#27 Docker Compose

Lecture-15 Docker Compose Part-1

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.

Compose works in all environments: production, staging, development, testing, as well as CI workflows. It also has commands for managing the whole lifecycle of your application:

• Start, stop, and rebuild services

• View the status of running services

• Stream the log output of running services

• Run a one-off command on a service

The key features of Compose that make it effective are:

• Have multiple isolated environments on a single host

• Preserves volume data when containers are created

• Only recreate containers that have changed

• Supports variables and moving a composition between environments

• Docker composes installation:

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  Creating multiple containers in a single yaml file by using docker-compose

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  Lecture-16 Docker Compose Part-2

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  Port mapping:

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  Creating replicas of containers.

• scale-up:

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  scale down:

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  Only it will download

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  rm - will remove the stopped container.

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  If multiple projects are there you need to mention the file name.

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  YAML to JSON:

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• Lecture-17 Docker Compose Part-3

• docker-compose --help

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  The difference between build will run the particular parameter and up will run all the parameters which are mentioned in the file.

• docker-compose config: will display the content of the file

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