Centos7 Frequent Operations

wanmyj / February 2023

CentOS7的常用shell操作

创建RSA密钥对，把公钥给其他服务使用

Shell命令 ssh-keygen -t rsa -b 4096 ，一路回车
查看生成的公钥 cat ~/.ssh/id_rsa.pub 发给其他要登录这台机器的设备 ssh-copy-id <username>@<machine_b_ip>

使用其他设备的公钥，配置ssh登录后台

Shell命令 vi /etc/ssh/sshd_config
取消注释 PubkeyAuthentication yes
找到下面一行 AuthorizedKeysFile xxxxx

一般是 AuthorizedKeysFile .ssh/authorized_keys

然后cd ~/.ssh/ && vi authorized_keys
另起一行，把其他设备的公钥粘贴在里面，esc :wq 退出
重新加载一下sshd 就可以了 service sshd reload

打印IP address

ip_address=$(ifconfig | grep -oP 'inet \K[\d.]+')
echo $ip_address

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