rhel 7配置使用ssh-key登录

首先生成公钥私钥

ssh-keygen

然后ssh-add

eval $(ssh-agent)
ssh-add -L
ssh-add /root/.ssh/kyour_pri_key
ssh-add -L

拷贝到远端rhel,并且保证sshd 的选项正常

ssh-copy-id -i /root/.ssh/kobe_rsa_key.pub root@another_rhel_ip

RSAAuthentication yes
PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys

搞定。
远程执行命令

ssh -q -o BatchMode=yes -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no root@IPADDR "ps -ef"
ssh -q -o BatchMode=yes root@IPADDR "ps -ef"

debug 可以这样

ssh -vvv root@another_rhel_ip

#注意：
这样的做法，只在当前bash环境下生效。其他的bash环境下无效。