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Docker - Apache with Let's Encrypt

This is a debian-based image which runs an apache and get's it SSL-certificates automatically from Let's Encrypt.

Instructions

Prepare your apache-config

There are some things you have to care about in your apache-config if you want to use it with certbot:

• for every domain given in DOMAINS there must be a apache-vhost which uses this domain as ServerName or ServerAlias. Else certbot won't get a certificate for this domain.
• this image contains a simple apache webserver. Therefore you can configure your vhosts like you ever did.

Run it

For an easy test-startup you just have to:

$ docker run -d --name apache-ssl birgerk/apache-letsencrypt

Now you have locally an apache running, which gets it SSL-certificates from Let's Encrypt.

The image will get letsencrypt-certificates on first boot. A cron-job renews the existing certificates automatically, so you don't have to care about it.

If you want to expand your certificate and you can remove the existing docker-container and start new one with the updated DOMAINS-list. If you don't want to recreate the container you can execute the following commands:

$ UPDATED_DOMAINS="example.org,more.example.org"
$ docker exec -it apache-ssl /run_letsencrypt.sh --domains $UPDATED_DOMAINS

Configuring docker-container

It's possible to configure the docker-container by setting the following environment-variables at container-startup:

• DOMAINS, configures which for which domains a SSL-certificate shall be requested from Let's Encrypt, default is "". Must be given as comma-seperated list, f.e.: "example.com,my-internet.org,more.example.com".
• WEBMASTER_MAIL, Let's Encrypt needs a mail-address from the webmaster of the requested domain. You have to set it, otherwise Let's Encrypt won't give the certificates. Default is "". Must be given as simple mail-address, f.e.: "[email protected]".
• STAGING, if set with a not-null string use Let's Encrypt Staging environment to avoid rate limits during development.

Location of letsencrypt-certs

After letsencrypt did authenticate your domains and you got your certificates, you'll find your certificates under /etc/letsencrypt/live/<example.com>/.

So your https-virtualhost should like:

<VirtualHost *:443>
    ServerName example.com
    ServerAdmin [email protected]
    DocumentRoot /var/www/html

    SSLCertificateFile /etc/letsencrypt/live/${VIRTUAL_HOST}/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/${VIRTUAL_HOST}/privkey.pem
    Include /etc/letsencrypt/options-ssl-apache.conf
</VirtualHost>