When supplying TLS certificates and configuring --ssl-* properties the startup will fail with
2019-05-10 23:54:54 [ERROR] Could not find OpenSSL on the system
This seems to be caused by this code:
if command -v mysql_ssl_rsa_setup > /dev/null && [ ! -e "$DATADIR/server-key.pem" ]; then
# https: echo 'Initializing certificates'
echo 'Certificates initialized'
mysql_ssl_rsa_setup seems to rely on running the openssl cli, which is not installed in the image, so this process fails.
Tested on percona:5.7 images.