Docker data storage tmpfs mounts detailed explanation

Before reading this article, I hope you have a basic understanding of Volumes and Bind mounts. For details, please refer to the following articles:

• Docker Data Persistence Volumes
• Docker data persistence - Bind mounts

tmpfs mounts

Volumes and Bind mounts modes enable us to share files between the host and the container so that we can persist data on the host to avoid the problem of data loss after the container is stopped due to writing to the container storage layer.

If you are running Docker on Linux, there is another solution to avoid writing data to the container storage layer: tmpfs mounts.

tmpfs mounts, as the name implies, are a type of non-persistent data storage. It only stores data in the host's memory. Once the container stops running, the tmpfs mounts will be removed, resulting in data loss.

Use of tmpfs mounts

We can use tmpfs mounts by specifying the --tmpfs parameter or --mount parameter when running the container:

$ docker run -d \
 -it \
 --name tmptest \
 --mount type=tmpfs,destination=/app \
 nginx:latest

$ docker run -d \
 -it \
 --name tmptest \
 --tmpfs /app \
 nginx:latest

The --tmpfs parameter cannot be used to specify any other options and cannot be used with Swarm Services.

Use docker container inspect tmptest command and then view Mounts section to see:

"Tmpfs": {
 "/app": ""
},

Optional tmpfs mounts

An example:

docker run -d \
 -it \
 --name tmptest \
 --mount type=tmpfs,destination=/app,tmpfs-mode=1770 \
 nginx:latest

tmpfs mounts usage scenarios

Please refer to this article: Docker Data Storage Summary

References

https://docs.docker.com/storage/tmpfs/

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