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OpenSSL Alpine

Customisation

Override the following environment variables when running the docker container to customise the generated certificate:

VARIABLE DESCRIPTION DEFAULT
COUNTY Certificate subject country string UK
STATE Certificate subject state string Greater London
LOCATION Certificate subject location string London
ORGANISATION Certificate subject organisation string Example
ROOT_CN Root certificate common name Root
ISSUER_CN Intermediate issuer certificate common name Example Ltd
PUBLIC_CN Public certificate common name *.example.com
ROOT_NAME Root certificate filename root
ISSUER_NAME Intermediate issuer certificate filename example
PUBLIC_NAME Public certificate filename public
RSA_KEY_NUMBITS The size of the rsa keys to generate in bits 2048
DAYS The number of days to certify the certificates for 365

For example:

docker run \
  -e COUNTY="ME" \
  -e STATE="Middle Earth" \
  -e LOCATION="The Shire" \
  -e ORGANISATION="Hobbit" \
  -e ISSUER_CN="J R R Tolkien" \
  -e PUBLIC_CN="hobbit.com" \
  -e ISSUER_NAME="tolkien" \
  -e PUBLIC_NAME="hobbit" \
  -v hobbit:/etc/ssl/certs \
  vitaliytv/openssl-alpine

List the generated certificates:

ls -la /var/lib/docker/volumes/hobbit/_data

View the public certificate details:

openssl x509 -in /var/lib/docker/volumes/hobbit/_data/hobbit.crt -text -noout