root@node1:~# cat /etc/netplan/00-installer-config.yaml 
# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s3:
      dhcp4: no
      dhcp6: no
      addresses: [192.168.1.150/24]
      gateway4: 192.168.1.1
      nameservers:
              addresses: [114.114.114.114, 8.8.8.8]
  version: 2
root@node1:~#

输入命令：rpm -qa | grep ssh
　　注：若没安装SSH则可输入：yum install openssh-server安装。

[root@skycloud-1 ~]# rpm -qa | grep ssh
openssh-server-7.4p1-16.el7.x86_64
libssh2-1.4.3-12.el7_6.3.x86_64
openssh-7.4p1-16.el7.x86_64
openssh-clients-7.4p1-16.el7.x86_64
[root@skycloud-1 ~]#

输入命令：systemctl restart  sshd 重启SSH服务。
　　命令：systemctl start sshd 启动服务 |  命令：systemctl stop sshd 停止服务 
　　重启后可输入：netstat -antp | grep sshd 查看是否启动22端口（可略）。

[root@skycloud-1 ~]# systemctl restart  sshd
[root@skycloud-1 ~]#

输入命令：systemctl enable sshd 即可。
　　注：若是systemctl disable sshd 则禁止SSH开机启动。

[root@skycloud-1 ~]# systemctl enable sshd
[root@skycloud-1 ~]#

[root@bogon tmp]# chmod 400 skycloud.pem 
[root@bogon tmp]# ssh -i skycloud.pem centos@47.156.22.98
The authenticity of host '47.156.22.98 (47.156.22.98)' can't be established.
ECDSA key fingerprint is SHA256:bsqhV1RxWy+TPwSqTRdgxeyIorK1qEqazkPH3/V8kTE.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '47.156.22.98' (ECDSA) to the list of known hosts.
Last login: Thu Feb 27 05:06:22 2020 from 73.29.30.35
[centos@skycloud-1 ~]$

#允许使用密码登录
PasswordAuthentication yes
#允许root认证登录
PermitRootLogin yes

systemctl restart sshd

ssh-kengen
ssh-copy-id -i .ssh/id_rsa.pub  root@47.156.22.98