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instructions to limit RAM use #1

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10 changes: 10 additions & 0 deletions README.md
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Expand Up @@ -10,13 +10,23 @@ Our dockerfile consists of all project dependancies required to run each of our
- Change directory to the docker-tutorial folder
- Build the Dockerfile.buster and wait for the process to finish
- Run the docker image as *-id* interactive and detached so it is running in the background
- Note: Read below section on RAM use before running for the first time!

```shell
git clone https://github.com/PortlandStatePowerLab/docker-tutorial
cd docker-tutorial
docker build --file Dockerfile.buster --tag psu-dev .
docker run -id psu-dev
```
### Creeping Host Machine RAM Use
Note: It is a well-documented problem that docker containers will "creep," their use of the host machine's RAM. To solve this problem, you can specify a limit to the RAM used by the container. This link contains more details: https://docs.docker.com/config/containers/resource_constraints/

To do this for the above instructions, you can try replacing `docker run -id psu-dev` with the following:

```shell
docker run -id -m "4g" psu-dev
```
Where the `"4g"` in quotes is the RAM ceiling for the container (in gigabytes, as specified by the g).

## Saving/Loading Image
I have found that my machine will delete images after a system update. This is actually a common issue that will hopefully be fixed soon. If you have room on your machine, approximatly 3 GB, I recommend saving the image to a tar file so that you can always reload the image if something happens.
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