CloudStack#

Apache CloudStack expose user-data, meta-data, user password and account SSH key thru the Virtual-Router. The datasource obtains the VR address via dhcp lease information given to the instance. For more details on meta-data and user-data, refer the CloudStack Administrator Guide.

URLs to access user-data and meta-data from the Virtual Machine. data-server. is a well-known hostname provided by the CloudStack virtual router that points to the next UserData server (which is usually also the virtual router).

http://data-server./latest/user-data
http://data-server./latest/meta-data
http://data-server./latest/meta-data/{metadata type}

If data-server. cannot be resolved, cloud-init will try to obtain the virtual router’s address from the system’s DHCP leases. If that fails, it will use the system’s default gateway.

Configuration#

The following configuration can be set for the datasource in system configuration (in /etc/cloud/cloud.cfg or /etc/cloud/cloud.cfg.d/).

The settings that may be configured are:

  • max_wait: the maximum amount of clock time in seconds that should be spent searching metadata_urls. A value less than zero will result in only one request being made, to the first in the list. (default: 120)

  • timeout: the timeout value provided to urlopen for each individual http request. This is used both when selecting a metadata_url and when crawling the metadata service. (default: 50)

An example configuration with the default values is provided below:

datasource:
  CloudStack:
    max_wait: 120
    timeout: 50