Hi! I have a 7 node HDF cluster installed on local repo (without internet access) Is there any way to "re install" ambari-server after it has been removed by the command: sudo yum erase ambari-server   None of the other files were removed, I just reinstalled ambari-server sudo yum install ambari-server   Is there any way this can be undone / reconfigured / reinstalled? I noticed that the services are still up and running, and only the ambari-server UI is not starting. This is in production and I do not want to lose any data. Kindly help me find a solution for the same!   I used sudo ambari-server setup to configure Java Home and JDBC connection. I even used sudo ambari-server setup-security to enable HTTPS and setup truststore for ambari (like it used to be)   When I run the command sudo ambari-server start it gives following message:   Using python /usr/bin/python Starting ambari-server Ambari Server running with administrator privileges. Organizing resource files at /var/lib/ambari-server/resources... Ambari database consistency check started... Server PID at: /var/run/ambari-server/ambari-server.pid Server out at: /var/log/ambari-server/ambari-server.out Server log at: /var/log/ambari-server/ambari-server.log Waiting for server start..............ERROR: Exiting with exit code -1. REASON: Ambari Server java process has stopped. Please check the logs for more information.   ambari-server.out   OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0 An unexpected error occured during starting Ambari Server. com.google.inject.ProvisionException: Guice provision errors: 1) Error injecting method, java.lang.RuntimeException: Trying to create a ServiceComponent not recognized in stack info, clusterName=cluster_name, serviceName=NIFI, componentName=NIFI_MASTER, stackInfo=HDF-3.1 at org.apache.ambari.server.state.cluster.ClustersImpl.loadClustersAndHosts(ClustersImpl.java:173) at org.apache.ambari.server.state.cluster.ClustersImpl.class(ClustersImpl.java:95) while locating org.apache.ambari.server.state.cluster.ClustersImpl while locating org.apache.ambari.server.state.Clusters for parameter 0 at org.apache.ambari.server.agent.HeartBeatHandler.<init>(HeartBeatHandler.java:115) at org.apache.ambari.server.agent.HeartBeatHandler.class(HeartBeatHandler.java:79) while locating org.apache.ambari.server.agent.HeartBeatHandler 1 error at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at org.apache.ambari.server.controller.AmbariServer.performStaticInjection(AmbariServer.java:903) at org.apache.ambari.server.controller.AmbariServer.run(AmbariServer.java:307) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1072) Caused by: java.lang.RuntimeException: Trying to create a ServiceComponent not recognized in stack info, clusterName=cluster_name , serviceName=NIFI, componentName=NIFI_MASTER, stackInfo=HDF-3.1 at org.apache.ambari.server.state.ServiceComponentImpl.updateComponentInfo(ServiceComponentImpl.java:141) at org.apache.ambari.server.state.ServiceComponentImpl.<init>(ServiceComponentImpl.java:170) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.ProxyFactory$ProxyConstructor.newInstance(ProxyFactory.java:260) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:632) at com.sun.proxy.$Proxy19.createExisting(Unknown Source) at org.apache.ambari.server.state.ServiceImpl.<init>(ServiceImpl.java:162) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.ProxyFactory$ProxyConstructor.newInstance(ProxyFactory.java:260) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:632) at com.sun.proxy.$Proxy15.createExisting(Unknown Source) at org.apache.ambari.server.state.cluster.ClusterImpl.loadServices(ClusterImpl.java:427) at org.apache.ambari.server.state.cluster.ClusterImpl.<init>(ClusterImpl.java:318) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.ProxyFactory$ProxyConstructor.newInstance(ProxyFactory.java:260) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:632) at com.sun.proxy.$Proxy11.create(Unknown Source) at org.apache.ambari.server.state.cluster.ClustersImpl.loadClustersAndHosts(ClustersImpl.java:181) at org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor.invoke(AmbariJpaLocalTxnInterceptor.java:128) at org.apache.ambari.server.state.cluster.ClustersImpl$$FastClassByGuice$$7d58855f.invoke(<generated>) at com.google.inject.internal.cglib.reflect.$FastMethod.invoke(FastMethod.java:53) at com.google.inject.internal.SingleMethodInjector$1.invoke(SingleMethodInjector.java:56) at com.google.inject.internal.SingleMethodInjector.inject(SingleMethodInjector.java:90) at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:110) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:94) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:54) at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38) at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:84) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) ... 4 more Exception in thread "main" org.apache.ambari.server.AmbariException: Error stopping the server at org.apache.ambari.server.controller.AmbariServer.stop(AmbariServer.java:884) at org.apache.ambari.server.controller.AmbariServer.main(AmbariServer.java:1080) ... View more