Ubuntu 18 下安装zookeeper
下载zookeeper的压缩包，
下载地址： http://apache.fayea.com/zookeeper/
1. 下载完成后，解压安装包，解压到/home/wsk1103/software/zookeeper目录下
tar zxvf zookeeper-3.4.12.tar.gz -C /home/wsk1103/software/zookeeper
2. 拷贝zookeeper/conf/目录下的zoo_sample.cfg，重新命名为zoo.cfg.
3. 编辑该配置文件，gedit zoo.cfg 修改为
# The number of milliseconds of each tick
# 心跳间隔，毫秒
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
# 配置zookeeper接受客户端初始化连接时最长能忍受多少个时间心跳间隔。
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
# 这个配置项标识 Leader 与 Follower 之间发送消息，请求和应答时间长度，最长不能超过多少个 tickTime 的时间长度。
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
# 数据存放的位置
dataDir=/home/wsk1103/sofrware/zookeeper/zookeeperData
#日志存放的位置
dataLogDir=/home/wsk1103/sofrware/zookeeper/zookeeperLog
# the port at which the clients will connect
# 服务器客户端的接口
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
# 2888,3888 are election port
# 2888端口是zookeeper服务之间的通讯的端口，3888是zookeeper与其他应用程序通讯的端口。
server.1=localhost:2888:3888重点是中间添加了
dataDir=/home/wsk1103/sofrware/zookeeper/zookeeperData
dataLogDir=/home/wsk1103/sofrware/zookeeper/zookeeperLog结尾添加了
server.1=localhost:2888:3888- 根据中间添加的文件路径，创建相应的文件夹，并在zookeeperData目录下创建新的文件-myid，里面的内容为1，
1表示当前的zookeeper定义为第一台服务器，
新建文件命令：touch myid - 启动zookeeper服务器，进入zookeeper/bin目录，执行 ./zkServer.sh start 命令。就可以启动服务器。
- 检验服务器命令, ./zkCli.sh -server localhost:2181。可以看到控制台的输出没有报错表示以及启动成功。
- 停止服务器命令，./zkServer.sh stop