![]() ![]() List All Docker Images Step 2: Run the Container and Access Apache from LANĥ. ![]() After the image has been created by Docker, you can list all available images and identify your image by issuing the following command: # docker images The last thing we need to do is to start creating the image by issuing the below command, which will locally create a new Docker image named ubuntu-apache based on the Dockerfile created earlier, as shown in this example: # docker build -t ubuntu-apache /var/docker/ubuntu/apache/Ĥ. The last line instructs the container to run Apache service in the foreground after the container is started.ģ. The EXPOSE line will instruct the Docker container to listen on port 80, but the port will be not available to outside. Next two RUN lines will be executed in the container when building the image and will install Apache daemon and echo some text into the default apache web page. On the second line, we’ve added the name and email of the image creator. If no tag is submitted, say 14:10 for example, the latest image from Docker Hub is used. The first line tells us that we are building from an Ubuntu image. Now, let’s go through the file instructions: RUN echo “Hello Apache server on Ubuntu Docker” > /var/www/html/index.html Next, start editing the file with the following instructions: # vi /var/docker/ubuntu/apache/Dockerfile # touch /var/docker/ubuntu/apache/DockerfileĢ. Make an empty directory somewhere in /var partition where we will create the file with the instructions that will be used to build the newly Docker image. First, let’s create some kind of Dockerfile repositories in order to reuse files in the future to create other images. Step 1: Creating or Writing Dockerfile Repositoryġ. ADD = Copy resources (files, directories, or files from URLs).ENV = Set container environment variables.The container ports are not reachable from the host by default. EXPOSE = Instructs the container to listen on network ports when running.ENTRYPOINT = Same as CMD but used as the main command for the image.Use only one CMD instruction in a Dockerfile. CMD = Run any command when the Docker image is started.RUN = This instruction can be used on multiple lines and runs any commands after a Docker image has been created.Use a tag to specify the exact image from which you are building: Instructs Docker to pull the base image from which you are building the new image. FROM = Mandatory as the first instruction in a Docker file. ![]() The following instructions are the most used, some of them being mandatory: ![]()
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