Let’s talk about how to start a container under docker

Docker is a lightweight virtualization solution that encapsulates an application and all its dependencies into a separate container. The use of Docker makes application deployment and management easier and more efficient. This article will introduce the basic concepts of Docker and how to start a container under Docker.

1. Basic concepts of Docker

1. Image: Docker image is a lightweight, portable container running environment. You can think of a Docker image as a packaged software or application.
2. Container: Docker container is an instantiation of an image. Each container is an independent and isolated environment. Containers can run, stop, restart, delete, etc.
3. Warehouse (Repository): Docker warehouse is a place where Docker images are centrally stored and distributed. Docker images can be uploaded and downloaded to the Docker warehouse.

2. Steps for Docker to start a container

1. Search for the required image: Use the docker search command to find the required image, for example: docker search nginx, which will return nginx. All images of keywords.
2. Download the required image: Use the docker pull command to download the required image, for example: docker pull nginx.
3. Start a new container: Use the docker run command to start a new container and specify the image and container name to be used, for example: docker run --name mynginx nginx.
4. Access the container: Use the docker exec command to enter the container. For example: docker exec -it mynginx /bin/bash will enter the command line mode of the mynginx container.

3. Common Docker commands

1. docker ps: View the currently running containers.
2. docker images: View the list of locally downloaded images.
3. docker stop Container ID/name: Stop a running container.
4. docker rm container ID/name: Delete a stopped container.
5. docker rmi Image ID/name: Delete one or more images that have been downloaded locally.
6. docker logs Container ID/name: View the container’s logs.

4. Avoid Docker container errors

1. Avoid frequent changes to Docker containers: changes to the container require re-building and redeployment, so it is recommended to do this during application development Make changes during the testing phase and deploy and test images during the production phase of the application.
2. Avoid saving state information in containers: You should avoid saving state information in containers because Docker containers are ephemeral instances.
3. Avoid using outdated images: Images should be updated frequently to ensure that the image used is the latest version.

In summary, the use of Docker is so convenient and efficient because it can help us manage and deploy applications. With Docker, we can quickly deploy and run multiple applications and deploy them to different environments, whether local or cloud.

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