Application disappear from application list, but host always exists - cloudify

Question

I have a problem that my application "zdaas" installed by cloudify, it has been worked well for a long time, but today, I find the applicaton "zdaas" is disappearing from application commbox(attachment picture 1), but in the host tab, the machine and usm gsa etc exist normally(picture 2)
then I use Admin to restart GSM, and the result is the application tab has nothing appeared(picture 3).
To solve this problem, I try to restart the management, but the problem always exists
At last, I teardown the cloudify, and reinstall "zdaas". But if my application is running in product enviroment(it works very well), it didnot allow me to teardown.
so, how can I resolve this problem?
Thank you very much!
![enter image description here][1]
![enter image description here][2]
![enter image description here][3]
https: //cloudifysource.zendesk.com/attachments/token/DjjxOBl6CIfPLda5fMpGrI67z/?name=1.png
https: //cloudifysource.zendesk.com/attachments/token/DjjxOBl6CIfPLda5fMpGrI67z/?name=2.png
https: //cloudifysource.zendesk.com/attachments/token/DjjxOBl6CIfPLda5fMpGrI67z/?name=3.png

Answer 1

From the screenshots you sent, it looks like you are using a single Cloudify manager. If it is running without persistence (not saving state to disk) then a restart of the Cloudify Manager host would cause all manager state to be lost.
After such a restart, the agent VMs would reconnect to the manager so you would still see them on the hosts page, but the state of installed services would be lost.
It is recommended to run Cloudify in production with two managers running in a highly-available cluster, so that the failure of any one machine will not cause data loss.
To set the Cloudify manager to run with HA, edit your *-cloud groovy file, and set the numberOfManagementMachines field to a value of 2. When you bootstrap cloudify with this value, 2 manager machines will be started up. Both machines are active, and each backs up the other's data.
cloud {
...
provider {
...
numberOfManagementMachines 2
}
}