GNU/Linux Desktop Survival Guide by Graham Williams
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Renew SSL Certificate

Our example uses a self-signed certificate. To renew the certificate for 365 days (for apache1 or apache2):

  # cd /etc/apache2/ssl
  # openssl genrsa -out togaware.com.key 1024
  # chmod 600 togaware.com.key
  # openssl req -new -key togaware.com.key -out togaware.com.csr
    AU
    ACT
    Canberra
    Togaware
    Data Mining
    Kayon Toga
    Kayon.Toga@togaware.com
    (no challenge password)
  # openssl x509 -req -days 365 -in togaware.com.csr \
            -signkey togaware.com.key -out togaware.com.crt
  # mv apache.pem apache.pem.old
  # cp togaware.com.key apache.pem 
  # cat togaware.com.crt >> apache.pem 
  # chmod 600 apache.pem
  # wajig restart apache2

A more detail explanation is available from http://www.euhq.org/debian-apache-ssl-howto.html.