Linux 集群免密配置脚本

参考自：https://blog.csdn.net/zhanggqianglovec/article/details/103384458

准备工作：

1. 安装expect
   yum install expect -y

#!/usr/bin/bash

expect << EOF
set timeout 10
# 创建公有密钥	
spawn ssh-keygen -t rsa
expect {
        "*to save the key" {send "\n";exp_continue}
        "*(y/n)" {send "y\r";exp_continue}
        "Enter passphrase" {send "\n";exp_continue}
        "Enter same passphrase" {send "\n";exp_continue}
}
EOF
 
#  获取/etc/hosts文件中除localhost的映射关系
ip_list=`grep -v 'localhost' /etc/hosts | awk -F ' ' '{print $1,$2}'`
for ip in $ip_list
do
expect << EOF
        set timeout 2
        # 发送公有密钥
        spawn ssh-copy-id root@$ip
        expect {
                "yes/no" {send "yes\r";exp_continue}
                "password" {send "root\r";exp_continue}
        }
	
        # 拷贝/etc/hosts文件到远程机器
        spawn scp /etc/hosts $ip:/etc
        expect {
                "yes/no" {send "yes\r";exp_continue}
                "password" {send "root\r";exp_continue}
        }
EOF
done

 #!/usr/bin/bash
 
#ip列表&登录密码
passwd='huqy'
ip_list=("192.168.88.128" "192.168.88.130" "192.168.88.131")


for ip in ${ip_list[*]}
do
 # 生成秘钥对
 expect << EOF
   set timeout 2
   spawn ssh root@$ip
   expect {
      "yes/no" { send "yes\n";exp_continue }
      "password" { send "$passwd\n"}
   }
   expect {
      "*#" {send "ssh-keygen -t rsa\r";exp_continue}
      "*to save the key" {send "\n";exp_continue}
      "Overwrite (y/n)" {send "y\r";exp_continue}
      "Enter passphrase" {send "\n";exp_continue}
      "Enter same passphrase" {send "\n"}
   }
   expect {"*#" {send "exit\r"}}
EOF

done