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在Ubuntu上搭建Zookeeper集群

摘要：
要安装Zookeeper集群，首先下载Zookeepher压缩包（可从官方网站下载）。这里是apache-zookeeper-3.58-bin.tar.gz。在每台主机上将其解压缩到/usr/local/zookepertar-zxvf/home/hadop/desktop/apache-zookeeper-3.58-bin.tar。gzsu//输入管理员mv/home/hadop/apachezookee

Zookeeper集群搭建

集群安装

先下载zookeeper压缩包（可从官网下载）

我这里是apache-zookeeper-3.5.8-bin.tar.gz

在各台主机上解压到/usr/local/zookeeper

tar -zxvf /home/hadoop/桌面/apache-zookeeper-3.5.8-bin.tar.gz
su    //进入管理员
mv /home/hadoop/apache-zookeeper-3.5.8-bin /usr/local/zookeeper
exit
修改配置文件
cd /usr/local/zookeeper/conf/
cp zoo_sample.cfg  zoo.cfg
vim zoo.cfg

打开后修改如下：（红色标记的是修改的地方）

# 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=/usr/local/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
#
# 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=master:2888:3888
server.2=slave1:2888:3888
server.3=slave2:2888:3888
server.4=slave3:2888:3888

改完后保存退出！

新建data文件夹

cd /usr/local/zookeeper/
mkdir data

分别设定在各主机使用一个命令表示id

这里直接在各个主机分别输入（echo "1" > /usr/local/zookeeper/data/myid    中的1是第一台主机，其余的主机往后递增）

echo "1" > /usr/local/zookeeper/data/myid

测试：

1.启动ZooKeeper

在各个主机都输入：

cd /usr/local/zookeeper/bin/
./zkServer.sh start

显示如下

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

2查看状态

在各个主机都输入：

./zkServer.sh status

观察各个主机的Mode显示有一台主机是leader和多台主机是follower就是成功了

检测是否成功启动，在客户端连接下服务端

./zkCli.sh -server slave1:2181

显示如下：

Connecting to slave1:2181
2020-10-17 01:51:39,229 [myid:] - INFO  [main:Environment@109] - Client environment:zookeeper.version=3.5.8-f439ca583e70862c3068a1f2a7d4d068eec33315, built on 05/04/2020 15:07 GMT
2020-10-17 01:51:39,233 [myid:] - INFO  [main:Environment@109] - Client environment:host.name=master
2020-10-17 01:51:39,233 [myid:] - INFO  [main:Environment@109] - Client environment:java.version=1.8.0_265
2020-10-17 01:51:39,236 [myid:] - INFO  [main:Environment@109] - Client environment:java.vendor=Private Build
2020-10-17 01:51:39,236 [myid:] - INFO  [main:Environment@109] - Client environment:java.home=/usr/lib/jvm/java-8-openjdk-amd64/jre
2020-10-17 01:51:39,236 [myid:] - INFO  [main:Environment@109] - Client environment:java.class.path=/usr/local/zookeeper/bin/../zookeeper-server/target/classes:/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../zookeeper-server/target/lib/*.jar:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/zookeeper-jute-3.5.8.jar:/usr/local/zookeeper/bin/../lib/zookeeper-3.5.8.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.7.25.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.7.25.jar:/usr/local/zookeeper/bin/../lib/netty-transport-native-unix-common-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-transport-native-epoll-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-transport-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-resolver-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-handler-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-common-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-codec-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/netty-buffer-4.1.48.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.17.jar:/usr/local/zookeeper/bin/../lib/json-simple-1.1.1.jar:/usr/local/zookeeper/bin/../lib/jline-2.11.jar:/usr/local/zookeeper/bin/../lib/jetty-util-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/jetty-servlet-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/jetty-server-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/jetty-security-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/jetty-io-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/jetty-http-9.4.24.v20191120.jar:/usr/local/zookeeper/bin/../lib/javax.servlet-api-3.1.0.jar:/usr/local/zookeeper/bin/../lib/jackson-databind-2.10.3.jar:/usr/local/zookeeper/bin/../lib/jackson-core-2.10.3.jar:/usr/local/zookeeper/bin/../lib/jackson-annotations-2.10.3.jar:/usr/local/zookeeper/bin/../lib/commons-cli-1.2.jar:/usr/local/zookeeper/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/bin/../zookeeper-*.jar:/usr/local/zookeeper/bin/../zookeeper-server/src/main/resources/lib/*.jar:/usr/local/zookeeper/bin/../conf:.:/usr/share/java/jdk1.8.0_261/lib:/lib
2020-10-17 01:51:39,236 [myid:] - INFO  [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:java.io.tmpdir=/tmp
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:java.compiler=<NA>
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:os.name=Linux
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:os.arch=amd64
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:os.version=4.15.0-120-generic
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:user.name=hadoop
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:user.home=/home/hadoop
2020-10-17 01:51:39,237 [myid:] - INFO  [main:Environment@109] - Client environment:user.dir=/usr/local/zookeeper/bin
2020-10-17 01:51:39,238 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.free=25MB
2020-10-17 01:51:39,239 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.max=228MB
2020-10-17 01:51:39,239 [myid:] - INFO  [main:Environment@109] - Client environment:os.memory.total=31MB
2020-10-17 01:51:39,242 [myid:] - INFO  [main:ZooKeeper@868] - Initiating client connection, connectString=slave1:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@726f3b58
2020-10-17 01:51:39,249 [myid:] - INFO  [main:X509Util@79] - Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
2020-10-17 01:51:39,259 [myid:] - INFO  [main:ClientCnxnSocket@237] - jute.maxbuffer value is 4194304 Bytes
2020-10-17 01:51:39,268 [myid:] - INFO  [main:ClientCnxn@1653] - zookeeper.request.timeout value is 0. feature enabled=
Welcome to ZooKeeper!
2020-10-17 01:51:39,386 [myid:slave1:2181] - INFO  [main-SendThread(slave1:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server slave1/192.168.58.129:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2020-10-17 01:51:39,570 [myid:slave1:2181] - INFO  [main-SendThread(slave1:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /192.168.58.128:48134, server: slave1/192.168.58.129:2181
2020-10-17 01:51:39,748 [myid:slave1:2181] - INFO  [main-SendThread(slave1:2181):ClientCnxn$SendThread@1394] - Session establishment complete on server slave1/192.168.58.129:2181, sessionid = 0x200005f99630000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: slave1:2181(CONNECTED) 0]

现在就可以通过客户端执行基本命令 ls /

[zk: slave2:2181(CONNECTED) 0] create /test 111
Created /test
[zk: slave2:2181(CONNECTED) 1] ls /
[test, zookeeper]
[zk: slave2:2181(CONNECTED) 2] get /test
111

验证数据是否同步

[zk: slave1:2181(CONNECTED) 0] get /test
111
[zk: slave1:2181(CONNECTED) 1]

通过验证可以看出 在服务slave2上创建的节点，在slave1上也可以获取到，说明集群部署是OK的.

配置环境变量（进入管理员）（在每台主机上执行相同的操作）

su
vim /etc/profile

在最后添加：

export ZOOKEEPER_HOME=/usr/local/zookeeper
export PATH=$PATH:$ZOOKEEPER_HOME/bin

保存退出（:wq!）

使之生效

source /etc/profile

如果想查看zookeeper的版本

cd /usr/local/zookeeper/conf下，用vim打开zoo.cfg，在最后添加:

4lw.commands.whitelist=*

回到bin目录重启zookeeper

cd /usr/local/zookeeper/bin/
./zkServer.sh restart   //重启服务端
./zkCli.sh     //启动客户端

就可以通过以下命令查看zookeeper的版本信息了

echo stat|nc localhost 2181

信息如下：

ookeeper version: 3.5.8-f439ca583e70862c3068a1f2a7d4d068eec33315, built on 05/04/2020 15:07 GMT
Clients:
 /127.0.0.1:42040[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000007
Mode: follower
Node count: 6

写的不好还请多指教。

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