cimg/redis pulls statistics

<div align="center"> <p> <img alt="CircleCI Logo" src="img/circle-circleci.svg?raw=true" width="75" /> <img alt="Docker Logo" src="img/circle-docker.svg?raw=true" width="75" /> <img alt="Redis Logo" src="img/circle-redis.svg?raw=true" width="75" /> </p> <h1>CircleCI Convenience Images => Redis</h1> <h3>A Continuous Integration focused Redis Docker image built to run on CircleCI</h3> </div>

This image is designed to supercede the legacy CircleCI Redis image, circleci/redis.

cimg/redis is a Docker image created by CircleCI with continuous integration builds in mind.

Table of Contents

• Getting Started
• How This Image Works
• Development
• Contributing
• Additional Resources
• License

Getting Started

This image can be used with the CircleCI docker executor as a secondary image. For example:

jobs:
  build:
    docker:
      - image: cimg/go:1.17
      - image: cimg/redis:6.2.6
    steps:
      - checkout

In the above example, the CircleCI Go Docker image is used for the primary container while the Redis image is used as a secondary. More specifically, the tag 6.2.6 is used meaning the version of Redis will be v6.2.6. You can now connect to a Redis instance from the primary image within the steps for this job.

How This Image Works

This image contains the Redis database and its complete toolchain.

RAM

The legacy version of this image, circleci/redis had a RAM variant. This is no longer the case. We're determining how much of a performance increase does this variant actually give before we decide to bring it back. If you used the legacy Redis image and you have data on the ram vs non-ram variant build times, please open a GitHub Issue and let us know.

Tagging Scheme

This image has the following tagging scheme:

cimg/redis:<redis-version>

<redis-version> - The version of Redis to use.

Development

Images can be built and run locally with this repository. This has the following requirements:

• local machine of Linux (Ubuntu tested) or macOS
• modern version of Bash (v4+)
• modern version of Docker Engine (v19.03+)

Cloning For Community Users (no write access to this repository)

Fork this repository on GitHub. When you get your clone URL, you'll want to add --recurse-submodules to the clone command in order to populate the Git submodule contained in this repo. It would look something like this:

git clone --recurse-submodules <my-clone-url>

If you missed this step and already cloned, you can just run git submodule update --recursive to populate the submodule. Then you can optionally add this repo as an upstream to your own:

git remote add upstream https://github.com/CircleCI-Public/cimg-redis.git

Cloning For Maintainers ( you have write access to this repository)

Clone the project with the following command so that you populate the submodule:

git clone --recurse-submodules git@github.com:CircleCI-Public/cimg-redis.git

Generating Dockerfiles

Dockerfiles can be generated for a specific Redis version using the gen-dockerfiles.sh script. For example, to generate the Dockerfile for v6.2.6, you would run the following from the root of the repo:

./shared/gen-dockerfiles.sh 6.2.6

The generated Dockerfile will be located at ./6.2.6/Dockefile. To build this image locally and try it out, you can run the following:

cd 6.2.6
docker build -t test/redis:6.2.6 .
docker run -it test/redis:6.2.6 bash

Building the Dockerfiles

To build the Docker images locally as this repository does, you'll want to run the build-images.sh script:

./build-images.sh

This would need to be run after generating the Dockerfiles first. When releasing proper images for CircleCI, this script is run from a CircleCI pipeline and not locally.

Publishing Official Images (for Maintainers only)

The individual scripts (above) can be used to create the correct files for an image, and then added to a new git branch, committed, etc. A release script is included to make this process easier. To make a proper release for this image, let's use the fake Redis version of v9.99, you would run the following from the repo root:

./shared/release.sh 9.99

This will automatically create a new Git branch, generate the Dockerfile(s), stage the changes, commit them, and push them to GitHub. The commit message will end with the string [release]. This string is used by CircleCI to know when to push images to Docker Hub. All that would need to be done after that is:

• wait for build to pass on CircleCI
• review the PR
• merge the PR

The main branch build will then publish a release.

Incorporating Changes

How changes are incorporated into this image depends on where they come from.

build scripts - Changes within the ./shared submodule happen in its own repository. For those changes to affect this image, the submodule needs to be updated. Typically like this:

cd shared
git pull
cd ..
git add shared
git commit -m "Updating submodule for foo."
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