Author Archives: LinuxTech

Redirect from www to non www with https

To Redirect from www to now www with https follow below steps

open .htacess file and add below rule

Replace domain.tld with your domain name

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.domain.tld [NC]
RewriteRule ^(.)$ http://domain.tld/$1 [L,R=301]

RewriteCond %{HTTPS} !=on

RewriteRule ^(.)$ https://%{HTTP_HOST}/$1 [L,R=301]

Change Postfix Mail IP address

Change postfix mail sending IP

To change mail IP in Postfix need to change parameters in below file

vi /etc/postfix/

add this option


once done restart postfix

Installing Python 3.4 on cPanel

cPanel comes with Default version Python 2.7

If you want to install second version Python 3.4 on server using rpm and via Source

First install epel repository

yum install epel-release

yum install python34

To install PIP on python2.4

yum install python3-pip

Disable ProxyPass cpanel

You can disable the Proxypass from httpd.conf using below command

This issue occurs in live migration in cpanel to cpanel server

whmapi1 unset_all_service_proxy_backends username=cpanelusername

mysqld: Can’t create/write to file ‘/var/run/mysqld/’

One of our server had Mysql failing to start on reboot with below error

tail -n 100 /var/log/mysqld.log
2022-03-08 3:53:37 0 [Note] Crash recovery finished.
2022-03-08 3:53:37 0 [Note] Server socket created on IP: ‘’.
2022-03-08 3:53:37 0 [ERROR] mysqld: Can’t create/write to file ‘/var/run/mysqld/’ (Errcode: 2 “No such file or directory”)
2022-03-08 3:53:37 0 [ERROR] Can’t start server: can’t create PID file: No such file or directory
2022-03-08 3:58:38 0 [Note] InnoDB: Using Linux native AIO
2022-03-08 3:58:38 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

Solution to this was

Create a new folder mkdir -p /var/run/mysqld/

Chown mysql.mysql /var/run/mysqld/

[root@ok1146s1 run]# mkdir /var/run/mysqld
[root@ok1146s1 run]# chown mysql:mysql /var/run/mysqld/
[root@ok1146s1 run]# /scripts/restartsrv_mysql
Waiting for “mysql” to start ……waiting for “mysql” to initialize ………finished.

Service Status
mariadb (/usr/sbin/mysqld) is running as mysql with PID 5809 (systemd+/proc check method).

Startup Log
Mar 08 04:08:14 systemd[1]: Starting MariaDB 10.3.34 database server…
Mar 08 04:08:16 mysqld[5809]: 2022-03-08 4:08:16 0 [Note] /usr/sbin/mysqld (mysqld 10.3.34-MariaDB) starting as process 5809 …
Mar 08 04:08:17 systemd[1]: Started MariaDB 10.3.34 database server.

mysql started successfully.
[root@ok116s1 run]#

Service Unavailable

Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.

While accessing one of the website saw the error mentioned above

Normally this 503 error are related to module PHP-fpm.

You just need to restart it from WHM to fix the issue

PHP Fatal error: Uncaught Error: Call to undefined function wp()

This issue is due to some core files in wordpress being corrupt.

The solution to this issue is to download new version of wordpress and upload new files and folders mentioned below

wp-includes , wp-admin and below files


This resolved the issue and wordpres site was working fine

Inoddb recovery from crash

We had a Inoddb database crash in server , Where Mysqld was not starting.

So first we checked on what databases tables are crashed or corrupted using

command mysqlcheck -A –all-databases and repaired it using

mysqlcheck --auto-repair –all-databases

You can check in below URL for additional functions using mysqlcheck

First thing we did was got mysql in recovery mode using innodb_force

As with 0,1,2 mysql was not coming up we used value 3 to get innodb online in read only mode.

innodb_force_recovery = 3

now as mysql was online we made a full dump of mysql which include all databases

mysqldump –all-databases > all_databases.sql

Once complete dump was ready

We stopped the Mysql services using below command

whmapi1 configureservice service=mysql enabled=1 monitored=0

,We moved the the

mv /var/lib/mysql /var/lib/bkp_mysql

/scripts/restartsrv_mysql –stop

We now reinitialized the mysql using below command

mysqld –initialize –user=mysql

Now we restored the dump which we had created using command

Mysql Mysql < all_databases.sql

After the dump was restored , The mysql was restarted

/scripts/restartsrv_mysql –start

whmapi1 configureservice service=mysql enabled=1 monitored=1

Mysql root password was reset using below command