62 lines
1.7 KiB
Markdown
62 lines
1.7 KiB
Markdown
Upgrading Kubernetes in Kargo
|
|
=============================
|
|
|
|
#### Description
|
|
|
|
Kargo handles upgrades the same way it handles initial deployment. That is to
|
|
say that each component is laid down in a fixed order. You should be able to
|
|
upgrade from Kargo tag 2.0 up to the current master without difficulty. You can
|
|
also individually control versions of components by explicitly defining their
|
|
versions. Here are all version vars for each component:
|
|
|
|
* docker_version
|
|
* kube_version
|
|
* etcd_version
|
|
* calico_version
|
|
* calico_cni_version
|
|
* weave_version
|
|
* flannel_version
|
|
* kubedns_version
|
|
|
|
#### Unsafe upgrade example
|
|
|
|
If you wanted to upgrade just kube_version from v1.4.3 to v1.4.6, you could
|
|
deploy the following way:
|
|
|
|
```
|
|
ansible-playbook cluster.yml -i inventory/inventory.cfg -e kube_version=v1.4.3
|
|
```
|
|
|
|
And then repeat with v1.4.6 as kube_version:
|
|
|
|
```
|
|
ansible-playbook cluster.yml -i inventory/inventory.cfg -e kube_version=v1.4.6
|
|
```
|
|
|
|
#### Graceful upgrade
|
|
|
|
Kargo also supports cordon, drain and uncordoning of nodes when performing
|
|
a cluster upgrade. There is a separate playbook used for this purpose. It is
|
|
important to note that upgrade-cluster.yml can only be used for upgrading an
|
|
existing cluster. That means there must be at least 1 kube-master already
|
|
deployed.
|
|
|
|
```
|
|
git fetch origin
|
|
git checkout origin/master
|
|
ansible-playbook upgrade-cluster.yml -b -i inventory/inventory.cfg
|
|
```
|
|
|
|
#### Upgrade order
|
|
|
|
As mentioned above, components are upgraded in the order in which they were
|
|
installed in the Ansible playbook. The order of component installation is as
|
|
follows:
|
|
|
|
* Docker
|
|
* etcd
|
|
* kubelet and kube-proxy
|
|
* network_plugin (such as Calico or Weave)
|
|
* kube-apiserver, kube-scheduler, and kube-controller-manager
|
|
* Add-ons (such as KubeDNS)
|