New to Centos 7

New to Centos 7

1. Modify the SSH port number in Centos 7

1. Modify/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. Modify SELinux

Run the following command to view the ssh ports allowed by SElinux:

Install semanage,

Yum-y installpolicycoreutils-python

Semanage port-a-t ssh_port_t-p tcp 7156

Then confirm whether to add it.

Semanage port-l | grep ssh

If it is successful

Ssh_port_t tcp 7156, 22

3. Restart ssh

Systemctl restart sshd (systemctl restart sshd. service)

4. Open the ssh port in firewall

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

Firewall-cmd -- reload

Firewall-cmd -- list-all-zones | grep 7156 // view the result

2. No ifconfig command. You can use yum search ifconfig to query the package.

Yum-y install net-tools

Iii. hostname storage directory

/Etc/hostname