Thursday, May 9, 2019
watching O'Reilly Software Architecture Conference New York 2019, keynotes are already pretty good (links are from subscribed service):
- Roaming free: The power of reading beyond your field - Glenn Vanderburg
- Design after Agile: How to succeed by trying less - Stuart Halloway
- Design and architecture: Special Dumpster Fire Unit - Matt Stine
- From the Trenches: An interview with Mark Richards - Mark Richards (Independent), Neal Ford (ThoughtWorks)
about Glenn Vanderburg's talk, he wrote a blog post with all books he mentioned in the talk: Reading Broadly: A List of Good Books
very good fireside chat: VCF East 2019 – Brian Kernighan interviews Ken Thompson
some pretty good videos from RedisConf 2019:
- Scaling Redis To 1M Ops/Sec - Jane Paek
- Using Redis Streams to Build Event Driven Microservices and User Interface In Clojure (Script) - Bobby Calderwood
Jane Paek's talk is great, learned many things from it.
one is using range partitioning to scale pub/sub, very good idea.
joined an online training from OReilly: Building and Managing Kubernetes Applications, by Sébastien Goasguen
some notes:
quickly generate yaml manifest
$ kubectl run app --image=nginx --restart=Never -o yaml --dry-run
--restart=Never
makes it a Pod
kind, --dry-run
skips creating the actual pod to run
rollback
$ kubectl rollout history deployment app
$ kubectl rollout undo deployment app --to-revision 1
quick start a wordpress
$ kubectl run mysql --image=mysql:5.5 --env MYSQL_ROOT_PASSWORD=root
$ kubectl expose deployment mysql --port 3306
$ kubectl run wordpress --image=wordpress --env WORDPRESS_DB_HOST=mysql --env WORDPRESS_DB_PASSWORD=root
$ kubectl expose deployment wordpress --port 80 --type NodePort
Friday, May 10, 2019
continue with the online training:
relax isolation
spec:
ShareProcessNamespace: true
it relaxes isolation between containers in the pod
when you ps
in one of the containers, you'll see /pause
as pid 1
helm
download client from helm repo
$ kubectl -n kube-system create serviceaccount tiller
$ kubectl create clusterrolebinding tiller --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
$ helm init --service-account tiller
$ helm search minio
$ helm install stable/minio
$ helm ls
$ helm delete <chart name>
can also just download the chart tar ball:
$ helm fetch stable/minio
kustomize
Kustomize - Kubernetes native configuration management
pod.yaml
:
apiVersion: v1
kind: Pod
metadata:
name: kusto
spec:
containers:
- name: test
image: nginx
kustomization.yaml
:
commonLabels:
oreilly: foo
imageTags:
- name: nginx
newTag: v1
resources:
- pod.yaml
since kubectl v1.14
, instead of running kustomize build .
, now you can run with kubectl kustomize .
also a -k
flag to directly apply the manifest
Custom Resource Definitions (CRD)
Extend the Kubernetes API with CustomResourceDefinitions - Kubernetes
stream.yaml
:
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
name: streams.netflix.com
spec:
group: netflix.com
version: v1alpha1
scope: Namespaced
names:
plural: streams
singular: stream
kind: Stream
shortNames:
‐ stm
$ kubectl create -f stream.yaml
$ kubectl get streams
$ kubectl get stm
$ kubectl get stream
st.yaml
:
apiVersion: apiextensions.k8s.io/v1beta1
kind: Stream
metadata:
name: designatedsurvivor
spec:
type: kiefer
then
$ kubectl create -f st.yaml
$ kubectl get stm
define CRDs, and write controllers or operators to extend your k8s
tools to help with writing controlers/operators:
- operator-framework/operator-sdk: SDK for building Kubernetes applications. Provides high level APIs, useful abstractions, and project scaffolding.
- kubernetes-sigs/kubebuilder: Kubebuilder - SDK for building Kubernetes APIs using CRDs
Thursday, May 16, 2019
notes from Introduction to Knative online training:
download triggermesh/tm and login to triggermesh (free, just use github/google account to login)
Install Knative on a Kubernetes cluster
after installed knative, check what's added to the system:
$ kubectl get crd | grep knative
$ kubectl get ns | grep knative
$ kubectl get builds --all-namespaces
Knative Serving
$ kubectl get pods -n knative-serving
Knative Build
knative build is being deprecated in favor of tekton (original knative pipeline)
Knative Eventing
- channel
- subscription
- broker
- trigger
$ kubectl get pods -n knative-eventing
a simple event source:
apiVersion: sources.eventing.knative.dev/v1alpha1
kind: CronJobSource
metadata:
name: test‐cronjob‐source
spec:
schedule: "*/2 * * * *"
data: '{"message": "Hello world!"}'
sink:
apiVersion: serving.knative.dev/v1alpha1
kind: Service
name: event‐display
ksources for more info
Thursday, May 23, 2019
from My new favorite tool for looking at TLS things is certigo, learned about certigo, good tool
Kubernetes Serverless with Knative
knative has 3 primary components:
- Build
- Serving
- Eventing
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