Hello Hanson,
Below is the procedure to replace the host with same FQDN where
existing host OS has to be re-installed. If the ovirt version you are
running is 4.0, steps 14 and 15 are not required. You could reinstall
the host from UI with HostedEngine->Deploy option.
*
1.
Move host (host3) to maintenance in UI
2.
Re-install OS, subscribe to channels & install required packages,
prepare bricks (if needed)
3.
Check gluster peer status from working node to obtain UUID of host
being replaced
4.
Create brick directories by running the command “mkdir /rhgs/brick{1..3}
5.
Put /etc/fstab entries in the new node by copying it from other nodes.
6.
Run mount -a so that bricks are mounted.
7.
Edit gluster UUID in /var/lib/glusterd/glusterd.info
8.
Copy peer info from a working peer to /var/lib/glusterd/peers
(without the peer info of node being replaced, here host3)
9.
Create and remove a tmp dir at all volume mount points
10.
Run the command “setfattr -n trusted.non-existent-key -v abc <mount
point>” to set extended attributes and remove the extended attribute
by running the command “ setfattr -x trusted.non-existent-key <mount
point>” at all mount points.
11.
Restart glusterd
12.
Ensure heal is in progress and complete
13.
Edit the host, and fetch fingerprint in Advanced details - as
fingerprint is changed due to reinstallation
14.
Run “hosted-engine --deploy --config-append=answers.conf” on host3
(Should be seen as additional host setup, provide the host number as
known by other hosts)
15.
hosted-engine deploy fails as the host being installed cannot be
added to the engine with hostname already known error. Reinstalling
from the UI and aborting HE setup seems to fix this. ovirt-ha-agent
and ovirt-ha-broker services had to be started manually
1.
Go to UI and click on reinstall button to reinstall the host.
Reinstalling host might fail due not able to configure
management network.
2.
Go to Network Interfaces tab and click on “Setup Host Networks”
and assign the networks ovirtmgmt and glusternw to the correct nics.
3.
Wait for sometime for the Node to come up and start
ovirt-ha-agent and ovirt-ha-broker services.
*
Thanks
kasturi.
On 09/20/2016 11:27 AM, knarra wrote:
Hi,
Pad [1] contains the procedure to replace the host with same FQDN
where existing host OS has to be re-installed.
[1] https://paste.fedoraproject.org/431252/47435076/
Thanks
kasturi.
On 09/20/2016 06:27 AM, Hanson wrote:
Hi Guys,
I encountered an unfortunate circumstance today. Possibly an
achillies heel.
I have three hypervisors, HV1, HV2, HV3, all running gluster for
hosted engine support. Individually they all pointed to
HV1:/hosted_engine with backupvol=HV2,HV3...
HV1 lost its bootsector, which was discovered upon a reboot. This had
zero impact, as designed, on the VM's.
However, now that HV1 is down, how does one go about replacing the
original HV? The backup servers point to HV1, and you cannot readd
the HV through the GUI, and the CLI will not readd it as it's already
there... you cannot remove it as it is down in the GUI...
Pointing the other HV's to their own storage may make sense for
multiple instances of the hosted_engine, however it's nice that the
gluster volumes are replicated and that one VM can be relaunched when
a HV error is detected. It's also consuming less resources.
What's the procedure to replace the original VM?
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