This script could be a replacement for the traditional “xm” command. In HA stack if the domU is specified as Xen OCF resource it then cannot be started, stopped, migrated, managed with traditional utilities because HA simply wouldn’t know what happened to the resource. As a panic action it could reset the node where the monitor operation of the domU failed and cause further/unforeseen problems .

The script is not gonna solve your misconfigured HA issues, it really needs a well defined policy and a well working system.

It’s advised that you set up resource stickiness in HA with a score of INFINITY, I usually set up alias as well for my root account to replace the traditional xm command:

dom0:~ # echo "alias xm='/etc/xen/scripts/xm-ha'" >> ~/.bashrc
dom0:~ # source ~/.bashrc

The script could be located at /etc/xen/scripts (need that to be added to the search path also). If it’s shared (via OCFS2) all nodes will pick up changes to it instantly. (if any)

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Category: Free Tools, Technical Solutions
This entry was posted Thursday, 24 July, 2008 at 10:00 am
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Comments

  • variia says:

    Added resource failcount reset option
    Added cleanup (delete from LRM) option

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