Docker-compose环境变量

Question

我正在尝试设置一个postgres容器,并希望设置postgres登录:

POSTGRES_USER: docker
POSTGRES_PASSWORD: docker

所以我像这样创建了docker-compose.yml

web:
  build: .
  ports:
    - "62576:62576"
  links:
   - redis
   - db
db:
  image: postgres
  environment:
    POSTGRES_PASSWORD: docker
    POSTGRES_USER: docker

redis:
   image: redis

我还尝试了环境变量的其他语法,将db部分声明为:

db:
  image: postgres
  environment:
   - POSTGRES_PASSWORD=docker
   - POSTGRES_USER=docker

但是,当我尝试使用各种连接字符串连接到postgres数据库时,无论出于何种原因,这些选项似乎都不起作用:

postgres://postgres:postgres@db:5432/users
postgres://postgres:docker@db:5432/users
postgres://docker:docker@db:5432/users

他们都给我auth失败,而不是抱怨没有用户数据库.

Answer 1

我挣扎了一段时间,并没有得到接受的答案的运气,我终于通过删除容器让它工作:

docker-compose rm postgres

然后音量也是:

docker volume rm myapp_postgres

然后,当我做了一个新鲜的时候,docker-compose up我看到了CREATE ROLE飞过,我假设是最初错过的up.

其中的原因在这里详细阐述了关于postgres的Docker官方形象的Git回购.

Answer 2

如果您使用的是Docker。

尝试检查您的本地数据库是否处于活动状态，因为它主要与 Docker 冲突，如果是，您可以停用它或更改端口号或卸载它以避免冲突。

Answer 3

你得到的身份验证错误会有很大帮助!

我用你的参数激发了postgres图像:

docker run --name db -d -e POSTGRES_PASSWORD=docker -e POSTGRES_USER=docker postgres

然后我执行了:

docker exec -it db psql -U docker user
psql: FATAL:  database "user" does not exist

我收到您期望的错误消息,因为我有信任身份验证:

docker exec -it db cat /var/lib/postgresql/data/pg_hba.conf | grep -v '^#'

local   all             all                                     trust
host    all             all             127.0.0.1/32            trust
host    all             all             ::1/128                 trust
host all all 0.0.0.0/0 md5

为了模拟你的web容器,我将运行postgres容器的另一个实例并链接db容器,然后连接回db容器:

core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker user
Password for user docker: 
psql: FATAL:  password authentication failed for user "docker"

如果输入错误的密码,我会收到身份验证错误.但是,如果我输入正确的密码:

core@ku1 /tmp/i $ docker run --rm --name web --link db:db -it postgres psql -h db -Udocker user
Password for user docker: 
psql: FATAL:  database "user" does not exist

这一切似乎都正常.我把它全部放在yaml文件中并以这种方式进行测试:

web:
  image: postgres
  command: sleep 999
  ports:
    - "62576:62576"
  links:
   - db
db:
  image: postgres
  environment:
    POSTGRES_PASSWORD: docker
    POSTGRES_USER: docker

然后使用docker-compose启动它:

core@ku1 /tmp/i $ docker-compose -f dc.yaml up
Creating i_db_1...
Creating i_web_1...
Attaching to i_db_1, i_web_1
db_1  | ok
db_1  | creating template1 database in /var/lib/postgresql/data/base/1 ... ok
db_1  | initializing pg_authid ... ok
db_1  | initializing dependencies ... ok
db_1  | creating system views ... ok
db_1  | loading system objects' descriptions ... ok
db_1  | creating collations ... ok
db_1  | creating conversions ... ok
db_1  | creating dictionaries ... ok
db_1  | setting privileges on built-in objects ... ok
db_1  | creating information schema ... ok
db_1  | loading PL/pgSQL server-side language ... ok
db_1  | vacuuming database template1 ... ok
db_1  | copying template1 to template0 ... ok
db_1  | copying template1 to postgres ... ok
db_1  | syncing data to disk ... ok
db_1  | 
db_1  | WARNING: enabling "trust" authentication for local connections
db_1  | You can change this by editing pg_hba.conf or using the option -A, or
db_1  | --auth-local and --auth-host, the next time you run initdb.
db_1  | 
db_1  | Success. You can now start the database server using:
db_1  | 
db_1  |     postgres -D /var/lib/postgresql/data
db_1  | or
db_1  |     pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1  | 
db_1  | 
db_1  | PostgreSQL stand-alone backend 9.4.1
db_1  | backend> statement: CREATE DATABASE "docker" ;
db_1  | 
db_1  | backend> 
db_1  | 
db_1  | PostgreSQL stand-alone backend 9.4.1
db_1  | backend> statement: CREATE USER "docker" WITH SUPERUSER PASSWORD 'docker' ;
db_1  | 
db_1  | backend> 
db_1  | LOG:  database system was shut down at 2015-04-12 22:01:12 UTC
db_1  | LOG:  database system is ready to accept connections
db_1  | LOG:  autovacuum launcher started
^Z
[1]+  Stopped                 docker-compose -f dc.yaml up
core@ku1 /tmp/i $ bg

您可以看到用户和密码已创建.我执行:

core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db user
Password for user docker: 
psql: FATAL:  password authentication failed for user "docker"
core@ku1 /tmp/i $
db_1  | FATAL:  password authentication failed for user "docker"
db_1  | DETAIL:  Connection matched pg_hba.conf line 95: "host all all 0.0.0.0/0 md5"

core@ku1 /tmp/i $ docker exec -it i_web_1 psql -Udocker -h db user
Password for user docker: 
psql: FATAL:  database "user" does not exist
db_1  | FATAL:  database "user" does not exist

所以我唯一能想到的是你试图从你的主机而不是web容器连接到数据库？或者您的Web容器没有使用'db'作为主机连接？您对Web容器的定义不包含我可以看到的任何错误.

Answer 4

感谢 Bryan 的帮助，docker-compose exec containername env我发现还需要删除卷。由于docker-compose volume rm volumename您需要知道确切的名称，因此使用以下命令删除所有内容会更容易：

docker-compose down --volumes

Answer 5

我有同样的问题,在我的情况下,问题是通过一个命令修复的:

docker-compose up --force-recreate

Answer 6

这帮助了我

docker stop $(docker ps -qa) && docker system prune -af --volumes && docker compose up