Team, It was an kubernetes DNS resolution issue. With the help of following link - https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/ created (*dnsutils.yaml*) pod and found that my K8s cluster pods was returning following error "*connection timed out; no servers could be reached"* for below command.
kubectl exec -i -t dnsutils -- nslookup kubernetes.default So i have uninstalled and re-installed *Kubernetes version - v1.19.0*. Now everything working fine. Thanks.!!! On Friday, August 28, 2020 at 10:16:45 AM UTC+5:30, Mk wrote: > > Dear Team, > > I have *Jenkins Master* &* K8s-Master* running on same server(*CentOS-8*), > Configured Jenkins *Kubernetes Plugin version - 1.26.4* But while running > pipeline job i always getting an error, Below is K8s cluster jenkins agent > pod log. > > [root@K8s-Master /]# kubectl logs -f pipeline-test-33-sj6tl-r0clh-g559d -c > jnlp > > Aug 08, 2020 8:37:21 AM hudson.remoting.jnlp.Main createEngine > INFO: Setting up agent: pipeline-test-33-sj6tl-r0clh-g559d > Aug 08, 2020 8:37:21 AM hudson.remoting.jnlp.Main$CuiListener <init> > INFO: Jenkins agent is running in headless mode. > Aug 08, 2020 8:37:21 AM hudson.remoting.Engine startEngine > INFO: Using Remoting version: 4.3 > Aug 08, 2020 8:37:21 AM org.jenkinsci.remoting.engine.WorkDirManager > initializeWorkDir > INFO: Using /home/jenkins/agent/remoting as a remoting work directory > Aug 08, 2020 8:37:21 AM org.jenkinsci.remoting.engine.WorkDirManager > setupLogging > INFO: Both error and output logs will be printed to > /home/jenkins/agent/remoting > Aug 08, 2020 8:37:21 AM hudson.remoting.jnlp.Main$CuiListener status > INFO: Locating server among [http://jenkins-serverjenkins/] > Aug 08, 2020 8:37:41 AM hudson.remoting.jnlp.Main$CuiListener error > > SEVERE: Failed to connect to > http://jenkins-server/jenkins/tcpSlaveAgentListener/: jenkins-server > java.io.IOException: Failed to connect to > http://jenkins-serverjenkins/tcpSlaveAgentListener/: jenkins-server > at > org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver.resolve(JnlpAgentEndpointResolver.java:217) > at hudson.remoting.Engine.innerRun(Engine.java:693) > at hudson.remoting.Engine.run(Engine.java:518) > Caused by: java.net.UnknownHostException: jenkins-server > 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:1226) > 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.resolve(JnlpAgentEndpointResolver.java:214) > > > ... 2 more > > > Below settings configuration already enabled glocal security section. > > Manage Jenkins --> Configure Global Security --> Agents Random [Enabled] > > > > [image: 1.png] > > > > > I am successfully able to communicate from my Jenkins to the K8s master > cluster(Verified in Jenkins Cloud section). > > Even in K8s master server all the namespace pods are running. *Flannel > CNI installed*, Not sure what is causing problem with agent provisioning > through Jenkins. > > Would appreciate any suggestions. > -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/b0e419c3-c06a-4052-b5cd-64609b038d55o%40googlegroups.com.
