Centos7.x 修改hostname

1. 修改hostname

hostnamectl set-hostname new_host_name

2. 关闭防火墙

systemctl status firewalld
systemctl stop firewalld
systemctl disable firewalld

3. 配置host

192.168.40.x  nx

4. 配置免密

ssh-keygen
ssh-copy-id -i id_rsa.pub nx  # 注意不同用户的authorized_keys不一样