The document discusses container and Kubernetes technologies. It provides an example Kubernetes deployment file and covers topics like containerization with Docker, Kubernetes distributions, designing applications for robustness, running applications in containers, debugging containerized applications, and common errors. The document concludes with an invitation to visit VSHN.ch for coffee.

1. My broken container is
gone - where is my
container ?

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Agenda

3. → → →
About Aarno & VSHN.ch

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Container technology: Docker

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Container orchestration: Kubernetes

6. Kubernetes
Example
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: hello-deploy
spec:
replicas: 2
template:
metadata:
labels:
app: hello
spec:
containers:
- name: hello
image: arska/flask-helloworld:1
ports:
- containerPort: 8080
env:
- name: MESSAGE
value: "This is my config value"

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Kubernetes Distributions

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Cloud native IT governance

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Design your application for robustness

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Running an application in a container

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Local build/start debugging

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If your application doesn’t start

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If your application starts but behaves strangely

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bad data on persistent volume

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Have you tried turning it off and on again?

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Errors during build on the platform

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Errors during deployment

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Volume mount fails

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errors due to running as root in container
$ oc new-app thesteve0/centoshttpd
...
* WARNING: Image "thesteve0/centoshttpd" runs as the 'root' user which may not be permitted by your cluster
administrator
...
$ oc get pods
NAME READY STATUS RESTARTS AGE
centoshttpd-1-46gt6 0/1 CrashLoopBackOff 4 2m
$ oc logs dc/centoshttpd
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.1.10.84. Set the
'ServerName' directive globally to suppress this message
(13)Permission denied: AH00058: Error retrieving pid file /run/httpd/httpd.pid
AH00059: Remove it before continuing if it is corrupted.

20. Come visit us for a coffee!
https://vshn.ch/kontakt/