“ZooKeeper 集群”的版本间的差异
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Jihongchang（讨论 | 贡献） |
Jihongchang（讨论 | 贡献） |
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| （未显示同一用户的4个中间版本） | |||
| 第39行： | 第39行： | ||
=== 搭建 ZooKeeper 集群 === | === 搭建 ZooKeeper 集群 === | ||
| − | <syntaxhighlight lang="yaml"> | + | |
| + | |||
| + | docker-compose.yml<syntaxhighlight lang="yaml"> | ||
version: "3.1" | version: "3.1" | ||
| − | services: | + | services: |
zk1: | zk1: | ||
image: zookeeper | image: zookeeper | ||
restart: always | restart: always | ||
container_name: zk1 | container_name: zk1 | ||
| − | + | ports: | |
| − | - 2181: | + | - 2181:2181 |
environment: | environment: | ||
ZOO_MY_ID: 1 | ZOO_MY_ID: 1 | ||
| − | + | ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181 | |
zk2: | zk2: | ||
image: zookeeper | image: zookeeper | ||
restart: always | restart: always | ||
container_name: zk2 | container_name: zk2 | ||
| − | + | ports: | |
| − | - 2181 | + | - 2182:2181 |
environment: | environment: | ||
ZOO_MY_ID: 2 | ZOO_MY_ID: 2 | ||
| − | + | ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181 | |
zk3: | zk3: | ||
image: zookeeper | image: zookeeper | ||
restart: always | restart: always | ||
container_name: zk3 | container_name: zk3 | ||
| − | + | ports: | |
| − | - 2181 | + | - 2183:2181 |
environment: | environment: | ||
ZOO_MY_ID: 3 | ZOO_MY_ID: 3 | ||
| − | + | ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181 | |
| + | |||
| + | </syntaxhighlight><syntaxhighlight lang="shell-session"> | ||
| + | [root@bogon docker_zk]# docker-compose up -d | ||
| + | Creating network "dockerzk_default" with the default driver | ||
| + | Creating zk3 ... done | ||
| + | Creating zk3 ... | ||
| + | Creating zk2 ... | ||
| + | [root@bogon docker_zk]# docker ps -a | ||
| + | CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES | ||
| + | 03a5d98fbf6f zookeeper "/docker-entrypoint.…" 8 seconds ago Up 5 seconds 2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2182->2181/tcp, :::2182->2181/tcp zk2 | ||
| + | 15cc59636d4e zookeeper "/docker-entrypoint.…" 8 seconds ago Up 5 seconds 2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2183->2181/tcp, :::2183->2181/tcp zk3 | ||
| + | 5033aa3ffae0 zookeeper "/docker-entrypoint.…" 8 seconds ago Up 6 seconds 2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, :::2181->2181/tcp, 8080/tcp zk1 | ||
| + | [root@bogon docker_zk]# | ||
| + | |||
</syntaxhighlight> | </syntaxhighlight> | ||
2022年8月17日 (三) 00:27的最新版本
ZooKeeper 集群的特点
有主从之分
ZooKeeper 集群中必须有 master 节点，否则 ZooKeeper 无法正常工作
master：执行读写操作
slave：执行读操作
ZooKeeper 集群的投票机制，在没有 master 节点时，会重新选举
ZooKeeper 集群架构图
ZooKeeper 集群中节点的角色
1、Leader：Master 主节点
2、Follower：从节点，参与选举全新的 Leader
3、Observer：从节点，不参与投票
4、Looking：正在找 Leader 节点的节点
ZooKeeper 投票策略
1、每一个 ZooKeeper 服务都会被分配一个全局唯一的 myid，myid 是一个数字。
2、ZooKeeper 在执行写数据时，每一个节点都有一个自己的 FIFO 的队列。保证写每一个数据的时候，顺序是不会乱的，ZooKeeper 还会给每一个数据分配一个全局唯一的 zxid，数据越新 zxid 越大。
选举 Leader：
1、选举出 zxid 最大的节点作为 Leader。
2、在 zxid 相同的节点中，选举出一个 myid 最大的节点，作为 Leader。
搭建 ZooKeeper 集群
docker-compose.yml
version: "3.1"
services:
zk1:
image: zookeeper
restart: always
container_name: zk1
ports:
- 2181:2181
environment:
ZOO_MY_ID: 1
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
zk2:
image: zookeeper
restart: always
container_name: zk2
ports:
- 2182:2181
environment:
ZOO_MY_ID: 2
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
zk3:
image: zookeeper
restart: always
container_name: zk3
ports:
- 2183:2181
environment:
ZOO_MY_ID: 3
ZOO_SERVERS: server.1=zk1:2888:3888;2181 server.2=zk2:2888:3888;2181 server.3=zk3:2888:3888;2181
[root@bogon docker_zk]# docker-compose up -d
Creating network "dockerzk_default" with the default driver
Creating zk3 ... done
Creating zk3 ...
Creating zk2 ...
[root@bogon docker_zk]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
03a5d98fbf6f zookeeper "/docker-entrypoint.…" 8 seconds ago Up 5 seconds 2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2182->2181/tcp, :::2182->2181/tcp zk2
15cc59636d4e zookeeper "/docker-entrypoint.…" 8 seconds ago Up 5 seconds 2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2183->2181/tcp, :::2183->2181/tcp zk3
5033aa3ffae0 zookeeper "/docker-entrypoint.…" 8 seconds ago Up 6 seconds 2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, :::2181->2181/tcp, 8080/tcp zk1
[root@bogon docker_zk]#