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authorJoshua Lambert <joshua@gitlab.com>2018-08-16 14:32:15 +0000
committerAchilleas Pipinellis <axil@gitlab.com>2018-08-16 14:32:15 +0000
commit22060d3d27a824230a60e49dab0f56b436a9d721 (patch)
tree9a0d5a717846a33609f9ab39714a36f52127ddbd
parent5724eaff8181f6f2cb2bd43c2ba9ba0b5e6be7ad (diff)
downloadgitlab-ce-22060d3d27a824230a60e49dab0f56b436a9d721.tar.gz
Initial kaniko documentation
-rw-r--r--doc/ci/docker/README.md1
-rw-r--r--doc/ci/docker/using_kaniko.md60
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diff --git a/doc/ci/docker/README.md b/doc/ci/docker/README.md
index b0e01d74f7e..8ae80b2bc02 100644
--- a/doc/ci/docker/README.md
+++ b/doc/ci/docker/README.md
@@ -6,3 +6,4 @@ comments: false
- [Using Docker Images](using_docker_images.md)
- [Using Docker Build](using_docker_build.md)
+- [Using kaniko](using_kaniko.md)
diff --git a/doc/ci/docker/using_kaniko.md b/doc/ci/docker/using_kaniko.md
new file mode 100644
index 00000000000..7d4f28e1f47
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+++ b/doc/ci/docker/using_kaniko.md
@@ -0,0 +1,60 @@
+# Building images with kaniko and GitLab CI/CD
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/45512) in GitLab 11.2.
+Requires GitLab Runner 11.2 and above.
+
+[kaniko](https://github.com/GoogleContainerTools/kaniko) is a tool to build
+container images from a Dockerfile, inside a container or Kubernetes cluster.
+
+kaniko solves two problems with using the
+[docker-in-docker build](using_docker_build.md#use-docker-in-docker-executor) method:
+
+1. Docker-in-docker requires [privileged mode](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities)
+ in order to function, which is a significant security concern.
+1. Docker-in-docker generally incurs a performance penalty and can be quite slow.
+
+## Requirements
+
+In order to utilize kaniko with GitLab, a [GitLab Runner](https://docs.gitlab.com/runner/)
+using either the [Kubernetes](https://docs.gitlab.com/runner/executors/kubernetes.html),
+[Docker](https://docs.gitlab.com/runner/executors/docker.html), or
+[Docker Machine](https://docs.gitlab.com/runner/executors/docker_machine.html)
+executors is required.
+
+## Building a Docker image with kaniko
+
+When building an image with kaniko and GitLab CI/CD, you should be aware of a
+few important details:
+
+- The kaniko debug image is recommended (`gcr.io/kaniko-project/executor:debug`)
+ because it has a shell, and a shell is required for an image to be used with
+ GitLab CI/CD.
+- The entrypoint will need to be [overridden](using_docker_images.md#overriding-the-entrypoint-of-an-image),
+ otherwise the build script will not run.
+- A Docker `config.json` file needs to be created with the authentication
+ information for the desired container registry.
+
+---
+
+In the following example, kaniko is used to build a Docker image and then push
+it to [GitLab Container Registry](../../user/project/container_registry.md).
+The job will run only when a tag is pushed. A `config.json` file is created under
+`/root/.docker` with the needed GitLab Container Registry credentials taken from the
+[environment variables](../variables/README.md#predefined-variables-environment-variables)
+GitLab CI/CD provides. In the last step, kaniko uses the `Dockerfile` under the
+root directory of the project, builds the Docker image and pushes it to the
+project's Container Registry while tagging it with the Git tag:
+
+```yaml
+build:
+ stage: build
+ image:
+ name: gcr.io/kaniko-project/executor:debug
+ entrypoint: [""]
+ script:
+ - mkdir -p /root/.docker
+ - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /root/.docker/config.json
+ - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
+ only:
+ - tags
+```