zookeeper集群搭建步骤及解决启动失败问题

安装解压zookeeper后进入解压后的文件

[root@xuniji zookeeper-3.4.5]# cd conf/

[root@xuniji conf]# ll
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-rw-r--r--. 1 houyiqia games  535 10鏈 1 2012 configuration.xsl
-rw-r--r--. 1 houyiqia games 2161 10鏈 1 2012 log4j.properties
-rw-r--r--. 1 root     root   808 1鏈 10 2018 zoo.cfg
-rw-r--r--. 1 houyiqia games  808 10鏈 1 2012 zoo_sample.cfg

[root@xuniji conf]# vi 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=/root/zkdata  （修改为自己创建的目录，下面会用到这个目录，这也是可能造成启动失败、容易忽视的地方）
# the port at which the clients will connect
clientPort=2181
#
# 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=xuniji:2888:3888   
server.2=linux2:2888:3888
server.3=linux3:2888:3888

(添加这三行  之后设置myid必须与server后的数字一致，也是zookeeper启动失败原因之一，可查看zookeeper.out日志看是什么原因造成)

保存退出

[root@xuniji conf]# mkdir /root/zkdata  （创建上面修改的目录）

[root@xuniji ~]# cd /root/zkdata
[root@xuniji zkdata]# ll
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[root@xuniji zkdata]# echo 1 > myid
[root@xuniji zkdata]# ll
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-rw-r--r--. 1 root root 2 7鏈 11 19:15 myid
[root@xuniji zkdata]# cat myid

1

将本机安装zookeeper的目录复制到其他主机

[root@xuniji ~]# scp -r apps/ 192.168.1.118:/root

The authenticity of host '192.168.1.118 (192.168.1.118)' can't be established.
RSA key fingerprint is 0f:3d:4b:70:62:96:26:2c:85:91:49:e5:34:2b:3e:3d.

Are you sure you want to continue connecting (yes/no)? yes

在目标主机上创建目录

[root@linux3 ~]# mkdir zkdata
[root@linux3 ~]# echo 3 > zkdata/myid

[root@linux3 ~]# 

启动

必须先关闭防火墙 service iptable stop

[root@linux2 zookeeper-3.4.5]# bin/zkServer.sh start
JMX enabled by default
Using config: /root/apps/zookeeper-3.4.5/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@linux2 zookeeper-3.4.5]# bin/zkServer.sh status
JMX enabled by default
Using config: /root/apps/zookeeper-3.4.5/bin/../conf/zoo.cfg

Mode: leader

解决启动失败问题

查看端口是否被占用

我的端口是2181（查看端口：进入zookeeper的conf目录）

[root@xuniji conf]# vi 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=/root/zkdata
# the port at which the clients will connect
clientPort=2181  （端口）
#
# 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=192.168.100.130:2888:3888
server.2=192.168.100.129:2888:3888
server.3=192.168.100.131:2888:3888

[root@xuniji zookeeper-3.4.5]# netstat -apn | grep 2181    （查看端口是否被占用）
tcp        0      0 :::2181                     :::*                        LISTEN      4212/java    （端口被4212占用）       
[root@xuniji zookeeper-3.4.5]# kill -9 4212（杀掉被占用的端口）
[root@xuniji zookeeper-3.4.5]# netstat -apn | grep 2181 

[root@xuniji zookeeper-3.4.5]# 

zookeeper就可以正常启动了，若还不行往下看（这里也是我启动不成功的原因）
[root@linux3 zookeeper-3.4.5]# cd /root/zkdata（进入上面说的创建的目录下）
[root@linux3 zkdata]# ll
总用量 12
-rw-r--r--. 1 root root    2 7月  11 20:03 myid
drwxr-xr-x. 2 root root 4096 7月  11 22:00 version-2
-rw-r--r--. 1 root root    4 7月  11 21:59 zookeeper_server.pid
[root@linux3 zkdata]# rm -rf version-2/ zookeeper_server.pid（除了myid其他全部删掉）
[root@linux3 zkdata]# ll
总用量 4
-rw-r--r--. 1 root root 2 7月  11 20:03 myid

[root@linux3 zookeeper-3.4.5]# bin/zkServer.sh start
JMX enabled by default
Using config: /root/apps/zookeeper-3.4.5/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@linux3 zookeeper-3.4.5]# bin/zkServer.sh status
JMX enabled by default
Using config: /root/apps/zookeeper-3.4.5/bin/../conf/zoo.cfg
Mode: follower
[root@linux3 zookeeper-3.4.5]# 

这样就可以启动成功了用了一个下午终于解决了启动失败问题