mongodb - GitLab CI:Docker容器无法连接到MongoDB服务

Question

在GitLab CI管道中，我需要将自己的C++代码从Docker容器连接到以servive身份运行的MongoDB，但无法连接。

这是显示问题的最小gitlab-ci.yml示例:

stages:
  - connect1
  - connect2

image: docker:latest

variables:
  MONGOIMAGE: "mongo:4.2.3-bionic"
  MONGO_INITDB_ROOT_USERNAME: "root"
  MONGO_INITDB_ROOT_PASSWORD: "geheim"

connect1:
  stage: connect1
  services:
    - name: $MONGOIMAGE
  image: mongo
  script:
    - mongo --host mongo --username $MONGO_INITDB_ROOT_USERNAME --password $MONGO_INITDB_ROOT_PASSWORD --eval "db.help()"

connect2:
  stage: connect2
  services:
    - name: $MONGOIMAGE
  script:
    - docker run --rm mongo mongo --host mongo --username $MONGO_INITDB_ROOT_USERNAME --password $MONGO_INITDB_ROOT_PASSWORD --eval "db.help()"

connect2的错误消息是找不到主机:

connecting to: mongodb://mongo:27017/?compressors=disabled&gssapiServiceName=mongodb
2020-06-04T16:20:47.614+0000 E  QUERY    [js] Error: couldn't connect to server mongo:27017, connection attempt failed: HostNotFound: Could not find address for mongo:27017: SocketException: Host not found (authoritative) :
connect@src/mongo/shell/mongo.js:341:17
@(connect):2:6
2020-06-04T16:20:47.615+0000 F  -        [main] exception: connect failed
2020-06-04T16:20:47.615+0000 E  -        [main] exiting with code 1

我已经尝试过 --host localhost，但这正在工作中。我怎样才能获得以 docker run开头的容器(如connect2中的容器)可以连接到MongoDB服务？

Answer 1

终于我找到了解决方案:

connect2:
  stage: connect2
  services:
    - name: $MONGOIMAGE
  script:
    - ping mongo -c 5
    - docker run --rm mongo mongo --add-host mongo:`cat /etc/hosts | grep mongo | awk '{print $1}'` --net host --username $MONGO_INITDB_ROOT_USERNAME --password $MONGO_INITDB_ROOT_PASSWORD --eval "db.help()"