README
¶
k8 basic
entire context list
kubectl config get-contexts
set default context and name space
kubectl config use-context docker-desktop
create a namespace and set it as default
kubectl create namespace ksong kubectl config set-context --current --namespace=ksong kubectl config set-context --current --namespace=default
get k8 capacity
kubectl top nodes kubectl describe nodes
entire node list
kubectl get nodes
deploy app
kubectl create deployment kubernetes-bootcamp --image=gcr.io/google-samples/kubernetes-bootcamp:v1 kubectl create deployment cache-client --image=localhost:5001/cache-client
list deployment
kubectl get deployments
check deployment status
kubectl rollout status deployment/kubernetes-bootcamp kubectl rollout status deployments
describe deployment
kubectl describe deployment kubectl describe deployments/kubernetes-bootcamp kubectl describe deployments/fib
remove deployment
kubectl delete deployment kubernetes-bootcamp kubectl delete deployments/fib
list pods
kubectl get pods
read/set name of pod
export POD_NAME="$(kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')";echo Name of the Pod: $POD_NAME
log pod
kubectl logs $POD_NAME
get env of pod
kubectl exec "$POD_NAME" -- env
ssh to pod
kubectl exec -ti $POD_NAME -- bash
run proxy
kubectl proxy
get services
kubectl get services
service details
kubectl describe services/kubernetes-bootcamp kubectl describe services/fib
create a service
kubectl expose deployment/kubernetes-bootcamp --type="NodePort" --port 8080 kubectl expose deployment/fib --type="NodePort" --port 8080
delete a service
kubectl delete service -l app=kubernetes-bootcamp kubectl delete service -l app=peer-aware-groupcache
export port
export NODE_PORT="$(kubectl get services/kubernetes-bootcamp -o go-template='{{(index .spec.ports 0).nodePort}}')" ;echo "NODE_PORT=$NODE_PORT" export NODE_PORT="$(kubectl get services/helm-chart-1704764238-peer-aware-groupcache -o go-template='{{(index .spec.ports 0).nodePort}}')";echo "NODE_PORT=$NODE_PORT"
test service without proxy
curl http://localhost:$NODE_PORT
use a label
kubectl get pods -l app=kubernetes-bootcamp kubectl get services -l app=kubernetes-bootcamp kubectl label pods "$POD_NAME" version=v1 kubectl describe pods "$POD_NAME" kubectl get pods -l version=v1
debug
kubectl describe pods fib-6ff8bffbcc-dcjzg kubectl logs "$POD_NAME" --all-containers kubectl get events kubectl get events --field-selector involvedObject.name=fib-6ff8bffbcc-b9nmz kubectl describe deployment fib
see replica set
kubectl get rs
scale up
kubectl scale deployments/kubernetes-bootcamp --replicas=4 kubectl scale deployments/fib --replicas=1
get pods with more info
kubectl get pods -o wide
upgrade image (rolling update including kill old and start new)
kubectl set image deployments/kubernetes-bootcamp kubernetes-bootcamp=jocatalin/kubernetes-bootcamp:v2 kubectl set image deployments/fib fib=localhost:5001/cache-client:latest
rollout restart deployment
kubectl rollout restart deployment/fib
rollout undo
kubectl rollout undo deployments/kubernetes-bootcamp
create pods using yaml file
kubectl create -f fib.yaml
how to run open local registry
docker run -d -p 5001:5000 --name registry registry:2.7 docker tag cache-client:latest localhost:5001/cache-client
build and redeploy with using registry
docker build --tag localhost:5001/cache-client:v24 . docker push localhost:5001/cache-client:v24 kubectl set image deployments/fib fib=localhost:5001/cache-client:v24
build and redeploy without using registry (fastest)
docker build --tag cache-client:v40 . kubectl set image deployments/fib fib=cache-client:v40
delete/recreate deployment from yaml file to apply latest
kubectl delete -f k8s/example/fib.yaml kubectl create -f k8s/example/fib.yaml
create busybox
kubectl run curl-ksong --image=radial/busyboxplus:curl -i --tty --rm
curl per pods
curl http://localhost:8001/api/v1/namespaces/default/pods/fib-6db7f6c4b8-4ntxk:8080/proxy/
distributed cache
modified version of groupCache
cache data stored by using shard (data will be spread)
git
main: https://github.com/golang/groupcache others: https://github.com/mailgun/groupcache https://github.com/vimeo/galaxycache https://github.com/orijtech/groupcache/tree/instrument-with-opencensus
alternative
https://github.com/buraksezer/olric
sql level cache with reddis
https://github.com/zeromicro/go-zero
peer-aware-groupcache
https://github.com/robwil/peer-aware-groupcache
with k8 (*)
https://github.com/jmuk/groupcache https://github.com/udhos/kubegroup
https://github.com/jmuk/groupcache https://github.com/danielvegamyhre/minicache https://github.com/allegro/bigcache https://github.com/orijtech/groupcache
posts (why)
https://giedrius.blog/2022/03/04/distributed-systems-magic-groupcache-in-thanos/ https://www.mailgun.com/blog/it-and-engineering/golangs-superior-cache-solution-memcached-redis/?utm_source=pocket_reader https://medium.com/codex/our-go-cache-library-choices-406f2662d6b https://joshua.themarshians.com/post/doozer-groupcache/?utm_source=pocket_reader
posts (tech)
https://medium.com/orijtech-developers/groupcache-instrumented-by-opencensus-6a625c3724c
peer watch
$ helm install -n peer-aware-groupcache helm-chart/
$ kubectl scale --replicas=3 deployment/peer-aware-groupcache
$ export NODE_PORT=$(kubectl get --namespace default -o jsonpath="{.spec.ports[0].nodePort}" services
peer-aware-groupcache)
$ export NODE_IP=$(kubectl get nodes --namespace default -o jsonpath="{.items[0].status.addresses[0].address}")
$ for i in seq 0 9; do echo 1234$i; curl http://$NODE_IP:$NODE_PORT/factors?n=1234$i; done
mysql port
https://github.com/kataras/iris/tree/main/_examples/database/mysql?utm_source=pocket_saves
Directories