Setting up Highly Available Kubernetes Cluster. Here it describes how to run a cluster in multiple zones on AWS Platform. Kubernetes 1.2 adds support for running a single cluster in multiple failure zones, AWS calls them “availability zones”, Multizone support is deliberately limited: one or more Kubernetes cluster will run in multiple zones
Here it describes how to run a cluster in multiple zones on AWS Platform
Kubernetes 1.2 adds support for running a single cluster in multiple failure zones, AWS calls them “availability zones”, Multizone support is deliberately limited: one or more Kubernetes cluster will run in multiple zones
When the nodes area unit started, the kubelet itself adds labels to them with zone data.
Kubernetes can mechanically unfold the pods during a replication controller or service across nodes during a single-zone cluster (to cut back the impact of failures.)
With multiple-zone clusters, this spreading behavior is extended across zones (to cut back the impact of zone failures.) (This is achieved via SelectorSpreadPriority).
When persistent volumes are created, the PersistentVolumeLabel admission controller mechanically adds zone labels to them.
The scheduler (via the VolumeZonePredicate predicate) can then make sure that pods that claim a given volume are placed into the identical zone as that volume, as volumes cannot
The following limitations are self-addressed with topology-aware volume binding.
We’re currently attending to rehearse fitting and employing a multi-zone cluster on each GCE & AWS. To do so, you remark a full cluster (specifying MULTIZONE=true), so you add nodes in extra zones by running Kube-up once more (specifying KUBE_USE_EXISTING_MASTER=true).
Create the cluster as traditional, however, pass MULTIZONE to inform the cluster to manage multiple zones making nodes in us-central1-a.
curl -sS https://get.k8s.io | MULTIZONE=true KUBERNETES_PROVIDER=aws KUBE_AWS_ZONE=us-west-2a NUM_NODES=3 bash
AWS: This step brings up a cluster as traditional, still running during a single zone (but MULTIZONE=true has enabled multi-zone capabilities).
View the nodes you’ll be able to see that they’re labeled with zone info. They are bushed us-central1-a (GCE) or us-west-2a (AWS) thus far. The labels are
failure-domain.beta.kubernetes.io/region for the region, and
failure-domain.beta.kubernetes.io/zone for the zone:
kubectl get nodes --show-labels
The output is similar to this:
NAME STATUS ROLES AGE VERSION LABELS kubernetes-master Ready,SchedulingDisabled <none> 5m v1.13.0 beta.kubernetes.io/instance-type=n1-standard-1,failure-domain.beta.kubernetes.io/region=us-central1,failure-domain.beta.kubernetes.io/zone=us-central1-a,kubernetes.io/hostname=kubernetes-master kubernetes-minion-87yt Ready <none> 5m v1.13.0 beta.kubernetes.io/instance-type=n1-standard-2,failure-domain.beta.kubernetes.io/region=us-central1,failure-domain.beta.kubernetes.io/zone=us-central1-a,kubernetes.io/hostname=kubernetes-minion-87yt kubernetes-minion-89hf Ready <none> 5m v1.13.0 beta.kubernetes.io/instance-type=n1-standard-2,failure-domain.beta.kubernetes.io/region=us-central1,failure-domain.beta.kubernetes.io/zone=us-central1-a,kubernetes.io/hostname=kubernetes-minion-89hf kubernetes-minion-n45g Ready <none> 5m v1.13.0 beta.kubernetes.io/instance-type=n1-standard-2,failure-domain.beta.kubernetes.io/region=us-central1,failure-domain.beta.kubernetes.io/zone=us-central1-a,kubernetes.io/hostname=kubernetes-minion-n45g
Our original Kubernetes tool list was so popular that we've curated another great list of tools to help you improve your functionality with the platform.
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