Docker
containers are built from Docker images which can be downloaded from Docker
Hub. Docker Hub is a cloud-based registry contains Docker images either in a
public or private repository.
This article
describes How to pull and run Docker images on CentOS7.
Step 1. Searching Docker Images: To
search Docker images just run Docker sub command Docker search
<image_name> as shown below:
|
[root@linuxcnf
~]# docker search centos
INDEX NAME
DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/centos The official
build of CentOS. 5694 [OK]
docker.io docker.io/ansible/centos7-ansible Ansible on Centos7 126 [OK]
……………………………
docker.io docker.io/pivotaldata/centos7-dev CentosOS 7 image for GPDB
development 0
docker.io docker.io/smartentry/centos centos with smartentry 0 [OK]
[root@linuxcnf
~]#
|
Step 2. Download Image: Run
the following Docker sub command pull to download appropriate image from Docker
official repository:
|
[root@linuxcnf
~]# docker image pull centos
Using
default tag: latest
Trying
to pull repository docker.io/library/centos ...
latest:
Pulling from docker.io/library/centos
729ec3a6ada3:
Pull complete
Digest:
sha256:f94c1d992c193b3dc09e297ffd54d8a4f1dc946c37cbeceb26d35ce1647f88d9
Status:
Downloaded newer image for docker.io/centos:latest
[root@linuxcnf
~]#
|
Step 3. Verify Downloaded Image: Once
the image is downloaded, run the following command to verify the downloaded image:
|
[root@linuxcnf
~]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos latest 0f3e07c0138f 7 weeks ago 220 MB
[root@linuxcnf
~]#
|
Step 4. Run the Docker Image: Run
the downloaded Docker image by executing Docker sub command Docker container:
|
[root@linuxcnf
~]# docker container run -it centos /bin/bash
[root@c0860928ec75
/]#
|
|
[root@c0860928ec75
/]# cat /etc/centos-release
CentOS
Linux release 8.0.1905 (Core)
[root@c0860928ec75
/]# exit
exit
[root@linuxcnf
~]#
|
Done!!!
Docker image pulled and executed successfully and entered into interactive bash
shell for use.
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