On 2/27/12 5:49 PM, Lars Ellenberg wrote: > On Mon, Feb 27, 2012 at 05:41:09PM -0500, William Seligman wrote: >>>>> is this not *the* use case of globally-unique=true? >>>> >>>> I did not know about globally-unique. I just tested it, replacing (with >>>> name >>>> substitutions): >>>> >>>> clone ipaddr2_clone ipaddr2_resource meta notify="true" >>>> >>>> with >>>> >>>> clone ipaddr2_clone ipaddr2_resource meta globally-unique="true" >>>> >>>> This fell back to the old behavior I described in the first message in this >>>> thread: iptables did not update when I took down one of my nodes. >>>> >>>> I expected this, since according to "Pacemaker Explained", >>>> globally-unique="true" is the default. If this had worked, I never would >>>> have >>>> reported the problem in the first place. >>>> >>>> Is there something else that could suppress the behavior you described for >>>> globally-unique=true? >>>> >>> >>> You need clone-node-max == clone-max. >>> >>> It defaults to 1. >>> >>> Which obviously prevents nodes already running one >>> instance from taking over an other... >> >> I tried it, and it works. So there's no need for my patch. The magic >> invocation >> for a highly-available IPaddr2 resource is: >> >> ip_clone ip_resource meta clone-max=2 clone-node-max=2 > > Note that, if you have more than two nodes, to get more evenly > distributed buckets in the case of failover, you can also specify larger > numbers than you have nodes. In which case by default, all nodes would > run several. And in case of failover, each remaining node should > takeover it's share. > >> Could this please be documented more clearly somewhere? > > Clusters from Scratch not good enought? > > http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/ch08s06.html
Drat and darnit, somehow I missed that page! Mea maxima culpa. > But yes, I'll add a note to the IPaddr2 meta data > where the long desc talks about cluster IP usage... > > -- Bill Seligman | Phone: (914) 591-2823 Nevis Labs, Columbia Univ | mailto://[email protected] PO Box 137 | Irvington NY 10533 USA | http://www.nevis.columbia.edu/~seligman/
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