Step 1: Check for CI/CD Setup

Before proceeding with CI/CD deployment, check if the project has an existing CI/CD setup. If no CI/CD configuration is found, it is not yet set up.

Next Steps for CI/CD Setup

1. Select a CI/CD Tool: Choose a CI/CD tool that suits your needs. Options include GitHub Actions, GitLab CI, Jenkins, CircleCI, etc.

2. Create Configuration Files: Depending on the chosen tool, create configuration files like .github/workflows/ci.yml, .gitlab-ci.yml, or Jenkinsfile.

3. Integrate Docker: Make sure the chosen CI/CD tool can build and run Docker containers as part of your pipeline. This usually involves setting up a runner that can execute Docker commands.

Step 2: Dockerfile Example

A Dockerfile can be used to create a container image for building and deploying your Go application.

# syntax=docker/dockerfile:1

FROM golang:1.23.3-alpine3.20 AS build

WORKDIR /go/src/github.com/docker/cli
COPY . .

RUN GO111MODULE=on CGO_ENABLED=0 go build -o myapp ./...

# Production image
FROM alpine:latest
COPY --from=build /go/src/github.com/docker/cli/myapp /usr/local/bin/myapp

ENTRYPOINT ["/usr/local/bin/myapp"]

Step 3: Docker Compose Configuration

The following docker-compose.yml can be used to orchestrate multiple services, including dependencies like databases.

version: "2"
services:
  server:
    build:
      context: .
      dockerfile: server.Dockerfile
    ports:
      - "8080"
      - "4443:4443"
    entrypoint: /usr/bin/env sh
    command: -c "./migrations/migrate.sh && notary-server -config=fixtures/server-config.json"
    depends_on:
      - mysql
      - signer

  signer:
    build:
      context: .
      dockerfile: signer.Dockerfile
    entrypoint: /usr/bin/env sh
    command: -c "./migrations/migrate.sh && notary-signer -config=fixtures/signer-config.json"
    depends_on:
      - mysql

  mysql:
    image: mariadb:10.4
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD="true"
    volumes:
      - ./notarysql/mysql-initdb.d:/docker-entrypoint-initdb.d
      - notary_data:/var/lib/mysql

volumes:
  notary_data:
    external: false

Step 4: Define Makefile Targets

A Makefile can streamline common tasks associated with the CI/CD process.

# Makefile

.PHONY: all build test clean

all: build

build:
    docker-compose build

test:
    docker-compose up --abort-on-container-exit

clean:
    docker-compose down

Step 5: Running the Pipeline

Each CI/CD tool has its specific commands to trigger builds. However, the general approach will include:

• Fetching the latest code from the repository.
• Building Docker images using the defined Dockerfile.
• Running tests using the specified services in docker-compose.yml.

Ensure the CI/CD runner has Docker installed and can execute commands such as docker build and docker-compose up.

Step 6: Automate Deployment

Once the tests pass successfully, automate the deployment of the container image to a production or staging environment using commands like docker compose up -d for deployment in defined environments.

Conclusion

The CI/CD process is essential for modern software development, particularly with Docker and Go applications. Ensure to customize the examples to fit the specifics of your environment and project requirements.

This information is derived from the project files associated with the Docker CLI. For further reading, consult the official Docker and Go documentation.