Client Master trying to connect to Kubernetes managed agents

Issue

I am unable to use Kubernetes agents from a traditional Client Master attached to CJOC.

The Client Master logs show something similar to:


2019-06-14 15:15:00.950+0000 [id=59]	INFO	o.c.j.p.k.KubernetesCloud#provision: Template for label my-kubernetes-agent-48223671-ee1c-4b8f-a640-048581019ce1: Kubernetes Pod Template
2019-06-14 15:15:00.951+0000 [id=59]	WARNING	o.c.j.p.k.KubernetesCloud#provision: Failed to connect to Kubernetes at : kubernetes.default.svc
... 

Where my-kubernetes-agent is the agent you are trying to connect to.

The issue is that the Client Master is trying to provision a new Kubernetes agent, using the Cloud configured in CJOC, but, as the Client Master is not actually part of the cluster, it’s unable to connect to Kubernetes namespace (at : kubernetes.default.svc).

The Operations Center and any Managed Masters are created within the Kubernetes namespace, so they are able to connect.

It looks to be mentioned (briefly) in the documentation:

Existing masters that are connected to Operations Center lack key benefits of Managed Masters like high availability and automatic agent management. Whenever possible, administrators should use a Managed Master with CloudBees Core rather than connecting an existing master.

Environment

Resolution

Unfortunately, Client Masters cannot use the Kubernetes automatic agent management system.

You can utilize Kubernetes agents using either a Managed Master or Team Master (they will be running inside of the Kubernetes cluster).

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