[sheepdog-users] Running instances and snapshots
Andrew J. Hobbs
ajhobbs at desu.edu
Fri Jul 5 15:39:39 CEST 2013
Perhaps I'm missing something, but if I try to use:
qemu-img snapshot -c test someimg
My image then goes into read-only mode. Is there a way to snapshot a running image without entering into this read-only mode?
3 sheepdog nodes running 0.6.0_71_g7ccce0d, 2 are running 1.4.0 (Debian 1.4.0+dfsg-1expubuntu4), one is running a self-compiled 1.5.1.
I have two running instances on the nodes, one with qcow2 image, the other with a raw image in sheepdog.
My interest lies in uptime for the webserver instances. I can cheerfully migrate the instance among the machines without issue, the next part would be being able to snapshot backup the instances without outage.
/usr/sbin/sheep -c zookeeper:10.254.0.1:2181,10.254.0.2:2181,10.254.0.3:2181 -j dir=/var/lib/sheepjournal,size=1024 -w size=60000,dir=/var/lib/sheepcache -y 10.254.0.1 /var/lib/sheepdog
/var/lib/sheepjournal is on a SSD OS boot drive. /var/lib/sheepcache is on an SSD partition. /var/lib/sheepdog is a 1 TB drive. Using zookeeper as nodes are in different buildings, and multicast is not enabled on our switches.
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