Docker, Linux

Install Docker and Docker Swarm on CentOS7

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This tutorial will show you how to install Docker and Docker Swarm on CentOS7. This tutorial is for Docker Version 1.11 and I use Vagrant and VirtualBox to create CentOS 7 in Virtual Machine.

Stop worrying about what you have to loose and start focusing on what you have to gain

Stop worrying about what you have to loose and start focusing on what you have to gain

Create a Vagrantfile for CentOS7

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Vagrant.configure(2) do |config|
  config.vm.box = "centos/7"
  config.vm.synced_folder ".", "/vagrant", disabled: true
  config.vm.network "private_network", ip: "172.20.20.21"
 
  config.vm.provider "virtualbox" do |vb|
    vb.gui = false
    vb.memory = 2048
    vb.cpus = 2
  end
end

Turn on your Virtual Machine with command:

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vagrant up

After finishing creating CentOS server, you access the server via SSH by command:

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vagrant ssh

Docker

Go to root account:

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sudo su

In the next step, we will install Docker Engine following the official tutorial of Docker.

Add Docker Repository  into CentOS

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sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF

Running the installation

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sudo yum install docker-engine

Start Docker Service

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sudo service docker start

Enable Docker run on OS Start

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sudo service enable docker

Docker Swarm

Installing Docker Swarm via Docker Pull

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docker pull swarm

Open Docker Service Configuration file

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vi /etc/systemd/system/multi-user.target.wants/docker.service

In the line contains ExecStart, we add text as below

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-H tcp://0.0.0.0:2375

And now, reload Docker Service

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systemctl daemon-reload
systemctl restart docker

Now we can run Swarm Node

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docker run -d --name swarm_joiner swarm join \
        --addr=172.20.20.21:2375 \
        token://acdb9dfa3ea6da0b0cfb2c819385fcd3

And running Swarm Manage

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docker run -d -p 12375:2375 swarm manage token://acdb9dfa3ea6da0b0cfb2c819385fcd3

Finally, verify your work

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docker -H :12375 info

Video

Thanks for your reading!!!

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Nguyen Sy Thanh Son

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