10 Ways to Manage Environment Variables with Dokku Config Commands
Dokku is an awesome open-soure project that makes it really simple to setup and manage your own docker-powered PaaS (Platform-as-a-Service). If you're a solo developer or working in a small team with a low budget, Dokku is godsend.
Most applications requires some sort configuration to function and run securely. This can be anything from API keys, secret keys or other settings. The industry standard is to use a .env file with environment variables to handle these settings securely. We do not want to have these keys visible to praying eyes in our Git repository or else where sensitive information could be exposed.
Dokku has multiple commands dedicated to managing environment variables. Today we are going to take a look at how we can set and manage our environment (.env) variables for your Dokku instance.
Dokku Configuration Commands
config (|--global) Pretty-print an app or global environment config:bundle (|--global) [--merged] Bundle environment into tarfile config:clear (|--global) Clears environment variables config:export (|--global) [--envfile] Export a global or app environment config:get (|--global) KEY Display a global or app-specific config value config:keys (|--global) [--merged] Show keys set in environment config:set [--encoded] [--no-restart] (|--global) KEY1=VALUE1 [KEY2=VALUE2 ...] Set one or more config vars config:unset [--no-restart] (|--global) KEY1 [KEY2 ...] Unset one or more config vars
View current environment variables for a specific application
To get an overview what enviroment variables is set for a specific application we can simply run an empty config command. This is useful when you need to know if an enviroment variable that you require is set or not.
dokku config appname
Set an environment variable for a specific application
The config:set command is possibly the most commonly used command. You can set an environment variable for a specific application as following.
dokku config:set appname VAR=Value
Set a global environment variable
We can also set global enviroment variables with the --global flag. This is handy if you need to set a environment variable that works for all containers.
dokku config:set --global VAR=Value
Set multiple environment variables at the same time
Sometimes you application requires a ton of configuration where a hand full of variables needs to be set. To save some time you can set multiple environment variables at the same time.
dokku config:set appname VAR1=Value1 VAR2=Value2 VAR3=Value3
Set environment variable without server restart
Everytime you set a new variable your server is restarted. This is not always the wanted outcome, you can surpass the automatic restart by utilizing the --no-restart flag
dokku config:set --no-restart appname VAR=Value
Set environment variables with spaces & special charaters
Sometimes your environment values need to contain spaces, you can achive this by double quoting your string and backslash-escape the spaces. The double quotation can also be used if your value contains special charaters.
dokku config:set appname VAR="Value\ With\ Spaces"
Set Base64 encoded environment variables
In rare ocations you need to Base64 encode a value. Dokku can read Base64 encoded values which can be achived by utilizing the --encode flag.
dokku config:set --encoded appname VAR="$(base64 ~/.ssh/id_rsa)"
Delete a specific environment variable for a specific application
If you want to get rid of a specific environment varaible for a specific app you can use the config:unset followed by the appname and variable.
dokku config:unset appname VAR1
Delete all environment variable for a specific application
To delete all your environment variables for a specific application we can use the config:clear command.
dokku config:clear appname
Clear all global enironment variables
To delete all global environment variables we can use the --global flag.
dokku config:clear --global