1.zookeeper解壓的路徑由以下可知：
/home/doctor/opt/zookeeper-3.4.6/conf
本地設定3個zookeeper，配置檔案為：
zoo2.cfg zoo3.cfg zoo.cfg。
zoo.cfg配置：
# 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/doctor/zookeeper/d_1
# 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.
## ## 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=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
zoo2.cfg配置：
# 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/doctor/zookeeper/d_2
# 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.
## ## 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=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
zoo3.cfg 配置：
# 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/doctor/zookeeper/d_3
# the port at which the clients will connect
clientport=2183
# 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.
## ## 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=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889
注意：大家都知道，關鍵是clientport 不能相同。
其次，讓我啟動失敗的配置那就是：datadir=/home/doctor/zookeeper/d_x （d_1,d_2,d_3)
裡面的配置。
大家應該知道在此檔案下需要建立myid檔案，裡面的內容就是對應server.1=localhost:2887:3887 裡面的server.1中的1.例如：
[doctor@localhost d_1]$ pwd
/home/doctor/zookeeper/d_1
[doctor@localhost d_1]$ ls
myid version-2 zookeeper_server.pid
[doctor@localhost d_1]$
[doctor@localhost d_1]$ cat myid
1內容是1,
問題根源：我寫入的內容為1,不後面加了空格，就報錯，啟動不了。
所以，。。。。應該程式讀取配置檔案時候，就應該trim一下吧。。
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