Run Minio on Dokku

What is Minio?

Minio is an object storage server, and API compatible with Amazon S3 cloud storage service. Read more at the minio.io website.

What is Dokku?

Dokku is the smallest PaaS implementation you've ever seen - Docker powered mini-Heroku.

Requirements

A working Dokku host

Setup

Note: We are going to use the domain minio.example.com for demonstration purposes. Make sure to replace it to your domain name.

Create the app

Log onto your Dokku Host to create the Minio app:

dokku apps:create minio

Configuration

Setting access keys

Minio uses two access keys (ACCESS_KEY and SECRET_KEY) for authentication and object management. The following commands sets a random strings for each access key.

dokku config:set minio MINIO_ACCESS_KEY=$(echo `openssl rand -base64 45` | tr -d \=+ | cut -c 1-20)
dokku config:set minio MINIO_SECRET_KEY=$(echo `openssl rand -base64 45` | tr -d \=+ | cut -c 1-32)

To login in the browser or via API, you will need to supply both the ACCESS_KEY and SECRET_KEY. You can retrieve these at any time while logged in on your host running dokku via dokku config minio.

Note: If you do not set these keys, Minio will generate them during startup and output them to the log (check if via dokku logs minio). You will still need to set them manually.

Persistent storage

To persists uploaded data between restarts, we create a folder on the host machine, add write permissions to the user defined in Dockerfile and tell Dokku to mount it to the app container.

sudo mkdir -p /var/lib/dokku/data/storage/minio/data
sudo mkdir -p /var/lib/dokku/data/storage/minio/config
sudo chown -R 32767:32767 /var/lib/dokku/data/storage/minio
dokku storage:mount minio /var/lib/dokku/data/storage/minio/data:/home/dokku/data
dokku storage:mount minio /var/lib/dokku/data/storage/minio/config:/home/dokku/.minio

More information on Persistent Storage in Dokku is available on the Dokku documentation

Domain setup

To get the routing working, we need to apply a few settings. First we set the domain.

dokku domains:set minio minio.example.com

The parent Dockerfile, provided by the Minio project, exposes port 9000 for web requests. Dokku will set up this port for outside communication, as explained in its documentation. Because we want Minio to be available on the default port 80 (or 443 for SSL), we need to fiddle around with the proxy settings.

First add the correct port mapping for this project as defined in the parent Dockerfile.

dokku proxy:ports-add minio http:80:9000

If you also need SSL support:

dokku proxy:ports-add minio https:443:9000

Next remove the proxy mapping added by Dokku.

dokku proxy:ports-remove minio http:80:5000

Push Minio to Dokku

Grabbing the repository

First clone this repository onto your machine.

Via SSH

git clone git@github.com:slypix/minio-dokku.git

Via HTTPS

git clone https://github.com/slypix/minio-dokku.git

Set up git remote

Now you need to set up your Dokku server as a remote.

git remote add dokku dokku@example.com:minio

Push Minio

Now we can push Minio to Dokku (before moving on to the next part).

git push dokku master

SSL certificate

Last but not least, we can go an grab the SSL certificate from Let's Encrypt.

dokku config:set --no-restart minio DOKKU_LETSENCRYPT_EMAIL=you@example.com
dokku letsencrypt minio

Disabling Web UI

In certain cases, you may not want to expose the web UI (browser) for minio. This can easily be done by adding an environment variable MINIO_BROWSER to off.

dokku config:set minio MINIO_BROWSER=off

Wrapping up

Your Minio instance should now be available on https://minio.example.com.

shrmnk/minio-dokku