dynamic_zookeeper_cluster

• Instructions:
  A ZooKeeper docker image built on ZooKeeper 3.5.1-alpha supports both static and dynamic configuration The docker image supports the following ZooKeeper modes: - STATIC mode - DYNAMIC mode
• Environment:
  OS :Red Hat Enterprise Linux Server release 6.6 (Santiago)
  Kernel: 2.6.32-573.1.1.el6.x86_64
  docker:version 1.4.1
  ZooKeeper: ZooKeeper 3.5.1-alpha
• Install docker
  Follow the [installation guide] (https://docs.docker.com/installation/) to install docker in your system
• Install docker image

docker build -t zookeeper .

####STATIC MODE

• To start the image in static mode you need to specify a couple of environment variables for the container.

Environment Variable	Description	example
MYID	The id of the server	MYID=1
ADDITIONAL_ZOOKEEPER	Zookeeper service USES the IP and port	ADDITIONAL_ZOOKEEPER_1=server.1= localhost:2888:3888:participant;2181
CONFIG_MODE	Create a zookeeper mode	CONFIG_MODE=STATIC

• Start ZooKeeper Cluster with 3 docker containers
  container zk1 is listening on localhost: 2181£¬2888£¬3888
  container zk2 is listening on localhost: 2182£¬2889£¬3889
  container zk3 is listening on localhost: 2183£¬2890£¬3890
  ```txt docker run -d
  --name=zk1
  --net=host
  -v /data/zk1:/tmp/zookeeper
  -e ADDITIONAL_ZOOKEEPER_1=server.1=0.0.0.0:2888:3888:participant;2181
  -e ADDITIONAL_ZOOKEEPER_2=server.2=localhost:2889:3889:participant;2182
  -e ADDITIONAL_ZOOKEEPER_3=server.3=localhost:2890:3890:participant;2183
  -e CONFIG_MODE=STATIC
  -e MYID=1
  zookeeper

docker run -d
--name=zk2
--net=host
-v /data/zk2:/tmp/zookeeper
-e ADDITIONAL_ZOOKEEPER_1=server.1=localhost:2888:3888:participant;2181
-e ADDITIONAL_ZOOKEEPER_2=server.2=0.0.0.0:2889:3889:participant;2182
-e ADDITIONAL_ZOOKEEPER_3=server.3=localhost:2890:3890:participant;2183
-e CONFIG_MODE=STATIC
-e MYID=2
zookeeper

docker run -d \
--name=zk3 \
--net=host \
-v /data/zk3:/tmp/zookeeper \
-e ADDITIONAL_ZOOKEEPER_1=server.1=localhost:2888:3888:participant\;2181 \
-e ADDITIONAL_ZOOKEEPER_2=server.2=localhost:2889:3889:participant\;2182 \
-e ADDITIONAL_ZOOKEEPER_3=server.3=0.0.0.0:2890:3890:participant\;2183 \
-e CONFIG_MODE=STATIC  \
-e MYID=3 \
zookeeper 
```

####DYNAMIC MODE

• To start the image in dynamic mode you need to specify a couple of environment variables for the container.

Environment Variable	Description	example
ZK_URL	The url of one of the zookeeper cluster	localhost:2181
MYSERVER_URL	Zookeeper service using IP and port	MYSERVER_URL=localhost:2891:3891
MYCLIENT_PORT	Clients use port	MYCLIENT_PORT=2184
CONFIG_MODE	Create a zookeeper mode	CONFIG_MODE=DYNAMIC
MYID	The id of the server	MYID=4

• Start ZooKeeper Cluster with 2 docker containers
  container zk4 is listening on localhost: 2184£¬2891£¬3891
  container zk5 is listening on localhost: 2185£¬2892£¬3892

docker run -d \
--name=zk4 \
--net=host \
-v /data/zk4:/tmp/zookeeper \
-e ZK_URL=127.0.0.1:2181 \(Known cluster of any member of the IP and port)
-e MYSERVER_URL=0.0.0.0:2891:3891 \
-e MYCLIENT_PORT=2184 \
-e CONFIG_MODE=DYNAMIC  \
-e MYID=4 \
zookeeper
 
docker run -d \
--name=zk5 \
--net=host \
-v /data/zk5:/tmp/zookeeper \
-e MYSERVER_URL=0.0.0.0:2892:3892 \
-e MYCLIENT_PORT=2185 \
-e CONFIG_MODE=DYNAMIC  \
-e MYID=5 \
zookeeper