Introduction
Docker is an application that makes it simple and easy to run application processes in a container, which are like virtual machines, only more portable, more resource-friendly, and more dependent on the host operating system. For a detailed introduction to the different components of a Docker container, check out The Docker Ecosystem: An Introduction to Common Components.
There are two methods for installing Docker on CentOS 7. One method involves installing it on an existing installation of the operating system. The other involves spinning up a server with a tool called Docker Machine that auto-installs Docker on it.
In this tutorial, you'll learn how to install and use it on an existing installation of CentOS 7.
Prerequisites
64-bit CentOS 7 VPS or Dedicated
Non-root user with sudo privileges.
Note: Docker requires a 64-bit version of CentOS 7 as well as a kernel version equal to or greater than 3.10.
All the commands in this tutorial should be run as a non-root user. If root access is required for the command, it will be preceded by sudo.
Step 1 — Installing Docker
The Docker installation package available in the official CentOS 7 repository may not be the latest version. To get the latest and greatest version, install Docker from the official Docker repository. This section shows you how to do just that.
But first, let's update the package database:
Now run this command. It will add the official Docker repository, download the latest version of Docker, and install it:
After installation has completed, start the Docker daemon:
Verify that it's running:
The output should be similar to the following, showing that the service is active and running:
Lastly, make sure it starts at every server reboot:
Installing Docker now gives you not just the Docker service (daemon) but also the docker command line utility, or the Docker client. We'll explore how to use the docker command later in this tutorial.
Step 2 — Executing Docker Command Without Sudo (Optional)
By default, running the docker command requires root privileges — that is, you have to prefix the command with sudo. It can also be run by a user in the docker group, which is automatically created during the installation of Docker. If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, you'll get an output like this:
If you want to avoid typing sudo whenever you run the docker command, add your username to the docker group:
You will need to log out of the server and back in as the same user to enable this change.
If you need to add a user to the docker group that you're not logged in as, declare that username explicitly using:
The rest of this article assumes you are running the docker command as a user in the docker user group. If you choose not to, please prepend the commands with sudo.
Step 3 — Using the Docker Command
With Docker installed and working, now's the time to become familiar with the command line utility. Using docker consists of passing it a chain of options and subcommands followed by arguments. The syntax takes this form:
To view all available subcommands, type:
As of Docker 1.11.1, the complete list of available subcommands includes:
To view the switches available to a specific command, type:
To view system-wide information, use:
Step 4 — Working with Docker Images
Docker containers are run from Docker images. By default, it pulls these images from Docker Hub, a Docker registry managed by Docker, the company behind the Docker project. Anybody can build and host their Docker images on Docker Hub, so most applications and Linux distributions you'll need to run Docker containers have images that are hosted on Docker Hub.
To check whether you can access and download images from Docker Hub, type:
The output, which should include the following, should indicate that Docker in working correctly:
You can search for images available on Docker Hub by using the docker command with the search subcommand. For example, to search for the CentOS image, type:
The script will crawl Docker Hub and return a listing of all images whose name match the search string. In this case, the output will be similar to this:
In the OFFICIAL column, OK indicates an image built and supported by the company behind the project. Once you've identifed the image that you would like to use, you can download it to your computer using the pull subcommand, like so:
After an image has been downloaded, you may then run a container using the downloaded image with the run subcommand. If an image has not been downloaded when docker is executed with the run subcommand, the Docker client will first download the image, then run a container using it:
To see the images that have been downloaded to your computer, type:
The output should look similar to the following:
As you'll see later in this tutorial, images that you use to run containers can be modified and used to generate new images, which may then be uploaded (pushed is the technical term) to Docker Hub or other Docker registries.
Step 5 — Running a Docker Container
The hello-world container you ran in the previous step is an example of a container that runs and exits, after emitting a test message. Containers, however, can be much more useful than that, and they can be interactive. After all, they are similar to virtual machines, only more resource-friendly.
As an example, let's run a container using the latest image of CentOS. The combination of the -i and -t switches gives you interactive shell access into the container:
Your command prompt should change to reflect the fact that you're now working inside the container and should take this form:
Important: Note the container id in the command prompt. In the above example, it is 59839a1b7de2.
Now you may run any command inside the container. For example, let's install MariaDB server in the running container. No need to prefix any command with sudo, because you're operating inside the container with root privileges:
Step 6 — Committing Changes in a Container to a Docker Image
When you start up a Docker image, you can create, modify, and delete files just like you can with a virtual machine. The changes that you make will only apply to that container. You can start and stop it, but once you destroy it with the docker rm command, the changes will be lost for good.
This section shows you how to save the state of a container as a new Docker image.
After installing MariaDB server inside the CentOS container, you now have a container running off an image, but the container is different from the image you used to create it.
To save the state of the container as a new image, first exit from it:
Then commit the changes to a new Docker image instance using the following command. The -m switch is for the commit message that helps you and others know what changes you made, while -a is used to specify the author. The container ID is the one you noted earlier in the tutorial when you started the interactive docker session. Unless you created additional repositories on Docker Hub, the repository is usually your Docker Hub username:
For example:
Note: When you commit an image, the new image is saved locally, that is, on your computer. Later in this tutorial, you'll learn how to push an image to a Docker registry like Docker Hub so that it may be assessed and used by you and others.
After that operation has completed, listing the Docker images now on your computer should show the new image, as well as the old one that it was derived from:
The output should be of this sort:
In the above example, centos-mariadb is the new image, which was derived from the existing CentOS image from Docker Hub. The size difference reflects the changes that were made. And in this example, the change was that MariaDB server was installed. So next time you need to run a container using CentOS with MariaDB server pre-installed, you can just use the new image. Images may also be built from what's called a Dockerfile. But that's a very involved process that's well outside the scope of this article.
Step 7 — Listing Docker Containers
After using Docker for a while, you'll have many active (running) and inactive containers on your computer. To view the active ones, use:
You will see output similar to the following:
To view all containers — active and inactive, pass it the -a switch:
To view the latest container you created, pass it the -l switch:
Stopping a running or active container is as simple as typing:
The container-id can be found in the output from the docker ps command.
Step 8 — Pushing Docker Images to a Docker Repository
The next logical step after creating a new image from an existing image is to share it with a select few of your friends, the whole world on Docker Hub, or other Docker registry that you have access to. To push an image to Docker Hub or any other Docker registry, you must have an account there.
This section shows you how to push a Docker image to Docker Hub.
To create an account on Docker Hub, register at Docker Hub. Afterwards, to push your image, first log into Docker Hub. You'll be prompted to authenticate:
If you specified the correct password, authentication should succeed. Then you may push your own image using:
It will take sometime to complete, and when completed, the output will be of this sort:
After pushing an image to a registry, it should be listed on your account's dashboard, like that show in the image below.
If a push attempt results in an error of this sort, then you likely did not log in:
Log in, then repeat the push attempt.
Conclusion
There's a whole lot more to Docker than has been given in this article, but this should be enough to getting you started working with it on CentOS 7. Like most open source projects, Docker is built from a fast-developing codebase, so make a habit of visiting the project's blog page for the latest information.
Docker is an application that makes it simple and easy to run application processes in a container, which are like virtual machines, only more portable, more resource-friendly, and more dependent on the host operating system. For a detailed introduction to the different components of a Docker container, check out The Docker Ecosystem: An Introduction to Common Components.
There are two methods for installing Docker on CentOS 7. One method involves installing it on an existing installation of the operating system. The other involves spinning up a server with a tool called Docker Machine that auto-installs Docker on it.
In this tutorial, you'll learn how to install and use it on an existing installation of CentOS 7.
Prerequisites
64-bit CentOS 7 VPS or Dedicated
Non-root user with sudo privileges.
Note: Docker requires a 64-bit version of CentOS 7 as well as a kernel version equal to or greater than 3.10.
All the commands in this tutorial should be run as a non-root user. If root access is required for the command, it will be preceded by sudo.
Step 1 — Installing Docker
The Docker installation package available in the official CentOS 7 repository may not be the latest version. To get the latest and greatest version, install Docker from the official Docker repository. This section shows you how to do just that.
But first, let's update the package database:
Code: Select all
sudo yum check-updateCode: Select all
curl -fsSL https://get.docker.com/ | shCode: Select all
sudo systemctl start dockerCode: Select all
sudo systemctl status dockerCode: Select all
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2016-05-01 06:53:52 CDT; 1 weeks 3 days ago
Docs: https://docs.docker.com
Main PID: 749 (docker)Code: Select all
sudo systemctl enable dockerStep 2 — Executing Docker Command Without Sudo (Optional)
By default, running the docker command requires root privileges — that is, you have to prefix the command with sudo. It can also be run by a user in the docker group, which is automatically created during the installation of Docker. If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, you'll get an output like this:
Code: Select all
docker: Cannot connect to the Docker daemon. Is the docker daemon running on this host?.
See 'docker run --help'.Code: Select all
sudo usermod -aG docker $(whoami)If you need to add a user to the docker group that you're not logged in as, declare that username explicitly using:
Code: Select all
sudo usermod -aG docker usernameStep 3 — Using the Docker Command
With Docker installed and working, now's the time to become familiar with the command line utility. Using docker consists of passing it a chain of options and subcommands followed by arguments. The syntax takes this form:
Code: Select all
docker [option] [command] [arguments]Code: Select all
dockerCode: Select all
attach Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders between a container and the local filesystem
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Export a container's filesystem as a tar archive
history Show the history of an image
images List images
import Import the contents from a tarball to create a filesystem image
info Display system-wide information
inspect Return low-level information on a container or image
kill Kill a running container
load Load an image from a tar archive or STDIN
login Log in to a Docker registry
logout Log out from a Docker registry
logs Fetch the logs of a container
network Manage Docker networks
pause Pause all processes within a container
port List port mappings or a specific mapping for the CONTAINER
ps List containers
pull Pull an image or a repository from a registry
push Push an image or a repository to a registry
rename Rename a container
restart Restart a container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save one or more images to a tar archive
search Search the Docker Hub for images
start Start one or more stopped containers
stats Display a live stream of container(s) resource usage statistics
stop Stop a running container
tag Tag an image into a repository
top Display the running processes of a container
unpause Unpause all processes within a container
update Update configuration of one or more containers
version Show the Docker version information
volume Manage Docker volumes
wait Block until a container stops, then print its exit codeCode: Select all
docker docker-subcommand --helpCode: Select all
docker infoDocker containers are run from Docker images. By default, it pulls these images from Docker Hub, a Docker registry managed by Docker, the company behind the Docker project. Anybody can build and host their Docker images on Docker Hub, so most applications and Linux distributions you'll need to run Docker containers have images that are hosted on Docker Hub.
To check whether you can access and download images from Docker Hub, type:
Code: Select all
docker run hello-worldCode: Select all
Hello from Docker.
This message shows that your installation appears to be working correctly.
...Code: Select all
docker search centosCode: Select all
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
centos The official build of CentOS. 2224 [OK]
jdeathe/centos-ssh CentOS-6 6.7 x86_64 / CentOS-7 7.2.1511 x8... 22 [OK]
jdeathe/centos-ssh-apache-php CentOS-6 6.7 x86_64 / Apache / PHP / PHP M... 17 [OK]
million12/centos-supervisor Base CentOS-7 with supervisord launcher, h... 11 [OK]
nimmis/java-centos This is docker images of CentOS 7 with dif... 10 [OK]
torusware/speedus-centos Always updated official CentOS docker imag... 8 [OK]
nickistre/centos-lamp LAMP on centos setup 3 [OK]
...Code: Select all
docker pull centosCode: Select all
docker run centosCode: Select all
docker imagesCode: Select all
REPOSITORY TAG IMAGE ID CREATED SIZE
centos latest 778a53015523 5 weeks ago 196.7 MB
hello-world latest 94df4f0ce8a4 2 weeks ago 967 BStep 5 — Running a Docker Container
The hello-world container you ran in the previous step is an example of a container that runs and exits, after emitting a test message. Containers, however, can be much more useful than that, and they can be interactive. After all, they are similar to virtual machines, only more resource-friendly.
As an example, let's run a container using the latest image of CentOS. The combination of the -i and -t switches gives you interactive shell access into the container:
Code: Select all
docker run -it centosCode: Select all
[root@59839a1b7de2 /]#Now you may run any command inside the container. For example, let's install MariaDB server in the running container. No need to prefix any command with sudo, because you're operating inside the container with root privileges:
Code: Select all
yum install mariadb-serverWhen you start up a Docker image, you can create, modify, and delete files just like you can with a virtual machine. The changes that you make will only apply to that container. You can start and stop it, but once you destroy it with the docker rm command, the changes will be lost for good.
This section shows you how to save the state of a container as a new Docker image.
After installing MariaDB server inside the CentOS container, you now have a container running off an image, but the container is different from the image you used to create it.
To save the state of the container as a new image, first exit from it:
Code: Select all
exitCode: Select all
docker commit -m "What did you do to the image" -a "Author Name" container-id repository/new_image_nameCode: Select all
docker commit -m "added mariadb-server" -a "Sunday Ogwu-Chinuwa" 59839a1b7de2 finid/centos-mariadbAfter that operation has completed, listing the Docker images now on your computer should show the new image, as well as the old one that it was derived from:
Code: Select all
docker imagesCode: Select all
REPOSITORY TAG IMAGE ID CREATED SIZE
finid/centos-mariadb latest 23390430ec73 6 seconds ago 424.6 MB
centos latest 778a53015523 5 weeks ago 196.7 MB
hello-world latest 94df4f0ce8a4 2 weeks ago 967 BStep 7 — Listing Docker Containers
After using Docker for a while, you'll have many active (running) and inactive containers on your computer. To view the active ones, use:
Code: Select all
docker psCode: Select all
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f7c79cc556dd centos "/bin/bash" 3 hours ago Up 3 hours silly_spenceCode: Select all
docker ps -aCode: Select all
docker ps -lCode: Select all
docker stop container-idStep 8 — Pushing Docker Images to a Docker Repository
The next logical step after creating a new image from an existing image is to share it with a select few of your friends, the whole world on Docker Hub, or other Docker registry that you have access to. To push an image to Docker Hub or any other Docker registry, you must have an account there.
This section shows you how to push a Docker image to Docker Hub.
To create an account on Docker Hub, register at Docker Hub. Afterwards, to push your image, first log into Docker Hub. You'll be prompted to authenticate:
Code: Select all
docker login -u docker-registry-usernameCode: Select all
docker push docker-registry-username/docker-image-nameCode: Select all
The push refers to a repository [docker.io/finid/centos-mariadb]
670194edfaf5: Pushed
5f70bf18a086: Mounted from library/centos
6a6c96337be1: Mounted from library/centos
...
If a push attempt results in an error of this sort, then you likely did not log in:
Code: Select all
The push refers to a repository [docker.io/finid/centos-mariadb]
e3fbbfb44187: Preparing
5f70bf18a086: Preparing
a3b5c80a4eba: Preparing
7f18b442972b: Preparing
3ce512daaf78: Preparing
7aae4540b42d: Waiting
unauthorized: authentication requiredConclusion
There's a whole lot more to Docker than has been given in this article, but this should be enough to getting you started working with it on CentOS 7. Like most open source projects, Docker is built from a fast-developing codebase, so make a habit of visiting the project's blog page for the latest information.
