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Bug 2065818 - crm_resource --why should indicate when a resource is stopped due to a node's health
Summary: crm_resource --why should indicate when a resource is stopped due to a node's...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: pacemaker
Version: 8.6
Hardware: All
OS: All
medium
low
Target Milestone: rc
: 8.7
Assignee: Ken Gaillot
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-03-18 19:46 UTC by Ken Gaillot
Modified: 2022-11-15 14:56 UTC (History)
4 users (show)

Fixed In Version: pacemaker-2.1.4-4.el8
Doc Type: Enhancement
Doc Text:
Feature: The crm_resource command's --why option, and pcs resource cleanup, now indicate when a resource remains stopped on a node due to the node's health being degraded. Reason: If a user runs "pcs resource cleanup" for a resource, and the resource is still not running, it can be confusing as to what to look at next. The command would already indicate a few common conditions like the resource being disabled, but there would be no indication if the resource remained stopped because the node's health was degraded. Result: It is now easier to tell what to investigate if a resource is stopped due to a node's health being degraded.
Clone Of:
Environment:
Last Closed: 2022-11-08 09:42:30 UTC
Type: Feature Request
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-116156 0 None None None 2022-03-18 19:51:57 UTC
Red Hat Knowledge Base (Solution) 6985482 0 None None None 2022-11-15 14:56:52 UTC
Red Hat Product Errata RHBA-2022:7573 0 None None None 2022-11-08 09:42:40 UTC

Description Ken Gaillot 2022-03-18 19:46:14 UTC 
Description of problem: Pacemaker's crm_resource command has a --why option to give some human-friendly reason why a particular resource is stopped. It currently handles a limited number of conditions, including target-role and whether the resource is managed or shutdown-locked. If a node is given on the command line (which is optional), the command should also check for whether the node is currently banned due to health status; if no node is given, the command could check whether all of the resource's allowed nodes are banned, but that might be overkill and nontrivial to implement.


Steps to Reproduce:
1. Configure and start a cluster.
2. Enable node health monitoring, for example: pcs property set node-health-strategy="migrate-on-red"
3. Configure a resource and ban it from all nodes except one
4. Simulate a node health monitor detecting a degraded condition by setting a node attribute appropriately for the node running the test resource, for example (replacing node name as appropriate): pcs node attribute $NODE '#health-test=red'
5. On any node, run (replacing resource and node names as appropriate): crm_resource --why --resource $RESOURCE --node $NODE

Actual results: A message saying only that "Resource dummy is not running on host $NODE"

Expected results: An additional line explaining why, something like "$NODE health score is $N (red) and node-health-strategy=migrate-on-red"

Additional info: pcs resource cleanup/refresh $RESOURCE uses the same code to show a reason if the resource remains stopped after the cleanup, so its output should be updated too
Comment 2 Ken Gaillot 2022-07-07 15:08:09 UTC 
Fixed in upstream main branch as of commit 6630e55
Comment 6 jrehova 2022-08-04 12:19:25 UTC 
* 2-node cluster

Version of pacemaker:

> [root@virt-008 ~]# rpm -q pacemaker
> pacemaker-2.1.4-4.el8.x86_64

Enabling node health monitoring:

> [root@virt-008 ~]# pcs property set node-health-strategy="migrate-on-red"
> [root@virt-008 ~]# pcs property
> Cluster Properties:
>  cluster-infrastructure: corosync
>  cluster-name: STSRHTS26647
>  dc-version: 2.1.4-4.el8-dc6eb4362e
>  have-watchdog: false
>  node-health-strategy: migrate-on-red

Create a resource:

> [root@virt-008 ~]# pcs resource create resource_dummy ocf:pacemaker:Dummy
> [root@virt-008 ~]# pcs status
> Cluster name: STSRHTS26647
> Cluster Summary:
>   * Stack: corosync
>   * Current DC: virt-008 (version 2.1.4-4.el8-dc6eb4362e) - partition with quorum
>   * Last updated: Wed Aug  3 16:58:06 2022
>   * Last change:  Wed Aug  3 16:58:00 2022 by root via cibadmin on virt-008
>   * 2 nodes configured
>   * 3 resource instances configured
> 
> Node List:
>   * Online: [ virt-008 virt-009 ]
> 
> Full List of Resources:
>   * fence-virt-008  (stonith:fence_xvm):     Started virt-008
>   * fence-virt-009  (stonith:fence_xvm):     Started virt-009
>   * resource_dummy  (ocf::pacemaker:Dummy):  Started virt-008
> 
> Daemon Status:
>   corosync: active/disabled
>   pacemaker: active/disabled
>   pcsd: active/enabled

Simulating a node health degraded condition:

> [root@virt-008 ~]# pcs node attribute virt-008 '#health-test=red'

Result message:

> [root@virt-008 ~]# crm_resource --why --resource resource_dummy --node virt-008
> Resource resource_dummy is not running on host virt-008
> 'resource_dummy' cannot run on unhealthy nodes due to node-health-strategy='migrate-on-red'
Comment 8 errata-xmlrpc 2022-11-08 09:42:30 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (pacemaker bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7573
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