【发布时间】：2020-12-17 11:51:09
【问题描述】：
我有一个在 docker 上运行的 Django 应用程序，它连接到同一主机上另一个容器中的数据库。这似乎可以正常工作，但是当我尝试更改与另一台服务器上的数据库的连接时，它无法连接。不仅如此，当我尝试在浏览器（如 admin 或 api）中连接到 Django 应用程序时，我没有得到任何响应，并且在输出日志中看不到任何活动。如果我在容器外运行应用程序，它可以在远程数据库上正常运行，并且数据库设置为接受我尝试连接的用户的所有 IP。
关于我为什么没有连接的任何想法？
Dockerfile：
FROM python:3.8-alpine
ENV PATH="/scripts:${PATH}"
COPY ./requirements.txt /requirements.txt
RUN apk add --update --no-cache --virtual .tmp gcc libc-dev linux-headers
RUN apk add mariadb-dev python3-dev postgresql-dev
RUN pip install -r /requirements.txt
RUN apk del .tmp
RUN mkdir /app_django
COPY ./app_django /app_django
WORKDIR /app_django
COPY ./scripts /scripts
RUN chmod +x /scripts/*
RUN mkdir -p /vol/web/media
RUN mkdir -p /vol/web/static
RUN adduser -D user
RUN chown -R user:user /vol
RUN chmod -R 755 /vol/web
USER user
CMD ["entrypoint.sh"]
docker-compose.yml
version: '3.7'
services:
db:
build: mysql/
environment:
MYSQL_ROOT_PASSWORD: 'password'
MYSQL_DATABASE: database
volumes:
- ./mysql/data:/var/lib/mysql
- ./mysql/conf:/etc/mysql/conf.d
- ./mysql/entrypoint-initdb.d:/docker-entrypoint-initdb.d/
- ./mysql/backup_database:/var/local/mysql/backups
ports:
- 3306:3306
restart: always
pdb:
build:
context: .
ports:
- "8000:8000"
volumes:
- ./pdb_django:/pdb_django
command: sh -c "python manage.py runserver 0.0.0.0:8000"
environment:
- DEBUG=1
入口点.sh
#!/bin/sh
set -e
python manage.py collectstatic --noinput
uwsgi --socket :8000 --master --enable-threads --module app.wsgi
Django db 设置（注释部分用于连接到宿主容器上的 db）：
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'database',
'HOST': '<remote IP>',
# 'HOST': 'db',
'USER': 'user',
'PASSWORD': 'password',
'PORT': '3308'
# 'PORT': '3306',
}
}
requirements.txt
Django==3.1.4
uWSGI>=2.0.18,<2.1
django-filter==2.4.0
djangorestframework==3.12.2
mysql-connector-python==8.0.22
mysqlclient==2.0.2
PyMySQL==0.10.1
sqlparse==0.4.1
应用程序的输出日志：
pdb_1 | Watching for file changes with StatReloader
pdb_1 | Exception in thread django-main-thread:
pdb_1 | Traceback (most recent call last):
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
pdb_1 | self.connect()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 200, in connect
pdb_1 | self.connection = self.get_new_connection(conn_params)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 234, in get_new_connection
pdb_1 | return Database.connect(**conn_params)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/MySQLdb/__init__.py", line 130, in Connect
pdb_1 | return Connection(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in __init__
pdb_1 | super().__init__(*args, **kwargs2)
pdb_1 | MySQLdb._exceptions.OperationalError: (2002, "Can't connect to MySQL server on '<remote IP>' (115)")
pdb_1 |
pdb_1 | The above exception was the direct cause of the following exception:
pdb_1 |
pdb_1 | Traceback (most recent call last):
pdb_1 | File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
pdb_1 | self.run()
pdb_1 | File "/usr/local/lib/python3.8/threading.py", line 870, in run
pdb_1 | self._target(*self._args, **self._kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/autoreload.py", line 53, in wrapper
pdb_1 | fn(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/core/management/commands/runserver.py", line 121, in inner_run
pdb_1 | self.check_migrations()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 459, in check_migrations
pdb_1 | executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 18, in __init__
pdb_1 | self.loader = MigrationLoader(self.connection)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/migrations/loader.py", line 53, in __init__
pdb_1 | self.build_graph()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/migrations/loader.py", line 216, in build_graph
pdb_1 | self.applied_migrations = recorder.applied_migrations()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/migrations/recorder.py", line 77, in applied_migrations
pdb_1 | if self.has_table():
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/migrations/recorder.py", line 55, in has_table
pdb_1 | with self.connection.cursor() as cursor:
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 259, in cursor
pdb_1 | return self._cursor()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
pdb_1 | self.ensure_connection()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
pdb_1 | self.connect()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
pdb_1 | raise dj_exc_value.with_traceback(traceback) from exc_value
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
pdb_1 | self.connect()
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 200, in connect
pdb_1 | self.connection = self.get_new_connection(conn_params)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
pdb_1 | return func(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 234, in get_new_connection
pdb_1 | return Database.connect(**conn_params)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/MySQLdb/__init__.py", line 130, in Connect
pdb_1 | return Connection(*args, **kwargs)
pdb_1 | File "/usr/local/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in __init__
pdb_1 | super().__init__(*args, **kwargs2)
pdb_1 | django.db.utils.OperationalError: (2002, "Can't connect to MySQL server on '<remote IP>' (115)")
【问题讨论】：
-
应用程序正在尝试连接到不是有效 ip 的“
”。在 Django 数据库设置中设置正确的 ip -
@IgorMoraru 嗨，出于安全原因，我在发布之前将其更改为
，在原始代码中它是一个有效的 IP -
你是否更改了远程运行mysql的端口，因为在你的设置中它是3308，但默认是3306
-
@IgorMoraru 是的，远程数据库实际上也在一个 docker 容器中。服务器有多个数据库容器。这是一个测试数据库，因此它被设置为与默认不同的端口
-
你能显示 entrypoint.sh 吗？