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Type: Bug
Resolution: Unresolved
Priority: Minor
Component/s: kubernetes-plugin
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Suppose you have a Jenkins controller using the kubernetes plugin installed in a namespace, and it is actively running some builds. Now you kubectl delete ns xxx. This will pause indefinitely. The controller pod shuts down and is removed, as expected, but the agent pods do not die: they will try every ten seconds to connect back to the controller, which no longer exists.

Nov 10, 2021 2:53:39 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to controller.xxx.svc.cluster.local:50001
Nov 10, 2021 2:53:39 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Trying protocol: JNLP4-connect
Nov 10, 2021 2:53:39 AM org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader run
INFO: Waiting for ProtocolStack to start.
Nov 10, 2021 2:53:39 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Remote identity confirmed: ...
Nov 10, 2021 2:53:40 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connected
Nov 10, 2021 2:57:08 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Terminated
Nov 10, 2021 2:57:18 AM org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver waitForReady
INFO: Failed to connect to the master. Will try again
java.net.UnknownHostException: controller.xxx.svc.cluster.local
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:607)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1223)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:990)
	at org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver.waitForReady(JnlpAgentEndpointResolver.java:407)
	at hudson.remoting.Engine.innerRun(Engine.java:830)
	at hudson.remoting.Engine.run(Engine.java:540)

Nov 10, 2021 2:57:28 AM org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver waitForReady
INFO: Failed to connect to the master. Will try again
java.net.UnknownHostException: controller.xxx.svc.cluster.local
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:607)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
	at sun.net.www.http.HttpClient.New(HttpClient.java:339)
	at sun.net.www.http.HttpClient.New(HttpClient.java:357)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1223)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:990)
	at org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver.waitForReady(JnlpAgentEndpointResolver.java:407)
	at hudson.remoting.Engine.innerRun(Engine.java:830)
	at hudson.remoting.Engine.run(Engine.java:540)

...

Did the agent pod receive SIGTERM but ignore it?

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