Centos 7 Novice on the road

First, Centos 7 modify SSH port number

1, modify the/etc/ssh/sshd_config

Vi/etc/ssh/sshd_config

#Port 22 Add the following line under this line

Port 7156//Add this line below

2. Modifying SELinux

Use the following command to view the SSH ports currently allowed by SELinux:

Install Semanage,

Yum-y Install Policycoreutils-python

Semanage port-a-t ssh_port_t-p TCP 7156

And then make sure you add it in.

Semanage Port-l | grep ssh

If successful will output

ssh_port_t TCP 7156, 22

3. Restart SSH

Systemctl Restart sshd (systemctl restart Sshd.service)

4. Firewall Open SSH port

Firewall-cmd--zone=public--add-port=7156/tcp--permanent

Firewall-cmd--reload

Firewall-cmd--list-all-zones |grep 7156//View Results

Second, no ifconfig command, use Yum Search ifconfig query Package

Yum-y Install Net-tools

Third, hostname Save the Directory

/etc/hostname

Centos 7 Novice on the road