集群管理下的批量免密

实现背景

运维开发管理人员，当项目开始进行集群管理，传统的场景下，批量申请机器，但是一些操作虽然可以借助第三方的批量执行任务完成设置免密的工作，但是对于k8s部署，Spark集群的部署等等需要集群概念的架构体系中，我们往往需要快速地进行集群批量的自动化免密设置，对于新手往往需要学习成本，所以本文通过批量免密设置实现快速的批量设置。

项目设计

1 创建执行目录

mkdir /tmp/ClusterSsh
cd /tmp/ClusterSsh

2 执行参数配置

vi host

xx.xx.xx.xx
xx.xx.xx.xx

3 查看执行脚本

#!/bin/sh
DEST_USER=$1
PASSWORD=$2
HOSTS_FILE=$3
if [ $# -ne 3 ]; then
    echo "Usage:"
    echo "$0 remoteUser remotePassword hostsFile"
    exit 1
fi

SSH_DIR=~/.ssh
SCRIPT_PREFIX=./tmp
echo ===========================

# 1. prepare  directory .ssh
mkdir $SSH_DIR
chmod 700 $SSH_DIR

# 2. generat ssh key
TMP_SCRIPT=$SCRIPT_PREFIX.sh
echo  "#!/usr/bin/expect">$TMP_SCRIPT
echo  "spawn ssh-keygen -b 1024 -t rsa">>$TMP_SCRIPT
echo  "expect *key*">>$TMP_SCRIPT
echo  "send \r">>$TMP_SCRIPT
if [ -f $SSH_DIR/id_rsa ]; then
    echo  "expect *verwrite*">>$TMP_SCRIPT
    echo  "send y\r">>$TMP_SCRIPT
fi
echo  "expect *passphrase*">>$TMP_SCRIPT
echo  "send \r">>$TMP_SCRIPT
echo  "expect *again:">>$TMP_SCRIPT
echo  "send \r">>$TMP_SCRIPT
echo  "interact">>$TMP_SCRIPT

chmod +x $TMP_SCRIPT

/usr/bin/expect $TMP_SCRIPT
rm $TMP_SCRIPT

# 3. generat file authorized_keys
cat $SSH_DIR/id_rsa.pub>>$SSH_DIR/authorized_keys

# 4. chmod 600 for file authorized_keys
chmod 600 $SSH_DIR/authorized_keys
echo ===========================

# 5. copy all files to other hosts
for ip in $(cat $HOSTS_FILE)
do
    if [ "x$ip" != "x" ]; then
        echo -------------------------
        TMP_SCRIPT=${SCRIPT_PREFIX}.$ip.sh
        # check known_hosts
        val=`ssh-keygen -F $ip`
        if [ "x$val" == "x" ]; then
            echo "$ip not in $SSH_DIR/known_hosts, need to add"
            val=`ssh-keyscan $ip 2>/dev/null`
            if [ "x$val" == "x" ]; then
                echo "ssh-keyscan $ip failed!"
            else
                echo $val>>$SSH_DIR/known_hosts
            fi
        fi
        echo "copy $SSH_DIR to $ip"

        echo  "#!/usr/bin/expect">$TMP_SCRIPT
        echo  "spawn scp -r  $SSH_DIR $DEST_USER@$ip:~/">>$TMP_SCRIPT
        echo  "expect *assword*">>$TMP_SCRIPT
        echo  "send $PASSWORD\r">>$TMP_SCRIPT
        echo  "interact">>$TMP_SCRIPT

        chmod +x $TMP_SCRIPT
        #echo "/usr/bin/expect $TMP_SCRIPT" >$TMP_SCRIPT.do
        #sh $TMP_SCRIPT.do&

        /usr/bin/expect $TMP_SCRIPT
        rm $TMP_SCRIPT
        echo "copy done."
    fi
done

echo done.

sh ssh_auth.sh root $(paasswd) host

4 依赖自行安装检查

需要提前安装expect进行设置的，因为不同操作系统配置方式并不相同，所以自行设置实现：

yum install expect -y

免密登录检查:

ssh root@xx.xx.xx.xx

说明:可以部署密码就可以登录就可以证明绵密设置成功！

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