关闭Docker时分离卷(以重新启动)
我有一个Docker Compose(文件名为关闭Docker时分离卷(以重新启动),docker,docker-compose,docker-volume,Docker,Docker Compose,Docker Volume,我有一个Docker Compose(文件名为my main db.yml),它创建了一个MySQL 8.0容器: version: "3.7" services: my-main-db: env_file: - .env image: mysql:8 container_name: my-main-db command: --default-authentication-plugin=mysql_native_password
my main db.yml
),它创建了一个MySQL 8.0容器:
version: "3.7"
services:
my-main-db:
env_file:
- .env
image: mysql:8
container_name: my-main-db
command: --default-authentication-plugin=mysql_native_password
restart: always
ports:
- 3306:3306
environment:
MYSQL_ROOT_PASSWORD: $MY_SERVICE_DB_ROOT_PASSWORD
MYSQL_DATABASE: my_service_db_local
MYSQL_USER: $MY_SERVICE_DB_APP_USER
MYSQL_PASSWORD: $MY_SERVICE_DB_APP_PASSWORD
volumes:
- ./my-service-db-data:/var/lib/mysql
要启动此功能,我运行:
docker-compose -f my-main-db.yml up
它运行得很好,我可以连接到它,也可以通过docker ps
看到它在运行
如果我想停止此容器并保留其中的所有数据,我将使用以下方法将其关闭:
docker-compose -f my-main-db.yml down
但是,如果我想停止此容器并擦除其中的所有数据,以便它启动全新的(干净的),我的理解是我需要分离或删除卷。所以我一直在试图关闭它,就像这样:
docker-compose -f my-main-db.yml down -v
然而,当我这样做,然后启动它备份,我的数据仍然在那里,而我希望有一个全新的(空)数据库
有人能发现我哪里出了问题吗?
docker compose down-v
将删除命名卷,但不会删除作为绑定挂载(如在您的配置中)挂载的目录。为此,您需要自己使用rm-rf
如果要docker compose
管理卷,请改用命名卷:
version: "3.7"
services:
my-main-db:
env_file:
- .env
image: mysql:8
container_name: my-main-db
command: --default-authentication-plugin=mysql_native_password
restart: always
ports:
- 3306:3306
environment:
MYSQL_ROOT_PASSWORD: $MY_SERVICE_DB_ROOT_PASSWORD
MYSQL_DATABASE: my_service_db_local
MYSQL_USER: $MY_SERVICE_DB_APP_USER
MYSQL_PASSWORD: $MY_SERVICE_DB_APP_PASSWORD
volumes:
- my-service-db-data:/var/lib/mysql
volumes:
my-service-db-data:
这将在启动堆栈时自动为您分配docker卷,并在您运行docker compose down-v
时将其删除
例如,如果我在
.env
中有以下内容:
MY_SERVICE_DB_ROOT_PASSWORD=secret
MY_SERVICE_DB_APP_USER=myservice
MY_SERVICE_DB_APP_PASSWORD=secret
我可以打开堆栈:
docker-compose up -d
$ docker-compose up -d
Creating network "docker_default" with the default driver
Creating volume "docker_my-service-db-data" with default driver
WARNING: Found orphan containers (docker_test_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
Creating my-main-db ... done
然后连接到mysql并创建一个表:
$ mysql -h docker -u myservice -psecret my_service_db_local
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.23 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [my_service_db_local]> create table testtable (id int);
Query OK, 0 rows affected (0.065 sec)
MySQL [my_service_db_local]> show tables;
+-------------------------------+
| Tables_in_my_service_db_local |
+-------------------------------+
| testtable |
+-------------------------------+
1 row in set (0.004 sec)
MySQL [my_service_db_local]> ^DBye
现在,如果我用-v
将堆栈向下移动:
$ docker-compose down -v
Stopping my-main-db ... done
WARNING: Found orphan containers (docker_test_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
Removing my-main-db ... done
Removing network docker_default
Removing volume docker_my-service-db-data
…您可以看到Docker已经删除了Docker\u my-service-db-data
音量。如果我们重新启动堆栈:
docker-compose up -d
$ docker-compose up -d
Creating network "docker_default" with the default driver
Creating volume "docker_my-service-db-data" with default driver
WARNING: Found orphan containers (docker_test_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
Creating my-main-db ... done
我们可以连接到mysql,看到这个表已经不存在了,
因为数据库是从头重新创建的:
$ mysql -h docker -u myservice -psecret my_service_db_local
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.23 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [my_service_db_local]> show tables;
Empty set (0.004 sec)
MySQL [my_service_db_local]>
谢谢@larsks(+1),但这似乎不起作用。我确保没有运行任何东西(通过
docker ps
),手动删除我的数据文件夹(my service db data/
),应用您的更改,运行docker compose(与我的问题中发布的命令相同),向其中添加一些数据,关闭它(没有-v
选项),启动它备份,确认数据仍然存在,关闭它(这次使用-v
选项),然后重新启动它。数据仍然存在。我遗漏了什么吗?@Hotmeatballshop我已经为这个问题添加了一个完整的例子。如果您看到的是不同的行为,请确保您使用的正是此答案中的Dockerfile
,并且在使用-v
放下堆栈时,您看到的是来自Docker的相同消息(特别是删除卷Docker\u my-service-db-data
),当我没有在docker compose up
命令中指定-d
时,这一切都不起作用(当我docker compose down
使用-v
时,数据目录永远不会被删除)。但是如果我将-d
添加到up
命令中,一切都会正常工作。谢谢