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--- ubuntu:docker:basic_usage_of_docker [2019/11/27 00:54] – created peter
+++ ubuntu:docker:basic_usage_of_docker [2020/04/16 08:04] (current) – removed peter
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-====== Ubuntu - Docker - Basic Usage of Docker ======
-Commonly used options of the docker command. E.g. how to download a docker image, build a container and how to access the container.
-To create a new container, you should start by choosing a base image with the OS, e.g. ubuntu or centos or another. You can search for a base image with the docker search command:
-<code bash>
-docker search ubuntu
-</code>
-This command will show you all ubuntu images. You can try by yourself docker search centos etc.
-Download the base image to our server, use the command:
-<code bash>
-docker pull ubuntu
-</code>
-The docker pull imagename command will download an image to your server from docker registry/DockerHub.
-Now you can see all downloaded images by using the command:
-<code bash>
-docker images
-</code>
-The Ubuntu image was downloaded from DockerHub/Docker Registry. The next step is to create a container from that image.
-To create the container, you can use docker create or docker run.
-<code bash>
-docker create ubuntu:16.04
-</code>
-**docker create** command will create a new container but not start it. So now you can use run command:
-<code bash>
-docker run -i -t ubuntu:16.04 /bin/bash
-</code>
-This command will create and run a container based in ubuntu 16.04 image and run a command /bin/bash inside the container, you will be automatically inside the container after running the command.
-The container will stop when you leave it with the command exit.  If you like to have a container that is running in the background, you just need to add the -d option in the command.
-<code bash>
-docker run -i -t -d ubuntu:16.04 /bin/sh -c "while true; do echo hello world; sleep 1; done"
-/bin/sh -c "while true; do echo hello world; sleep 1; done" this is bash script to echo "hello word" forever.
-</code>
-Now you can see the container running in the background by using command:
-<code bash>
-docker ps
-</code>
-or if you want to see the logs result from that bash command you can use the command:
-<code bash>
-docker logs NAMES/ContainerID
-</code>
-How can I access the shell of container that runs in the background mode? This command will connect you to the shell of the container:
-<code bash>
-docker exec -i -t NAMES/ContainerID /bin/bash
-</code>
-You can see the hostname and the container ID are equal, this means that you are inside of the container shell. When you type `exit` on that shell you will leave that shell but the container is still running.
-Another command that you will use often is:
-<code bash>
-docker stop NAME/ContainerID
-</code>
-This will stop the container without deleting it, so you can start it again with the command:
-<code bash>
-docker start NAME/ContainerID
-</code>
-If you like to remove the container, stop it first and then remove it with the command:
-<code bash>
-docker rm NAME/ContainerID
-</code>
-This is just a short introduction on the installation and basic usage of Docker on Ubuntu, you can find the detailed Docker documentation page here.
-An in-depth introduction to Docker is available in this Howtoforge tutorial series: https://www.howtoforge.com/tutorial/how-to-use-docker-introduction/
-----
-===== Conclusion =====
-Docker is an open source container virtualization platform which helps developers to deploy their applications and system administrators to manage applications in a safe virtual container environment. Docker runs on the Intel / AMD 64-bit architecture and the kernel should be higher 3.10 version. With Docker, you can build and run your application inside a container and then move your containers to other machines running docker without any worries.
-----
-===== References =====
-https://www.howtoforge.com/tutorial/docker-installation-and-usage-on-ubuntu-16.04/