? ? ? ? ? ? ? ??

準備四臺服務器:

docker0

docker1

docker2

docker3

在docker0服務器上生成公鑰和私鑰

[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]-----+

生成的公鑰和私鑰存儲在/root/.ssh目錄下面
[root@www ~]# cd /root/.ssh
[root@www .ssh]# ll
總用量 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

驗證下自己登錄自己是否成功:

[root@www ~]# ssh-copy-id 192.168.1.100

---

(二) 節點docker0上的公鑰與私鑰拷貝到其他三臺機器

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)驗證

[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

---

從docker1再次回到節點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，多臺服務器之間可以免密登錄,相互拷貝