On the other hand, Ubuntu 20.04 feels more stable and easy to use, and as a result, users consider the operations running more smoothly, compared to some previous versions. Still, some users have issues while installing certain apps and software. Such is the case with Docker Compose.

In the following tutorial, we will show you how to install Docker Compose on Ubuntu 20.04 server.

Prerequisites

• A fresh Ubuntu 20.04 VPS.
• Access to the root user account (or access to an admin account with root privileges)

Step 1: Log in to the Server & Update the Server OS Packages

First, log in to your Ubuntu 20.04 server via SSH as the root user:

ssh root@IP_Address -p Port_number

You will need to replace ‘IP_Address‘ and ‘Port_number‘ with your server’s respective IP address and SSH port number. Additionally, replace ‘root‘ with the username of the admin account if necessary.

Before starting, you have to make sure that all Ubuntu 20.04 OS packages installed on the server are up to date. You can do this by running the following commands:

apt-get update -y

Step 2: Install  docker-compose on your server

By default, Docker Compose is available in the Ubuntu 20.04 default repository. You can install it with the following command:

apt-get install docker-compose

Once the Docker Compose is installed, verify the installed version with the following command:

docker-compose --version

You should get the following output:

docker-compose version 1.25.0, build unknown

This option will not guarantee that you downloading the latest docker-compose version.

On the GitHub repository, you will get the updates of Docker Compose, which might not be available on the standard Ubuntu repository. At the time of this writing this tutorial, the most current stable version is 1.29.2.

curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

This command saves the file in: /usr/local/bin directory, under the name docker-compose.

Next, you need to change the file permission, and making the downloaded file executable with the following command:

chmod +x /usr/local/bin/docker-compose

Once Docker Compose is installed, verify the installed version with the following command:

docker-compose --version

You should get the following output:

docker-compose version 1.29.2, build 5becea4c

Step 3: Test Docker Compose with Sample Container

Create a new directory for your sample container example:

mkdir test

Change directory that you just created:

cd test

From there, create a YAML configuration file:

nano docker-compose.yaml

And copy the following configuration into docker-compose.yaml file:

version: '3.3'
services:
   hello-world:
      image:
         hello-world:latest

Next, run the following command to pull the hello-world image on your system.

docker-compose up

The output should be similar to this:

Creating network "root_default" with the default driver
Pulling hello-world (hello-world:latest)...
latest: Pulling from library/hello-world
2db29710123e: Pull complete
Digest: sha256:9ade9cc2e26189a19c2e8854b9c8f1e14829b51c55a630ee675a5a9540ef6ccf
Status: Downloaded newer image for hello-world:latest
Creating root_hello-world_1 ... done
Attaching to root_hello-world_1
hello-world_1 |
hello-world_1 | Hello from Docker!
hello-world_1 | This message shows that your installation appears to be working correctly.
hello-world_1 |
hello-world_1 | To generate this message, Docker took the following steps:
hello-world_1 | 1. The Docker client contacted the Docker daemon.
hello-world_1 | 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
hello-world_1 | (amd64)
hello-world_1 | 3. The Docker daemon created a new container from that image which runs the
hello-world_1 | executable that produces the output you are currently reading.
hello-world_1 | 4. The Docker daemon streamed that output to the Docker client, which sent it
hello-world_1 | to your terminal.
hello-world_1 |
hello-world_1 | To try something more ambitious, you can run an Ubuntu container with:
hello-world_1 | $ docker run -it ubuntu bash
hello-world_1 |
hello-world_1 | Share images, automate workflows, and more with a free Docker ID:
hello-world_1 | https://hub.docker.com/
hello-world_1 |
hello-world_1 | For more examples and ideas, visit:
hello-world_1 | https://docs.docker.com/get-started/
hello-world_1 |
root_hello-world_1 exited with code 0

After downloading the image, Docker Compose creates a container and runs the hello-world program.

If you want to see the container information, you can use the following command:

docker ps -a

The output should be similar to this:

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
31b0b7a2e9f0 hello-world:latest "/hello" 17 minutes ago Exited (0) 17 minutes ago root_hello-world_1

In this tutorial, we learned how to install Docker Compose on your Ubuntu 20.04 server, as well as the basics of how to use it.

Of course, you don’t need to do any of this if your server is covered by our Managed Linux Support services in which case you can simply ask our expert Linux admins to install Docker Composer onto your Ubuntu 20.04 server for you. They are available 24×7 and will take care of your request immediately.

PS. If you liked this post, please share it with your friends on the social networks using the buttons below, or simply leave a comment in the comment section. Thanks.

The post How to Install and Configure Docker Compose on Ubuntu 20.04 appeared first on LinuxHostSupport.

Docker Engine is available in Community Edition (CE) and Enterprise Edition (EE). In this guide, we will do the installation of Docker Community Edition on Debian 9.

Requirements

• For the purposes of this tutorial, we will be using a Debian 9 Server.
• Full SSH root access or a user with sudo privileges is also required.

Step 1: Connect via SSH

Connect to your server via SSH as the root user using the following command:

ssh root@IP_ADDRESS -p PORT_NUMBER

Remember to replace “IP_ADDRESS” and “PORT_NUMBER” with your actual server IP address and SSH port number. Replace “root” with your admin username if you’re not planning on using the root account.

Before starting with the installation, we need to update the OS packages to their latest versions.

We can do this by running the following commands:

$ apt-get update 
$ apt-get upgrade

Once the upgrade is complete, we can move on to the next step.

Step 2: Install Dependency packages

Start the installation by ensuring that all the packages used by docker as dependencies are installed.

apt-get install -y apt-transport-https ca-certificates curl gnupg2 software-properties-common build-essential

Step 3: Setting Up Docker Repository

To add the Docker repository to our server, we need to add the GPG keys first with the following commands:

curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

Once added, add the repository pointing to ‘stable’ update channel.

add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/debian $(lsb_release -cs) stable"

We can now update our packages, which should include the repository from Docker.

apt-get update

After applying the command, you should see the repository link added:

Get:5 https://download.docker.com/linux/debian stretch InRelease [44.8 kB]
Get:7 https://download.docker.com/linux/debian stretch/stable amd64 Packages [8,437 B]

Step 4: Installing Docker CE

After setting up the repository, we can now install the Docker CE, as well as the Docker CLI by running the following command:

apt-get install -y docker-ce docker-ce-cli

This might take some time as it will also install any additional libraries that it requires.

Once the installation is done, verify that the docker service is running by typing:

systemctl status docker

Output:

docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2019-07-14 03:40:16 EDT; 38s ago
     Docs: https://docs.docker.com
 Main PID: 4434 (dockerd)
   CGroup: /system.slice/docker.service
           └─4434 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

You can also check and verify the Docker version using:

docker -v

Output:

Docker version 18.09.7, build 2d0083d

Finally, make sure that the docker service will run at boot:

systemctl enable docker

The docker the group is created but no users are added. Add normal user to the group to run docker commands as a non-privileged user.

sudo usermod -aG docker $USER

Step 5: Testing Docker CE

Let’s now test if we can run Docker containers. You can test your Docker installation by running the classic “Hello World”.

$ docker run hello-world

Hello from Docker.
This message shows that your installation appears to be working correctly.
...

You can use the docker images a command to see a list of all images on your system.

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              fce289e99eb9        6 months ago        1.84kB

The docker ps command shows you all containers that are currently running.

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Since no containers are running, we see a blank line. Let’s try a more useful variant: docker ps -a

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
1a9048235446        hello-world         "/hello"            24 minutes ago      Exited (0) 24 minutes ago                       amazing_bassi

Throughout this tutorial, you will run multiple times, and leaving stray containers will eat up disk space. Hence, as a rule of thumb, I clean up containers once I’m done with them. To do that, you can run the docker rm command. Just copy the container IDs from above and paste them alongside the command.

docker rm 1a9048235446
1a9048235446

In later versions of Docker, the docker container prune command can be used to achieve the same effect.

$ docker container prune
WARNING! This will remove all stopped containers.
Are you sure you want to continue? [y/N] y

If you want to see the options available to a specific command execute the following command:

docker --help

The output should be similar to this:

That’s it! Docker CE has been successfully installed on your Debian 9 server.

Of course, you don’t need to do any of this if your server is covered by our Managed Linux Support services in which case you can simply ask our expert Linux admins to install Docker CE onto your server for you. They are available 24×7 and will take care of your request immediately.

PS. If you liked this post, please share it with your friends on the social networks using the buttons below, or simply leave a comment in the comment section. Thanks.

The post How to Install Docker Compose on Debian 9 appeared first on LinuxHostSupport.