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katello-attach-subscription

automatically assign subscriptions to hypervisors based on certain rules

Description

katello-attach-subscription can be used to attach specific subscriptions to Katello hosts in Satellite 6. It is needed when you have multiple subscriptions that can be given to your hypervisors but want a more granular assignment than done by default by Satellite 6. You could for example give a specific subscription to a set of hosts that match a common hostname pattern or were submitted by a specific virt-who instance.

When run, katello-attach-subscription will execute the following steps:

  • Iterate over all content hosts of type Hypervisor of your organization
  • Search for a subscription that matches by hostname and (optionally) by the submitter (usually identified by the UUID of the virt-who instance)
  • If such a subscription is found:
    • ensure that it is attached to the content host
    • and all other subscriptions are removed from it

Requirements

Options

  • -U, --uri=URI URI to the Satellite, this must be https
  • -u, --user=USER User to log in to Satellite
  • -p, --pass=PASS Password to log in to Satellite
  • -o, --organization-id=ID ID of the Organization
  • -c, --config=FILE configuration in YAML format
  • -n, --noop do not actually execute anything
  • -H, --used-hypervisors-only only search for hypervisors that are in use
  • -s, --search=SEARCH only search for hypervisors that are in use
  • --use-cache read systems from the cache
  • --cache-file=FILE set the cache file for reading and writing
  • -d, --debug show debug code during execution

Configuration

katello-attach-subscription can be configured using an YAML file (katello-attach-subscription.yaml by default).

The configuration file consists of two main sections: settings and subs.

The settings section allows to set the same details as the commandline options. Any options given on the command line will override the respective config file settings.

:settings:
  :user: admin
  :pass: changeme
  :uri: https://localhost
  :org: 1
  :cachefile: 'katello-attach-subscription.cache'

The cachefile is meant to run this program in a faster way because retrieving all of the systems can require huge time. The cachefile will be written each time, while if --use-cache is specified on command line it will be readed and will skip systems extraction.

The subs section is an array of hashes which describe the subscriptions to be attached. Each subscription hash has an hostname entry which will be used as an regular expression to match the hostname of the content host in Katello. It also has a sub entry, which is an hash of array. The hash has product as key, which is a string to identify the type of subscription, and the content is an array of RedHat Pool ID of subscription to be attached to the host.

:subs:
  -
    hostname: esxi[0-9]\.example\.com
    sub:
      rhel:
        - 4543828edcf35158c30abc3554c1e36a
        - 5543828edcf35158c30abc3554c1e36b
      jboss:
        - 6543828edcf35158c30abc3554c1e36c
        - 7543828edcf35158c30abc3554c1e36d
      satellite:
        - 7543828edcf35158c30abc3554c1e36e
  -
    hostname: esxi123\.example\.com
    sub:
      rhel:
        - 4543828edcf35158c30abc3554c1e36a
  -
    hostname: machine01\.example.com
    type: System
    sub:
      rhel:
        - b9548e4c9fa20b85f264fbaa2470b726

Permissions

The following permissions are required to run katello-attach-subscription:

Resource Permissions
Fact Value view_facts
Host view_hosts, edit_hosts
Subscription view_subscriptions, attach_subscriptions, unattach_subscriptions

Caveats

Currently Satellite is not able to save fact that contain the socket number. Candlepin 2.0 (bug to be linked) and Virt-who 0.16 are needed https://bugzilla.redhat.com/show_bug.cgi?id=1307024. Assumption that only 1 sub is needed is done currently.

INSTANCE_MULTIPLIER WORKAROUND BZ 1664614

Due to this bug, we had to do a manual check of the subscription to attach on the host in order to calculate the correct value of instance_multiplier.

Description of problem:

Output provided by this 2 Satellite API calls:

GET /katello/api/organizations/:organization_id/subscriptions/:id
GET /katello/api/subscriptions/:id

return instance_multiplier with value always set to 1.

This is incorrect as subscriptions like RHEL Premium for Physical or Virtual Nodes requires to be attached with a quantity that is multiple of 2.

The correct value is retrieved by calling GET /katello/api/organizations/:organization_id/subscriptions API passing as parameters:

:available_for = "host"
:host_id = <the id of the host we need to attach>

Tests that were made using various type of subscriptions and return that:

A. These subs has 1 as instance_multiplier

  • VDC Subs (VDC RHEL, VDC ESL and VDC Smart Management) that would be attached on an Hypervisor
  • VDC Subs that would be attached on a virtual server that is on Fully Entitled Hypervisor
  • Self-support subscriptions for physical or virtual nodes as "Red Hat Enterprise Linux Server Entry Level, Self-support", "Red Hat Enterprise Linux Server for HPC Compute Node, Self-support (1-2 sockets) (Up to 1 guest)" and "Smart Management for Red Hat Enterprise Linux Server for HPC Compute Node (Up to 1 guest)"

B. These subs has 2 as instance_multiplier:

  • "Red Hat Enterprise Linux Server, Standard (Physical or Virtual Nodes)"
  • "Red Hat Enterprise Linux Server, Premium (Physical or Virtual Nodes)"
  • "Smart Management"
  • "Red Hat Enterprise Linux Extended Life Cycle Support (Physical or Virtual Nodes)"

The workaorund code simply checks if the host is Physical and need to attach one of the subscriptions in the B list, as only Physical servers may need instance_multiplier 2. Hypervisor's subscriptions has instance_multiplier set to 1 and Virtual Guest need only 1 sub (fixed value)