GitLab CICD Day 19 - SSH免密登录远程服务器

1. 生成ssh-key (服务器A & B)

[root@qa onpremise]# ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
/root/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:VKJse879Ea0aSnRhyhziJih9bncJ+TXdV+36PYEGWus root@qa
The key's randomart image is:

2. 获取public key (服务器A)

[root@qa .ssh]# more id_rsa.pub 
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCvul1XiuAkoQP18ouUVEDGmz5MQjf/Fd55s4QYZJvXq9o5dCwhZ9nwwGFCU5ZWkHeFIYBjx1dqAaOXXZOMorV5n0w8OaooXPEV4S2GOa
llrdrRgXKTUbYZBs61GPF42K25TyEUHG9kmv86qN65BKjvtFGSlCYGE7nnkgDXyKQYlY9OVT2Ip8Vcs/JY1KBkYr0lj21oTk8yJILs/M/Xl3Vov0h/nclaJBAnMXuV6qm9T0BsuuUOVoba
BShHvEwVVkzsSYCffyalC6qZ5Ow1NqQipcLOFBcatt8w6Gsp4zuF9m2+GGufosFe2WJFGiUoDdVPWhNrSpnezyQTsw4bajdf root@qa
[root@qa .ssh]# 

3. 把public key 拷贝到目标机器(服务器A->B)

[root@qa ~]# scp /root/.ssh/id_rsa.pub 172.16.128.153:/root/.ssh/authorized_keys
root@172.16.128.153's password: 
id_rsa.pub                                                                                                  100%  389    23.6KB/s   00:00    
[root@qa ~]# 
[root@qa ~]# 
[root@qa ~]# 
[root@qa ~]# 
[root@qa ~]# 
[root@qa ~]# ssh 172.16.128.153                        # 测试免密成功
Last login: Sat Feb 11 06:13:48 2023 from 172.16.128.116