hacking metrics into kubeadm

gistfile1.txt

10226  # 1) import components-base into the kubeadm package
10227  # 2) add a few metrics as is done in  vi pkg/kubelet/metrics/metrics.go
10228  # 3) run "make kubeadm"
10229  # 4) run "kubeadm init" on your mac
10230  # 5) like this .//_output/local/go/bin/kubeadm init


diff --git a/cmd/kubeadm/app/kubeadm.go b/cmd/kubeadm/app/kubeadm.go
index 1842cfd8cb4..0ab66a1cadb 100644
--- a/cmd/kubeadm/app/kubeadm.go
+++ b/cmd/kubeadm/app/kubeadm.go
@@ -26,6 +26,24 @@ import (
 
 	cliflag "k8s.io/component-base/cli/flag"
 	"k8s.io/kubernetes/cmd/kubeadm/app/cmd"
+
+        "k8s.io/component-base/metrics"
+//        "k8s.io/component-base/metrics/legacyregistry"
+
+)
+
+
+var (
+        // NodeName is a Gauge that tracks the ode's name. The count is always 1.
+        _ = metrics.NewGaugeVec(
+                &metrics.GaugeOpts{
+                        Subsystem:      "kubeadm",
+                        Name:           "a",
+                        Help:           "The node's name. The count is always 1.",
+                        StabilityLevel: "1",
+                },
+                []string{"a"},
+        )
 )
 
 // Run creates and executes new kubeadm command

Notes to self:

Run on mac:

git clone [email protected]:kubernetes/kubernetes

cd kubernetes

make kubeadm

sudo ./_output/local/go/bin/kubeadm init --v=5 --ignore-preflight-errors=KubeletVersion,SystemVerification

If following the kind setup instructions:

git clone [email protected]:kubernetes/kubernetes $(go env GOPATH)/src/k8s.io/kubernetes

cd $(go env GOPATH)/src/k8s.io/kubernetes

Following these instructions To create a cluster from Kubernetes source:

brew install gnu-tar 

kind build node-image

kind create cluster --image kindest/node:latest

Kind hacking

Run from a version of kubernetes other than master:

cd ~/path/to/kubernetes
git checkout --track remotes/origin/release-1.17

kind build node-image --image=k8s:1.17 
kind -v 10 create cluster --image k8s:1.17

docker inspect kind-control-plane

kind get nodes

Look at what's going on inside the control plane:

docker exec -ti kind-control-plane bash

# the rest of these commands are run from inside the docker container!

journalctl -flu kubelet

more /etc/kubernetes/manifests/etcd.yaml

crictl ps

more /kind/manifests/default-cni.yaml
more /kind/manifests/default-storage.yaml

# don't run these next two unless you know what you're doing!  this will blow away your previous credentials
# kubeadm reset -f
# kubeadm init --config /kind/kubeadm.conf

more /etc/kubernetes/admin.conf

ls /var/log/containers/

Look at what's going on in Docker:

docker ps
docker images