What is the difference between docker and vmware
VMware
A slave operating system created based on the host machine operating system.
If you need several mutually isolated applications, you need to start several virtual machines, which will consume a lot of CPU and memory.
Docker
The docker daemon replaces the slave operating system in VMware. It is a background process running on the operating system and used to manage docker containers.
The docker daemon can communicate directly with the main operating system to allocate resources to each docker container. You can also isolate containers from the main operating system and isolate individual containers from each other.
Docker creates a docker engine on the host operating system and calls hardware resources directly on the host operating system instead of virtualizing the operating system and hardware resources, so the operation speed is fast.
Recommended tutorial: docker tutorial
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The steps to update a Docker image are as follows: Pull the latest image tag New image Delete the old image for a specific tag (optional) Restart the container (if needed)

How to use Docker Desktop? Docker Desktop is a tool for running Docker containers on local machines. The steps to use include: 1. Install Docker Desktop; 2. Start Docker Desktop; 3. Create Docker image (using Dockerfile); 4. Build Docker image (using docker build); 5. Run Docker container (using docker run).

Steps to create a Docker image: Write a Dockerfile that contains the build instructions. Build the image in the terminal, using the docker build command. Tag the image and assign names and tags using the docker tag command.

Four ways to exit Docker container: Use Ctrl D in the container terminal Enter exit command in the container terminal Use docker stop <container_name> Command Use docker kill <container_name> command in the host terminal (force exit)

You can query the Docker container name by following the steps: List all containers (docker ps). Filter the container list (using the grep command). Gets the container name (located in the "NAMES" column).

Troubleshooting steps for failed Docker image build: Check Dockerfile syntax and dependency version. Check if the build context contains the required source code and dependencies. View the build log for error details. Use the --target option to build a hierarchical phase to identify failure points. Make sure to use the latest version of Docker engine. Build the image with --t [image-name]:debug mode to debug the problem. Check disk space and make sure it is sufficient. Disable SELinux to prevent interference with the build process. Ask community platforms for help, provide Dockerfiles and build log descriptions for more specific suggestions.

Methods for copying files to external hosts in Docker: Use the docker cp command: Execute docker cp [Options] <Container Path> <Host Path>. Using data volumes: Create a directory on the host, and use the -v parameter to mount the directory into the container when creating the container to achieve bidirectional file synchronization.

To save the image in Docker, you can use the docker commit command to create a new image, containing the current state of the specified container, syntax: docker commit [Options] Container ID Image name. To save the image to the repository, you can use the docker push command, syntax: docker push image name [: tag]. To import saved images, you can use the docker pull command, syntax: docker pull image name [: tag].
