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12
technology/tools/Docker Compose.md
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@ -7,6 +7,8 @@ repo: https://github.com/docker/compose
# Docker Compose
Compose is a tool for defining and running multi-container [Docker](Docker.md) applications. With Compose, you use a [YAML](../files/YAML.md) file to configure your application's services. Then, with a single command, you create and start all the services from your configuration.
#todo -> add docker-compose cli usage
## Docker Compose file
The Compose file is a [YAML](../files/YAML.md) file defining:
- Version (Optional)
@ -26,7 +28,7 @@ services:
build: ./dir
``````
Or, as an object with the path specified under context and optionally Dockerfile and args:
Or, as an object with the path specified under context and optionally [Dockerfile](Dockerfile.md) and args:
```yaml
version: "3.8"
services:
@ -44,7 +46,7 @@ Override the default command.
command: bundle exec thin -p 3000
```
The command can also be a list, in a manner similar to dockerfile:
The command can also be a list, in a manner similar to [dockerfile](Dockerfile.md):
```yaml
command: ["bundle", "exec", "thin", "-p", "3000"]
```
@ -76,7 +78,7 @@ devices:
### `entrypoint`
`entrypoint` declares the default entrypoint for the service container. This overrides the ENTRYPOINT instruction from the service's Dockerfile.
If entrypoint is non-null, Compose ignores any default command from the image, for example the CMD instruction in the Dockerfile.
If entrypoint is non-null, Compose ignores any default command from the image, for example the CMD instruction in the [Dockerfile](Dockerfile.md).
In its short form, the value can be defined as a string:
```yaml
@ -120,9 +122,9 @@ environment:
When both env_file and environment are set for a service, values set by environment have precedence.
### `healthcheck`
`healthcheck` declares a check that's run to determine whether or not the service containers are "healthy". It works in the same way, and has the same default values, as the HEALTHCHECK Dockerfile instruction
`healthcheck` declares a check that's run to determine whether or not the service containers are "healthy". It works in the same way, and has the same default values, as the HEALTHCHECK [Dockerfile](Dockerfile.md) instruction
set by the service's [Docker](Docker.md) image. Your Compose file can override the values set in the Dockerfile.
set by the service's [Docker](Docker.md) image. Your Compose file can override the values set in the [Dockerfile](Dockerfile.md).
```yaml
healthcheck: