Docker container providing nginx/letsencrypt support
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Nico Schottelius 6f9c38783d Add debugging output + build script 2021-10-11 12:28:20 +09:00
Dockerfile Add debugging output + build script 2021-10-11 12:28:20 +09:00 Make container use nginx 2021-10-10 16:05:51 +09:00 Add debugging output + build script 2021-10-11 12:28:20 +09:00 Add debugging output + build script 2021-10-11 12:28:20 +09:00


This container is made for getting real world certificates for your kubernetes cluster.

The assumption is that you can point the DNS name to the container from outside. This is by default given for IPv6 only kubernetes services.


  • Set the environment variable DOMAIN to specify the domain for which to get a certificate
  • Set the environment variable EMAIL (this is where letsencrypt sends warnings to)
  • Set the environment variable STAGING to "no" if you want to have proper certificates - this is to prevent you from asking the real letsencrypt service accidently by default
  • By default the container allows world read access to the certificates, so that non-root users can access the certificates. Set the LEAVE_PERMISSIONS_AS_IS environment variable to instruct the container not to change permissions
  • If you setup the variable NGINX to any value, the container will start nginx and reload after trying to renew the certificate
docker run -e \
           -e \

Nginx support


docker run -e \
           -e \
           -e NGINX=yes \
           -e STAGING=no \

you will get a proper, real world usable nginx server. Inject the nginx configuration by meains of a volume to /etc/nginx/conf.d

Exiting after getting the certificate

By default, the container will stay alive and try to renew the certificate every 86400 seconds. If you set the environment variable ONLYGETCERT, then it will only get the certificates and exit.

Only renewing the certificate

If you only want to trigger renewing existing certificates and skip getting the certificates initially, you can set the variable RENEWCERTSONCE, then it will only renew all certificates and exit.

  • If ONLYRENEWCERTS is set, only the reguler renew loop will run.
  • If ONLYRENEWCERTSONCE is set, renew will be run once and then the container exits


If you want to keep / use your certificates, you are advised to create a volume below /etc/letsencrypt.