According to this page, a Technology Preview is a feature that is currently unsupported, may not have complete functionality, and are not suitable for deployment in production. However, Red Hat provides these features and makes them available to the customer as a courtesy with the primary goal of exposing the feature to a wider audience.
I am quite often asked by my clients, which features are in tech preview for each release. Instead of spending time looking these things up each time I figured I would document them here.
Hopefully, in the near future, we will see an rpm similar to redhat-release-server (the rpm that create /etc/redhat-release) included in future OSP director updates. Until then, this table should be of some assistance.
Hey, are you installing CEPH in your test lab and you screwed it up, or something has gone wrong with your test cluster and you want to start over? Well, the instructions on how to do this are below.
Note that most of this process is actually well documented, but I added in a few extra steps good to run if you want to start from scratch without having to reinstall an OS.
First remove all CEPH rpms from your CEPH hosts, this includes Monitor nodes and OSD nodes. Note that I am in /root/ceph-deploy on my monitor/admin server. If you have separate admin and monitor nodes then run these commands from your admin node.
# ceph-deploy purge mon01 osd01 osd02 osd03
Now purge all config files.
# ceph-deploy purgedata mon01 osd01 osd02 osd03
Now remove all keys
# ceph-deploy forgetkeys
Now delete any remaining files or keys from /root/ceph-deploy, if there are any files in here that you may want to keep, just copy them to /root.
# rm -rf /root/ceph-deploy/*
Now remove Calamari. Note: that in my test lab I am running Calamari on my one MON node which also happens to be my admin node, so I run this command there