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Here is my problem setup with GitLab and its integrated CI service. I have a current GitLab 8.1. and a gitlabci-multi-runner (0.6.2) with Docker support. After extending the ubuntu:precise image to include git and build-essentials (now named precise:base) I got the following .gitlab-ci.yml running:
image: precise:base
before_script:
- apt-get install --yes cmake libmatio-dev libblas-dev libsqlite3-dev libcurl4-openssl-dev
- apt-get install --yes libarchive-dev liblzma-dev
build:
script:
- mkdir build/
- cd build
- cmake -D CMAKE_BUILD_TYPE=Debug ../
- make
Now my question is how to include more jobs on different images? Because I need to check if the code compiles (and later on works) on different operating systems like Ubuntu Precise, Ubuntu Trusty, CentOS 6, CentOS 7. To reduce the work I think the best way is to provide different Docker images as base.
Now the questions is how must the .gitlab-ci.yml look like to support this?
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One approach to keeping Docker images small is using multistage builds. A multistage build allows you to use multiple images to build a final product. In a multistage build, you have a single Dockerfile, but can define multiple images inside it to help build the final image.
Docker doesn't do merges of the images, but there isn't anything stopping you combining the dockerfiles if available, and rolling into them into a fat image which you'd need to build.
Can we have a single container with multiple image like nginx + Redis + alpine ? You can have multiple processes inside a container but it wouldn't really be a best practice. Having NGINX and Redis in separate containers but inside the same pod would be better.
No, you can't have multiple gitlab-ci files per repository.
You can define the image to use per job.
For instance:
before_script:
- apt-get install --yes cmake libmatio-dev libblas-dev libsqlite3-dev libcurl4-openssl-dev
- apt-get install --yes libarchive-dev liblzma-dev
build:precise:
image: precise:base
script:
- mkdir build/
- cd build
- cmake -D CMAKE_BUILD_TYPE=Debug ../
- make
build:trusty:
image: trusty:base
script:
- mkdir build/
- cd build
- cmake -D CMAKE_BUILD_TYPE=Debug ../
- make
Your can use Anchors to make the .gitlab-ci.yml more clearly. (But this need GitLab 8.6 and GitLab Runner v1.1.1.)
Like this:
before_script:
- apt-get install --yes cmake libmatio-dev libblas-dev libsqlite3-dev libcurl4-openssl-dev
- apt-get install --yes libarchive-dev liblzma-dev
.build_template: &build_definition
script:
- mkdir build/
- cd build
- cmake -D CMAKE_BUILD_TYPE=Debug ../
- make
build:precise:
image: precise:base
<<: *build_definition
build:trusty:
image: trusty:base
<<: *build_definition
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