使用使用shell脚本实现ssh免密登录
目录
1.expect命令:可以在外输入,某些命令执行后弹出的输入提示
1.expect命令:可以在外输入,某些命令执行后弹出的输入提示
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spawn shell 命令程序
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expect "捕获到shell 命令程序执行之后输出的字符串"
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send "发送给 shell 命令程序的字符串"
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[root@localhost .ssh]# ssh-keygen -t rsa -b 1024
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Generating public/private rsa key pair.
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Enter file in which to save the key (/root/.ssh/id_rsa):
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/root/.ssh/id_rsa already exists.
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Overwrite (y/n)?
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/usr/bin/expect << eof
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spawn ssh-keygen -t rsa -b 1024
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# 开始进连续捕获
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# 获取“Overwrite (y/n)?”的提示行,输入“y”表示同意(其中\n是换行符)
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expect {
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".ssh/id_rsa)" { send "\n"; }
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"Overwrite (y/n)?" { send "y\n"; }
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}
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# 结束捕获
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eof
2.使用expect命令来创建本地的公钥文件
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create_ssh_pub(){
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echo "生成本地ssh公钥"
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/usr/bin/expect << eof
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# 设置捕获字符串后,期待回复的超时时间
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set timeout 30
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spawn ssh-keygen -t rsa -b 1024
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## 开始进连续捕获
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expect {
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".ssh/id_rsa)" { send "\n"; exp_continue }
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"Overwrite (y/n)?" { send "y\n"; exp_continue }
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"no passphrase):" { send "\n"; exp_continue }
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"passphrase again:" { send "\n"; exp_continue }
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}
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eof
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}
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if [ ! -f /root/.ssh/id_rsa.pub ];then
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create_ssh_pub
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fi
3.复制ssh的公钥文件到各个主机上:
我的shell脚本在本机master上
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# 定义复制ssh公钥方法
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copy_ssh(){
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echo "复制公钥到对应的主机上"
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/usr/bin/expect << eof
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# 设置捕获字符串后,期待回复的超时时间
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set timeout 30
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spawn ssh-copy-id -i /root/.ssh/id_rsa.pub $1@$2
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## 开始进连续捕获
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expect {
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"connecting (yes/no)?" { send "yes\n"; exp_continue }
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"s password:" { send "${ssh_passwd}\n"; exp_continue }
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}
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eof
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}
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for name in ${ssh_networkname[*]};do
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timeout 5 ssh root@${name} "echo ${name}: 'This is success!'"
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if [[ $? -ne 0 ]];then
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echo "复制文件到: ${name}"
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copy_ssh root ${name} > /dev/null
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fi
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done
4.完整的shell脚本:
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#! /bin/bash
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ssh_hosts=(192.168.178.101 192.168.178.151 192.168.178.201)
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ssh_networkname=(master node1 node2)
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ssh_passwd=110119
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# 定义修改/etc/hosts文件的方法
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echo "开始修改地址映射"
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for ((i=0;i<${#ssh_hosts[*]};i ));do
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sed -i '/^'"${ssh_hosts[$i]}"'/d' /etc/hosts
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echo "尝试连接: ${ssh_networkname[$i]}"
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timeout 5 ssh root@${ssh_networkname[$i]} "echo ${ssh_networkname[$i]}: 'This is success!'"
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if [[ $? -ne 0 ]];then
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echo "添加地址映射:${ssh_hosts[$i]} ${ssh_networkname[$i]}"
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echo "${ssh_hosts[$i]} ${ssh_networkname[$i]}" >> /etc/hosts
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fi
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done
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expect -v
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if [ `echo $?` -ne 0 ];then
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echo "安装expect命令"
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yum install -y expect
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fi
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create_ssh_pub(){
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echo "生成本地ssh公钥"
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/usr/bin/expect << eof
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# 设置捕获字符串后,期待回复的超时时间
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set timeout 30
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spawn ssh-keygen -t rsa -b 1024
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## 开始进连续捕获
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expect {
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".ssh/id_rsa)" { send "\n"; exp_continue }
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"Overwrite (y/n)?" { send "y\n"; exp_continue }
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"no passphrase):" { send "\n"; exp_continue }
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"passphrase again:" { send "\n"; exp_continue }
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}
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eof
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}
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if [ ! -f /root/.ssh/id_rsa.pub ];then
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create_ssh_pub
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fi
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-
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# 定义复制ssh公钥方法
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copy_ssh(){
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echo "复制公钥到对应的主机上"
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/usr/bin/expect << eof
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# 设置捕获字符串后,期待回复的超时时间
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set timeout 30
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spawn ssh-copy-id -i /root/.ssh/id_rsa.pub $1@$2
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## 开始进连续捕获
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expect {
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"connecting (yes/no)?" { send "yes\n"; exp_continue }
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"s password:" { send "${ssh_passwd}\n"; exp_continue }
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}
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eof
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}
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for name in ${ssh_networkname[*]};do
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timeout 5 ssh root@${name} "echo ${name}: 'This is success!'"
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if [[ $? -ne 0 ]];then
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echo "复制文件到: ${name}"
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copy_ssh root ${name} > /dev/null
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fi
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done
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