zookeeper 在linux上安装 & 启动 ＆ 基本操作

一、安装java

sudo apt-get update
sudo apt-get install default-jre

二、安装zookeeper

　　下载

wget "http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz"

　　解压

tar -xf zookeeper-3.4.14.tar.gz 

　　创建配置文件

cd zookeeper-3.4.14/conf/
cp zoo_sample.cfg zoo.cfg

　　启动

cd zookeeper-3.4.14/bin/
./zkServer.sh start

三、伪集群模式

　　拷贝zookeeper

cp zookeeper-3.4.14 zookeeper-1 -r
cp zookeeper-3.4.14 zookeeper-2 -r
cp zookeeper-3.4.14 zookeeper-3 -r

　　修改配置：修改的为各自目录conf下的zoo.cfg，将dataDir、dataLogDir及clientPort修改为各自不同的，并增加ip列表。如zk1的配置：

# 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=/mnt/zookeeper-1/data
dataLogDir=/mnt/zookeeper-1/log
# the port at which the clients will connect
clientPort=12181
# 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

server.1=127.0.0.1:12888:13888
server.2=127.0.0.1:14888:15888
server.2=127.0.0.1:16888:17888

　　创建data、log目录与myid文件

mkdir -p  /mnt/zookeeper-1/data
mkdir -p  /mnt/zookeeper-2/data
mkdir -p  /mnt/zookeeper-3/data
mkdir -p  /mnt/zookeeper-1/log
mkdir -p  /mnt/zookeeper-2/log
mkdir -p  /mnt/zookeeper-3/log
echo 1 > /mnt/zookeeper-1/data/myid
echo 2 > /mnt/zookeeper-2/data/myid
echo 3 > /mnt/zookeeper-3/data/myid

　　分别启动三个zk

./zookeeper-1/bin/zkServer.sh start
./zookeeper-2/bin/zkServer.sh start
./zookeeper-3/bin/zkServer.sh start

　　查看状态

root@iZwz9hextk0ee6gik32377Z:~/zookeeper# for((idx=1;idx<=3;++idx)); do ./zookeeper-${idx}/bin/zkServer.sh start; done    
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-1/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-2/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-3/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
root@iZwz9hextk0ee6gik32377Z:~/zookeeper# for((idx=1;idx<=3;++idx)); do ./zookeeper-${idx}/bin/zkServer.sh status; done     
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-1/bin/../conf/zoo.cfg
Mode: follower
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-2/bin/../conf/zoo.cfg
Mode: leader
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/zookeeper-3/bin/../conf/zoo.cfg
Mode: follower

四、集群模式

　　与伪集群模式类似，区别是部署在不同机器。

五、基本操作

　　连接zk。执行bin目录下的zkCli.sh。由于部署时ip已不是默认ip 2181，需要指定ip port

./zkCli.sh -server 127.0.0.1:12181 

[zk: 127.0.0.1:12181(CONNECTED) 5] ls /    
[zookeeper]
[zk: 127.0.0.1:12181(CONNECTED) 6] create /test test
Created /test
[zk: 127.0.0.1:12181(CONNECTED) 7] ls / 
[zookeeper, test]
[zk: 127.0.0.1:12181(CONNECTED) 8] get /test
test
cZxid = 0x400000006
ctime = Mon Apr 06 22:01:48 CST 2020
mZxid = 0x400000006
mtime = Mon Apr 06 22:01:48 CST 2020
pZxid = 0x400000006
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
[zk: 127.0.0.1:12181(CONNECTED) 9] delete /test
[zk: 127.0.0.1:12181(CONNECTED) 10] ls /    
[zookeeper]
[zk: 127.0.0.1:12181(CONNECTED) 11] get /test
Node does not exist: /test
[zk: 127.0.0.1:12181(CONNECTED) 12] quit
Quitting...

 六、字段含义

cZxid
　　创建此znode的zxid

ctime
　　创建此znode的时间。
mZxid
　　最后修改此znode的zxid。
mtime
　　最后一次修改此znode的时间。

pZxid

　　最后一次修改子节点的zxid。

cversion
　　此znode的子节点的更改次数。（实际操作发现是创建/删除一级子节点）
dataVersion
　　此znode的数据更改的次数。
aclVersion
　　更改此znode的ACL的次数。
ephemeralOwner
　　如果znode是临时节点，则此znode所有者的会话id。如果它不是一个临时节点，则为零。
dataLength
　　此znode的数据字段的长度。
numChildren
　　这个znode的子节点的数目。

　　

参考链接：

　　http://zookeeper.apache.org/doc/r3.3.3/zookeeperProgrammers.html