大数据集群 多命令脚本

1 简介

在大数据集群部署过程中，需要查询各个集群节点运行的服务状态，可使用批量命令脚本。

2 配置集群hostname

2.1 配置hostname文件

1 服务器hadoop01

[root@localhost ~]# echo hostname1 > /etc/hostname
hostname hadoop01

2 服务器hadoop02

[root@localhost ~]# echo hadoop02 > /etc/hostname
hostname hadoop02

3 服务器hadoop03

[root@localhost ~]# echo hadoop03 > /etc/hostname
hostname hadoop03

4 服务器hadoop04

[root@localhost ~]# echo hadoop04 > /etc/hostname
hostname hadoop04

2.2 配置hosts文件

同步脚本的那台机器上，现在是hadoop01

192.168.85.101 hadoop01
192.168.85.102 hadoop02
192.168.85.103 hadoop03
192.168.85.104 hadoop04
192.168.85.105 hadoop05

3 配置免密登录

3.1 生成rsa密钥

使用命令ssh-keygen 生成rsa密钥，配置信息直接回车即可, 生成的密钥默认在当前用户主目录的.ssh目录下。
密钥文件有两个：

• id_rsa 存放着私钥
• id_rsa.pub 存放着公钥

[root@localhost ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:fX0pdntsAyRWTvjuoSG+VFu/vsfFpRypBi2Z5iRY8ok root@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
|            .o   |
|      . .  .+    |
|       * . *.o . |
|      E +.O +oo o|
|        S=.+oB.*o|
|         .oo*oBo+|
|        ...o+ .==|
|        .. . . .*|
|         ..   .+o|
+----[SHA256]-----+
[root@localhost ~]# 

3.2 同步公钥到其他服务器

3.2.1 安装rsync

[root@localhost ~]# yum install -y rsync

3.2.1 同步公钥

[root@localhost ~]#  cp id_rsa.pub authorized_keys

[root@localhost ~]# rsync authorized_keys root@hadoop02:/root/.ssh/

[root@localhost ~]# rsync authorized_keys root@hadoop03:/root/.ssh/

[root@localhost ~]# rsync authorized_keys root@hadoop04:/root/.ssh/

3.3 免密登录测试

无需输入密码，代表密码登录配置成功

[root@localhost ~]# root@hadoop02

4 脚本使用

用户主目录的bin目录添加 pwd查看当前目录，用户登录进去的初始目录，一般为家目录

4.1 创建脚本

#!/bin/bash
for i in  auskat@hadoop102 auskat@hadoop103 auskat@hadoop104
do
    echo "================  $i  ================="
    ssh $i '/opt/module/jdk1.8.0_144/bin/jps'
done

4.2 测试脚本

[root@localhost ~]# batchJps
================  auskat@hadoop102  =================
1492 Jps
================  auskat@hadoop103  =================
1492 Jps
================  auskat@hadoop104  =================
1492 Jps