在 CentOS7 上安裝 Zookeeper-3.4.10 服務

 一、建立 /usr/local/services/zookeeper 文件夾：
    mkdir -p /usr/local/services/zookeeper
 
二、進入到 /usr/local/services/zookeeper 目錄中：
    cd /usr/local/services/zookeeper
 
三、下載 zookeeper-3.4.10.tar.gz：
    wget http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.10/zookeeper-3.4.10.tar.gz
 
四、解壓縮 zookeeper-3.4.10.tar.gz：
    tar -zxvf zookeeper-3.4.10.tar.gz
 
五、進入到 /usr/local/services/zookeeper/zookeeper-3.4.9/conf 目錄中：
    cd zookeeper-3.4.10/conf/
 
六、複製 zoo_sample.cfg 文件的並命名爲爲 zoo.cfg：
    cp zoo_sample.cfg zoo.cfg
 
七、用 vim 打開 zoo.cfg 文件並修改其內容爲以下：
    # The number of milliseconds of each tick
 
    # zookeeper 定義的基準時間間隔，單位：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
 
    # 數據文件夾
    dataDir=/usr/local/services/zookeeper/zookeeper-3.4.10/data
 
    # 日誌文件夾
    dataLogDir=/usr/local/services/zookeeper/zookeeper-3.4.10/logs
 
    # the port at which the clients will connect
    # 客戶端訪問 zookeeper 的端口號
    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
 
八、保存並關閉 zoo.cfg 文件:
    
九、進入到 /usr/local/services/zookeeper/zookeeper-3.4.10/bin 目錄中：
    cd ../bin/
 
十、用 vim 打開 /etc/ 目錄下的配置文件 profile：
    vim /etc/profile
    並在其尾部追加以下內容：
 
    # 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
    export PATH
 
    # idea - zookeeper-3.4.10 config start - 2016-09-08
 
十一、使 /etc/ 目錄下的 profile 文件便可生效：
    source /etc/profile
 
十二、啓動 zookeeper 服務：
    zkServer.sh start
    如打印以下信息則代表啓動成功：
    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Starting zookeeper ... STARTED
 
1三、查詢 zookeeper 狀態：
    zkServer.sh status
 
1四、關閉 zookeeper 服務：
    zkServer.sh stop
    如打印以下信息則代表成功關閉：
    ZooKeeper JMX enabled by default
    Using config: /usr/local/services/zookeeper/zookeeper-3.4.10/bin/../conf/zoo.cfg
    Stopping zookeeper ... STOPPED
 
1五、重啓 zookeeper 服務：
    zkServer.sh restart
    如打印以下信息則代表重啓成功：
    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