Hi All, I am using below yaml file but maxUnavailable and maxSurge parameters don’t work. They remain at %25. Any idea?
- image: nginx
Kindly check the example below for more explanation:
In Kubernetes there are different strategies for deployment such as Recreate and RollingUpdate which mentioned at the beginning of the <https://www.udemy.com/course/learn-kubernetes/learn/lecture/9723240|lecture 34https://www.udemy.com/course/learn-kubernetes/learn/lecture/9723240> .
If you don’t assign the strategy it will be by default the RollingUpdate and you can see the default properties of it by excuting the following command:
kubectl edit deployment/mywebapp-deployment
and this is a snippet from the output :
- RollingUpdate strategy deployment ensures that only a certain number of Pods are down while they are being updated. By default, it ensures that at least 75% of the desired number of Pods are up (25% max unavailable).
- The deployment also ensures that only a certain number of Pods are created above the desired number of Pods. By default, it ensures that at most 125% of the desired number of Pods are up (25% max surge).
so in our example, It makes sure that at least 5 Pods are available and that at max 8 Pods in total are available.
As a result of that: during the update process, it terminated one pod as 25% max unavailable equals 1 and create only three pods then stuck as it reached 125% of the desired number of pods which equals 8 and can’t create more pods.
Reference : https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
hi @Mohamed Ayman, problem is that I added values in the YAML file. there is no error when executing it. But values were not configured as they are in YAML file.