19.03.2019 on the server with the ovirt engine, I reinstalled the GUI and it 
seemed to delete the ovirt-engine, in any case, the installed ovirt-engine 
packages were not. I reinstalled the ovirt-engine package, but could not 
connect to the web interface. There are such errors in the 

2019-03-20 11:37:12,660+09 INFO  
[org.ovirt.engine.core.extensions.mgr.ExtensionsManager] (ServerService Thread 
Pool -- 58) [] Initializing extension 'internal-authz'
2019-03-20 11:37:12,661+09 ERROR 
[org.ovirt.engine.extension.aaa.jdbc.binding.api.AuthzExtension] (ServerService 
Thread Pool -- 58) [] Unexpected Exception invoking: 
2019-03-20 11:37:12,662+09 ERROR 
[org.ovirt.engine.core.extensions.mgr.ExtensionsManager] (ServerService Thread 
Pool -- 58) [] Error in activating extension 'internal-authz': Connection 
refused. Check that the hostname and port are correct and that the postmaster 
is accepting TCP/IP connections.
2019-03-20 11:37:12,662+09 ERROR 
[org.ovirt.engine.core.sso.utils.SsoExtensionsManager] (ServerService Thread 
Pool -- 58) [] Could not initialize extension 'internal-authz'. Exception 
message is: Class: class 
2019-03-20 11:37:13,046+09 ERROR 
(ServerService Thread Pool -- 44) [] Could not access engine's DWH 
configuration table: java.sql.SQLException: javax.resource.ResourceException: 
IJ000453: Unable to get managed connection for java:/ENGINEDataSource
2019-03-20 11:37:13,049+09 WARN  
(ServerService Thread Pool -- 44) [] No valid DWH configurations were found, 
assuming DWH database isn't setup.
2019-03-20 11:37:13,049+09 INFO  
(ServerService Thread Pool -- 44) [] Dashboard DB query cache has been disabled.

CentOS 7,  3.10.0-693.2.2.el7.x86_64

I have a backup file, but version 4.1. Recovering from it using engine-backup 
is impossible.
I also have a backup /etc before deleting the ovirt-engine.

Как мне восстановить ovirt-engine?
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