Hi. On Tue, Jan 30, 2024 at 5:24 PM duluxoz <duluxoz@xxxxxxxxx> wrote: > > Hi All, > > Quick Q: How easy/hard is it to change the IP networks of: > > 1) A Ceph Cluster's "Front-End" Network? This is hard, but doable. The problem is that the MON database contains the expected addresses of all MONs, and therefore, you cannot just change them. What you can do is: * Make sure that routing between the old network and the new one is functional * Set at least "noout" * Change the cluster config so that it lists two public networks (old and new) * Remove one MON * Adjust ceph.conf on all MONs to point it to the new MON address * Add a new MON on the new network, wait for it to join the quorum * Repeat the process for other MONs, one by one * Do another rolling restart of all MONs with the correct ceph.conf, just for good measure Then change the network config and ceph.conf on OSD nodes and clients. > 2) A Ceph Cluster's "Back-End" Network? I have never tried this. In fact, any cluster that has a back-end network not over the same physical interfaces as the front-end network will not pass my audit. VLANs are OK. A failure of a back-end network card on a single OSD would put the whole cluster to a halt. The problem is described at https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-osd/#flapping-osds > > Is it a "simply" matter of: > > a) Placing the Nodes in maintenance mode > > b) Changing a config file (I assume it's /etc/ceph/ceph.conf) on each Node > > c) Rebooting the Nodes > > d) Taking each Node out of Maintenance Mode > > Thanks in advance > > Cheers > > Dulux-Oz > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx -- Alexander E. Patrakov _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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