worker/machiner: juju should exclude machines that have failed presence checks
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| juju-core |
Triaged
|
High
|
Unassigned | ||
Bug Description
Scenario:
Customer has used juju add-machine to enroll all their maas nodes * into their juju environment.
During this process one or more of the machines crashed, but a machine record exists for it, so it appears as 'unallocated' in juju status.
That dead machine will attract units made with add-unit / deploy yet never be able to provision them, nor can units that land on these zombie machines be removed, see lp#1206532.
Proposal:
Juju should consider the agent presence status at the point in time it tries to find a free machine to allocate the unit too. Machines which are currently failing presence would be excluded.
* in the exact scenario, this was so they could use add-unit --to to work around the lack of maas tags, but the underlying problem is applicable without this fact.
