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Update part3.md (#4119) 

* Update part3.md

* Update part3.md
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Wang Jie 2017-08-11 01:55:22 +08:00 committed by Misty Stanley-Jones
parent 17544f7862
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@ -39,7 +39,7 @@ must go one level up in the hierarchy of a distributed application: the
- **Services** (you are here) - **Services** (you are here)
- Container (covered in [part 2](part2.md)) - Container (covered in [part 2](part2.md))
## Understanding services ## About services
In a distributed application, different pieces of the app are called "services." In a distributed application, different pieces of the app are called "services."
For example, if you imagine a video sharing site, it probably includes a service For example, if you imagine a video sharing site, it probably includes a service
@ -57,7 +57,7 @@ service in the process.
Luckily it's very easy to define, run, and scale services with the Docker Luckily it's very easy to define, run, and scale services with the Docker
platform -- just write a `docker-compose.yml` file. platform -- just write a `docker-compose.yml` file.
## Your first `docker-compose.yml` File ## Your first `docker-compose.yml` file
A `docker-compose.yml` file is a YAML file that defines how Docker containers A `docker-compose.yml` file is a YAML file that defines how Docker containers
should behave in production. should behave in production.