Rke: Provide a rke command to display all the supported Kubernetes versions

[soumyalj]

RKE version: : v0.2.0-rc5

Currently there is no easy command to find all the supported Kubernetes versions in RKE.
This would be very useful command for users

[curx]

maybe is this what you looking for?

% rke config --system-images --version - 
WARN[0000] This is not an officially supported version (v0.2.0-rc5) of RKE. Please download the latest official release at https://github.com/rancher/rke/releases/latest 
FATA[0000] k8s version is not supported, supported versions are: [v1.11.5-rancher1-1 v1.11.6-rancher1-1 v1.12.5-rancher1-1 v1.13.1-rancher1-1 v1.12.0-rancher1-1 v1.12.4-rancher1-1 v1.11.1-rancher1-1 v1.11.2-rancher1-2 v1.12.1-rancher1-1 v1.12.3-rancher1-1 v1.11.2-rancher1-1 v1.11.3-rancher1-1] 

[travisghansen]

Would also be nice to show what's the default in the list. Others may want to see versions/defaults of all the images (ie: etcd, cni plugins, etc)

[yjunsun]

Would also be nice to show what's the default in the list. Others may want to see versions/defaults of all the images (ie: etcd, cni plugins, etc)

https://github.com/rancher/types/blob/master/apis/management.cattle.io/v3/k8s_defaults.go

[travisghansen]

I'm aware of that link but when dealing with binary files it's hard to know what was used at the time etc.

[curx]

I know this is only like a workaround, but usable.
for the default kubernetes version of an rke release, get the current system-images tag of the hyperkube image, like

```

rke -v

rke version v0.1.16

rke config --system-images | awk -F':' '/hyperkube/ { print $2 }'

INFO[0000] Generating images list for version [v1.11.6-rancher1-1]:
v1.11.6-rancher1

rke-latest -v

rke version v0.2.0-rc5

rke-latest config --system-images | awk -F':' '/hyperkube/ { print $2 }'

v1.13.1-rancher1

or get the list of the used version of componets like etcd ... without using the awk cmd:

rke config --system-images

INFO[0000] Generating images list for version [v1.11.6-rancher1-1]:
rancher/coreos-etcd:v3.2.18
rancher/rke-tools:v0.1.15
rancher/k8s-dns-kube-dns-amd64:1.14.10
rancher/k8s-dns-dnsmasq-nanny-amd64:1.14.10
rancher/k8s-dns-sidecar-amd64:1.14.10
rancher/cluster-proportional-autoscaler-amd64:1.0.0
rancher/hyperkube:v1.11.6-rancher1
rancher/coreos-flannel:v0.10.0
rancher/coreos-flannel-cni:v0.3.0
rancher/calico-node:v3.1.3
rancher/calico-cni:v3.1.3
rancher/calico-ctl:v2.0.0
weaveworks/weave-kube:2.1.2
weaveworks/weave-npc:2.1.2
rancher/pause-amd64:3.1
rancher/nginx-ingress-controller:0.16.2-rancher1
rancher/nginx-ingress-controller-defaultbackend:1.4
rancher/metrics-server-amd64:v0.2.1
````

[travisghansen]

Yeah, I'm happy enough with the following:

# list default images for all services
rke config --system-images

# list all available kube versions
rke config --system-images --version -

# list default images for all kube versions
rke config --system-images --all

[superseb]

This should be fixed in https://github.com/rancher/rancher/issues/20781 / https://github.com/rancher/rke/pull/1590