一条命令配置好ssh免密登陆

无跳板机

ssh $user@$target -p 1220 'mkdir -p .ssh && cat > .ssh/authorized_keys' < ~/.ssh/id_rsa.pub

user是登陆名,target是目标机器.第一次输好密码,后面就不用输了.

经过跳板机

• 在~/.ssh/config中配置好别名

Host gateway
    HostName gateway url
    Port 1220
    IdentityFile ~/.ssh/id_rsa
    User xxx

Host target
    HostName target url
    User xxx
    IdentityFile ~/.ssh/id_rsa
    ProxyCommand ssh gateway nc %h %p 2> /dev/null

• 执行命令

ssh target 'mkdir -p .ssh && cat > .ssh/authorized_keys' < ~/.ssh/id_rsa.pub

和上面同样,也只须要第一次输入密码