连接到 docker-compose mysql 容器拒绝访问，但运行相同图像的 docker 不会

2021-12-07 00:00:00 docker docker-compose mysql

我在连接到使用 docker-compose 启动的 mysql docker 容器时遇到了一些问题.这是一篇长文(抱歉！).

I am having some issues connecting to the mysql docker container that I have launched with docker-compose. This is a long post (sorry!).

这是我的 docker-compose.yml 文件:

Here is my docker-compose.yml file:

db:
  image: mysql:5.7
  ports:
    - "3306:3306" # I have tried both ports and expose "3306". Still doesn't work 
  environment:
    - MYSQL_ROOT_PASSWORD="secret"
    - MYSQL_USER="django"
    - MYSQL_PASSWORD="secret"
    - MYSQL_DATABASE="myAppDB"

那么:

$> docker-compose build
db uses an image, skipping #expected!
$> docker-compose up
<<LOTS OF OUTPUT>>

好的，现在我有一个已启动并正在运行的 docker 容器运行程序 mysql:5.7.伟大的！或者是吗?在我的 django 应用程序中进行测试时，我收到操作错误，指出不允许用户连接数据库.好的，那么也许是我的 django ?

OK, so now I have an up and running docker container runner mysql:5.7. Great! Or is it? When testing in my django app, I get Operational errors saying that the user isn't allowed to connect the database. Ok, so maybe it's my django then?

$> docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
c7216f99ca0f        mysql:5.7           "docker-entrypoint.sh"   3 minutes ago       Up 3 minutes        0.0.0.0:3306->3306/tcp   sharpfin_db_1

$> docker-machine ip dev
192.168.99.100
$> mysql -h 192.168.99.100 -P 3306 -u django -p
Enter password: 
ERROR 1045 (28000): Access denied for user 'django'@'192.168.99.1' (using password: YES)

好吧，也许这与连接到 docker-compose 容器有关?如果我尝试从 docker 容器内部连接怎么办?

ok so maybe It's something to do with connecting to the docker-compose container? What if I try connecting from inside the docker container?

$> docker exec -it c7216f99ca0f /bin/bash
root@c7216f99ca0f:/#
root@c7216f99ca0f:/# mysql -u django -p                                                                                                                                                           
Enter password: 
ERROR 1045 (28000): Access denied for user 'django'@'localhost' (using password: YES)

好的，所以 docker mysql 不会让我连接，不知道为什么.让我们看看当我尝试在没有 docker-compose 的情况下执行此操作时会发生什么:

ok, so docker mysql won't let me connect, don't know why. Let's see what happens when I try do this without docker-compose:

$> docker run --name run-mysql -e MYSQL_ROOT_PASSWORD="secret" -e MYSQL_USER="django" -e MYSQL_PASSWORD="secret" -e MYSQL_DATABASE="myAppDB" -p "3306:3306" mysql:5.7
<<LOTS OF OUTPUT SAME AS BEFORE>>

好的，现在我们有一个容器，运行与以前相同的图像，并具有相同的设置.(我认为这个断言可能不是真的 - docker-compose 正在做一些与 docker run 不同的事情).

Ok, so now we have a container running the same image as before with the same settings. (I think this assertion is probably not true - docker-compose is doing something different to docker run).

$> docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
73071b929e82        mysql:5.7           "docker-entrypoint.sh"   3 minutes ago       Up 3 minutes        0.0.0.0:3306->3306/tcp   run-mysql

这是我的容器(称为 run-mysql).让我们联系吧！

There's my container (called run-mysql). Let's connect!

$> mysql -h 192.168.99.100 -P 3306 -u django -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| myAppDB            |
+--------------------+
2 rows in set (0.01 sec)

mysql>

好的.可以登录.这很奇怪...从容器内部呢?

Alright. Can log in. That's weird... What about from inside the container?

$> docker exec -it 73071b929e82 /bin/bash
root@73071b929e82:/# mysql -u django -p                                                                                                                                                           
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.7.12 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> SHOW DATABASES;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| myAppDB            |
+--------------------+
2 rows in set (0.00 sec)

mysql>

好的，当我使用 docker run 启动时，我可以从容器外部和内部登录，但不能使用 docker-compose.这是怎么回事?一定是 docker-compose 在幕后做了一些改变数据库初始化方式的事情.

Ok, I can log in from outside and inside the container when I launch with docker run, but not with docker-compose. What's going on? There must be something either docker-compose is doing behind the scenes that changes how the database is initialized.

如果我也尝试使用 root 用户，以上所有内容都完全相同.所以这不是 django 用户的权限问题.

All the above is the exact same if I try with the root user as well. So it's not a permissions issue with the django user.

任何想法如何解决这个问题?

Any ideas how to resolve this?

推荐答案

docker-compose.yml 文件中的环境变量在使用数组定义时不应有引号:

Environment variables in docker-compose.yml file should not have quotes when using array definition:

db:
  image: mysql:5.7
  ports:
    - "3306:3306"
  environment:
    - MYSQL_ROOT_PASSWORD=secret
    - MYSQL_USER=django
    - MYSQL_PASSWORD=secret
    - MYSQL_DATABASE=myAppDB

<小时>

如果您在 docker-compose.yml 文件中使用它们:

db:
  image: mysql:5.7
  ports:
    - "3306:3306"
  environment:
    - MYSQL_ROOT_PASSWORD="secret"
    - MYSQL_USER="django"
    - MYSQL_PASSWORD="secret"
    - MYSQL_DATABASE="myAppDB"

然后运行:

$ docker-compose up -d

并输入正在运行的容器:

and enter running container:

$ docker-compose exec db /bin/bash

你会看到输出:

root@979813643b0c:/# echo $MYSQL_ROOT_PASSWORD                                                                                                                                              
"secret"

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