阿里云ecs搭建zookeeper集群

准备两台ecs机器，为啥只有两台？因为买不起第三台。。。。好了，回归正题。

准备：

• 两台ecs
• jdk8及以上
• zookeeper， 我这里用的3.4.14

注意事项：

1、zookeeper 集群至少需要三台节点才能搭建集群。

2、ecs中安全组记得开放端口，建议为了便捷直接将ecs的全部端口开放。出，入方向都要设置。

步骤：

1. 目前我是两台ecs，一台上有两个zookeeper节点 ，另一台一个zookeeper节点。
2. 配置hosts文件， 假设两台ip分别是xxx.xx.xxx.x , xxx.x.xxx.xx, 则在每台ecs配置hosts文件，加上  

   xxx.xx.xxx.x   node01
   xxx.x.xxx.xx   node02

   然后刷新网卡， systemctl network restart

3. 在每个zookeeper节点外部创建两个文件夹，并分配权限。

   # 一台
   mkdir data
   mkdir logs
   mkdir cluster-data
   mkdir cluster-logs
   chmod 777 -R data
   chmod 777 -R log
   chmod 777 -R cluster-data
   chmod 777 -R cluster-logs
   
   
   # 另一台
   mkdir data
   mkdir logs
   chmod 777 -R data
   chmod 777 -R logs

   

   

4. 配置节点中zoo.cfg文件

   #  第一个
   # 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=/home/zookeeper/data
   dataLogDir=/home/zookeeper/logs
   # 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
   
   quorumListenOnAllIPs=true
   
   server.1=node01:2888:3888
   server.2=node02:2888:3888
   server.3=node02:2999:3999
   
   
   # 第二个
   # 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=/home/zookeeper/cluster-data
   dataLogDir=/home/zookeeper/cluster-logs
   # the port at which the clients will connect
   clientPort=2182
   # 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
   
   quorumListenOnAllIPs=true
   
   server.1=node01:2888:3888
   server.2=node02:2888:3888
   server.3=node02:2999:3999
   
   # 第三个
   # 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=/home/zookeeper/data
   dataLogDir=/home/zookeeper/logs
   # 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
   
   quorumListenOnAllIPs=true
   
   server.1=node01:2888:3888
   server.2=node02:2888:3888
   server.3=node02:2999:3999
   
   

5. 设置zookeeper 的myid， 必须设置， 通过指定该id达到zookeeper快速选举leader的特性（200ms内）；且必须设置在dataDir目录下。

   # 三个节点都设置， 你们懂的， 一个ecs两个节点的执行两次， 另一个执行一次，别粗心了
   echo "1" > /home/zookeeper/data/myid
   echo "2" > /home/zookeeper/cluster-data/myid
   echo "3" > /home/zookeeper/data/myid

6.   按需启动， 按照myid的大小，从小到大启动。
7. 任何一个节点查看zk的状态，出现这个就是ok的

记住云服务器ecs多了一个配置项，监听所有网卡，我就是这里卡住了。 

quorumListenOnAllIPs=true

补充==========

有个别版本（比如自己装的linux 虚拟机），必须开启防火墙的 ，即需要设置开启防火墙， 并打开对应端口（2888,3888） 

# 防火墙状态
systemctl status firewalld

# 开启防火墙
systemctl start firewalld

# 关闭防火墙
systemctl stop firewalld


# 查看已经开启的端口
firewall-cmd --list-port

# 开放指定的端口
firewall-cmd --zone=public --add-port=这里是需要开启的端口号/tcp --permanent
比如这里是 2888 3888
firewall-cmd --zone=public --add-port=2888/tcp --permanent
firewall-cmd --zone=public --add-port=3888/tcp --permanent

# 刷新设定
firewall-cmd --reload