如何在docker compose中的服务之间共享用户？

如何在docker compose中的服务之间共享用户？我可以创建卷并将其装入/etc/container目录，但它会隐藏另一个文件/目录。有没有更聪明的方法来实现这个目标？

您只能在docker容器中装入文件

volumes:
    - /etc/mysql.cnf:/etc/mysql.cnf

---

您可以使用

卷

+

绑定装载

将一个容器的

passwd

&

组

装载到另一个容器

volumes:
    - /etc/mysql.cnf:/etc/mysql.cnf

下面是一个例子：

如果不使用卷，只需在测试服务中验证原始no

mysql

user：

docker\u compose.yaml:

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
test:
  image: ubuntu:16.04
  command: id mysql
  depends_on:
    - db

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - my_etc:/etc
  test:
    image: ubuntu:16.04
    command: id mysql
    depends_on:
      - db
    volumes:
      - /tmp/etc-data/passwd:/etc/passwd
      - /tmp/etc-data/group:/etc/group

volumes:
  my_etc:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: '/tmp/etc-data'

$ mkdir -p /tmp/etc-data
$ docker-compose up
Creating network "23_default" with the default driver
Creating 23_db_1 ... done
Creating 23_test_1 ... done
Attaching to 23_db_1, 23_test_1
db_1    | Initializing database
test_1  | uid=999(mysql) gid=999(mysql) groups=999(mysql)
23_test_1 exited with code 0

作为下一个执行：

$ docker-compose up
Creating network "23_default" with the default driver
Creating 23_db_1 ... done
Creating 23_test_1 ... done
Attaching to 23_db_1, 23_test_1
test_1  | id: 'mysql': no such user
db_1    | Initializing database
23_test_1 exited with code 1

从上面，您可以看到

ubuntu:16.04

中的容器没有用户

mysql

，这是

mysql

中的默认用户：

test|1 | id:'mysql'：没有这样的用户

使用卷使

用户mysql

对

测试

容器可见：

docker\u compose.yaml:

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
test:
  image: ubuntu:16.04
  command: id mysql
  depends_on:
    - db

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - my_etc:/etc
  test:
    image: ubuntu:16.04
    command: id mysql
    depends_on:
      - db
    volumes:
      - /tmp/etc-data/passwd:/etc/passwd
      - /tmp/etc-data/group:/etc/group

volumes:
  my_etc:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: '/tmp/etc-data'

$ mkdir -p /tmp/etc-data
$ docker-compose up
Creating network "23_default" with the default driver
Creating 23_db_1 ... done
Creating 23_test_1 ... done
Attaching to 23_db_1, 23_test_1
db_1    | Initializing database
test_1  | uid=999(mysql) gid=999(mysql) groups=999(mysql)
23_test_1 exited with code 0

按下一步执行，注意：我们需要在启动之前添加新的

/tmp/etc数据：

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
test:
  image: ubuntu:16.04
  command: id mysql
  depends_on:
    - db

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - my_etc:/etc
  test:
    image: ubuntu:16.04
    command: id mysql
    depends_on:
      - db
    volumes:
      - /tmp/etc-data/passwd:/etc/passwd
      - /tmp/etc-data/group:/etc/group

volumes:
  my_etc:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: '/tmp/etc-data'

$ mkdir -p /tmp/etc-data
$ docker-compose up
Creating network "23_default" with the default driver
Creating 23_db_1 ... done
Creating 23_test_1 ... done
Attaching to 23_db_1, 23_test_1
db_1    | Initializing database
test_1  | uid=999(mysql) gid=999(mysql) groups=999(mysql)
23_test_1 exited with code 0

从上面可以看到

test

服务已经可以拥有用户

mysql

：

测试1 | uid=999（mysql）gid=999（mysql）groups=999（mysql）

一点解释：

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
test:
  image: ubuntu:16.04
  command: id mysql
  depends_on:
    - db

version: "3"

services:
  db:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - my_etc:/etc
  test:
    image: ubuntu:16.04
    command: id mysql
    depends_on:
      - db
    volumes:
      - /tmp/etc-data/passwd:/etc/passwd
      - /tmp/etc-data/group:/etc/group

volumes:
  my_etc:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: '/tmp/etc-data'

$ mkdir -p /tmp/etc-data
$ docker-compose up
Creating network "23_default" with the default driver
Creating 23_db_1 ... done
Creating 23_test_1 ... done
Attaching to 23_db_1, 23_test_1
db_1    | Initializing database
test_1  | uid=999(mysql) gid=999(mysql) groups=999(mysql)
23_test_1 exited with code 0

上述解决方案首先使用

命名卷

将

第一个容器

的

/etc

文件夹弹出到docker主机上的

/tmp/etc data

文件夹，然后第二个容器将使用

绑定装载

将

passwd

和

group

单独装载到第二个容器。如您所见，第二个容器只装载了2个文件（

passwd

，

group

），因此它不会隐藏任何其他文件