#CNET DOCKSHELF SERIES#Creating a DockerfileĪ Dockerfile is a text file that has a series of instructions to build an image. Ubuntu Server 14.04 with Docker installed on your system. #CNET DOCKSHELF HOW TO#In this tutorial, I will explain how to create a Dockerfile, install the required Apache packages, add the necessary content and then build image. Build the Docker image using Dockerfile with the web site included.Interactively launch a BASH shell under the Ubuntu Base image, install Apache and its dependencies, and then save the image.You can build the Docker image using one of the following two options: It helps us to avoid issuing the command everytime while running container. A Dockerfile is a text document that contains all the commands a user could call on the command line to build an image.Ī Dockerfile consists of various commands and arguments listed successively to automatically perform actions on a base image in order to create a new one. Docker can build images automatically by reading the instructions from a Dockerfile. View Plansĭocker allows you to build containers using a Dockerfile. The -filter, -f option allows you to filter the output based on certain criteria.Need Hosting? Try ours, it's fast, reliable and feature loaded with support you can depend on. There is also an option to list only the latest created container -latest, -l which is same as -n 1: docker container ls -l For example, to view the latest two created containers, you would run: docker container ls -n 2 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES The -last, -n option tells the command to display n last created containers, including all states. Use the -s, -size option to view the size of the containers: docker container ls -sĮach line will include a column named SIZE that shows the container size: CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES SIZEĬ8bded53da86 postgres "docker-entrypoint.s…" 2 hours ago Up 2 hours 5432/tcp pg 63B (virtual 394MB)ĥ71c3a115fcf redis "docker-entrypoint.s…" 4 hours ago Up 4 hours 6379/tcp cache 0B (virtual 98.2MB)Ġ5ef6d8680ba nginx "nginx -g 'daemon of…" 2 hours ago Up 2 hours 80/tcp web 2B (virtual 126MB) For example, to print only the containers’ names and status, including the header, you would run: docker container ls -format 'table ' NAMES STATUS The -format allows you to format the output using a Go template. To only display the containers’ IDs pass the -q, -quiet option: docker container ls -q c8bded53da86 Use the -no-trunc option to disable truncation: docker container ls -no-trunc The -a, -all option tells docker container ls to print a list of all containers: docker container ls -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESī28cbaa91f15 couchbase "/entrypoint.sh couc…" 5 hours ago Exited (0) 3 hours ago dbīy default, columns with a length exceeding a specified limit are truncated. If there are no running containers, only the header line is displayed. Ports – The container’s published ports.Created – The creation time of the container.Command – The command that is executed when starting the container.Image – The Docker image that is used to create the container.Container ID – A unique alphanumeric string that identifies each container.The output will look something like this: CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĬ8bded53da86 postgres "docker-entrypoint.s…" 2 hours ago Up 2 hours 5432/tcp pgĥ71c3a115fcf redis "docker-entrypoint.s…" 4 hours ago Up 4 hours 6379/tcp cacheĠ5ef6d8680ba nginx "nginx -g 'daemon of…" 2 hours ago Up 2 hours 80/tcp webĮach line of the output includes the following columns: To list the running containers, execute the docker container ls command without any option: docker container ls The command above is still supported in newer Docker versions where the ps command is an alias to container ls. Older Docker versions before 1.13 are using a different command to list the containers: docker ps The Docker command for listing containers takes the following form: docker container ls In this article, we’ll explain how to list Docker containers. It is the de-facto standard for container deployment, and it is an essential tool for DevOps engineers and their continuous integration and delivery pipeline. Docker is a containerization platform that allows you to quickly build, test, and deploy applications as portable, self-sufficient containers that can run virtually anywhere.
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