linux免密

需求：Linux免密登陆192.168.31.131

#生成ssh免密，回车即可
ssh-keygen -t rsa
#拷贝id_rsa.pub到目标服务器
scp -P 22 /root/.ssh/id_rsa.pub root@192.168.31.131:/root/.ssh/authorized_keys
#修改/root/.ssh权限为700，authorized_keys权限为644
#尝试登陆
ssh -p 22 root@192.168.31.131
#普通用户免密同理，将/root/.ssh变更为/home/用户名/.ssh

yum -y install openssh-clientsansible
#1.生成私钥
[root@server ~]# ssh-keygen 
#2.向主机分发私钥
[root@server ~]# ssh-copy-id root@192.168.37.122 -p 22
[root@server ~]# ssh-copy-id root@192.168.37.133 -p 22

Linux免密使用sudo

#增加所需用户名一行，NOPASSWD即无需密码
visudo
root    ALL=(ALL)       ALL
ideal        ALL=(ALL)       NOPASSWD: ALL

批量发送免密

vim hostname.txt
192.168.37.134 root 123456
192.168.37.135 root 123456

vim ssh.sh
#!/bin/bash
cat hostname.txt | while read ip user pwd;
	do 
		sshpass -p $pwd ssh-copy-id -p 22 ${user}@${ip} -o StrictHostKeyChecking=no
	done

sh ssh.sh