Centos

Static IP Address

Edit: /etc/sysconfig/network-scripts/ifcfg-[interface_name]

TYPE=Ethernet

BOOTPROTO=static
NAME=eno2
UUID=a6a9b6a7-5215-4cf1-9f74-3d03559674a9
DEVICE=eno2
ONBOOT=yes

IPADDR=10.13.65.246
NETMASK=255.255.255.0
GATEWAY=10.13.65.1
DNS1=1.1.1.1
DNS2=8.8.8.8

After Editing the file restart networking:

sudo systemctl restart network

Hostname

See current hostname: hostname

Edit: vi /etc/hostname

Validate with: hostnamectl

A restart is often required or logout of your current SSH session and log back in.

Firewall

Add Port/Protocol Permanently:

firewall-cmd --add-port=xxxx/tcp --permanent 

NOTE: YOU MUST RESTART THE SERVICE FOR CHANGES TO TAKE EFFECT!!!

systemctl restart firewalld.service

[root@hostname ~]# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ens192
  sources:
  services: cockpit dhcpv6-client snmp ssh
  ports: 9200/tcp
  protocols:
  forward: no
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules: