mirror of https://github.com/kubernetes/kops.git
128 lines
4.9 KiB
Markdown
128 lines
4.9 KiB
Markdown
# Upgrading kubernetes
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Upgrading kubernetes is very easy with kOps, as long as you are using a compatible version of kOps.
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The kOps `1.18.x` series (for example) supports the kubernetes 1.16, 1.17 and 1.18 series,
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as per the kubernetes deprecation policy. Older versions of kubernetes will likely still work, but these
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are on a best-effort basis and will have little if any testing. kOps `1.18` will not support the kubernetes
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`1.19` series, and for full support of kubernetes `1.19` it is best to wait for the kOps `1.19` series release.
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We aim to release the next major version of kOps within a few weeks of the equivalent major release of kubernetes,
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so kOps `1.19.0` will be released within a few weeks of kubernetes `1.19.0`. We try to ensure that a 1.19 pre-release
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(alpha or beta) is available at the kubernetes release, for early adopters.
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Upgrading kubernetes is similar to changing the image on an InstanceGroup, except that the kubernetes version is
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controlled at the cluster level. So instead of `kops edit ig <name>`, we `kops edit cluster`, and change the
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`kubernetesVersion` field. `kops edit cluster` will open your editor with the cluster, similar to:
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```yaml
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# Please edit the object below. Lines beginning with a '#' will be ignored,
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# and an empty file will abort the edit. If an error occurs while saving this file will be
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# reopened with the relevant failures.
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#
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apiVersion: kops.k8s.io/v1alpha2
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kind: Cluster
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metadata:
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name: simple.k8s.local
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spec:
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api:
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loadBalancer:
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type: Public
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authorization:
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alwaysAllow: {}
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channel: stable
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cloudProvider: gce
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configBase: gs://kubernetes-clusters/simple.k8s.local
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etcdClusters:
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- etcdMembers:
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- instanceGroup: master-us-central1-a
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name: a
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name: main
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- etcdMembers:
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- instanceGroup: master-us-central1-a
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name: a
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name: events
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iam:
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legacy: false
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kubernetesApiAccess:
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- 0.0.0.0/0
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kubernetesVersion: 1.17.2
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masterInternalName: api.internal.simple.k8s.local
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masterPublicName: api.simple.k8s.local
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networking:
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kubenet: {}
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nonMasqueradeCIDR: 100.64.0.0/10
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project: gce-project
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sshAccess:
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- 0.0.0.0/0
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subnets:
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- name: us-central1
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region: us-central1
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type: Public
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topology:
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dns:
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type: Public
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masters: public
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nodes: public
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```
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Edit `kubernetesVersion`, changing it to `1.17.7` for example.
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Apply the changes to the cloud infrastructure using `kops update cluster` and `kops update cluster --yes`:
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```
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Will create resources:
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InstanceTemplate/master-us-central1-a-simple-k8s-local
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Network name:default id:default
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Tags [simple-k8s-local-k8s-io-role-master]
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Preemptible false
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BootDiskImage cos-cloud/cos-stable-57-9202-64-0
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BootDiskSizeGB 64
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BootDiskType pd-standard
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CanIPForward true
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Scopes [compute-rw, monitoring, logging-write, storage-ro, https://www.googleapis.com/auth/ndev.clouddns.readwrite]
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Metadata {cluster-name: <resource>, startup-script: <resource>}
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MachineType n1-standard-1
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InstanceTemplate/nodes-simple-k8s-local
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Network name:default id:default
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Tags [simple-k8s-local-k8s-io-role-node]
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Preemptible false
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BootDiskImage debian-cloud/debian-9-stretch-v20170918
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BootDiskSizeGB 128
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BootDiskType pd-standard
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CanIPForward true
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Scopes [compute-rw, monitoring, logging-write, storage-ro]
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Metadata {startup-script: <resource>, cluster-name: <resource>}
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MachineType n1-standard-2
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Will modify resources:
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InstanceGroupManager/us-central1-a-master-us-central1-a-simple-k8s-local
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InstanceTemplate id:master-us-central1-a-simple-k8s-local-1507089163 -> name:master-us-central1-a-simple-k8s-local
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InstanceGroupManager/us-central1-a-nodes-simple-k8s-local
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InstanceTemplate id:nodes-simple-k8s-local-1507089694 -> name:nodes-simple-k8s-local
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```
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`kops rolling-update cluster` will show that all nodes need to be restarted.
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```
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NAME STATUS NEEDUPDATE READY MIN MAX NODES
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master-us-central1-a NeedsUpdate 1 0 1 1 1
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nodes NeedsUpdate 3 0 3 3 3
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```
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Restart the instances with `kops rolling-update cluster --yes`.
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```
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> kubectl get nodes -owide
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NAME STATUS AGE VERSION EXTERNAL-IP OS-IMAGE KERNEL-VERSION
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master-us-central1-a-8fcc Ready 26m v1.17.7 35.194.56.129 Container-Optimized OS from Google 4.4.35+
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nodes-9cml Ready 16m v1.17.7 35.193.12.73 Ubuntu 16.04.3 LTS 4.10.0-35-generic
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nodes-km98 Ready 10m v1.17.7 35.194.25.144 Ubuntu 16.04.3 LTS 4.10.0-35-generic
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nodes-wbb2 Ready 2m v1.17.7 35.188.177.16 Ubuntu 16.04.3 LTS 4.10.0-35-generic
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```
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<!-- TODO: Do we drain, validate and then restart -->
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<!-- TODO: Fix timings in rolling update -->
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