在扩容前，请先确认原集群配置。后文将以3节点BCM ZooKeeper集群扩容到5节点为例，介绍ZooKeeper集群扩容操作。此处以部署ZooKeeper集群部署的BCM ZooKeeper集群配置文件为例，查询并确认与原集群配置。

操作步骤

使用vim编辑器查询配置文件详细信息。

1	vim /opt/apache-zookeeper-3.6.3-bin-bcm/conf/zoo.cfg

获取原集群配置信息如下。

# The number of milliseconds of each tick
tickTime=1000
# 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=2
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
dataDir=/opt/apache-zookeeper-3.6.3-bin-bcm/zkData
# 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=333
#
# 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=3

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
server.1=ceph1:2889:3889;2182
server.2=ceph2:2889:3889;2182
server.3=ceph3:2889:3889;2182
4lw.commands.whitelist=*

确认扩容前原集群配置

操作步骤