elasticsearch7.2 集群搭建——docker

#### 1.  环境

- 虚拟机

| 主机名     | IP          |
| ---------- | ----------- |
| 7a(master) | 192.168.0.3 |
| 7b         | 192.168.0.4 |
| 7c         | 192.168.0.5 |

- docker-ce

```
Version:  18.09.7
```

#### 2. 修改linux参数

es 要求Linux 的 参数 vm.max_map_count 至少为 262144

```
# 在文件最后添加一行
sudo vim /etc/sysctl.conf
vm.max_map_count=262144
# 加载设置好的系统参数
sudo sysctl -p
```

#### 3. 准备配置文件

- 目录结构

```
es
├── config
│   └── elasticsearch.yml
├── Dockerfile
├── plugins
└── README
```

- Dockerfile

```
FROM elasticsearch:7.2.0
LABEL maintainer="Erica"

ENV LANG C.UTF-8
ENV TIMEZONE Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TIMEZONE /etc/localtime && echo $TIMEZONE > /etc/timezone

ADD config/elasticsearch.yml /usr/share/elasticsearch/config/elasticsearch.yml
# 需要添加分词插件时使用
#ADD plugins /usr/share/elasticsearch/plugins

EXPOSE 9100 9200 9300
CMD ["elasticsearch"]
```

- 主节点 elasticsearch.yml

```
cluster.name: "myels"
node.name: "master"

node.master: true
node.data: true

network.host: 0.0.0.0
http.port: 9200
transport.tcp.port: 9300
network.publish_host: 192.168.0.3

http.cors.enabled: true
http.cors.allow-origin: "*"

path.data: /usr/share/elasticsearch/data
path.logs: /usr/share/elasticsearch/logs

discovery.seed_hosts:
  - 192.168.0.4:9200
  - 192.168.0.5:9200
cluster.initial_master_nodes:
  - master
```

- 从节点elasticsearch.yml

对应修改 node.name  node.master  network.publish_host

```
# 192.168.0.4
node.name: "slave-1"
node.master: false
network.publish_host: 192.168.0.4
discovery.seed_hosts:
  - 192.168.0.3:9200
  - 192.168.0.5:9200

# 192.168.0.5
node.name: "slave-2"
node.master: false
network.publish_host: 192.168.0.5
discovery.seed_hosts:
  - 192.168.0.3:9200
  - 192.168.0.5:9200

```

#### 4. 构建镜像，启动容器
此处可以考虑使用docker-compse启动，参考最后的官方文档
```
docker build -t es:v1 .
docker run -itd --name estest -p 9200:9200 -p 9300:9300 -e "ES_JAVA_OPTS=-Xms1g -Xmx1g" -v /data/els/data:/usr/share/elasticsearch/data -v /data/els/logs:/usr/share/elasticsearch/logs es:v1
```
#### 打开es head查看
![es.png](https://erica.kkwen.cn/usr/uploads/2019/08/318701587.png)

#### 6. 参考

```
https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html
https://www.elastic.co/guide/en/elasticsearch/reference/7.2/docker.html
```

elasticsearch7.2 集群搭建——docker

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