Hi,
For new clusters one of the first things I do is to disable messenger v1:
ceph config set mon ms_bind_msgr1 false
However, that is not enough, as a restart of the monitors will leave v1
enabled in the monmap. Why is that? That looks like a bug to me.
Therefore I explicitly set the addrs and port of the monitors, i.e.:
ceph mon set-addrs stefan-ceph-test01 $ip:3300
Be careful not to make a typo, that will ruin your day, see [1].
This immediately disables v1 and a new monmap is created.
All good, however ...
When a monitor is removed, say mon1, and added again, the new mon is
added with both a v1 and a v2 address. I don't want that, I want to
disable legacy v1 permanently. How do I do that?
Adding:
[mon]
ms_bind_msgr1 = false
to /etc/ceph/ceph.conf does not help either.
When I performed a test this morning on a fresh 18.2.4 cluster (remove a
mon, add it back again) to reproduce this issue the v1 was enabled again
on two monitors (a third was left with only v2).
Repeating the "ceph mon set-addrs" command removes the v1 binding again.
But I would like to avoid messing around with this, triggering monmaps /
elections, especially when making an error with this brings your cluster
to a halt [1].
In what Ceph release will v1 be disabled by default on new clusters?
Gr. Stefan
[1] https://tracker.ceph.com/issues/54744
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