设置远程ssh访问不需要密码

设置远程ssh访问不需要密码 1、创建SSH Key(已有则不需要创建)

//命令
ssh-keygen -t rsa       <== 建立密钥对，-t代表类型，有RSA和DSA两种

//执行过程
[root@localhost ~]# ssh-keygen -t rsa       <== 建立密钥对，-t代表类型，有RSA和DSA两种
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):   <==密钥文件默认存放位置，按Enter即可
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):     <== 输入密钥锁码，或直接按 Enter 留空
Enter same passphrase again:     <== 再输入一遍密钥锁码
Your identification has been saved in /root/.ssh/id_rsa.    <== 生成的私钥
Your public key has been saved in /root/.ssh/id_rsa.pub.    <== 生成的公钥
The key fingerprint is:
SHA256:K1qy928tkk1FUuzQtlZK+poeS67vIgPvHw9lQ+KNuZ4 [email protected]
The key's randomart image is:
+---[RSA 2048]----+
|           +.    |
|          o * .  |
|        . .O +   |
|       . *. *    |
|        S =+     |
|    .    =...    |
|    .oo =+o+     |
|     ==o+B*o.    |
|    oo.=EXO.     |
+----[SHA256]-----+
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版权声明：本文为CSDN博主「独孤柯灵」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/u014721096/article/details/78553032

2、copy生成的key到远程主机

//命令
ssh-copy-id -i ~/.ssh/id_rsa.pub root@主机地址

//执行过程
[root@localhost ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '172.16.8.11 (172.16.8.11)' can't be established.
ECDSA key fingerprint is SHA256:IpS8Vw0F/Yxece36yQ9KhoIuxHFjSi/Ect/WHGxw//k.
ECDSA key fingerprint is MD5:03:85:10:9a:21:75:d6:f1:7a:6e:fd:a8:08:c5:ef:59.
Are you sure you want to continue connecting (yes/no)? yes     <== 是否继续连接，回答为yes  
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]'s password:    <==输入远程主机的密码

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.