三台内网机对应IP和名称如下：
| 名称 | ip |
| Centos 7 MySQL Master | 192.168.79.134 |
| Centos 7 MySQL Slave | 192.168.79.136 |
| Centos 7 MySQLManager | 192.168.79.137 |
在上面三台机器上个添加/etc/hosts
192.168.79.134 mydb1
192.168.79.136 mydb2
192.168.79.137 mydb3任意找一台机器，生成ssh的key，然后复制到其他两台机器上：
[root@localhost ~]# pwd
/root
[root@localhost ~]# mkdir .ssh
mkdir: 无法创建目录".ssh": 文件已存在
[root@localhost ~]# cd .ssh/
[root@localhost .ssh]# ls
[root@localhost .ssh]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
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:
SHA256:7xiZZui/S6hW6yaYj+vo8bOYobUrg2Ie65n0Rh5EjuM [email protected]
The key's randomart image is:
+---[RSA 2048]----+
| |
| . |
| + |
| o o |
|. o S |
| E o .o + |
|.=+o..o.B . |
|B+#*ooo+ + |
|O&BO=+o.=o. |
+----[SHA256]-----+
[root@localhost .ssh]#
[root@localhost .ssh]#
[root@localhost .ssh]#
[root@localhost .ssh]#
[root@localhost .ssh]# cat id_rsa.pub >> authorized_keys随后赋予权限：
[root@localhost .ssh]# chmod 700 ~/.ssh
[root@localhost .ssh]# chmod 600 ~/.ssh/authorized_keys
[root@localhost .ssh]# cd ..将.ssh文件复制到其他2台主机上个：
[root@localhost ~]# scp -r .ssh 192.168.79.136:/root/
The authenticity of host '192.168.79.136 (192.168.79.136)' can't be established.
ECDSA key fingerprint is SHA256:ctYIvL3p2kOgf/2h8VbDCrHTJUqKcDNvNsLV/s+bJYQ.
ECDSA key fingerprint is MD5:76:cf:8a:bb:be:4c:b8:37:73:7c:05:48:11:de:33:2b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.79.136' (ECDSA) to the list of known hosts.
[email protected]'s password:
id_rsa 100% 1675 1.7MB/s 00:00
id_rsa.pub 100% 408 500.0KB/s 00:00
authorized_keys 100% 408 493.7KB/s 00:00
known_hosts 100% 176 181.8KB/s 00:00
[root@localhost ~]# scp -r .ssh 192.168.79.137:/root/
The authenticity of host '192.168.79.137 (192.168.79.137)' can't be established.
ECDSA key fingerprint is SHA256:ctYIvL3p2kOgf/2h8VbDCrHTJUqKcDNvNsLV/s+bJYQ.
ECDSA key fingerprint is MD5:76:cf:8a:bb:be:4c:b8:37:73:7c:05:48:11:de:33:2b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.79.137' (ECDSA) to the list of known hosts.
[email protected]'s password:
id_rsa 100% 1675 1.5MB/s 00:00
id_rsa.pub 100% 408 499.5KB/s 00:00
authorized_keys 100% 408 412.5KB/s 00:00
known_hosts 100% 352 399.2KB/s 00:00
[root@localhost ~]#测试通过ssh mydb1等测试下要不要密码：
[root@localhost ~]# ssh mydb1
The authenticity of host 'mydb1 (192.168.79.134)' can't be established.
ECDSA key fingerprint is SHA256:ctYIvL3p2kOgf/2h8VbDCrHTJUqKcDNvNsLV/s+bJYQ.
ECDSA key fingerprint is MD5:76:cf:8a:bb:be:4c:b8:37:73:7c:05:48:11:de:33:2b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'mydb1,192.168.79.134' (ECDSA) to the list of known hosts.
Last login: Sat Jun 6 10:37:55 2020
[root@localhost ~]# ssh mydb2
Last login: Sat Jun 6 10:50:04 2020 from mydb1
[root@localhost ~]# ssh mydb3
Last login: Sat Jun 6 10:50:51 2020 from mydb2
[root@localhost ~]#