Saturday, July 24, 2021

How to

How to Kill MySQL Queries

MySQL queries can sometimes be long-running and may prevent transactions from accessing necessary tables to complete a...

How to Fix Moodle error backup_controller_dbops_nonexisting

This error occurs when you duplicate an activity or import activities. I recently implemented...

How to fix Ceph error states “oldest is osd_failure(failed timeout osd.xx)

Hi, If your Ceph cluster encounters a slow/blocked operation it will log it and set the cluster health into...

Monitor site to site tunneling health for Cisco ASA using Zabbix

Requirement : - Zabbix server ( Zabbix 2.4 in this post)- Cisco ASA with tunnel site to site configured-...

How to Backup view and events only in MariaDB/MySQL

As a part of a migration, We need to export MySQL events from a MariaDB 10.2 and import them to another MariaDB...

How to Resize tmpfs on Linux

tmpfs is a temporary file system that stores data in virtual. It does not create an file or directory on your hard...

Proxmox 6.0 Bug, hung kernel and how to fix it.

We have been running Proxmox 6.0 in some servers and after a few weeks, they were having a hung issue. one-by-one all...

Delete OLD data from Zabbix database

If you are using Zabbix for a long time, then you might notice that the database size of Zabbix is increasing every day. Then...

Unable to start MySQL on Ubuntu: AVC apparmor=”DENIED” operation=”open”

MySQL on Ubuntu fails to start. The following error messages are shown in the output of the journalctl -xecommand: AVC...

Converting between image formats

qemu-img convert: raw, qcow2, qed, vdi, vmdk, vhd The qemu-img convert command can do conversion between multiple formats, including qcow2, qed, raw, vdi, vhd, and vmdk.

Migrate MyISAM tables to INNODB using mysqldump

In this article you will find information how to convert MyISAM tables to INNODB.  The procedure here is an...

Test TCP Port 25 (smtp) access with telnet

In this article I show you how to use telnet to test the access to a mail server on TCP port 25.
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MegaCLI CheatSheet

How to show all LSI RAID info with MegaCLI: Show basic configuration: /opt/MegaRAID/MegaCli/MegaCli64 -LDInfo -Lall -aAll

Proxmox 5x “e1000 driver hang” fix

Problem: I started to experience proxmox servers going up and down, an intermittent response on the network (SSH),...

How To Fix “Device eth0 does not seem to be present, delaying initialization” Error on Centos

check network: # ifconfig lo        Link encap:Local Loopback           inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP...

Create Blocking Bad Bots Through Apache in WHM/cPanel

we see a lot of traffic from 'bad robots', these bots cause problems such as high server load, server instability and can...