![\"typo](\"https:\/\/blog.unetresgrossebite.com\/wp-content\/uploads\/2017\/07\/luminoushealth.png\")
<\/a>Small typo displaying Ceph Health, if you can notice it<\/p><\/div>\n
Noticeable changes since Luminous include CephFS being -allegedly- stable. I didn’t test it myself yet, although I’ve been hearing about that feature being unstable since my first days testing Ceph, years ago.<\/p>\n
<\/a>RadosGateway multisite sync status<\/p><\/div>\n
Another considerable change that showed up and is now considered stable, is a replacement implementation of Ceph FileStore (relying on ext4, xfs or btrfs partitions), called BlueStore. The main change being that Ceph Object Storage processes would no longer mount a large filesystem storing their data. Beware that recovery scripts reconstructing block devices scanning for PG content in OSD filesystems would no longer work – it is yet unclear how a disaster recovery would work, recovering data from an offline cluster. No surprises otherwise, so far so good.<\/p>\n
Also advertised: the RBD-mirror daemon (introduced lately) is now considered stable running in HA. From what I’ve seen, it is yet unclear how to configure HA starting several mirrors in a single cluster – I very much doubt this would work out of the box. We’ll probably have to wait a little longer, for Ceph documentation to reflect the last changes introduced on that matter.<\/p>\n
As I had 2 Ceph clusters, I could confirm RadosGW Multisite configuration works perfectly. Now that’s not a new feature, still it’s the first time I actually set this up. Buckets are eventually replicated to remote cluster. Documentation is way more exhaustive<\/a>, works as advertised: I’ll stick to this, until we learn more about RBD mirroring.<\/p>\n Ceph RestAPI Gateway<\/p><\/div>\n Freshly introduced: the Ceph RestAPI Gateway. Again, we’re missing some docs yet. On paper, this service should allow you to query your cluster as you would have with Ceph CLI tools, via a Restful API. Having set one up, it isn’t much complicated – I would recommend not to use their built-in webserver, and instead use nginx and uwsgi. The basics on that matter could be found on GitHub<\/a>.<\/p>\n Ceph health turns to warning, watch for un-scrubbed PGs<\/p><\/div>\n Even though Ceph Luminous shouldn’t reach LTS before their 12.2.0 release, as of today, I can confirm Debian Stretch packages are working relatively well on a 3-MON 3-MGR 3-OSD 2-RGW with some haproxy balancer setup, serving with s3-like buckets. Although note there is some weirdness regarding PG scrubbing, you may need to add a cron job … And if you consider running Ceph on commodity hardware, consider that their last releases may be broken<\/a>.<\/p>\n<\/a><\/a>