Create DKIM in PowerMTA

To generate DKIM, run the command This will create 2 files. private.pem and public.pem Create a file and copy the

Change SMTP port in PowerMTA

To change SMTP port in PowerMTA, edit file vi /etc/pmta/config Find line starting with smtp-listener This line specify port used

Create SMTP user in PowerMTA

Once you have PowerMTA installed, you need to create SMTP user. To create an SMTP user, edit file vi /etc/pmta/config

Disable cPHulk Brute Force Protection

Cpanel Servers have a bruceforce attack detection module called cPHulk Brute Force Protection. In case your server have another bruteforce

Apache Auto Renew SSL on Password Protected site

I have a web site that is password protected using Apache basic autenticiation. I used following code in Apache config

Modify Apache Virtual Host for a site in Cpanel Server

On Cpanel server Apache configuration file get recreated every time you modify or add a new web site. In cause

MariaDB Change Open Files Limit

When using systemctl, you can set value for open_files_limit in my.cnf file. Default installation of MariaDB 10 have open_files_limit set

Configure Cpanel Server service using whmapi1

To disable monitoring of MySQL service, run whmapi1 configureservice service=mysql enabled=1 monitored=0 This wil prevent MySQL service get auto started.

Firewalld

firewall-cmd is used to manage firewall (iptables). It is used by default on latest version of CentOS, RHEL. Check firewall

Firewalld list all open ports

To list all open ports in firealld, run firewall-cmd –list-ports You may need to also use [root@oc1 ~]# firewall-cmd –list-services

Install Xfce VNC remote desktop on CentOS 7

Xfce is a lightweight linux desktop environment. You can install Xfce on a remote server or virtual machine, connect to

Firewalld list rules

To list rules use command firewall-cmd –list-all –zone=public To list all open ports firewall-cmd –list-ports Example [root@centos7 zones]# firewall-cmd –zone=public