Actually, I think I've found the most detailed error in 
/var/log/ovirt-engine/engine.log.  It occurs at exactly the time the webui 
errors ("Failed to configure management network on host"):

2019-06-16 23:16:47,888+01 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataAfterInstallationVDSCommand]
 (EE-ManagedThreadFactory-engine-Thread-1) [dd6ed2d] Failed in 
'CollectVdsNetworkDataAfterInstallationVDS' method, for vds: 'host'; host: 
'host.example.com': CallableStatementCallback; SQL [{call insertnameserver(?, 
?, ?)}ERROR: duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement
2019-06-16 23:16:47,888+01 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataAfterInstallationVDSCommand]
 (EE-ManagedThreadFactory-engine-Thread-1) [dd6ed2d] Command 
'CollectVdsNetworkDataAfterInstallationVDSCommand(HostName = host, 
CollectHostNetworkDataVdsCommandParameters:{hostId='5e4bbac0-a0b4-458f-bb9e-f959efaf810f',
 vds='Host[host,5e4bbac0-a0b4-458f-bb9e-f959efaf810f]'})' execution failed: 
CallableStatementCallback; SQL [{call insertnameserver(?, ?, ?)}ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement
2019-06-16 23:16:47,888+01 ERROR 
[org.ovirt.engine.core.bll.hostdeploy.InstallVdsInternalCommand] 
(EE-ManagedThreadFactory-engine-Thread-1) [dd6ed2d] Exception: 
org.ovirt.engine.core.common.errors.EngineException: EngineException: 
org.springframework.dao.DuplicateKeyException: CallableStatementCallback; SQL 
[{call insertnameserver(?, ?, ?)}ERROR: duplicate key value violates unique 
constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement (Failed with error ENGINE and code 5001)
        at 
org.ovirt.engine.core.bll.VdsHandler.handleVdsResult(VdsHandler.java:118) 
[bll.jar:]
        at 
org.ovirt.engine.core.bll.VDSBrokerFrontendImpl.runVdsCommand(VDSBrokerFrontendImpl.java:33)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.network.NetworkConfigurator.refreshNetworkConfiguration(NetworkConfigurator.java:129)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.hostdeploy.InstallVdsInternalCommand.configureManagementNetwork(InstallVdsInternalCommand.java:304)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.hostdeploy.InstallVdsInternalCommand.installHost(InstallVdsInternalCommand.java:217)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.hostdeploy.InstallVdsInternalCommand.executeCommand(InstallVdsInternalCommand.java:112)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.CommandBase.executeWithoutTransaction(CommandBase.java:1157)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.CommandBase.executeActionInTransactionScope(CommandBase.java:1315)
 [bll.jar:]
        at 
org.ovirt.engine.core.bll.CommandBase.runInTransaction(CommandBase.java:1964) 
[bll.jar:]
        at 
org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInSuppressed(TransactionSupport.java:164)
 [utils.jar:]
        at 
org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInScope(TransactionSupport.java:103)
 [utils.jar:]
        at org.ovirt.engine.core.bll.CommandBase.execute(CommandBase.java:1375) 
[bll.jar:]
        at 
org.ovirt.engine.core.bll.CommandBase.executeAction(CommandBase.java:419) 
[bll.jar:]
        at 
org.ovirt.engine.core.bll.executor.DefaultBackendActionExecutor.execute(DefaultBackendActionExecutor.java:13)
 [bll.jar:]
        at org.ovirt.engine.core.bll.Backend.runAction(Backend.java:451) 
[bll.jar:]
        at org.ovirt.engine.core.bll.Backend.runActionImpl(Backend.java:433) 
[bll.jar:]
        at 
org.ovirt.engine.core.bll.Backend.runInternalAction(Backend.java:639) [bll.jar:]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [rt.jar:1.8.0_212]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_212]
        at 
org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
        at 
org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.delegateInterception(Jsr299BindingsInterceptor.java:79)
        at 
org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:89)
        at 
org.jboss.as.weld.interceptors.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:102)
        at 
org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
 [wildfly-ee-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:40)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
        at 
org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:216) 
[wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.as.ejb3.tx.CMTTxInterceptor.supports(CMTTxInterceptor.java:418) 
[wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:148)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:509)
        at 
org.jboss.weld.module.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:81)
 [weld-ejb-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:89)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:47)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:67)
 [wildfly-ejb3-15.0.1.Final.jar:15.0.1.Final]
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:60)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:438)
        at 
org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:618)
        at 
org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:57)
        at 
org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:422)
        at 
org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:53)
        at 
org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:198)
        at 
org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)
        at 
org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:81)
        at 
org.ovirt.engine.core.bll.interfaces.BackendInternal$$$view2.runInternalAction(Unknown
 Source) [bll.jar:]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [rt.jar:1.8.0_212]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_212]
        at 
org.jboss.weld.util.reflection.Reflections.invokeAndUnwrap(Reflections.java:410)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.module.ejb.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:134)
 [weld-ejb-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.module.ejb.InjectionPointPropagatingEnterpriseTargetBeanInstance.invoke(InjectionPointPropagatingEnterpriseTargetBeanInstance.java:68)
 [weld-ejb-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.ovirt.engine.core.bll.BackendCommandObjectsHandler$BackendInternal$BackendLocal$2049259618$Proxy$_$$_Weld$EnterpriseProxy$.runInternalAction(Unknown
 Source) [bll.jar:]
        at 
org.ovirt.engine.core.bll.CommandBase.runInternalAction(CommandBase.java:2354) 
[bll.jar:]
        at 
org.ovirt.engine.core.bll.hostdeploy.AddVdsCommand.lambda$executeCommand$2(AddVdsCommand.java:217)
 [bll.jar:]
        at 
org.ovirt.engine.core.utils.threadpool.ThreadPoolUtil$InternalWrapperRunnable.run(ThreadPoolUtil.java:96)
 [utils.jar:]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[rt.jar:1.8.0_212]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
[rt.jar:1.8.0_212]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
[rt.jar:1.8.0_212]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
[rt.jar:1.8.0_212]
        at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_212]
        at 
org.glassfish.enterprise.concurrent.ManagedThreadFactoryImpl$ManagedThread.run(ManagedThreadFactoryImpl.java:250)
 [javax.enterprise.concurrent-1.0.jar:]
        at 
org.jboss.as.ee.concurrent.service.ElytronManagedThreadFactory$ElytronManagedThread.run(ElytronManagedThreadFactory.java:78)
Caused by: org.springframework.dao.DuplicateKeyException: 
CallableStatementCallback; SQL [{call insertnameserver(?, ?, ?)}ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement; nested exception is org.postgresql.util.PSQLException: ERROR: 
duplicate key value violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement
        at 
org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:243)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1402)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:1065) 
[spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.JdbcTemplate.call(JdbcTemplate.java:1104) 
[spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.simple.AbstractJdbcCall.executeCallInternal(AbstractJdbcCall.java:414)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.simple.AbstractJdbcCall.doExecute(AbstractJdbcCall.java:374)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.simple.SimpleJdbcCall.execute(SimpleJdbcCall.java:198)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.ovirt.engine.core.dal.dbbroker.SimpleJdbcCallsHandler.executeImpl(SimpleJdbcCallsHandler.java:135)
 [dal.jar:]
        at 
org.ovirt.engine.core.dal.dbbroker.SimpleJdbcCallsHandler.executeImpl(SimpleJdbcCallsHandler.java:130)
 [dal.jar:]
        at 
org.ovirt.engine.core.dal.dbbroker.SimpleJdbcCallsHandler.executeModification(SimpleJdbcCallsHandler.java:76)
 [dal.jar:]
        at 
org.ovirt.engine.core.dao.network.DnsResolverConfigurationDaoImpl.saveNameServersByDnsResolverConfigurationId(DnsResolverConfigurationDaoImpl.java:66)
 [dal.jar:]
        at 
org.ovirt.engine.core.dao.network.DnsResolverConfigurationDaoImpl.save(DnsResolverConfigurationDaoImpl.java:99)
 [dal.jar:]
        at 
org.ovirt.engine.core.dao.network.DnsResolverConfigurationDaoImpl.save(DnsResolverConfigurationDaoImpl.java:15)
 [dal.jar:]
        at 
org.ovirt.engine.core.dao.VdsDynamicDaoImpl.updateDnsResolverConfiguration(VdsDynamicDaoImpl.java:158)
 [dal.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.HostNetworkTopologyPersisterImpl.persistTopology(HostNetworkTopologyPersisterImpl.java:290)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.HostNetworkTopologyPersisterImpl.lambda$persistAndEnforceNetworkCompliance$0(HostNetworkTopologyPersisterImpl.java:102)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInRequired(TransactionSupport.java:139)
 [utils.jar:]
        at 
org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInScope(TransactionSupport.java:105)
 [utils.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.HostNetworkTopologyPersisterImpl.persistAndEnforceNetworkCompliance(HostNetworkTopologyPersisterImpl.java:98)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataVDSCommand.persistCollectedData(CollectVdsNetworkDataVDSCommand.java:35)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataAfterInstallationVDSCommand.persistCollectedData(CollectVdsNetworkDataAfterInstallationVDSCommand.java:22)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataVDSCommand.lambda$executeVdsBrokerCommand$0(CollectVdsNetworkDataVDSCommand.java:26)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.utils.transaction.TransactionSupport.executeInNewTransaction(TransactionSupport.java:202)
 [utils.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.CollectVdsNetworkDataVDSCommand.executeVdsBrokerCommand(CollectVdsNetworkDataVDSCommand.java:25)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.VdsBrokerCommand.executeVdsCommandWithNetworkEvent(VdsBrokerCommand.java:123)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.VdsBrokerCommand.executeVDSCommand(VdsBrokerCommand.java:111)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.VDSCommandBase.executeCommand(VDSCommandBase.java:65)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.dal.VdcCommandBase.execute(VdcCommandBase.java:31) 
[dal.jar:]
        at 
org.ovirt.engine.core.vdsbroker.vdsbroker.DefaultVdsCommandExecutor.execute(DefaultVdsCommandExecutor.java:14)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.ResourceManager.runVdsCommand(ResourceManager.java:398)
 [vdsbroker.jar:]
        at 
org.ovirt.engine.core.vdsbroker.ResourceManager$Proxy$_$$_WeldSubclass.runVdsCommand$$super(Unknown
 Source) [vdsbroker.jar:]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
[rt.jar:1.8.0_212]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [rt.jar:1.8.0_212]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_212]
        at 
org.jboss.weld.interceptor.proxy.TerminalAroundInvokeInvocationContext.proceedInternal(TerminalAroundInvokeInvocationContext.java:51)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.interceptor.proxy.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:78)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.ovirt.engine.core.common.di.interceptor.LoggingInterceptor.apply(LoggingInterceptor.java:12)
 [common.jar:]
        at sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source) 
[:1.8.0_212]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 [rt.jar:1.8.0_212]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_212]
        at 
org.jboss.weld.interceptor.reader.SimpleInterceptorInvocation$SimpleMethodInvocation.invoke(SimpleInterceptorInvocation.java:73)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeAroundInvoke(InterceptorMethodHandler.java:84)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeInterception(InterceptorMethodHandler.java:72)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.invoke(InterceptorMethodHandler.java:56)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:79)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:68)
 [weld-core-impl-3.0.5.Final.jar:3.0.5.Final]
        at 
org.ovirt.engine.core.vdsbroker.ResourceManager$Proxy$_$$_WeldSubclass.runVdsCommand(Unknown
 Source) [vdsbroker.jar:]
        ... 92 more
Caused by: org.postgresql.util.PSQLException: ERROR: duplicate key value 
violates unique constraint "name_server_pkey"
  Detail: Key (dns_resolver_configuration_id, 
address)=(5e4bbac0-a0b4-458f-bb9e-f959efaf810f, 10.0.8.1) already exists.
  Where: SQL statement "INSERT INTO
    name_server(
      address,
      position,
      dns_resolver_configuration_id)
    VALUES (
      v_address,
      v_position,
      v_dns_resolver_configuration_id)"
PL/pgSQL function insertnameserver(uuid,character varying,smallint) line 3 at 
SQL statement
        at 
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2433)
        at 
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2178)
        at 
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:306)
        at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:441)
        at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:365)
        at 
org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:155)
        at 
org.postgresql.jdbc.PgCallableStatement.executeWithFlags(PgCallableStatement.java:78)
        at 
org.postgresql.jdbc.PgPreparedStatement.execute(PgPreparedStatement.java:144)
        at 
org.jboss.jca.adapters.jdbc.CachedPreparedStatement.execute(CachedPreparedStatement.java:303)
        at 
org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.execute(WrappedPreparedStatement.java:442)
        at 
org.springframework.jdbc.core.JdbcTemplate.lambda$call$4(JdbcTemplate.java:1105)
 [spring-jdbc.jar:5.0.4.RELEASE]
        at 
org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:1050) 
[spring-jdbc.jar:5.0.4.RELEASE]
        ... 137 more

2019-06-16 23:16:47,896+01 ERROR 
[org.ovirt.engine.core.bll.hostdeploy.InstallVdsInternalCommand] 
(EE-ManagedThreadFactory-engine-Thread-1) [dd6ed2d] Host installation failed 
for host '5e4bbac0-a0b4-458f-bb9e-f959efaf810f', 'host': Failed to configure 
management network on the host


Seems to be failing when attempting to add the DNS server address. How do I fix 
this?
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