Difference between Dockerfile and docker-compose
A Dockerfile is a text document that contains all the commands/Instruction a user could call on the command line to assemble an image.
For example
FROM centos:latest
LABEL maintainer="collabnix"
RUN yum update -y && \
yum install -y httpd net-tools && \
mkdir -p /run/httpd
EXPOSE 80
ENTRYPOINT apachectl "-DFOREGROUND"
Using docker build commmand we can build an image from a Dockerfile.
Docker Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration. By default, docker-compose expects the name of the Compose file as docker-compose.yml or docker-compose.yaml. If the compose file have different name we can specify it with -f flag.
A docker-compose.yml looks like this:
version: '3'
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
- logvolume01:/var/log
links:
- redis
redis:
image: redis
volumes:
logvolume01: {}