在 CentOS7 上安装 zookeeper-3.4.10 服务

ZooKeeper服务器是用Java编写创建，它运行在JVM。所以需要使用JDK 6或更高版本。

1、创建 /usr/local/services/zookeeper 文件夹：

mkdir -p /usr/local/services/zookeeper

2、进入到 /usr/local/services/zookeeper 目录中：

cd /usr/local/services/zookeeper

3、下载 zookeeper-3.4.10.tar.gz：

wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.10/zookeeper-3.4.10.tar.gz

4、解压缩 zookeeper-3.4.10.tar.gz：

tar -zxvf zookeeper-3.4.10.tar.gz

5、进入到 /usr/local/services/zookeeper/zookeeper-3.4.10/conf 目录中：

cd zookeeper-3.4.10/conf/

6、复制 zoo_sample.cfg 文件的并命名为为 zoo.cfg：

cp zoo_sample.cfg zoo.cfg

7、用 vim 打开 zoo.cfg 文件并修改其内容为如下：

    # The number of milliseconds of each tick

    # zookeeper 定义的基准时间间隔，单位：毫秒
    tickTime=2000

    # The number of ticks that the initial
    # synchronization phase can take
    initLimit=10
    # The number of ticks that can pass between
    # sending a request and getting an acknowledgement
    syncLimit=5
    # the directory where the snapshot is stored.
    # do not use /tmp for storage, /tmp here is just
    # example sakes.
    # dataDir=/tmp/zookeeper

    # 数据文件夹
    dataDir=/usr/local/services/zookeeper/zookeeper-3.4.10/data

    # 日志文件夹
    dataLogDir=/usr/local/services/zookeeper/zookeeper-3.4.10/logs

    # the port at which the clients will connect
    # 客户端访问 zookeeper 的端口号
    clientPort=2181

    # the maximum number of client connections.
    # increase this if you need to handle more clients
    #maxClientCnxns=60
    #
    # Be sure to read the maintenance section of the
    # administrator guide before turning on autopurge.
    #
    # http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
    #
    # The number of snapshots to retain in dataDir
    #autopurge.snapRetainCount=3
    # Purge task interval in hours
    # Set to "0" to disable auto purge feature
    #autopurge.purgeInterval=1

8、保存并关闭 zoo.cfg 文件:

9、进入到 /usr/local/services/zookeeper/zookeeper-3.4.10/bin 目录中：

cd ../bin/

10、用 vim 打开 /etc/ 目录下的配置文件 profile：

vim /etc/profile

并在其尾部追加如下内容：

    # idea - zookeeper-3.4.10 config start - 2016-09-08
    export ZOOKEEPER_HOME=/usr/local/services/zookeeper/zookeeper-3.4.10/
    export PATH=$ZOOKEEPER_HOME/bin:$PATH
    # idea - zookeeper-3.4.10 config start - 2016-09-08

11、使 /etc/ 目录下的 profile 文件即可生效：

source /etc/profile

12、启动 zookeeper 服务：

zkServer.sh start

    如打印如下信息则表明启动成功：

    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Starting zookeeper ... STARTED

13、查询 zookeeper 状态：

zkServer.sh status

14、关闭 zookeeper 服务：

zkServer.sh stop

如打印如下信息则表明成功关闭：

    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Stopping zookeeper ... STOPPED

15、重启 zookeeper 服务：

zkServer.sh restart

如打印如下信息则表明重启成功：
    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Stopping zookeeper ... STOPPED
    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Starting zookeeper ... STARTED