准备四台服务器:
docker0
docker1
docker2
docker3
在docker0服务器上生成公钥和私钥
[root@www ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
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:QX9zBwLmVNRXXbgPLmPZr4515rXXe/GmmpYbc6k3tU8 root@www.yhchange.com
The key's randomart image is:
+---[RSA 2048]----+
| . +++...*|
| . = .o.o|
| . o o .o.|
| . . oo. |
| S + o |
| = ooo|
| .o++oE|
| oOo*X|
| .*=+BB|
+----[SHA256]-----+
生成的公钥和私钥存储在/root/.ssh目录下面
[root@www ~]# cd /root/.ssh
[root@www .ssh]# ll
总用量 8
-rw-------. 1 root root 1679 8月 13 14:41 id_rsa
-rw-r--r--. 1 root root 403 8月 13 14:41 id_rsa.pub
验证下自己登录自己是否成功:
[root@www ~]# ssh-copy-id 192.168.1.100
(二) 节点docker0上的公钥与私钥拷贝到其他三台机器
scp -pr .ssh/ 192.168.1.101:root/
scp -pr .ssh/ 192.168.1.102:root/
scp -pr .ssh/ 192.168.1.103:root/
(三)验证
[root@www ~]# ssh 192.168.1.101
Last login: Sun Aug 13 14:33:16 2023 from 192.168.1.5
[root@www ~]# ifconfig
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.101 netmask 255.255.255.128 broadcast 192.168.1.127
inet6 2409:8a00:79a4:9290:20c:29ff:feb7:c791 prefixlen 64 scopeid 0x0<global>
inet6 fe80::20c:29ff:feb7:c791 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:b7:c7:91 txqueuelen 1000 (Ethernet)
RX packets 5059 bytes 391546 (382.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2130 bytes 223968 (218.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
从docker1再次回到节点docker0
[root@www ~]# exit
登出
Connection to 192.168.1.101 closed .
[root@www ~]# ifconfig
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.100 netmask 255.255.255.128 broadcast 192.168.1.127
inet6 2409:8a00:79a4:9290:c586:1ca9:1eb9:7cd1 prefixlen 64 scopeid 0x0<global>
inet6 fe80::41b2:5b2a:c067:9234 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:df:cc:db txqueuelen 1000 (Ethernet)
RX packets 6262 bytes 500539 (488.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3157 bytes 362677 (354.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 313 bytes 57926 (56.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 313 bytes 57926 (56.5 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
至此，多台服务器之间可以免密登录,相互拷贝