使用Docker卷持久化数据库 [英] Persisting database using docker volumes
问题描述
我正在尝试将postgres数据保留在Docker容器中,以便一旦您 docker-compose down和docker-compose up -d
,您就不会丢失上次会话中的数据。我无法做任何事情-拉下容器并再次备份会定期删除数据。
I'm trying to persist postgres data in a docker container so that as soon as you docker-compose down and docker-compose up -d
you don't lose data from your previous session. I haven't been able to make it do much of anything - pulling the container down and back up again routinely deletes the data.
这是我当前的docker-compose.yml :
Here's my current docker-compose.yml:
version: '2'
services:
api:
build: .
ports:
- '8245:8245'
volumes:
- .:/home/app/api
- /home/app/api/node_modules
- /home/app/api/public/src/bower_components
links:
- db
db:
build: ./database
env_file: .env
ports:
- '8246:5432'
volumes_from:
- dbdata
dbdata:
image: "postgres:9.5.2"
volumes:
- /var/lib/postgresql/data
帮助?
推荐答案
根据停泊Docker Compose ,当您编写如下内容时:
According to the Dockment of Docker Compose, when you write something like:
volumes:
- /var/lib/postgresql/data
它将创建一个新的泊坞窗卷并将其映射到容器内的 / var / lib / postgresql / data
中。
因此,每次您运行 docker-compose up
和 docker-compose down
时,都会创建新卷。您可以使用 docker volume ls
确认行为。
It creates a new docker volume and map it to /var/lib/postgresql/data
inside the container.
Therefore, each time you run docker-compose up
and docker-compose down
, it creates new volume. You can confirm the behavior with docker volume ls
.
要避免这种情况,您有两种选择:
To avoid it, you have two options:
(A)将主机目录映射到容器中
您可以将主机目录映射到容器中使用< HOST_PATH>:< CONTAINER_PATH>
。
You can map directory of host into container using <HOST_PATH>:<CONTAINER_PATH>
.
volumes:
- /path/to/your/host/directory:/var/lib/postgresql/data
postgresql的数据将保存到容器主机的 / path / to / your / host /目录
。
The data of postgresql will be saved into /path/to/your/host/directory
of the container host.
(B)使用外部容器
docker-compose具有外部容器。
设置为true时,不会总是创建音量。
这是一个示例。
docker-compose has an option of external container. When it is set to true, it won't always create volume. Here's an example.
version: '2'
services:
dbdata:
image: postgres:9.5.2
volumes:
- mypostgresdb:/var/lib/postgresql/data
volumes:
mypostgresdb:
external: true
带有 external:true
,docker-compose不会创建 mypostgredb
卷,因此您必须使用以下命令自行创建卷:
With external: true
, docker-compose won't create the mypostgredb
volume, so you have to create it by your own using following command:
docker volume create --name=mypostgredb
postgresql的数据将保存到名为 mypostgredb
的Docker卷中。阅读参考以获得更多详细信息。
The data of postgresql will be saved into docker volume named mypostgredb
. Read reference for more detail.
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