Docker for Beginner's
Devops series
16 November, 2022
3
3
1
Contributors
Source from Zeal Vora,KPLABS Course(Premium Instructor at Udemy) Udemy
Zeal is one of my favorite author for docker. Please try to yourself 💖
(Tip: HE is ready to give some discount for students 😜)
-----------------Table of content-----------------
1.
What is docker and why we need ?
2.
Docker Installation and pre-requisite
3.
Image VS. Containers
4.
Basic commands
5.
port binding
6.
Attached and detached mode
7.
Restart policy
8.
Disk usage
1.Container and purpose
Docker is the set of alone process and container tool. Its easy to deploy the microservice with running application using the containers.
•
Weightless
•
Movable
•
Compact
2. Docker Installation and pre-requisite
Docker available in variety of operating systems, this includes:
The installation of Docker is pretty straight forward in each one of them.
3. Image VS. Containers
Microservice application (Recipe of microservice) procedural code is called image
Running docker image is called container.
4. Basic commands
docker images - List the docker imagesdocker pull image-name i Pull the image from docker hub
docker ps - List the container
docker stop container-ID - Stop the container
docker start container-ID - Start the container
docker rm -f image name - Remove the docker image
netstat -ntlp - See the running port
docker exec -it container-id /bin/bash - Goto inside the container
docker run -dt -p containerport:actualport --name=anyname conatainer id - Port mapping with container
docker container stop $(docker container ls -aq) - Stop the all containerdocker container rm $(docker container ls -aq) - Remove the all container5. port binding
Goto inside the container
docker exec -it container-id /bin/bashPort mapping with container
docker run -dt -p 80:81 --name=anyname conatainer id
6. Attached and detached mode
docker run -dtd - detached mode
t - terminal tty
When we start a docker container, we need to decide if we want to run in a default foreground mode or the detached mode.
You may want to use this if you want a container to run but do not want to view and follow all its output
7. Restart policy
when docker daemon is stopped that time entire container goes
down. we avoid that situation so we using the restart policy
•
no - Do not automatically restart the container
•
on-failure - Restart the container if its exists due to an error
•
unless-stopped - Restart the container unless it is explicitly stopped
•
always - Always restart the container if it stops
8. Disk usage
docker system df
docker
devops
development
develevate
begginer