Linux下zookeeper集群搭建
部署前准备
下载zookeeper的安装包
http://zookeeper.apache.org/releases.html 我下载的版本是zookeeper-3.4.10。-
准备三台服务器
ip地址为:172.16.18.198 172.16.18.199 172.16.18.200
检查jdk版本,安装jdk环境,jdk需要1.7以上。
安装zookeeper
三台服务器分别上传zookeeper安装包,上传到/opt/目录下,然后tar zxvf zookeeper-3.4.10.tar.gz
拷贝zoo_sample.cfg 为zoo.cfg 修改/opt/zookeeper-3.4.10/conf/zoo.cfg配置文件,添加如下内容:
server.1=172.16.18.198:2888:3888
server.2=172.16.18.199:2888:3888
server.3=172.16.18.200:2888:3888
- 修改zookeeper数据文件存放目录
dataDir=/data/zookeeper
此时zoo.cfg 配置文件内容为:
# The number of milliseconds of each tick
tickTime=2000 ##zookeeper单位时间为2ms
# The number of ticks that the initial
# synchronization phase can take
initLimit=10 ##对于从节点最初连接到主节点时的超时时间,单位为tick值的倍数。即20ms
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5 ##对于主节点与从节点进行同步操作时的超时时间,单位为tick值的倍数。即10ms
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/data/zookeeper
# the port at which the clients will connect
clientPort=2181 ##客户端链接端口
# the maximum number of client connections.
# increase this if you need to handle more clients
maxClientCnxns=60 ##客户端最大链接数
#
# 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=172.16.18.198:2888:3888
server.2=172.16.18.199:2888:3888
server.3=172.16.18.200:2888:3888
- 新建myid文件
在三台服务器的数据存放目录下新建myid文件,并写入对应的server.num 中的num数字
如:在172.16.18.198上将server.1中1写入myid
echo 1 >/data/zookeeper/myid
- 添加环境变量,方便我们执行脚本命令
vi etc/profile 在最后添加如下两个。
export ZOOKEEPER_HOME=/opt/zookeeper-3.4.9
export PATH=$PATH:$ZOOKEEPER_HOME/bin:$ZOOKEEPER_HOME/conf
保存后重新加载一下:
source /etc/profile
- 修改日志存放目录(可选)
vi /opt/zookeeper/bin/zkEnv.sh 找到ZOO_LOG_DIR 和 ZOO_LOG4J_PROP位置
if [ "x${ZOO_LOG_DIR}" = "x" ]
then
#配置zookeeper日志输出存放路径
ZOO_LOG_DIR="/var/applog/zookeeper"
fi
if [ "x${ZOO_LOG4J_PROP}" = "x" ]
then
#配置日志输出级别,这里把几个级别一并配上
ZOO_LOG4J_PROP="INFO,CONSOLE,ROLLINGFILE,TRACEFILE"
fi
编辑conf目录下log4j.properties
# Define some default values that can be overridden by system properties
zookeeper.root.logger=INFO, CONSOLE, ROLLINGFILE, TRACEFILE
zookeeper.console.threshold=INFO
zookeeper.log.dir=.
zookeeper.log.file=zookeeper.log
zookeeper.log.threshold=ERROR
zookeeper.tracelog.dir=.
zookeeper.tracelog.file=zookeeper_trace.log
log4j.rootLogger=${zookeeper.root.logger}
完成log的日志目录的修改。
- 启动zookeeper服务
zkServer.sh start来启动。
zkServer.sh restart (重启)
zkServer.sh status (查看状态)
zkServer.sh stop (关闭)
zkServer.sh start-foreground (以打印日志方式启动)
三台服务器分别执行:
zkServer.sh start
然后用 status 检查下状态 如果出现 Mode:leader 或者Mode:follower 表示搭建成功。否则前台执行看一下日志。
$ zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower
如出现:
2019-04-29 14:04:05,992 [myid:3] - INFO [ListenerThread:QuorumCnxManager$Listener@739] - My election bind port: /172.16.18.200:3888
2019-04-29 14:04:06,019 [myid:3] - INFO [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:QuorumPeer@865] - LOOKING
2019-04-29 14:04:06,025 [myid:3] - INFO [QuorumPeer[myid=3]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@818] - New election. My id = 3, proposed zxid=0x0
2019-04-29 14:04:06,056 [myid:3] - WARN [WorkerSender[myid=3]:QuorumCnxManager@588] - Cannot open channel to 1 at election address /172.16.18.198:3888
java.net.NoRouteToHostException: 没有到主机的路由
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
"zookeeper.log" 303L, 35429C
报这种异常一般有三种情况:
1):zoo.cfg配置文件中,server.x:2888:3888配置出现错误;
2):myid文件内容和server.x不对应,或者myid不在data目录下;
3):系统防火墙是否在启动。
我检查了三种原因后发现是防火墙running。
centos7下查看防火墙状态的命令:
firewall-cmd --state
关闭防火墙的命令:
systemctl stop firewalld.service
systemctl disable firewalld.service (禁止开机启动,永久关闭防火墙)
关闭防火墙后重启即可。
- 验证是否成功
在命令行中输入:zkCli.sh -server 172.16.18.198:2181(由于本人在不同的办公地点在修改该文章,所以ip地址也在变化,知道原理即可)即可连接到其中一台ZooKeeper服务器。其他自动实现同步,客户端只需要和一台保持连接即可。出现如下表示链接成功
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: 172.16.18.198:2181(CONNECTED) 0]