Dokku

@dokku @docker @container

Persistent storage

http://dokku.viewdocs.io/dokku/advanced-usage/persistent-storage/
Dokku's default storage mount point in the container is /storage and I have no reason to change that. On the server, you want to create a folder for your app in:

$ mkdir -p /var/lib/dokku/data/storage/<appname>

Then, you must set the permissions so that dokku and your container have access (32767 is the default container group id if you are using buildpacks:

$ sudo chown -R dokku:dokku /var/lib/dokku/data/storage/<appname>
$ sudo chown -R 32767:32767 /var/lib/dokku/data/storage/<appname>

Then just mount the storage. This command mounts your server storage directory to a folder in the container /storage.

$ dokku storage: mount <appname> /var/lib/dokku/data/storage/<appname>:/storage

If using Django, remember to configure your MEDIA_ROOT to be /storage
Check that your storage is mounted correctly, then restart the container

$ dokku storage:list <apname>
$ dokku ps:rebuild <appname>

This storage should remain mounted to the app unless you destroy and redeploy your server

Configuring nginx to serve files on Dokku persistent storage

http://dokku.viewdocs.io/dokku/configuration/nginx/

To manually configure nginx to correctly serve your media files in the container. Copy the contents from here and paste them into a file called nginx.conf.sigil in your project root (where Procfile is). Look for loops with http and https conditionals, and before the first location / {...} statement for both http and https (where / means site root, add another location statement:

location /media/ {

alias /var/lib/dokku/data/storage/<appname>;

}

This will tell your nginx to serve files at yoursite.com/media from the path on the server (NOT container) that you want (in this case /var/lib/dokku/data/storage/<appname>
If using Django, remember to configure your MEDIA_URL

Telling Dokku to install a specific Python version

This is assuming you are using the official Python buildpack: https://github.com/heroku/heroku-buildpack-python.git
Create a file in your project root (where the Procfile is) called runtime.txt
Inside this, simply add the version of Python you want, e.g. python-3.8.2
Now, when you push your site, it will install the specific version of Python.

Add SSL certificates to your apps

https://github.com/dokku/dokku-letsencrypt
First, install the letsencrypt plugin:

$ sudo dokku plugin:install https://github.com/dokku/dokku-letsencrypt.git

Then set your email for the certificate:

$ dokku config:set --no-restart <appname> DOKKU_LETSENCRYPT_EMAIL=<email>

or, for global email setting, do:

$ dokku config:set --no-restart --global DOKKU_LETSENCRYPT_EMAIL=<email>

Finally, set auto-renewal of certs by doing:

$ dokku letsencrypt:cron-job --add

Backing up postgres database

The general format is:

# To dump data:
$ dokku postgres:export <db_service> > <backupname>

# To import data:
$ dokku postgres:import <db_service> < <backupname>

For this you have to be using the dokku postgres plugin.