hadoop配置自动化之一ssh自动化

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此篇博客参考：SSH无密码登录-多节点自动化部署SHELL篇。

测试环境：ubuntu12.04.2 server 64bit 、expect version 5.45、GNU bash, version 4.2.24(1)-release (x86_64-pc-linux-gnu)

说明：hadoop自动化配置出来的结果是：整个集群一个namenode、一个secondary、一个JobTracker，且这三个进程在同一个机器上面，datanode和tasktracker在其他slaves机器上面（如果有需要可以修改相应的shell script即可）

hadoop配置自动化怎么做？这个应该涉及到很多方面的内容。假如说这个集群全部是裸机，所有机器共用一个用户名和密码，配置了expect工具，默认在/etc/hosts里面配置了集群所有机器的机器名和ip。那么应该可以按照下面的思路来做：（1）ssh的自动化部署配置；（2）jdk的自动化部署配置；（3）hadoop的自动化配置；

（1）ssh的自动化部署配置的思路用户首先要在namenode节点上面配置一个slaves.host的文件，该文件包含所有集群slaves的机器名，然后运行脚本在namenode上面自动生成id_rsa.pub文件，并且产生authorized_keys授权文件，然后把该文件分发到slaves的集群上面完成ssh的配置；

（2）jdk的配置，jdk主要是把一个jdk.tar.gz包进行解压，然后配置.bashrc文件，然后把.bashrc文件和解压后的jdk.tar.gz文件分发到slaves集群；即可完成对jdk的配置；

（3）hadoop的自动化配置，这个配置要是配置conf文件夹下面的文件，首先下载hadoop的安装包，然后解压修改conf里面的一些常规配置，然后根据namenode节点上面的jdk路径和namenode机器名以及salves机器名配置相应的.xml、.env文件，最后把修改后的hadoop解压包分发到各个slaves即可；

这里首先贴上第一篇ssh的配置shell代码：

#!/bin/bash
# auto generate ssh key and distribute the authorized_keys to the salves machine
# the script should run on the namenode manchine

if [ $# -lt 2 ]; then
cat << HELP
 generate_ssh_v1 --generate ssh key for login without typing password;
this script should run on the namenode machine and user should edit the ip-list file

USAGE: ./generate_ssh_v1 user pasaword

EXAMPLE: ./generate_ssh_v1 hadoop1 1234
HELP
        exit 0
fi

user=$1
ip=$HOSTNAME
pass=$2
rm -rf ~/.ssh

echo ''
echo "####################################################"
echo " generate the rsa public key on $HOSTNAME ..."
echo "####################################################"

expect -c "
	set timeout 3
	spawn ssh $user@$ip
	expect \"yes/no\"
	send -- \"yes\r\" 
	expect \"password:\"
	send -- \"$pass\r\"
	expect \"$\"
	send \"ssh-keygen -t rsa -P '' -f $HOME/.ssh/id_rsa\r\"
	expect \"$\"
	send \"ssh-copy-id -i $HOME/.ssh/id_rsa.pub $HOSTNAME\r\"
	expect \"password\"
	send -- \"$pass\r\"
	expect eof
"
echo ''
echo "####################################################"
echo " copy the namenode's authorized_keys to slaves ..."
echo "####################################################"

for slave in `cat slaves.host`
do
	expect -c "
		set timeout 3
		spawn ssh $user@$slave
		expect \"yes/no\"
		send -- \"yes\r\"
		expect \"password\"
		send -- \"$pass\r\"
		expect \"$\"
		send \"rm -rf $HOME/.ssh\r\"
		expect \"$\"
		send \"mkdir $HOME/.ssh\r\"
		expect \"$\"
		expect eof
	"
done

for slave in `cat slaves.host`
do
	expect -c "
		set timeout 3
		spawn scp $HOME/.ssh/authorized_keys $user@$slave:$HOME/.ssh/
		expect \"password\"
		send -- \"$pass\r\"
		expect eof
	"
done

/etc/hosts :

192.168.128.138	hadoop
192.168.128.130	ubuntu

slaves.host:

hadoop

测试信息：

hadoop1@ubuntu:~$ ./generate_ssh_v1 hadoop1 1234

####################################################
 generate the rsa public key on ubuntu ...
####################################################
spawn ssh hadoop1@ubuntu
The authenticity of host 'ubuntu (192.168.128.130)' can't be established.
ECDSA key fingerprint is 53:c7:7a:dc:3b:bc:34:00:4a:6d:18:1c:5e:87:e7:e8.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ubuntu,192.168.128.130' (ECDSA) to the list of known hosts.
hadoop1@ubuntu's password: 
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.5.0-23-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

Last login: Mon Sep 23 15:22:03 2013 from ubuntu
ssh-keygen -t rsa -P '' -f /home/hadoop1/.ssh/id_rsa
hadoop1@ubuntu:~$ ssh-keygen -t rsa -P '' -f /home/hadoop1/.ssh/id_rsa
Generating public/private rsa key pair.
Your identification has been saved in /home/hadoop1/.ssh/id_rsa.
Your public key has been saved in /home/hadoop1/.ssh/id_rsa.pub.
The key fingerprint is:
e1:5e:20:9d:4e:11:f8:dc:05:35:08:83:5d:ce:99:ed hadoop1@ubuntu
The key's randomart image is:
+--[ RSA 2048]----+
|       +=+o+o    |
|      o..*.+..   |
|      .o*.=..    |
|       =oo..     |
|        S . E    |
|       . .       |
|        .        |
|                 |
|                 |
+-----------------+
hadoop1@ubuntu:~$ ssh-copy-id -i /home/hadoop1/.ssh/id_rsa.pub ubuntu
hadoop1@ubuntu's password: 
Now try logging into the machine, with "ssh 'ubuntu'", and check in:

  ~/.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

hadoop1@ubuntu:~$ 
####################################################
 copy the namenode's authorized_keys to slaves ...
####################################################
spawn ssh hadoop1@hadoop
The authenticity of host 'hadoop (192.168.128.138)' can't be established.
ECDSA key fingerprint is 10:8f:d1:8e:63:0a:af:1e:fb:d9:a8:bb:9a:39:ab:46.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'hadoop,192.168.128.138' (ECDSA) to the list of known hosts.
hadoop1@hadoop's password: 
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.5.0-23-generic i686)

 * Documentation:  https://help.ubuntu.com/

  System information as of Tue Aug  6 20:11:49 CST 2013

  System load:  0.1               Processes:           76
  Usage of /:   24.8% of 7.12GB   Users logged in:     2
  Memory usage: 34%               IP address for eth0: 192.168.128.138
  Swap usage:   0%

  Graph this data and manage this system at https://landscape.canonical.com/

85 packages can be updated.
45 updates are security updates.

Last login: Tue Aug  6 20:11:16 2013 from 192.168.128.130
hadoop1@hadoop:~$ rm -rf /home/hadoop1/.ssh
hadoop1@hadoop:~$ mkdir /home/hadoop1/.ssh
hadoop1@hadoop:~$ spawn scp /home/hadoop1/.ssh/authorized_keys hadoop1@hadoop:/home/hadoop1/.ssh/
hadoop1@hadoop's password: 
authorized_keys                                          100%  396     0.4KB/s   00:00    
hadoop1@ubuntu:~$ ssh ubuntu
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.5.0-23-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

Last login: Mon Sep 23 16:13:39 2013 from ubuntu
hadoop1@ubuntu:~$ exit
logout
Connection to ubuntu closed.
hadoop1@ubuntu:~$ ssh hadoop
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.5.0-23-generic i686)

 * Documentation:  https://help.ubuntu.com/

  System information as of Tue Aug  6 20:12:17 CST 2013

  System load:  0.12              Processes:           76
  Usage of /:   24.8% of 7.12GB   Users logged in:     2
  Memory usage: 34%               IP address for eth0: 192.168.128.138
  Swap usage:   0%

  Graph this data and manage this system at https://landscape.canonical.com/

85 packages can be updated.
45 updates are security updates.

Last login: Tue Aug  6 20:11:50 2013 from 192.168.128.130
hadoop1@hadoop:~$ exit
logout
Connection to hadoop closed.

总结：刚开始编写shell的时候连着写 spawn 然后直接敲shell的命令，结果老是expect后面的读不到。。。

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