@ -2,7 +2,7 @@
title: "Bake file definition"
keywords: build, buildx, bake, buildkit, hcl, json, compose
redirect_from:
- /build/customize/bake/file-definition/
- /build/customize/bake/file-definition/
---
`buildx bake` supports HCL, JSON and Compose file format for defining build
@ -10,12 +10,12 @@ redirect_from:
[functions ](#functions ). It looks for build definition files in the current
directory in the following order:
* `docker-compose.yml`
* `docker-compose.yaml`
* `docker-bake.json`
* `docker-bake.override.json`
* `docker-bake.hcl`
* `docker-bake.override.hcl`
- `docker-compose.yml`
- `docker-compose.yaml`
- `docker-bake.json`
- `docker-bake.override.json`
- `docker-bake.hcl`
- `docker-bake.override.hcl`
## Specification
@ -24,7 +24,7 @@ project specific reusable build flows.
### Target
A target reflects a single docker build invocation with the same options that
A target reflects a single ` ` invocation with the same options that
you would specify for `docker build` :
```hcl
@ -34,6 +34,7 @@ target "webapp-dev" {
tags = ["docker.io/username/webapp:latest"]
}
```
```console
$ docker buildx bake webapp-dev
```
@ -46,27 +47,27 @@ $ docker buildx bake webapp-dev
Complete list of valid target fields available for [HCL ](#hcl-definition ) and
[JSON ](#json-definition ) definitions:
| Name | Type | Description |
|---------------------|--------| ---------------------------------------------------------------------------------------------------------------------------------|
| `args` | Map | Set build-time variables (same as [`--build-arg` flag ](../../engine/reference/commandline/buildx_build.md )) |
| Name | Type | Description |
| ------------------- | ------ | ------------------------------------------ --------------------------------------------------------------------------------------------------------------------------------- |
| `args` | Map | Set build-time variables (same as [`--build-arg` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `attest` | Map | Define attestations that should be applied to the image, see [SBOM attestations ](../attestations/sbom.md ) and [Provenance attestations ](../attestations/slsa-provenance.md ) |
| `cache-from` | List | External cache sources (same as [`--cache-from` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `cache-to` | List | Cache export destinations (same as [`--cache-to` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `context` | String | Set of files located in the specified path or URL |
| `contexts` | Map | Additional build contexts (same as [`--build-context` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `dockerfile-inline` | String | Inline Dockerfile content |
| `dockerfile` | String | Name of the Dockerfile (same as [`--file` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `inherits` | List | [Inherit build options ](#merging-and-inheritance ) from other targets |
| `labels` | Map | Set metadata for an image (same as [`--label` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `no-cache-filter` | List | Do not cache specified stages (same as [`--no-cache-filter` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `no-cache` | Bool | Do not use cache when building the image (same as [`--no-cache` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `output` | List | Output destination (same as [`--output` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `platforms` | List | Set target platforms for build (same as [`--platform` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `pull` | Bool | Always attempt to pull all referenced images (same as [`--pull` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `secret` | List | Secret to expose to the build (same as [`--secret` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `ssh` | List | SSH agent socket or keys to expose to the build (same as [`--ssh` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `tags` | List | Name and optionally a tag in the format `name:tag` (same as [`--tag` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `target` | String | Set the target build stage to build (same as [`--target` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `cache-from` | List | External cache sources (same as [`--cache-from` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `cache-to` | List | Cache export destinations (same as [`--cache-to` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `context` | String | Set of files located in the specified path or URL |
| `contexts` | Map | Additional build contexts (same as [`--build-context` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `dockerfile-inline` | String | Inline Dockerfile content |
| `dockerfile` | String | Name of the Dockerfile (same as [`--file` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `inherits` | List | [Inherit build options ](#merging-and-inheritance ) from other targets |
| `labels` | Map | Set metadata for an image (same as [`--label` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `no-cache-filter` | List | Do not cache specified stages (same as [`--no-cache-filter` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `no-cache` | Bool | Do not use cache when building the image (same as [`--no-cache` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `output` | List | Output destination (same as [`--output` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `platforms` | List | Set target platforms for build (same as [`--platform` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `pull` | Bool | Always attempt to pull all referenced images (same as [`--pull` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `secret` | List | Secret to expose to the build (same as [`--secret` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `ssh` | List | SSH agent socket or keys to expose to the build (same as [`--ssh` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `tags` | List | Name and optionally a tag in the format `name:tag` (same as [`--tag` flag ](../../engine/reference/commandline/buildx_build.md )) |
| `target` | String | Set the target build stage to build (same as [`--target` flag ](../../engine/reference/commandline/buildx_build.md )) |
### Group
@ -88,6 +89,7 @@ target "db" {
tags = ["docker.io/username/db"]
}
```
```console
$ docker buildx bake build
```
@ -110,6 +112,7 @@ target "webapp-dev" {
tags = ["docker.io/username/webapp:${TAG}"]
}
```
```console
$ docker buildx bake webapp-dev # will use the default value "latest"
$ TAG=dev docker buildx bake webapp-dev # will use the TAG environment variable value
@ -161,9 +164,9 @@ target "webapp-dev" {
## Built-in variables
* `BAKE_CMD_CONTEXT` can be used to access the main `context` for bake command
- `BAKE_CMD_CONTEXT` can be used to access the main `context` for bake command
from a bake file that has been [imported remotely ](file-definition.md#remote-definition ).
* `BAKE_LOCAL_PLATFORM` returns the current platform's default platform
- `BAKE_LOCAL_PLATFORM` returns the current platform's default platform
specification (e.g. `linux/amd64` ).
## Merging and inheritance
@ -178,12 +181,14 @@ target "webapp-dev" {
tags = ["docker.io/username/webapp:latest"]
}
```
```hcl
# docker-bake2.hcl
target "webapp-dev" {
tags = ["docker.io/username/webapp:dev"]
}
```
```console
$ docker buildx bake -f docker-bake.hcl -f docker-bake2.hcl webapp-dev
```
@ -217,6 +222,7 @@ target "default" {
tags = ["docker.io/username/webapp:latest"]
}
```
```console
$ docker buildx bake
```
@ -265,33 +271,21 @@ target "db" {
},
"group": {
"default": {
"targets": [
"db",
"webapp-dev"
]
"targets": ["db", "webapp-dev"]
}
},
"target": {
"webapp-dev": {
"dockerfile": "Dockerfile.webapp",
"tags": [
"docker.io/username/webapp:${TAG}"
]
"tags": ["docker.io/username/webapp:${TAG}"]
},
"webapp-release": {
"inherits": [
"webapp-dev"
],
"platforms": [
"linux/amd64",
"linux/arm64"
]
"inherits": ["webapp-dev"],
"platforms": ["linux/amd64", "linux/arm64"]
},
"db": {
"dockerfile": "Dockerfile.db",
"tags": [
"docker.io/username/db"
]
"tags": ["docker.io/username/db"]
}
}
}
@ -334,9 +328,7 @@ $ docker buildx bake "https://github.com/docker/cli.git#v20.10.11" --print
{
"group": {
"default": {
"targets": [
"binary"
]
"targets": ["binary"]
}
},
"target": {
@ -349,12 +341,8 @@ $ docker buildx bake "https://github.com/docker/cli.git#v20.10.11" --print
"VERSION": ""
},
"target": "binary",
"platforms": [
"local"
],
"output": [
"build"
]
"platforms": ["local"],
"output": ["build"]
}
}
}
@ -370,6 +358,7 @@ that has been imported remotely, you can use the [`BAKE_CMD_CONTEXT` built-in va
```console
$ cat https://raw.githubusercontent.com/tonistiigi/buildx/remote-test/docker-bake.hcl
```
```hcl
target "default" {
context = BAKE_CMD_CONTEXT
@ -402,6 +391,7 @@ $ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" --pr
$ touch foo bar
$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test"
```
```text
...
> [4/4] RUN ls -l & & stop:
@ -433,6 +423,7 @@ $ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" "htt
```console
$ docker buildx bake "https://github.com/tonistiigi/buildx.git#remote-test" "https://github.com/docker/cli.git#v20.10.11"
```
```text
...
> [4/4] RUN ls -l & & stop:
David Karlsson
2 years ago
committed by