shell一键免密互信

#!/bin/bash
installpath=$(cd `dirname $0`; pwd)
echo "安装路径: ${installpath}"
#myip=`ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1 -d '/'`
#echo "当前主机IP: ${myip}"
filepath=${installpath}/files
echo "由于当前环境还未做免密 所以需要安装远程带密码的工具 sshpass"
rpm -ivh ${filepath}/sshpass*.rpm
echo "首先在三台机器先生成 ssh密钥"
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa >/dev/null 2>&1
for i in {1..2}
do
    sshpass -p $4 ssh -o 'StrictHostKeyChecking=no' -Tq root@cdh-worker$i <<remotessh
        ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa >/dev/null 2>&1
        mkdir -p ${filepath}
    exit
remotessh
done
for i in {1..2}
do
        echo "copy master节点公钥到cdh-worker$i节点"
        echo "sshpass -p $4 ssh-copy-id -i ~/.ssh/id_dsa.pub root@cdh-worker$i"
        sshpass -p $4 ssh-copy-id -o 'StrictHostKeyChecking=no' -i ~/.ssh/id_dsa.pub root@cdh-master
        sshpass -p $4 ssh-copy-id -o 'StrictHostKeyChecking=no' -i ~/.ssh/id_dsa.pub root@cdh-worker$i
        echo "发送sshpass安装包到cdh-worker$i节点"
        scp ${filepath}/sshpass*.rpm root@cdh-worker$i:${filepath}
        echo "copy worker$i节点公钥到主节点和其他从节点"
        sshpass -p $4 ssh -o 'StrictHostKeyChecking=no' -Tq root@cdh-worker$i <<remotessh
            rpm -ivh ${filepath}/sshpass*.rpm
            echo "sshpass -p $4 ssh-copy-id -i ~/.ssh/id_dsa.pub root@cdh-master"
            sshpass -p $4 ssh-copy-id -o 'StrictHostKeyChecking=no' -i ~/.ssh/id_dsa.pub root@cdh-master
            sshpass -p $4 ssh-copy-id -o 'StrictHostKeyChecking=no' -i ~/.ssh/id_dsa.pub root@cdh-worker1
            sshpass -p $4 ssh-copy-id -o 'StrictHostKeyChecking=no' -i ~/.ssh/id_dsa.pub root@cdh-worker2
        exit
remotessh
done