How to get podCIDR to show up in the node spec?

Hi there,

One of my kubernetes applications (squat/kilo#62) requires the podCIDR field to be added to the node spec. The Pod CIDR allocation is turned on in the controller-manager by default on most kubernetes distributions. This is enabled via --allocate-node-cidrs https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/#options

I was wondering if it was possible to expose that via my Gravity install?

Thanks

Hi Eddie!

We try to keep the github issue tracker focused on actionable features/bugs. I'd recommend using our community forums (https://community.gravitational.com/) or community slack (https://grv8.slack.com) for questions similar to this, and file a issue once it is clear exactly what needs to be done. If you'd like to continue the discussion, try one of those channels.

It looks like the way to turn --allocate-node-cidrs on currently is with the "PLANET_DISABLE_FLANNEL" env variable.

planet/tool/planet/start.go

Lines 830 to 838 in da6d238

    
           config.Env.Upsert("KUBE_ENABLE_IPAM", "false") 
        
           if config.DisableFlannel { 
        
           	// Historically we use etcd for IPAM when running flannel 
        
           	// In this case, we don't want to run the kubernetes IPAM, as the NodeSpec.PodCIDR may not match the flannel IPAM 
        
           	// Other plugins may want the kubernetes IPAM enabled, but unless we pass configuration we won't know. 
        
           	// For now, if flannel is disabled, assume the kubernetes IPAM should be enabled. 
        
           	config.Env.Upsert("KUBE_ENABLE_IPAM", "true") 
        
           	return nil 
        
           }

Interestingly, we declare --allocate-node-cidrs twice:

planet/build.assets/makefiles/master/k8s-master/kube-controller-manager.service

Line 22 in e12a100

--allocate-node-cidrs=${KUBE_ENABLE_IPAM} \

planet/build.assets/makefiles/master/k8s-master/kube-controller-manager.service

Line 17 in e12a100

--allocate-node-cidrs=false \

This definitely seems like a mistake and I'm not sure what the expected behavior is when the flag is declared twice.

	config.Env.Upsert("KUBE_ENABLE_IPAM", "false")
	if config.DisableFlannel {
	// Historically we use etcd for IPAM when running flannel
	// In this case, we don't want to run the kubernetes IPAM, as the NodeSpec.PodCIDR may not match the flannel IPAM
	// Other plugins may want the kubernetes IPAM enabled, but unless we pass configuration we won't know.
	// For now, if flannel is disabled, assume the kubernetes IPAM should be enabled.
	config.Env.Upsert("KUBE_ENABLE_IPAM", "true")
	return nil
	}