Kubernetes 101 : Disruptive and non-disruptive updates of a deployment
Below, we have a Yaml configuration file for a deployment with two "nginx" replicas:
The "deployment-1.yaml" file:
The non-disruptive way of updating a deployment:
The below command opens the Yaml file "deployment-1.yaml" in the Vi editor:
After updating the Yaml file "deployment-1" in Vi, we save it and we apply the changes using the below command:
Remark:
Vi is the default editor. It could be changed using the environment variable "KUBE_EDITOR".
The "Vi" editor basic commands:
Below are some useful "Vi" editor commands:
- :wq + <Return> : quits Vi after saving the file
- :q + <Return> : exits Vi
- :q! + <Return> : quits Vi without saving
- i : inserts text before the cursor until we hit <Esc>
- a : adds text after the cursor until we hit <Esc>
- j : moves cursor down one line
- k : moves cursor up one line
- h : moves cursor to the left one character
- l : moves cursor to the right one character
Disruptive updates "deployment":
To force the update of our deployment that for some reason couldn't be done non-disruptively, we use the below command to delete and re-create our resource.
After modifying our Yaml file, we can "force" the update using the below command:
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