100-Days-Of-DevOps-Challenge-KodeKloud

Creating a Docker Compose File

The Nautilus application development team shared static website content that needs to be hosted on the httpd web server using a containerised platform. The team has shared details with the DevOps team, and we need to set up an environment according to those guidelines. Below are the details:

On App Server 3 in Stratos DC create a container named httpd using a docker compose file /opt/docker/docker-compose.yml (please use the exact name for file).
Use httpd (preferably latest tag) image for container and make sure container is named as httpd; you can use any name for service.
Map 80 number port of container with port 3003 of docker host.
Map container’s /usr/local/apache2/htdocs volume with /opt/itadmin volume of docker host which is already there. (please do not modify any data within these locations).

Steps

Login into App Server 3
Make sure docker is running and accessible, you can check simply runing:
```
 docker ps
```
Let’s create the /opt/docker/docker-compose.yml file:
```
 sudo touch /opt/docker/docker-compose.yml
```
- Open the file in editor and copy paste the contents from this file

Let’s run the compose file

 docker compose -f /opt/docker/docker-compose.yml up -d

Let’s verify if it’s running or not

 docker ps

It should display the output like this:

 banner@stapp03 ~]$ docker ps
 CONTAINER ID   IMAGE          COMMAND              CREATED          STATUS          PORTS                  NAMES
 31c6d90cafa8   httpd:latest   "httpd-foreground"   37 seconds ago   Up 35 seconds   0.0.0.0:3003->80/tcp   httpd

Good to Know?

Docker Compose

Purpose: Define and run multi-container Docker applications
YAML Configuration: Declarative service definitions
Orchestration: Manage multiple containers as single application
Development: Simplify local development environments

Compose File Structure

version: Compose file format version
services: Define application containers
networks: Custom network configuration
volumes: Persistent data storage

Service Configuration

image: Docker image to use for container
container_name: Custom name for container
ports: Port mapping between host and container
volumes: Mount host directories or named volumes
environment: Set environment variables

Compose Commands

Up: docker-compose up -d (start services)
Down: docker-compose down (stop and remove)
Logs: docker-compose logs (view service logs)
Scale: docker-compose up --scale service=3

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