Docker Command

Build docker image

To build your Dockerfile into an Image and upload it to DockerHub, you can follow the steps below:

1. Create a Docker Image: In the directory where your Dockerfile is located, execute the following command to create a Docker image:

    docker build -t dockerhub_username/image_name:your_tag .
   

   • dockerhub_username: Your username on DockerHub.
   • image_name: The name you want to give to your image.

   • your_tag: Tag version, e.g., latest or v1.0 etc.

     Example:

     docker build -t myusername/myphpimage:latest .
     

2. Log into DockerHub: If you're not yet logged into Docker CLI, execute the following command:

    docker login
   

   Then enter your DockerHub account and password.

3. Upload Docker Image to DockerHub: Use the following command to push your Docker image to DockerHub:

    docker push dockerhub_username/image_name:your_tag
   

   If you use the previous example, the command will look like this:

    docker push myusername/myphpimage:latest
   

4. Check DockerHub: After the upload is complete, you can log into the DockerHub web interface and navigate to your repository to check if the newly uploaded image exists.

Please note:

• Make sure your Docker daemon is already running locally.
• Before uploading, please test your Docker image to ensure it works properly.

Add latest tag to a docker image

When you create a Docker image without specifying a tag, Docker automatically labels it as latest. However, if you specify another tag, Docker will not automatically add the latest tag.

If you want to add both a specific tag and the latest tag to the same image, you need to perform two tagging and two push operations. Here are the detailed steps:

1. Create the image:

    docker build -t dockerhub_username/image_name:specific_tag .
   

   For example:

    docker build -t myusername/myphpimage:v1.0 .
   

2. Tag the image as latest:

    docker tag dockerhub_username/image_name:specific_tag dockerhub_username/image_name:latest
   

   Using the previous example:

    docker tag myusername/myphpimage:v1.0 myusername/myphpimage:latest
   

3. Push the image with a specific tag to DockerHub:

    docker push dockerhub_username/image_name:specific_tag
   

   For example:

    docker push myusername/myphpimage:v1.0
   

4. Push the image with the latest tag to DockerHub:

    docker push dockerhub_username/image_name:latest
   

   For example:

    docker push myusername/myphpimage:latest
   

After completing these steps, your image will have two tags: specific_tag and latest.

Clean up docker

If you're looking for ways to clean up your Docker environment, below are some commands that can help.

1. Stop all running containers $(docker container ls -a -q) will return all container IDs (including those that have been stopped)

    docker stop $(docker container ls -a -q)
   

2. Remove unused resources

    docker system prune
   

   This will remove unused networks, and all stopped containers, all volumes not used by at least one container, and all images without at least one container associated to them. When you run this command, Docker will ask for your confirmation whether or not to delete those resources. If you want not to be asked and you know it is safe to delete, you can add -f for force deletion.

3. Remove all Docker images $(docker images -a -q) will return all image IDs. Please be careful as this may remove images that you are using or planning to use. If you're unsure, it's better not to use this command.

    docker rmi $(docker images -a -q)
   

   Please note the docker system prune command requires Docker 17.06.1-ce or newer. Refer to this log to make sure that your system is up to date! Also, be careful while using these commands as they might delete resources that you might need now or in the future.