docker环境下zookeeper单机搭建、集群搭建

小灰灰 2021-09-24 18:52 762阅读 0赞

# docker环境下zookeeper单机搭建、集群搭建 #

### 文章目录 ###

*  docker环境下zookeeper单机搭建、集群搭建
 *   *  1、单机搭建
     *  2、集群搭建
     *   *  2.1、集群测试
         *  2.2、集群形式，遇到的问题，以及可能会遇到的问题
     *  3、zookeeper再docker下的一些环境变量属性的可配置项

## 1、单机搭建 ##

version: '3.1'
    services:
      zoo1:
        image: zookeeper:latest
        restart: always
        ports:
          - 2181:2181

## 2、集群搭建 ##

version: '3.1'
    services:
      zoo1:
        image: zookeeper:latest
        restart: always
        hostname: zoo1
        ports:
          - 2181:2181
        environment:
          ZOO_MY_ID: 1
          ZOO_SERVERS: server.1=0.0.0.0:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
      zoo2:
        image: zookeeper:latest
        restart: always
        hostname: zoo2
        ports:
          - 2182:2181
        environment:
          ZOO_MY_ID: 2
          ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=0.0.0.0:2888:3888;2181 server.3=zoo3:2888:3888;2181
      zoo3:
        image: zookeeper:latest
        restart: always
        hostname: zoo3
        ports:
          - 2183:2181
        environment:
          ZOO_MY_ID: 3
          ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=0.0.0.0:2888:3888;2181

### 2.1、集群测试 ###

启动集群

docker-compose up -d

查看运行中的zookeeper实例

docker ps

![a63d89487439859626de44d62f3fa5c8.png][]

zookeeper容器的实例id分别是

66de1c1687e8
    
    751a4c11bbcc
    
    193b327a9c59

交互模式下分别进入三个zookeeper容器实例

docker exec -it 66de1c1687e8 /bin/bash
    docker exec -it 751a4c11bbcc /bin/bash
    docker exec -it 193b327a9c59 /bin/bash

三个zookeeper容器实例中，查看集群状态

./bin/zkServer.sh status

**副节点**

![3a6092857d644538cd8022e2aad1627c.png][]

**主节点**

![0660978eb2c089da28d3f89013797b1c.png][]

成功了；

### 2.2、集群形式，遇到的问题，以及可能会遇到的问题 ###

1、通过上面的图，可以看到，我当前拉取的`zookeeper:latest`版本，是`3.6.2`版本；之前（两三年之前吧）再linux环境下，搭建的集群用的是`3.4.x`版本；

**这两个版本，再zoo.cfg配置文件中，新的版本，是多加了`;2181`;如果不加的话，是会报错的~**

server.1=zoo1:2888:3888;2181 
    server.2=zoo2:2888:3888;2181 
    server.3=zoo3:2888:3888;2181

2、如果搭建集群的时候，没有使用docker-compose的话，直接run指令，运行三个容器，三个容器实例，互相通信，应该是问题的；

这个跟docker的网络模式有关系；Docker有三种网络模式，bridge、host、none，在创建的时候，不指定–network默认是bridge。

`bridge`：为每一个容器分配IP，并将容器连接到一个docker0虚拟网桥，通过docker0网桥与宿主机通信。也就是说，**此模式下，你不能用宿主机的IP+容器映射端口来进行Docker容器之间的通信。**

`host`：容器不会虚拟自己的网卡，配置自己的IP，而是使用宿主机的IP和端口。这样一来，**Docker容器之间的通信就可以用宿主机的IP+容器映射端口**

`none`：无网络。

再使用docker-compose形式的话，会创建一个网络；

**查看所有网络**

docker network ls

![715b933e86f8d50e05cec0a390cff998.png][]

查看对应**网络详情**，得到如下的文本内容

docker network inspect e93d1c70ca25

[
        {
            "Name": "cluster_default",
            "Id": "e93d1c70ca25dfd90aa48486eace9fa8c3df58b8ceaf3141c9b1a289b538e5c1",
            "Created": "2020-09-29T07:48:17.278800683Z",
            "Scope": "local",
            "Driver": "bridge",
            "EnableIPv6": false,
            "IPAM": {
                "Driver": "default",
                "Options": null,
                "Config": [
                    {
                        "Subnet": "172.24.0.0/16",
                        "Gateway": "172.24.0.1"
                    }
                ]
            },
            "Internal": false,
            "Attachable": true,
            "Ingress": false,
            "ConfigFrom": {
                "Network": ""
            },
            "ConfigOnly": false,
            "Containers": {
                "193b327a9c59593d7758da2ce9f23c707b114ce5eba558201ae8743e46bd32e6": {
                    "Name": "cluster_zoo2_1",
                    "EndpointID": "0c7213b1bf35ecabc0d20365d3a3e1a41bbf1792cfbbfa1030f8217f589e19ff",
                    "MacAddress": "02:42:ac:18:00:03",
                    "IPv4Address": "172.24.0.3/16",
                    "IPv6Address": ""
                },
                "66de1c1687e81a3bb6a5f37728bdea147936a3afc6e56d06891b44ae1e2fbd07": {
                    "Name": "cluster_zoo1_1",
                    "EndpointID": "224574b0d254e6db152048106fd9eb8d2927d691bb312285e7c5a0a555062cf3",
                    "MacAddress": "02:42:ac:18:00:02",
                    "IPv4Address": "172.24.0.2/16",
                    "IPv6Address": ""
                },
                "751a4c11bbccd57752cda314c140dfbfd8c07b6018d239de91568d3ca7e1d832": {
                    "Name": "cluster_zoo3_1",
                    "EndpointID": "bab3e579e072750174a2df009384b489f934e76869cd4b6900e34bf7978904c0",
                    "MacAddress": "02:42:ac:18:00:04",
                    "IPv4Address": "172.24.0.4/16",
                    "IPv6Address": ""
                }
            },
            "Options": {},
            "Labels": {
                "com.docker.compose.network": "default",
                "com.docker.compose.project": "cluster",
                "com.docker.compose.version": "1.26.2"
            }
        }
    ]

可以看到，这个三个zookeeper的容器实例，是再一个网络下的，是可以互联的；

## 3、zookeeper再docker下的一些环境变量属性的可配置项 ##

执行容器的启动的时候，可以看到，最终的一个COMMAND指令的，执行了一个`docker-entrypoint.sh`的脚本；内容如下，对照着`zoo.cfg`配置文件，是看一下，就可以了；

#!/bin/bash
    
    set -e
    
    # Allow the container to be started with `--user`
    if [[ "$1" = 'zkServer.sh' && "$(id -u)" = '0' ]]; then
        chown -R zookeeper "$ZOO_DATA_DIR" "$ZOO_DATA_LOG_DIR" "$ZOO_LOG_DIR" "$ZOO_CONF_DIR"
        exec gosu zookeeper "$0" "$@"
    fi
    
    # Generate the config only if it doesn't exist
    if [[ ! -f "$ZOO_CONF_DIR/zoo.cfg" ]]; then
        CONFIG="$ZOO_CONF_DIR/zoo.cfg"
        { 
            echo "dataDir=$ZOO_DATA_DIR" 
            echo "dataLogDir=$ZOO_DATA_LOG_DIR"
    
            echo "tickTime=$ZOO_TICK_TIME"
            echo "initLimit=$ZOO_INIT_LIMIT"
            echo "syncLimit=$ZOO_SYNC_LIMIT"
    
            echo "autopurge.snapRetainCount=$ZOO_AUTOPURGE_SNAPRETAINCOUNT"
            echo "autopurge.purgeInterval=$ZOO_AUTOPURGE_PURGEINTERVAL"
            echo "maxClientCnxns=$ZOO_MAX_CLIENT_CNXNS"
            echo "standaloneEnabled=$ZOO_STANDALONE_ENABLED"
            echo "admin.enableServer=$ZOO_ADMINSERVER_ENABLED"
        } >> "$CONFIG"
        if [[ -z $ZOO_SERVERS ]]; then
          ZOO_SERVERS="server.1=localhost:2888:3888;2181"
        fi
    
        for server in $ZOO_SERVERS; do
            echo "$server" >> "$CONFIG"
        done
    
        if [[ -n $ZOO_4LW_COMMANDS_WHITELIST ]]; then
            echo "4lw.commands.whitelist=$ZOO_4LW_COMMANDS_WHITELIST" >> "$CONFIG"
        fi
    
        for cfg_extra_entry in $ZOO_CFG_EXTRA; do
            echo "$cfg_extra_entry" >> "$CONFIG"
        done
    fi
    
    # Write myid only if it doesn't exist
    if [[ ! -f "$ZOO_DATA_DIR/myid" ]]; then
        echo "${ZOO_MY_ID:-1}" > "$ZOO_DATA_DIR/myid"
    fi
    
    exec "$@"

[a63d89487439859626de44d62f3fa5c8.png]: /images/20210923/45ead1f0d16448649f38919ffb13186b.png
[3a6092857d644538cd8022e2aad1627c.png]: /images/20210923/05b57dc1432147d39da6ffc15f1b1946.png
[0660978eb2c089da28d3f89013797b1c.png]: /images/20210923/ff435a245fa84cd78197e9c27f36aacb.png
[715b933e86f8d50e05cec0a390cff998.png]: /images/20210923/accab015e22d481ab2fb47a475d5cd0a.png