docker安装elastic

可以按照以下步骤在docker中安装elastic：

1. 使用docker拉取elastic image：`docker pull docker.elastic.co/elasticsearch/elasticsearch:<version>`

2. 创建一个新的容器并运行elastic：`docker run -d --name <container_name> -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:<version>`

其中，`<version>`为elastic的版本号，`<container_name>`为你自己指定的容器名称。

3. 验证elastic是否运行成功：在浏览器中访问http://localhost:9200/，如果返回类似以下的JSON格式响应，则说明elastic已经安装并运行成功：

{
  "name" : "xxx",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "xxx",
  "version" : {
    "number" : "7.12.1",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "3186837139b9c6b6d23c3200870651f10d3343b3",
    "build_date" : "2021-04-20T20:56:39.040728659Z",
    "build_snapshot" : false,
    "lucene_version" : "8.8.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}