Managed Kubernetes objects (services, deployments, pods...)

Last updated 23 September, 2021.

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.

Please refrain from deleting or otherwise altering them!

Namespaces

There are several existing namespaces running in your cluster:

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

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     $lt;none>        443/TCP         17d
kube-system   kube-dns         ClusterIP   10.3.0.10    $lt;none>        53/UDP,53/TCP   17d
kube-system   metrics-server   ClusterIP   10.3.41.98   $lt;none>        443/TCP         17d
kube-system   wormhole         ClusterIP   10.3.0.2     $lt;none>        443/TCP         17d

Deployments

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

  • kube-dns
  • metrics-server
  • wormhole

In my example cluster, I get:

$ kubectl get deployments --all-namespaces
NAMESPACE     NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
kube-system   kube-dns              2/2     2            2           17d
kube-system   kube-dns-autoscaler   1/1     1            1           17d
kube-system   metrics-server        1/1     1            1           17d

Daemon sets

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

  • canal
  • 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        5         5         5       5            5           beta.kubernetes.io/os=linux   17d
kube-system   kube-proxy   5         5         5       5            5           <none>                        17d
kube-system   wormhole     5         5         5       5            5           <none>                        17d

Replica sets

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

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

In my example cluster, I get:

$ kubectl get replicaset --all-namespaces
NAMESPACE     NAME                             DESIRED   CURRENT   READY   AGE
kube-system   kube-dns-autoscaler-54fc5469d8   1         1         1       17d
kube-system   kube-dns-dfcc979bf               2         2         2       17d
kube-system   metrics-server-9ffb558           1         1         1       17d

Pods

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

  • canal
  • proxy
  • wormhole

You will also find one global instance of:

  • metrics-server
  • kube-dns-autoscaler

And several instances of:

  • kube-dns

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

$ kubectl get pods --all-namespaces
NAMESPACE     NAME                                   READY   STATUS    RESTARTS   AGE
kube-system   canal-25dtz                            2/2     Running   1          17d
kube-system   canal-25vkd                            2/2     Running   0          17d
kube-system   canal-t9v6p                            2/2     Running   0          17d
kube-system   canal-xplff                            2/2     Running   0          17d
kube-system   canal-zs9zn                            2/2     Running   0          17d
kube-system   kube-dns-autoscaler-54fc5469d8-qrs6g   1/1     Running   0          17d
kube-system   kube-dns-dfcc979bf-6jkzt               3/3     Running   0          9d
kube-system   kube-dns-dfcc979bf-xr27d               3/3     Running   0          17d
kube-system   kube-proxy-26hgs                       1/1     Running   0          17d
kube-system   kube-proxy-5xftt                       1/1     Running   0          17d
kube-system   kube-proxy-k2x96                       1/1     Running   0          17d
kube-system   kube-proxy-p8747                       1/1     Running   0          17d
kube-system   kube-proxy-pj4bp                       1/1     Running   0          17d
kube-system   metrics-server-9ffb558-wtcll           1/1     Running   0          17d
kube-system   wormhole-gl64h                         1/1     Running   0          17d
kube-system   wormhole-jd7v5                         1/1     Running   0          17d
kube-system   wormhole-lbxw4                         1/1     Running   0          17d
kube-system   wormhole-zbsmx                         1/1     Running   0          17d
kube-system   wormhole-ztphr                         1/1     Running   0          17d

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