Linux and Docker: How to perform container version management and release management?

Linux and Docker: How to perform container version management and release management?

With the development of cloud computing technology, containerization technology has increasingly become the preferred solution for developing and deploying applications. Among containerization technologies, Linux and Docker are the two most commonly used and popular tools. The Container technology that comes with Linux has matured, and Docker provides a simpler and easier management and deployment method for containers. This article will introduce how to use Linux and Docker for container version management and release management.

1. Container version management

In the development and deployment process, container version management is a very important part. When applications change, new container versions need to be created and upgraded and rolled back without affecting existing programs. The following is an example of using Docker for container version management:

1. Create a new container version

   docker build -t myapp:v1 .

2. View all container versions

   docker images

3. Start a container

   docker run -d --name myapp myapp:v1

4. Upgrade the container version

   docker build -t myapp:v2 .
   docker stop myapp
   docker rm myapp
   docker run -d --name myapp myapp:v2

5. Roll back to the previous container version

   docker stop myapp
   docker rm myapp
   docker run -d --name myapp myapp:v1

Through the above example, we can see how to create, view, upgrade and rollback the version of the container.

2. Container Release Management

Container release management includes container deployment, configuration and expansion. In Docker, container release management can be carried out through Docker Compose. The following is an example of using Docker Compose for container release management:

1. Create a docker-compose.yml file:

   version: '3'
   services:
     web:
    image: nginx:latest
    ports:
      - "80:80"
    volumes:
      - nginx.conf:/etc/nginx/nginx.conf
   volumes:
     nginx.conf:
    external: true

2. Create a nginx.conf file, used to configure Nginx:

   server {
    listen       80;
    server_name  localhost;
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }
   }

3. Start the container

   docker-compose up -d

Through the above example, we can see how to use Docker Compose To perform container deployment and configuration management.

3. Automation of container version and release management

In order to manage container version and release more efficiently, we can also use some automation tools, such as Jenkins and GitLab, to achieve the continuity of containers. Integration and continuous deployment. The following is an example of using Jenkins and GitLab for container version and release management:

1. Create a new warehouse on GitLab to store application code and Dockerfile.
2. Create a new task in Jenkins and pull the code and Dockerfile in GitLab into the working directory of Jenkins.
3. Configure a Pipeline script in Jenkins to automatically build, test, and publish container applications.

Through the above examples, we can automate container version and release management.

Summary:

Containerization technology provides a more convenient and flexible way to develop and deploy applications. As one of the most popular tools in containerization technology, Linux and Docker can provide powerful container version and release management functions. Through the methods and examples introduced in this article, I believe readers will have a deeper understanding of how to perform container version management and release management.

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