In this tutorial, I will show how to use Let's Encrypt free SSL with a standalone Jenkins in Ubuntu 16.04.
Installation of certbot and jenkins are not included in this tutorial.
Run the command to generate the certificate and key files.
sudo certbot certonly --standalone --preferred-challenges http -d example.com
You should get this response:
Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Obtaining a new certificate Performing the following challenges: http-01 challenge for example.com Waiting for verification... Cleaning up challenges IMPORTANT NOTES: - Congratulations! Your certificate and chain have been saved at: /etc/letsencrypt/live/example.com/fullchain.pem Your key file has been saved at: /etc/letsencrypt/live/example.com/privkey.pem Your cert will expire on 2019-02-07. To obtain a new or tweaked version of this certificate in the future, simply run certbot again. To non-interactively renew *all* of your certificates, run "certbot renew" - If you like Certbot, please consider supporting our work by: Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate Donating to EFF: https://eff.org/donate-le
Just in case you got this response:
Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator standalone, Installer None Obtaining a new certificate Performing the following challenges: http-01 challenge for example.com Cleaning up challenges Problem binding to port 80: Could not bind to IPv4 or IPv6.
You need to stop your web server and try again.
Convert the certificate to JKS keystore
Go to your certificate folder
And execute this command to convert the certificate to PKCS12 file first
openssl pkcs12 -inkey privkey.pem -in cert.pem -export -out keys.pkcs12
Then convert to JKS file
keytool -importkeystore -srckeystore keys.pkcs12 -srcstoretype pkcs12 -destkeystore /var/lib/jenkins/jenkins.jks
Set Jenkins configuration to use the SSL
Edit the Jenkins config file
Look for JENKINS_ARGS and update the value to this:
JENKINS_ARGS="--webroot=/var/cache/$NAME/war --httpPort=-1 --httpsPort=8443 --httpsKeyStore=/var/lib/jenkins/jenkins.jks --httpsKeyStorePassword=PASSWORD_SET_ON_CONVERT_TO_JKS"
sudo service jenkins restart