Hi,

you can specify a customized ceph.conf before the 'cephadm bootstrap' command [1] to add a dedicated cluster network (if you really need that, it has been discussed extensively on the list):

---snip---
octo1:~ # cat <<EOF > /root/ceph.conf
[global]
public network = 192.168.124.0/24
cluster network = 192.168.127.0/24
EOF


octo1:~ # cephadm bootstrap -c /root/ceph.conf --mon-ip 192.168.124.5
[...]
---snip---


After you deployed the OSDs they should be attached to the cluster network:

---snip---
octo1:~ # ceph osd metadata 0 | grep addr
"back_addr": "[v2:192.168.127.11:6800/4272275002,v1:192.168.127.11:6801/4272275002]", "front_addr": "[v2:192.168.124.5:6802/4272275002,v1:192.168.124.5:6803/4272275002]", "hb_back_addr": "[v2:192.168.127.11:6802/4272275002,v1:192.168.127.11:6803/4272275002]", "hb_front_addr": "[v2:192.168.124.5:6804/4272275002,v1:192.168.124.5:6805/4272275002]",
---snip---


You should see the replication traffic on the respective interfaces.

Regards,
Eugen


[1] https://docs.ceph.com/docs/octopus/cephadm/operations/#etc-ceph-ceph-conf


Zitat von Suresh Rama <sstk...@gmail.com>:

This should give you the answer to your question
https://docs.ceph.com/docs/master/rados/configuration/network-config-ref/

Regards,
Suresh

On Sun, Jun 7, 2020, 5:10 AM <jimmy.sp...@waochurch.com> wrote:

I am new to Ceph so I hope this is not a question of me not reading the
documentation well enough.

I have setup a small cluster to learn with three physical hosts each with
two nics.

The cluster is upp and running but I have not figured out how to tie the
OSD:s to my second interface for a separate cluster network, as it is now
all communication goes thru the public network.

Is it possible to define the cluster network with cephadm in some way?

/Jimmy
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