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Created June 3, 2018 19:08
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Automatically add SSL server certificate to list of trusted certificates during build
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Dockerfile
FROM openjdk:8-jdk-alpine
ENV EMAIL_HOSTNAME="smtp.gmail.com"
ENV EMAIL_PORT="587"
RUN apk add --no-cache openssl
RUN openssl s_client -showcerts -connect $EMAIL_HOSTNAME:$EMAIL_PORT -starttls smtp </dev/null 2>/dev/null | openssl x509 -outform DER > my-certificate.der
RUN echo yes | $JAVA_HOME/bin/keytool -import -trustcacerts -file my-certificate.der -alias my-certificate -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit
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