Setup Docker Repository – Linux Book Center

Before installing the Docker Engine on your host, you need to setup the repository first. So, will see How to setup Docker Repository in this post.
After that, you can Install/Update the Docker from the repository.

Setup Docker Repository:

Yum should be configured on your host. Please use this post to know How to configure yum repository
Than, Packages required: yum-utils, yum-config-manager and device-mapper-persistent-data, lvm2 are required for devicemapper
Storage driver.
use below command to to install above mentioned packages using yum

#yum install -y yum-utils device-mapper-persistent-data lvm2

Since the packages are already installed on my host, Update has been done

Updated:

  device-mapper-persistent-data.x86_64 0:0.8.5-1.el7                                               lvm2.x86_64 7:2.02.185-2.el7_7.2

Use the below command to setup Docker Repository

#yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

    Loaded plugins: fastestmirror

    adding repo from: https://download.docker.com/linux/centos/docker-ce.repo

    grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo

    repo saved to /etc/yum.repos.d/docker-ce.repo

And check whether the repository added or not by issuing below command

#yum repolist | grep Docker

    docker-ce-stable/x86_64     Docker CE Stable - x86_64                         63

Installing Docker Engine:

To confirm the successful completion of Repository setup, will try to install New version of Docker engine now using below command.

#yum install docker-ce docker-ce-cli containerd.io 
 
Installed:
   containerd.io.x86_64 0:1.2.10-3.2.el7                       docker-ce.x86_64 3:19.03.5-3.el7                       docker-ce-cli.x86_64 1:19.03.5-3.el7 
 
Dependency Installed:
   container-selinux.noarch 2:2.107-3.el7                                                     libseccomp.x86_64 0:2.3.1-3.el7

Now start the Docker Engine:

# systemctl start docker
 
# systemctl status docker
  ● docker.service - Docker Application Container Engine
    Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
    Active: active (running) since Thu 2020-01-02 02:14:11 EST; 8s ago
      Docs: https://docs.docker.com
   Main PID: 60692 (dockerd)
    Memory: 37.6M
    CGroup: /system.slice/docker.service
            └─60692 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock  
 
Jan 02 02:14:10 localhost dockerd[60692]: time="2020-01-02T02:14:10.667134175-05:00" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:/…odule=grpc
   Jan 02 02:14:10 localhost dockerd[60692]: time="2020-01-02T02:14:10.667153441-05:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
   Jan 02 02:14:10 localhost dockerd[60692]: time="2020-01-02T02:14:10.695465002-05:00" level=info msg="Loading containers: start."
   Jan 02 02:14:10 localhost dockerd[60692]: time="2020-01-02T02:14:10.952900918-05:00" level=info msg="Default bridge (docker0) is assigned with an IP ad…P address"
   Jan 02 02:14:11 localhost dockerd[60692]: time="2020-01-02T02:14:11.018716067-05:00" level=info msg="Loading containers: done."
   Jan 02 02:14:11 localhost dockerd[60692]: time="2020-01-02T02:14:11.040693143-05:00" level=warning msg="Not using native diff for overlay2, this may ca…r=overlay2
   Jan 02 02:14:11 localhost dockerd[60692]: time="2020-01-02T02:14:11.041056334-05:00" level=info msg="Docker daemon" commit=633a0ea graphdriver(s)=overl…on=19.03.5
   Jan 02 02:14:11 localhost dockerd[60692]: time="2020-01-02T02:14:11.041178502-05:00" level=info msg="Daemon has completed initialization"
   Jan 02 02:14:11 localhost dockerd[60692]: time="2020-01-02T02:14:11.072808771-05:00" level=info msg="API listen on /var/run/docker.sock"
   Jan 02 02:14:11 localhost systemd[1]: Started Docker Application Container Engine.
   Hint: Some lines were ellipsized, use -l to show in full.

Now verify the Docker using below command

# docker run hello-world
     Unable to find image 'hello-world:latest' locally
     latest: Pulling from library/hello-world
     1b930d010525: Pull complete
     Digest: sha256:4fe721ccc2e8dc7362278a29dc660d833570ec2682f4e4194f4ee23e415e1064
     Status: Downloaded newer image for hello-world:latest

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

 
To generate this message, Docker took the following steps:
      1. The Docker client contacted the Docker daemon.
      2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
         (amd64)
      3. The Docker daemon created a new container from that image which runs the
         executable that produces the output you are currently reading.
      4. The Docker daemon streamed that output to the Docker client, which sent it
         to your terminal. 

 
To try something more ambitious, you can run an Ubuntu container with:
      $ docker run -it ubuntu bash 

 
Share images, automate workflows, and more with a free Docker ID:
      https://hub.docker.com/ 


For more examples and ideas, visit:
      https://docs.docker.com/get-started/

Thanks for reading this post and going forward will talk about Docker Engine more…

Reference: Docker Docs

Setup Docker Repository:

Installing Docker Engine:

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