RHEL自动安装Zookeeper的shell脚本

A：本脚本运行的机器，Linux RHEL6

B,C,D,...：待安装zookeeper cluster的机器, Linux RHEL6

首先在脚本运行的机器A上确定可以ssh无密码登录到待安装zk的机器B,C,D,...上，然后就可以在A上运行本脚本:

$ ./install_zookeeper

前提：

B, C, D机器必须配置好repo，本脚本使用的是cdh5的repo, 下面的内容保存到：/etc/yum.repos.d/cloudera-cdh5.repo:

[cloudera-cdh5]
# Packages for Cloudera's Distribution for Hadoop, Version 5, on RedHat or CentOS 6 x86_64
name=Cloudera's Distribution for Hadoop, Version 5
baseurl=http://archive.cloudera.com/cdh5/redhat/6/x86_64/cdh/5/
gpgkey = http://archive.cloudera.com/cdh5/redhat/6/x86_64/cdh/RPM-GPG-KEY-cloudera   
gpgcheck = 1
enabled  = 1

自动安装脚本将自动在B,C,D机器上安装好zookeeper, 配置好相关配置文件。但没有启动它们。支持1,3,5,7个服务器。

#!/bin/bash
#
# @file
#  install_zookeeper.sh
#
# @date
#  2014-12-21
#
# @author
#  [email protected]
#
# @version
#  0.0.1pre
#
# @usage
#  ./install_zookeeper.sh
################################################################################

#***********************************************************
# split_to_array
#  split string into array
#***********************************************************
function split_to_array() {
    OLD_IFS="$IFS"
    IFS="$2"
    array=($1)
    IFS="$OLD_IFS"
}

#***********************************************************
# install_zookeeper
#  install zookeeper on 1, 3 or 5 servers
#
# Parameters:
#  clientPort - the port at which the clients will connect to
#  servers - varying arguments: 1, 3, 5, up to 7
#    "zkServer:serverPort:appPort"
#    zkServer - ipaddr of zookeeper server
#    serverPort - communication port for zookeeper servers
#    appPort - communication port between zookeeper with other applications
#
# Example:
#  1) install_zookeeper 2181 zk1 zk2 zk3
#  2) install_zookeeper 2181 192.168.122.201 192.168.122.202 192.168.122.203
#  3) install_zookeeper "2181" "192.168.122.201:2888:3888" "192.168.122.202:2888:3888" "192.168.122.203:2888:3888"
#  4) install_zookeeper "2181:/var/lib/zookeeper" "192.168.122.201:2888:3888" "192.168.122.202:2888:3888" "192.168.122.203:2888:3888"
#***********************************************************
ERR_INVALID_ZK_SERVERS=1001

function install_zookeeper() {
    echo -e "<INFO> install zookeeper on cluster ..."
    #chk_root

    local ret clientPort dataDir len i ZOO_CFG server serverPort appPort destip destlogin

    serverPort=2888
    appPort=3888

    # parse the first argument
    split_to_array $1 ":"

    # the port at which the clients will connect
    clientPort=${array[0]}

    # the directory where the snapshot is stored
    dataDir="/var/lib/zookeeper"
    if [ ${#array[*]} -eq 2 ]; then
        dataDir=${array[1]}
    fi

    echo -e "<INFO> clientPort: $clientPort"
    echo -e "<INFO> dataDir: $dataDir"

    # zookeeper configure file
    ZOO_CFG="/usr/lib/zookeeper/conf/zoo.cfg"

    # get list of servers: args
    shift
    local argc=$#

    if [ $argc -eq 1 -o $argc -eq 3 -o $argc -eq 5 -o $argc -eq 7 ]; then
        echo -e "<INFO> zookeeper servers in cluster: [$argc]"
    else
        echo -e "<ERROR> invalid zookeeper servers: [$argc]"
        exit $ERR_INVALID_ZK_SERVERS;
    fi

    local argv="$@"

    OLD_IFS="$IFS"
    IFS=" "
    local args=($argv)
    IFS="$OLD_IFS"

    # array variable
    local ipaddrs=()
    local servers=()

    local sid=0
    for a in ${args[@]}
    do
        let sid++

        # check if server format is either of:
        #  serverIP
        # or:
        #  serverIP:serverPort:appPort
        split_to_array $a ":"
        serverIP=${array[0]}

        if [ ${#array[*]} -ne 3 ]; then
            a="$serverIP:$serverPort:$appPort";
        fi

        local server="server.$sid=$a"
        servers[sid-1]=$server
        echo $server

        ipaddrs[sid-1]=$serverIP
    done

    # output array to one line string: echo ${servers[@]}
    # get length of array
    len=${#servers[*]}
    i=0
    while [ $i -lt $len ]
    do
        let sid=i+1
        destip=${ipaddrs[$i]}
        destlogin=root@$destip
        echo -e "<INFO> configuring server.$sid: $destip ...\c"

        ret=`ssh $destlogin "yum install -y zookeeper zookeeper-server && service zookeeper-server init --myid=$sid"`

        ret=`ssh $destlogin "echo '#!{{[email protected]==>' >> $ZOO_CFG"`

        for s in ${servers[*]}
        do
            ret=`ssh $destlogin "echo '$s' >> $ZOO_CFG"`
        done

        ret=`ssh $destlogin "echo '#!<[email protected]}}' >> $ZOO_CFG"`

        echo -e "OK."

        let i++
    done

    echo "<INFO> zookeeper cluster installation completed successfully!"
}

#=======================================================================
install_zookeeper "2181" "192.168.122.201" "192.168.122.202" "192.168.122.203"

根据配置修改最后一行:

install_zookeeper "2181" "192.168.122.201" "192.168.122.202" "192.168.122.203"

注意：需要把zk-cluster的每台机器上的防火墙停掉，再启动zookeeper:

$ /usr/lib/zookeeper/bin/zkServer.sh start-foreground

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