Signaling container

Registered by Duong Ha-Quang

For services which support graceful shutdown by sending it unix signal, we should stop it by send the signal and wait for a while.
(Currently, we stop it immediately).

Also, lib like oslo.log provides signal handler to zero-downtime reload configuration.

In general, we should support signaling container if it is supported.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Duong Ha-Quang
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Slow progress
Milestone target:
None
Started by
Duong Ha-Quang

Related branches

Sprints

Whiteboard

Currently, there are 2 cases for this bp:
- graceful shutdown
- zero-downtime reload configuration

Gerrit topic: https://review.openstack.org/#q,topic:bp/signaling-to-container,n,z

Addressed by: https://review.openstack.org/453055
    Add graceful_timeout argument to kolla_docker

(?)

Work Items

Work items:
[duonghq] graceful shutdown: INPROGRESS
zero-downtime reload configuration: TODO

Dependency tree

* Blueprints in grey have been implemented.

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