zookeeper集群

zookeeper集群

官方网站:

http://zookeeper.apache.org/

http://zookeeper.apache.org/doc/r3.4.8/zookeeperAdmin.html

环境:

CentOS 7.1

zookeeper-3.4.8

jdk-1.8

官方推荐奇数节点，这里以3节点为例

一.安装jdk

略

二.安装zookeeper

1.创建用户

useradd -r -m zookeeper

echo zookeeper:zoo.123|chpasswd

说明:服务启停都由zookeeper用户来操作

2.调整资源限制

cat >/etc/security/limits.d/99-zookeeper-nproc.conf <<HERE

zookeeper soft fsize unlimited 

zookeeper soft cpu unlimited 

zookeeper soft as unlimited 

zookeeper soft nofile 64000 

zookeeper soft nproc 64000 

zookeeper hard fsize unlimited 

zookeeper hard cpu unlimited 

zookeeper hard as unlimited 

zookeeper hard nofile 64000 

zookeeper hard nproc 64000 

HERE

3.安装zookeeper

wget http://apache.fayea.com/zookeeper/stable/zookeeper-3.4.8.tar.gz

tar -xvf zookeeper-3.4.8.tar.gz -C /opt/

mv /opt/zookeeper-3.4.8/ /opt/zookeeper

sed -i '/^ZOOBINDIR/c ZOOBINDIR=/opt/zookeeper/bin' /opt/zookeeper/bin/zkEnv.sh

4.配置环境变量

cat >/opt/zookeeper/conf/zookeeper-env.sh <<HERE

export JAVA_HOME=/opt/jdk

export ZOO_LOG_DIR=/opt/zookeeper/logs

export ZOOPIDFILE=/opt/zookeeper/run/zookeeper_server.pid

HERE

5.sysv init脚本

cp /opt/zookeeper/src/packages/rpm/init.d/zookeeper /etc/init.d/

sed -i '/zkEnv.sh/c source /opt/zookeeper/bin/zkEnv.sh' /etc/init.d/zookeeper

sed -i 's#zkServer.sh#/opt/zookeeper/bin/zkServer.sh#g' /etc/init.d/zookeeper

chmod +x /etc/init.d/zookeeper

chkconfig zookeeper on

chown -R zookeeper: /opt/zookeeper

setfacl -R -m zookeeper:rwx /opt/zookeeper

setfacl -R -m d:zookeeper:rwx /opt/zookeeper

三.集群配置

1.所有节点

cat >/opt/zookeeper/conf/zoo.cfg <<HERE

tickTime=2000

dataDir=/opt/zookeeper/data

clientPort=2181

initLimit=5

syncLimit=2

server.1=node-a.example.com:2888:3888

server.2=node-b.example.com:2888:3888

server.3=node-c.example.com:2888:3888

HERE

2.myid

node-a节点

mkdir -p /opt/zookeeper/data

echo 1 >/opt/zookeeper/data/myid

node-b节点

mkdir -p /opt/zookeeper/data

echo 2 >/opt/zookeeper/data/myid

node-c节点

mkdir -p /opt/zookeeper/data

echo 3 >/opt/zookeeper/data/myid

注意: 

目前myid的取值范围为1-255,节点的myid在单个集群内必须唯一

如果不指定myid，集群模式下会无法启动，只能以standalone模式运行

四.启动集群

service zookeeper start

或者

/opt/zookeeper/bin/zkServer.sh start

或者

cd /opt/zookeeper

java -cp zookeeper-3.4.8.jar:lib/slf4j-api-1.6.1.jar:lib/slf4j-log4j12-1.6.1.jar:lib/log4j-1.2.16.jar:conf org.apache.zookeeper.server.quorum.QuorumPeerMain conf/zoo.cfg

提示:如果启动报错，请检查日志及权限

[zookeeper@node-a ~]$ /opt/zookeeper/bin/zkServer.sh start

ZooKeeper JMX enabled by default

Using config: /opt/zookeeper/bin/../conf/zoo.cfg

Starting zookeeper ... STARTED

[zookeeper@node-a ~]$ /opt/jdk/bin/jps 

9607 QuorumPeerMain

9631 Jps

五.测试集群

1.telnet

ZooKeeper Commands: The Four Letter Words

telnet node-a.example.com 2181

2.cli_mt

cd /opt/zookeeper/src/c

./configure && make && make install

cli_mt node-a.example.com:2181