SCDF server failing to start with the k8s version 1.20 - spring-cloud-dataflow

Question

We recently upgraded to k8s version 1.20.9 and not sure if that is the root cause but SCDF server pod fails to come up with the error below.
I usually deploy scdf server using kubectl based deployment.
Anyone has any idea ? Attached error below.
2022-01-05 05:08:56.207 INFO 1 --- [ main]
o.a.coyote.http11.Http11NioProtocol : Starting ProtocolHandler
["http-nio-80"] 2022-01-05 05:08:56.300 WARN 1 --- [ main]
ConfigServletWebServerApplicationContext : Exception encountered
during context initialization - cancelling refresh attempt:
org.springframework.context.ApplicationContextException: Failed to
start bean 'webServerStartStop'; nested exception is
org.springframework.boot.web.server.WebServerException: Unable to
start embedded Tomcat server 2022-01-05 05:08:56.798 INFO 1 --- [
main] j.LocalContainerEntityManagerFactoryBean : Closing JPA
EntityManagerFactory for persistence unit 'default' 2022-01-05
05:08:56.893 INFO 1 --- [ main]
com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown
initiated... 2022-01-05 05:08:57.194 INFO 1 --- [ main]
com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown
completed. 2022-01-05 05:08:57.197 INFO 1 --- [ main]
o.a.coyote.http11.Http11NioProtocol : Pausing ProtocolHandler
["http-nio-80"] 2022-01-05 05:08:57.197 INFO 1 --- [ main]
o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-01-05 05:08:57.292 INFO 1 --- [ main]
o.a.coyote.http11.Http11NioProtocol : Stopping ProtocolHandler
["http-nio-80"] 2022-01-05 05:08:57.293 INFO 1 --- [ main]
o.a.coyote.http11.Http11NioProtocol : Destroying ProtocolHandler
["http-nio-80"] 2022-01-05 05:08:57.793 ERROR 1 --- [ main]
o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Failed to
start bean 'webServerStartStop'; nested exception is
org.springframework.boot.web.server.WebServerException: Unable to
start embedded Tomcat server Caused by:
org.springframework.boot.web.server.WebServerException: Unable to
start embedded Tomcat server Caused by:
java.lang.IllegalArgumentException:
standardService.connector.startFailed Caused by:
org.apache.catalina.LifecycleException: Protocol handler start failed
Caused by: java.net.SocketException: Permission denied

Answer 1

What stands out in the trace is SocketException: permission denied It is likely due to some security configuration change in the upgrade affecting the TCP layer. I would start with your security configuration. Keep us posted.