Standalone certificate aquiry and renewal, requests certificates specified as space separated list in variable DOMAINS and tries to daily renew them. If you have subdomains in the same certificate, separate them by comma. E.g. "domain1.com domain2.com a.domain3.com,b.domain.com,c.domain.com"
If variable PREFIXES is specified, it automatically prepends the space separated content to all domains in the DOMAINS. By default, prepends www. to every domain.
Set variable MODE to standalone to run it as standalone webserver. Do so, if you don't run a webserver and you can expose port 80.
If you alreay have a webserver, set MODE to webroot to let that webserver serve /acme from a directory, that you mount in /acme. So you share the same path with your webserver.
Specifiy your mail in EMAIL to get notified when certificates expire.
Additional Options, e.g. --dry-run, can be added in variable OPTIONS.
This image is used with mwaeckerlin/reverse-proxy. Check there for a full sample.