dgraph cluster docker-compose 安装

dgraph 是一款基于golang 的图数据库，使用了graphql+ 的查询方式
集群的安装官方也提供了对应的模版，比较简单

docker-compose 文件

我做了一些简单修改（数据存储的问题）

version: "3"
services:
  zero:
    image: dgraph/dgraph:latest
    volumes:
      - ./data0/data-volume:/dgraph
    ports:
      - 5080:5080
      - 6080:6080
    command: dgraph zero --my=zero:5080 --replicas 3
  server_1:
    image: dgraph/dgraph:latest
    hostname: "server_1"
    volumes:
      - ./data1/data-volume:/dgraph
    ports:
      - 8080:8080
      - 9080:9080
    command: dgraph server --my=server_1:7080 --lru_mb=2048 --zero=zero:5080
  server_2:
    image: dgraph/dgraph:latest
    hostname: "server_2"
    volumes:
      - ./data2/data-volume:/dgraph
    ports:
      - 8081:8081
      - 9081:9081
    command: dgraph server --my=server_2:7081 --lru_mb=2048 --zero=zero:5080 -o 1
  server_3:
    image: dgraph/dgraph:latest
    hostname: "server_3"
    volumes:
      - ./data3/data-volume:/dgraph
    ports:
      - 8082:8082
      - 9082:9082
    command: dgraph server --my=server_3:7082 --lru_mb=2048 --zero=zero:5080 -o 2
  ratel:
    image: dgraph/dgraph:latest
    hostname: "ratel"
    ports:
      - 8000:8000
    command: dgraph-ratel

启动

docker-compose up -d

效果

http://localhost:8000

导入数据&&查询测试

• 导入数据

curl localhost:8080/mutate -H "X-Dgraph-CommitNow: true" -XPOST -d $'
{
  set {
   _:luke <name> "Luke Skywalker" .
   _:leia <name> "Princess Leia" .
   _:han <name> "Han Solo" .
   _:lucas <name> "George Lucas" .
   _:irvin <name> "Irvin Kernshner" .
   _:richard <name> "Richard Marquand" .

   _:sw1 <name> "Star Wars: Episode IV - A New Hope" .
   _:sw1 <release_date> "1977-05-25" .
   _:sw1 <revenue> "775000000" .
   _:sw1 <running_time> "121" .
   _:sw1 <starring> _:luke .
   _:sw1 <starring> _:leia .
   _:sw1 <starring> _:han .
   _:sw1 <director> _:lucas .

   _:sw2 <name> "Star Wars: Episode V - The Empire Strikes Back" .
   _:sw2 <release_date> "1980-05-21" .
   _:sw2 <revenue> "534000000" .
   _:sw2 <running_time> "124" .
   _:sw2 <starring> _:luke .
   _:sw2 <starring> _:leia .
   _:sw2 <starring> _:han .
   _:sw2 <director> _:irvin .

   _:sw3 <name> "Star Wars: Episode VI - Return of the Jedi" .
   _:sw3 <release_date> "1983-05-25" .
   _:sw3 <revenue> "572000000" .
   _:sw3 <running_time> "131" .
   _:sw3 <starring> _:luke .
   _:sw3 <starring> _:leia .
   _:sw3 <starring> _:han .
   _:sw3 <director> _:richard .

   _:st1 <name> "Star Trek: The Motion Picture" .
   _:st1 <release_date> "1979-12-07" .
   _:st1 <revenue> "139000000" .
   _:st1 <running_time> "132" .
  }
}
' | python -m json.tool | less

• 查询

  类似graphql 的语法

{
 me(func: has(starring)) {
   name
  }
}

说明

zero 组件运行了一个，实际生产需要运行多个实例（一般是奇数 1， 3， 5）

参考资料

https://docs.dgraph.io/get-started
https://docs.dgraph.io/deploy/