[Dubbo日记]（1）Zookeeper安装

1. 下载地址

http://www.apache.org/dyn/closer.cgi/zookeeper/

2. 解压

tar zxvf  zookeeper-3.4.8.tar.gz

3. 重命名

在对应的zookeeper-3.4.8/conf 下有一个文件zoo_sample.cfg的这个文件里面配置了监听客户端连接的端口等一些信息，Zookeeper 在启动时会找zoo.cfg这个文件作为默认配置文件，所以我们重命名zoo_sample.cfg为zoo.cfg。使用如下命令：

mv zoo_sample.cfg zoo.cfg

4. 配置文件 zoo.cfg

# The number of milliseconds of each tick
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=/home/xiaosi/zookeeper/data
# the port at which the clients will connect
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

只需修改dataDir项即可，不要使用默认的/tmp目录；

如果需要集群，zoo.cfg的内容如下：(其中data目录和server地址需改成你真实部署机器的信息)：

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/xiaosi/zookeeper/data
clientPort=2181
server.1=10.20.153.10:2555:3555
server.2=10.20.153.11:2555:3555

并在data目录下放置myid文件：(上面zoo.cfg中的dataDir)

sudo mkdir data
sudo vim myid

myid指明自己的id，对应上面zoo.cfg中server.后的数字，第一台的内容为1，第二台的内容为2，myid内容如下：

1

5. 启动

进入bin目录 ./zkServer.sh start

xiaosi@Qunar:/opt/zookeeper-3.4.8/bin$ ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

查看zookeeper状态：

xiaosi@Qunar:/opt/zookeeper-3.4.8/bin$ ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: standalone

当zookeeper启动时，会在/home/xiaosi/zookeeper/data下生成一个zookeeper_server.pid文件。记录了zookeeper进程的进程ID号（本例中为13402）。

xiaosi   13402  6831  0 00:06 pts/20   00:00:00 /opt/jdk1.7.0_40/bin/java -Dzookeeper.log.dir=. -Dzookeeper.root.logger=INFO,CONSOLE -cp /opt/zookeeper-3.4.8/bin/../build/classes:/opt/zookeeper-3.4.8/bin/../build/lib/*.jar:/opt/zookeeper-3.4.8/bin/../lib/slf4j-log4j12-1.6.1.jar:/opt/zookeeper-3.4.8/bin/../lib/slf4j-api-1.6.1.jar:/opt/zookeeper-3.4.8/bin/../lib/netty-3.7.0.Final.jar:/opt/zookeeper-3.4.8/bin/../lib/log4j-1.2.16.jar:/opt/zookeeper-3.4.8/bin/../lib/jline-0.9.94.jar:/opt/zookeeper-3.4.8/bin/../zookeeper-3.4.8.jar:/opt/zookeeper-3.4.8/bin/../src/java/lib/*.jar:/opt/zookeeper-3.4.8/bin/../conf:.:/opt/jdk1.7.0_40/lib -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=false org.apache.zookeeper.server.quorum.QuorumPeerMain /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
xiaosi   13497 12559  0 00:07 pts/20   00:00:00 grep --color=auto zookeeper

6. 关闭

进入bin目录 ./zkServer.sh stop

xiaosi@Qunar:/opt/zookeeper-3.4.8/bin$ ./zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED