Day 18 Task: Docker for DevOps Engineers -Part2

Dear Engineers in today topic we will learn the Docker for the DevOps Engineers Part-2

Docker compose is a tool used for the developed to help define and share multiple container applications.With the help of docker compose command we can create a yaml file to determine the services with one single command.

What is YAML?

Yaml is a popular programming language because it is human readbale and easy to understand YAML files use .yml or .yaml extension

Task-1

Docker compose- it is a tool that defining the running multi-container Docker applications. with the help of compose you use a yaml file to configure your applications.

Install the docker-compose

Syntax:- sudo apt-get install docker-compose -y

sudo apt-get install docker-compose -y Diagram.

Step 2 : Create a docker-compose.yml file inside project folder

Docker compose yaml file Diagram.

• Version:3.3 it denotes we are using the version 3.3 docker compose.

• Services: it wlill defines the different containers we will create.

• build: keyword specifies the location of our dockerfile and represents the directory.

• image:specify the image from docker hub for mysql containers

• ports: keyword used for the ports that need to be exposed.

• environment variables: for mysql which are required to run mysql.

• Step 3: Run docker-compose.yml file

docker ps or docker-compose ps command list all the containers in the current docker-compose file.

Task-2

1 Pull a pre-existing docker image form a public repository (eg docker hub)

docker pull nginx:alpine

for running container as a non-root user, use command usermod to give user permission to docker

syntax: sudo usermod -a -G docker $USER

sudo usermod -a -G docker $USER

2 Inspect the container running process and exposed ports using the docker inspect command

syntax:- docker inspect <container_name or id>

docker inspect <container_name or id> Diagram.

3 Use the docker logs command to view the docker container log output

Synatx: sudo docker logs <container_name or ID>

sudo docker Containers logs Diagram

4 Use the docker stop and docker start commands to stop and start the container.

syntax: sudo docker stop <container-name or ID>

sudo docker stop <container-name or ID>

Syntax: sudo docker start <container-name or ID>

sudo docker start <container-name or ID> Diagram.

5 use the docker rm command to remove the container when you are done docker rm. remove one or more containers.

Syntax: sudo docker rm <container_name or ID>

sudo docker rm <container_name or ID> Diagram.

Thank you for reading the article!!