LFS258 - New course version now live! (updated labs)

fcioanca

Hi,

We have updated the labs LFS258 this afternoon to work with Kubernetes v1.9.1. Please clear your cache to ensure you have access to the latest updates.

Updates to the course content are coming in about 6 weeks.

Regards,

Flavia

The Linux Foundation Training Team

mixpix3ls

Great timing Flavia! I just started this course tonight!

schotlandzegtja

Hey Flavia,

Lab 6.1 asks you to create a ReplicaSet from the text specified in the PDF. Unfortunately when you try to run it you get this error:

➜ kubectl create -f rs.yaml
The ReplicaSet "rs-one" is invalid:
* spec.selector: Required value
* spec.template.metadata.labels: Invalid value: map[string]string{"system":"ReplicaOne"}: `selector` does not match template `labels`

It would appear that you can no longer reply on an implicit selector, so you must specify it explicitly. It would be great if you could update the course material to reflect this for anyone running 1.9.2. Here is a patch of the broken manifest as in the lab, and the one I corrected. 

--- rs.yaml	2018-01-29 18:39:32.000000000 +0100
+++ rs_2.yaml	2018-01-29 18:45:21.000000000 +0100
@@ -4,9 +4,6 @@
   name: rs-one
 spec:
   replicas: 2
-  selector:
-    matchLabels:
-      system: ReplicaOne
   template:
     metadata:
       labels:

Thanks!

Ross

schotlandzegtja

Hi serewicz,

I haven't tried it but it's part of the 1.8 to 1.9 changes, so it will affect 1.9.1 too I am sure (see "Default selectors are deprecated" https://kubernetes.io/docs/reference/workloads-18-19/).



Further, please see Lab 6.3. At step 1, the learner expects the DaemonSet to be using an 'OnDelete' updateStrategy, but as per the 1.8 to 1.9 changes, the updateStrategy value for all kinds defaults to RollingUpdate, thereby ruining the rest of the lab (see https://kubernetes.io/docs/reference/workloads-18-19/ "Default rolling updates").

Has anyone reviewed the course material since the exam was upgraded?

Thanks,

Ross