分布式服务协调技术zookeeper系列(一)—— zookeeper 简介以及linux上的安装(单节点),zookeeperlinux
分布式服务协调技术zookeeper系列(一)—— zookeeper 简介以及linux上的安装(单节点),zookeeperlinux
ZooKeeper简介
ZooKeeper是一个分布式协调服务框架,通常用于解决分布式项目中遇到的一些管理协调的问题,如统一命名服务、分布式配置管理,分布式锁、集群节点状态协调等等。
下载
到http://apache.fayea.com/zookeeper/下载zookeeper-3.4.9,ftp上传至linux
解压
[root@localhost ftpuser]# tar -zxvf zookeeper-3.4.9.tar.gz
创建数据日志目录
在zookeeper的解压目录下创建以下两个文件夹
[root@localhost zookeeper-3.4.9]# mkdir data
[root@localhost zookeeper-3.4.9]# mkdir logs
拷贝配置文件
到zookeeper的解压目录的conf目录下,将zoo_sample.cfg 文件拷贝一份,命名为为 zoo.cfg
[root@localhost conf]# cp zoo_sample.cfg zoo.cfg
修改配置文件
[root@localhost 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
# 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=/home/ftpuser/zookeeper-3.4.9/data
dataLogDir=/home/ftpuser/zookeeper-3.4.9/logs
# the port at which the clients will connect
clientPort=2181
server.1=192.168.2.129:2888:3888
# 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
在zoo.cfg 配置dataDir,dataLogDir,server。
server.A=B:C:D:其中 A 是一个数字,表示这个是第几号服务器;B 是这个服务
器的 IP 地址;C 表示的是这个服务器与集群中的 Leader 服务器交换信息的端口;D 表示的是万一集群中的 Leader 服务器挂了,需要一个端口来重新进行选举,选出一个新的 Leader,而这个端口就是用来执行选举时服务器相互通信的端口。
clientPort 这个端口就是客户端(应用程序)连接 Zookeeper 服务器的端口,Zookeeper 会监听这个端口接受客户端的访问请求
创建 myid 文件
进入/home/ftpuser/zookeeper-3.4.9/data并创建myid文件
[root@localhost conf]# cd /home/ftpuser/zookeeper-3.4.9/data
[root@localhost data]# vi myid
1
编辑 myid 文件,并在对应的 IP 的机器上输入对应的编号。如在 zookeeper 上,myid
文件内容就是 1。如果只在单点上进行安装配置,那么只有一个 server.1
添加环境变量
[root@localhost data]# vi /etc/profile
在文件末尾添加zookeeper 环境变量
# zookeeper env
export ZOOKEEPER_HOME=/home/ftpuser/zookeeper-3.4.9/
export PATH=$ZOOKEEPER_HOME/bin:$PATH
执行source /etc/profile命令是环境变量生效,执行echo $ZOOKEEPER_HOME查看
打开端口
在防火墙中打开要用到的端口 2181、2888、3888。打开/etc/sysconfig/iptables增加以下 3 行
[root@localhost data]# cat /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Thu Jun 2 22:41:13 2016
*filter
:INPUT ACCEPT [5:320]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [4:464]
-A INPUT -p udp -m udp --dport 23 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 23 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2181 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2888 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3888 -j ACCEPT
COMMIT
# Completed on Thu Jun 2 22:41:13 2016
[root@localhost data]#
查看端口启动状态
[root@localhost data]# service iptables status
启动zookeeper
[root@localhost zookeeper-3.4.9]# cd bin
[root@localhost bin]# ll
total 36
-rwxr-xr-x. 1 1001 1001 232 Aug 23 15:39 README.txt
-rwxr-xr-x. 1 1001 1001 1937 Aug 23 15:39 zkCleanup.sh
-rwxr-xr-x. 1 1001 1001 1032 Aug 23 15:39 zkCli.cmd
-rwxr-xr-x. 1 1001 1001 1534 Aug 23 15:39 zkCli.sh
-rwxr-xr-x. 1 1001 1001 1579 Aug 23 15:39 zkEnv.cmd
-rwxr-xr-x. 1 1001 1001 2696 Aug 23 15:39 zkEnv.sh
-rwxr-xr-x. 1 1001 1001 1065 Aug 23 15:39 zkServer.cmd
-rwxr-xr-x. 1 1001 1001 6773 Aug 23 15:39 zkServer.sh
[root@localhost bin]# zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /home/ftpuser/zookeeper-3.4.9/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
查看zookeeper后台日志
[root@localhost ~]# tail -f /home/ftpuser/zookeeper-3.4.9/bin/zookeeper.out
查看zookeeper进程
[root@localhost bin]# jps
2011 QuorumPeerMain
1245 Bootstrap
2030 Jps
[root@localhost bin]#
其中,QuorumPeerMain 是 zookeeper 进程,启动正常。查看状态
[root@localhost bin]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /home/ftpuser/zookeeper-3.4.9/bin/../conf/zoo.cfg
Mode: standalone
[root@localhost bin]#
停止zookeeper进程
[root@localhost bin]# zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /home/ftpuser/zookeeper-3.4.9/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[root@localhost bin]#
客户端连接zookeeper
[root@localhost bin]# ./zkCli.sh -server 192.168.2.129:2181
输入help命令来查看有哪些命令
[zk: 192.168.2.129:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
connect host:port
get path [watch]
ls path [watch]
set path data [version]
rmr path
delquota [-n|-b] path
quit
printwatches on|off
create [-s] [-e] path data acl
stat path [watch]
close
ls2 path [watch]
history
listquota path
setAcl path acl
getAcl path
sync path
redo cmdno
addauth scheme auth
delete path [version]
setquota -n|-b val path
[zk: 192.168.2.129:2181(CONNECTED) 1]
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