Managing your cloud resources with OpenStack: Difference between revisions

An example of a CIDR rule is <code>192.168.1.1/24</code>. This looks just like a normal IP address with a <code>/24</code> appended to it. IP addresses are made up of 4, 1-byte (8 bits) numbers ranging from 0 to 255. What this <code>/24</code> means is that this CIDR rule will match the first left most 24 bits (3 bytes) of an IP address. In this case, any IP address starting with <code>192.168.1</code> will match this CIDR rule. If <code>/32</code> is appended, the full 32 bits of the IP address must match exactly; if <code>/0</code> is appended, no bits must match and therefore any IP address will match it.

You can customize your instance after it has launched using CloudInit. This can be done via the OpenStack Command Line Interface or the Dashboard when launching an instance under the "Configuration" tab of the "Launch Instance" pop-up screen. You can paste your CloudInit script into the "Customization Script" field.