Docker in RHEL-7 or Higher Versions

Hardware and software requirements

• Linux kernel version 3.10 or higher
• CS Docker Engine version 1.10 or higher. Learn about the operating systems supported by CS Docker Engine.
• 2.00 GB of RAM
• 3.00 GB of available disk space
• A static IP address

Install Docker Container

# wget –c https://download.docker.com/linux/centos/docker-ce.repo

# cp docker-ce.repo /etc/yum.repos.d/

# yum install docker* -y

Start/Stop/Restart/ Docker Service

# systemctl start docker.service

# systemctl stop docker.service

# systemctl restart docker.service

# systemctl status docker.service

# systemctl enable docker.service

Docker Command for Help

# docker images ## List images ##

# docker ps ## List containers ##

# docker run -it –name “Name” centos ## Run a command in a new container ##

# docker exec –it “Name” /bin//bash ## Run a command in a running container ##

# docker save -o “Name.docker” container_id ## Save one or more images to a tar archive

(streamed to STDOUT by default) ##

# docker load –I images.docker ## Load an image from a tar archive or STDIN ##

# docker commit –m “Any” –a “any” container_id NewName:version ## Create a new image

from a container's changes ##

# docker cp file/Path “Docker_Name:/path” ## Copy files/folders between a container and the

local filesystem ##

# docker stop “Docker_Name” ## Stop one or more running containers ##

# docker start “Docker_Name” ## Display a live stream of container(s) resource

usage statistics ##

# docker rm “Docker_Name” ## Remove one or more containers ##

# docker rmi “Docker_Image” ## Remove one or more images ##

# docker logs “Docker_Name” ## Fetch the logs of a container ##

# docker “Command” --help ## For Docker Command Help ##

Search Docker Image

# docker search “Name”

How to Pull Docker Image

# docker pull Centos

How to run Docker Image

# docker run -it –name “Any Name” “ Docker Image”

How to run apache server in 

Docker

Steps: -

# docker Pull Centos

# docker run –it –name apache centos: latest /bin/bash

c48f56515552 # yum install http* -y

c48f56515552 # /usr/sbin/httpd

c48f56515552 # ps ax

c48f56515552 # kill -9 Apache_PID

Open New Tab of Docker Host Machine

# mkdir /DOCKER

# cd /DOCKER

# mkdir http

# docker cp apache:/etc/httpd .

# chmod –R 777 *

# docker commit –m “for Apache” –a “by raju” 127684DG28H apache:v1

Open OlD Tab

c48f56515552 # exit

# docker rm apache

# docker run –it –p 80:80 -v /DOCKER/http:/var/www/html -v /DOCKER/httpd:/etc/httpd --name apache apache:v1

C48f66514452 # exit

# docker ps

# docker start apache

# docker exec -it apache /bin/bash

C48f66514452 # /usr/sbhi/httpd

C48f66514452 # ps ax

C48f66514452 # exit

# cd /DOCKER/http

# vim index.html

Web Server

Open web browser and type http://you_host_machine IP