How to debug templates?

[budarin]

How to debug templates?
Are there any good practices? Or only by trial and error and endless restarts?

[budarin]

Is there a way to get all the information from docker and upload it as json so that you can debug with some third-party go utilities?

[daiyam]

I agree. We need a way to be able to debug a template.

[mmerickel]

This doesn't help debug a specific template, but it has helped me a lot in sorting through the available data. It'd be nice if this were a little more prominent imo.

docker-gen.cfg:

[[config]]
template = "/etc/docker-gen/templates/debug.tmpl"
dest = "/tmp/docker-gen.json"
notifycmd = "/bin/true"
watch = true

debug.tmpl:

{{ json (dict "Docker" .Docker "Env" .Env "RuntimeContainers" $) }}

[buchdag]

Since the inclusion of Sprig, you can also use:

{{ toPrettyJson (dict "Docker" .Docker "Env" .Env "RuntimeContainers" $) }}

Or if you prefer YAML:

{{ toYaml (dict "Docker" .Docker "Env" .Env "RuntimeContainers" $) }}