Set, Get, And Unset Env Vars With Dokku

The dokku CLI provides config subcommands for managing environment variables for the target container.

An env var can be set for an active container with config:set:

$ dokku config:set app-name JEMALLOC_ENABLED=true MALLOC_CONF="stats_print:true"

Notice I'm able to set multiple env vars at once if needed.

If I ever need to check what an env var is currently set to for one of my app containers, I can use config:get:

$ dokku config:get app-name JEMALLOC_ENABLED
true

I can always override any value with another config:set. However, if I need to entirely remove the env var, I can use config:unset:

$ dokku config:unset app-name MALLOC_CONF