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Managed Kubernetes objects (services, deployments, pods...)
2022-02-24

We list here the Kubernetes objects you can find running in an OVHcloud Managed Kubernetes.

These objects are created either at the cluster or at the node creation, and they allow the cluster operation and management.

Warning

Please refrain from deleting or otherwise altering them!

Namespaces

There are several existing namespaces running in your cluster:

  • default: namespace by default
  • kube-node-lease: for heartbeat Node's lease object
  • kube-public: reserved mainly for cluster usage & in case of specific resources which should be publicly available
  • kube-system: for objects created by Kubernetes

The following listed resources are running in theses namespaces.

Services

There are several management services running in your cluster:

  • kubernetes
  • kube-dns
  • metrics-server
  • wormhole

In my example cluster, I get:

$ kubectl get services --all-namespaces
NAMESPACE     NAME                        TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)                  AGE
default       kubernetes                  ClusterIP      10.3.0.1       <none>           443/TCP                  14d
kube-system   kube-dns                    ClusterIP      10.3.0.10      <none>           53/UDP,53/TCP,9153/TCP   14d
kube-system   metrics-server              ClusterIP      10.3.224.150   <none>           443/TCP                  14d
kube-system   wormhole                    ClusterIP      10.3.0.2       <none>           443/TCP                  14d

Deployments

To implement these services, you will find several deployment objects:

  • coredns
  • kube-dns-autoscaler
  • metrics-server

In my example cluster, I get:

$ kubectl get deployments --all-namespaces
NAMESPACE     NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
kube-system   coredns                     2/2     2            2           14d
kube-system   kube-dns-autoscaler         1/1     1            1           14d
kube-system   metrics-server              1/1     1            1           14d

Daemon sets

There are also several daemonsets to define the pods that will be deployed in every node:

  • canal
  • kube-proxy
  • wormhole

In my example cluster, with 5 nodes, I get:

$ kubectl get daemonsets --all-namespaces
NAMESPACE     NAME         DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
kube-system   canal        3         3         3       3            3           beta.kubernetes.io/os=linux   14d
kube-system   kube-proxy   3         3         3       3            3           <none>                        14d
kube-system   wormhole     3         3         3       3            3           <none>                        14d

Replica sets

There are also several replicasets to define the pods that will run on several instances:

  • coredns-*
  • kube-dns-autoscaler-*
  • metrics-server-*

In my example cluster, I get:

$ kubectl get replicaset --all-namespaces
NAMESPACE     NAME                                   DESIRED   CURRENT   READY   AGE
kube-system   coredns-77b9fbd56                      2         2         2       14d
kube-system   kube-dns-autoscaler-ddf4c7d5b          1         1         1       14d
kube-system   metrics-server-66bb5cd998              1         1         1       14d

Pods

You will find one instance of the following pods running in every node of your cluster:

  • canal
  • kube-proxy
  • wormhole

You will also find one global instance of:

  • kube-dns-autoscaler
  • metrics-server

And several instances of:

  • coredns

In my example cluster, with 3 nodes, I get:

$ kubectl get pods --all-namespaces
NAMESPACE     NAME                                         READY   STATUS    RESTARTS      AGE
kube-system   canal-lcmmw                                  2/2     Running   2 (14d ago)   14d
kube-system   canal-ljcfj                                  2/2     Running   2 (14d ago)   14d
kube-system   canal-x56p5                                  2/2     Running   1 (14d ago)   14d
kube-system   coredns-77b9fbd56-4s8mb                      1/1     Running   0             14d
kube-system   coredns-77b9fbd56-fslpn                      1/1     Running   0             14d
kube-system   kube-dns-autoscaler-ddf4c7d5b-chzvs          1/1     Running   0             14d
kube-system   kube-proxy-5qs2t                             1/1     Running   0             14d
kube-system   kube-proxy-qb8h9                             1/1     Running   0             14d
kube-system   kube-proxy-xws7j                             1/1     Running   0             14d
kube-system   metrics-server-66bb5cd998-rs46p              1/1     Running   0             14d
kube-system   wormhole-7cbmc                               1/1     Running   0             14d
kube-system   wormhole-7dt6x                               1/1     Running   0             14d
kube-system   wormhole-vh7pk                               1/1     Running   0             14d

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