How to troubleshoot connectivity issues with CD in Kubernetes


Your CloudBees CD instance has a connectivity issue to some external service (for example, a database), and you would like to troubleshoot if it’s a networking issue or not.



Since the containers do not run as root, you can’t use apt-get to install diagnostic utilities into the Kubernetes pods (such as telnet), so one solution is to manually copy the required binaries into the pod.

We can use another machine with kubectl access to download the appropriate binary (URL below is one example), and then kubectl cp it into the pod, by running:

ar -x telnet_0.17-41.2build1_amd64.deb 
tar -xvf ./data.tar.xz
kubectl cp ./usr/bin/telnet.netkit rkivisto-cd/flow-server-58564585d4-5plpq:/tmp/telnet

In the above, rkivisto-cd is the namespace, and flow-server-58564585d4-5plpq is the pod name, which will be different in your deployment.

Next, we can test if there is network connectivity from the pod to the target server (in this case, a database in Azure), by running:

$ kubectl exec -it pod/flow-server-58564585d4-5plpq -n rkivisto-cd -- /tmp/telnet 1443
Connected to
Escape character is '^]'.

The above output is expected if there is network connectivity on port 1443.

Tested product/plugin versions

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