community.librenms.org/t/zfs-support/1839 https://docs.librenms.org/#Extensions/Applications/#zfs

CentOS – NIC Teaming with LACP

A Comparison of Features in Bonding and Team Feature Bonding Team broadcast Tx policy Yes Yes round-robin Tx policy Yes Yes active-backup Tx policy Yes Yes LACP (802.3ad) support Yes (active only) Yes Hash-based…

Debian – How do you select the fastest mirror from the command line?

I want to update my sources.list file with the fastest server from the command line in a fresh Ubuntu Server install. I know this is trivially easy with the GUI, but there doesn't seem to be a simple way to do it from from the command line? [crayon-68727b46a7afc174948901/] Automated…
github

Git – use a proxy

Configure Git to use a proxy ##In Brief You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'. Consider…

Linux – iproute2 Cheat Sheet

Overview iproute2 is the Linux networking toolkit that replaced net-tools (ifconfig, route, arp etc.) Old style network utilities like ifconfig and route are still there just for backwards compatibility and do not provide access to…
Linux File Permissions

Linux – Permissions

  In order to update and change file permissions, you can use the chmod command. The format of the command is as follows: [crayon-68727b46aae5f885331710/] for each action   Changing Permissions VALUE MEANING rwx+ugo No…

Debian – How to disable snmpd ia_addr insert messages?

You have Debian and Ubuntu servers which runs snmpd service and are getting following message every 30 seconds within /var/log/syslog [crayon-68727b46ab34a886458159/] This problem is related with the log level start options of snmpd service [crayon-68727b46ab352017075378/] With…