Red Hat Bugzilla – Bug 1364167
[ceph-ansible] role ceph-common disables swap by default
Last modified: 2017-03-14 11:50:39 EDT
Description of problem ====================== Right now, `ceph-common` role disables swap by default and I believe that this should no be there because swap configuration is out of scope for ceph-ansible. Version-Release =============== ceph-ansible-1.0.5-31.el7scon.noarch How reproducible ================ 100 % Steps to Reproduce ================== 1. Install RHSC 2.0 following the documentation. 2. Accept few nodes *with swap enabled* for the ceph cluster. 3. Create new ceph cluster named 'alpha'. 4. Check swap status on all machines of the cluster. Actual results ============== Swap has been disabled on all OSD machines: ~~~ $ ansible -i mbukatov-usm1.hosts -m shell -a 'free -m | grep Swap' all mbukatov-usm1-mon1.example.com | SUCCESS | rc=0 >> Swap: 2047 0 2047 mbukatov-usm1-mon2.example.com | SUCCESS | rc=0 >> Swap: 2047 0 2047 mbukatov-usm1-node1.example.com | SUCCESS | rc=0 >> Swap: 0 0 0 mbukatov-usm1-node4.example.com | SUCCESS | rc=0 >> Swap: 0 0 0 mbukatov-usm1-node3.example.com | SUCCESS | rc=0 >> Swap: 0 0 0 mbukatov-usm1-node2.example.com | SUCCESS | rc=0 >> Swap: 0 0 0 mbukatov-usm1-server.example.com | SUCCESS | rc=0 >> Swap: 2047 0 2047 mbukatov-usm1-mon3.example.com | SUCCESS | rc=0 >> Swap: 2047 0 2047 ~~~ When I reboot the machines, the swap is enabled again. Expected results ================ The swap configuration is not changed by ceph-ansible. Additional info =============== Swap is usually configured by admin when the system is installed/deployed (since you need to create and enable swap partition), so when admin decides to deploy machines with swap, it doesn't make sense to override this decision in ceph-common role. When one needs to disable swap, it should be done on a deployment level, not in ceph-ansible. Moreover I'm not familiar with any ceph recommendations not to use swap. I noticed that this has been introduced in this commit: https://github.com/ceph/ceph-ansible/commit/c246d8dc806f7b9a713b30010e436fac5a79ad71 The the defauls was fixed in: https://github.com/ceph/ceph-ansible/commit/4dad21c481de9f73f2f8308db0e00906b59f35b1
Additional info =============== After discussing this issue upstream, my pull request removing the feature was merged, see: https://github.com/ceph/ceph-ansible/issues/919
This will ship concurrently with RHCS 2.1.
Andrew, would you please fill out the doc type and doc text field to give the Docs team some input?
Verified this in version: ceph-ansible-2.1.6-1.el7scon.noarch I enabled swap on few nodes before running ansible playbook. Even after the swap space was not affected.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:0515