I have a fresh ceph 14.2.1 cluster up and running based on Ubuntu 18.04. It consists of 9 hosts (+1 admin host). The nine hosts have each 16 ceph-osd daemons running, three in these nine hosts also have a ceph-mon and a ceph-mgr daemon running. So three hosts are running osd, mon and also mgr daemons. Now I am unsure about the right way to go for ceph upgrades and linux system host updates. Ceph-Upgrade: Reading the ceph upgrade docs I ask myself how a future upgrade say to 14.2.2 should be performed correctly? The recommendation says to upgrade first monitors, then osds etc... So what is the correct way to go in a mixed setup like mine? Following the rules strictly would mean not to use ceph-deploy install, but instead to log into the mon(/osd) hosts and then upgrade only the ceph-mon package and restart this mon, and then do the same with the other monitors/osd hosts. After all mons have been successfully upgraded I should then continue with upgrading OSDs (ceph-osd package) on one host and restart all osds on this host one after another or reboot the whole host. Then proceed to the next osd-host. Is this the correct and best way to go? Linux system updates: The second point I would like to hear your opinions about is how you handle linux system updates? Since even a non ceph linux system package update might break ceph or even stop the whole linux host from booting, care has to be taken. So how do you handle this problem? Do you run host upgrades only manually in a fixed sequence eg first on a osd/mon host and if the update is successful, then run the linux system package updates on the other hosts? Do you use another strategy? Thanks Rainer -- Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1 56070 Koblenz, Tel: +49261287 1312 Fax +49261287 100 1312 Web: http://userpages.uni-koblenz.de/~krienke PGP: http://userpages.uni-koblenz.de/~krienke/mypgp.html _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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