[LU-8457] Pacemaker script to monitor LNet

• Type: New Feature
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.10.0
• Labels: lnet pacemaker
• Assignee: Gabriele Paciucci (Inactive)
• Reporter: Gabriele Paciucci (Inactive)

Description

A new script to be used in Pacemaker to monitor LNet compatible with ZFS and LDISKFS based Lustre server installations.

This RA is able to monitor a single LNet device using the Pacemaker's clone technology.

pcs resource create [Resource Name] ocf:pacemaker:healthLNET \
dampen=[seconds 5s] \
multiplier=[number 1000] \
lctl=[ true | false] \ 
device=[device name ib0] \ 
host_list=[ list of NIDs, space separated, if lctl is true otherwise list of IPs] \
--clone 

where:

• dampen The time to wait (dampening) further changes occur
• multiplier The number by which to multiply the number of connected ping nodes by
• attempts Number of ping attempts, per host, before declaring it dead
• timeout How long, in seconds, to wait before declaring a ping lost
• lctl Option to enable lctl ping instead of the normal ping. The default is true
• device Device used for the LNET network. We assume the same device accross the cluster

This script should be located in /usr/lib/ocf/resource.d/heartbeat/ of both the Lustre servers with permission 755.

Default values:

• dampen 5s
• multiplier 1
• attempts 3
• timeout 5s
• lctl true

Default timeout:

• start timeout 60s
• stop timeout 20s
• monitor timeout 60s interval 10s

Compatible and tested:

• pacemaker 1.1.13
• corosync 2.3.4
• pcs 0.9.143
• RHEL/CentOS 7.2

Example of procedure to configure:

pcs resource create healthLNET ocf:pacemaker:healthLNET dampen=5s multiplier=1000 lctl=true device=eth1 host_list="10.10.130.1@tcp1 10.10.130.2@tcp1" --clone 

targets=`crm_mon -1|grep 'OST'| awk '{print $1}'` 

for i in $targets; do pcs constraint location $i rule score=-INFINITY pingd lt 1 or not_defined pingd; done 

Issue Links

• is blocking: LU-9168 Add pacemaker resources to lustre rpms