See if this helps.
* Create "ssh-config".
```
Host *
StrictHostKeyChecking no
UserKnownHostsFile /dev/null
LogLevel ERROR
```
* Add it to cephadm.
```
ceph cephadm set-ssh-config -i ssh-config
```
Then try to add host again.
Tony
> -----Original Message-----
> From: Mika Saari <mika.saari@xxxxxxxxx>
> Sent: Wednesday, November 18, 2020 11:28 AM
> To: ceph-users@xxxxxxx
> Subject: CentOS 8, Ceph Octopus, ssh private key
>
> Hi,
>
> Installing Ceph Octopus using cephadm. I managed to install ceph-
> common with cephadm and when trying to add new hosts with "ceph orch
> host add ceph2" I get error
>
> "Error EINVAL: Failed to connect to ceph2 (ceph2). Check that the host
> is reachable and accepts connection using the cephadm SSH key".
>
> I verified that I am able to ssh login to the ceph2 server with ceph
> private_key like it was described in the error message. But since adding
> new hosts to the ceph wasn't working, I tried generating the new private
> key and updating the public keys to the remote servers with:
> # ceph cephadm clear-key
> # ceph cephadm generate-key
> # ceph cephadm get-pub-key > ceph.pub
> # ceph config-key get mgr/cephadm/ssh_identity_key > ceph.priv
> # ssh-copy-id -f -i /etc/ceph/ceph.pub root@ceph1
> # ssh-copy-id -f -i /etc/ceph/ceph.pub root@ceph2
> # ssh-copy-id -f -i /etc/ceph/ceph.pub root@ceph3
> And then testing that the private key really is working:
> # chmod 600 ceph.priv
> # ssh -i ceph.priv root@ceph2
> At this point ssh works with passwordless login. But still the ceph
> orch host add ceph2 doesn't work (giving exactly the same error)
>
> I also tried restarting the manager with "ceph mgr fail" which was
> informed somewhere -> no effect. Also tried rebooting the machines -> no
> effect.
>
> Any tips I could still try ?
>
> Thank you very much!
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