Minikube

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sudo mkdir -p /opt/cli/minikube-linux-amd64/bin
sudo wget -cq https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64\
 -O /opt/cli/minikube-linux-amd64/bin/minikube

sudo chmod +x /opt/cli/minikube-linux-amd64/bin/minikube
sudo update-alternatives --install /usr/local/bin/minikube minikube\
 /opt/cli/minikube-linux-amd64/bin/minikube 1980
Order Port Type Internal IP Internal Port External IP External Port
1 TCP 0.0.0.0 32443 127.0.0.1 49153
2 TCP 0.0.0.0 8443 127.0.0.1 49154
3 TCP 0.0.0.0 5000 127.0.0.1 49155
4 TCP 0.0.0.0 2376 127.0.0.1 49156
5 TCP 0.0.0.0 22 127.0.0.1 49157

Kubectl

sudo mkdir -p /etc/apt/keyrings
sudo curl -fsSLo /etc/apt/keyrings/kubernetes-archive-keyring.gpg\
 https://packages.cloud.google.com/apt/doc/apt-key.gpg

cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list >/dev/null
deb [arch=$(dpkg --print-architecture)\
 signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg]\
 https://apt.kubernetes.io/ kubernetes-xenial main
EOF

sudo apt update
sudo apt install kubectl

Cluster

minikube start
:'
😄  minikube v1.29.0 on Ubuntu 22.04
✨  Automatically selected the docker driver. Other choices: kvm2, qemu2, none, ssh
📌  Using Docker driver with root privileges
👍  Starting control plane node minikube in cluster minikube
🚜  Pulling base image ...
💾  Downloading Kubernetes v1.26.1 preload ...
    > preloaded-images-k8s-v18-v1...:  397.05 MiB / 397.05 MiB  100.00% 33.42 M
    > gcr.io/k8s-minikube/kicbase...:  407.19 MiB / 407.19 MiB  100.00% 7.46 Mi
🔥  Creating docker container (CPUs=2, Memory=5900MB) ...
🐳  Preparing Kubernetes v1.26.1 on Docker 20.10.23 ...
    ▪ Generating certificates and keys ...
    ▪ Booting up control plane ...
    ▪ Configuring RBAC rules ...
🔗  Configuring bridge CNI (Container Networking Interface) ...
    ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5
🌟  Enabled addons: storage-provisioner, default-storageclass
🔎  Verifying Kubernetes components...
🏄  Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default
'

kubectl get po -A
minikube kubectl -- get po -A
:'
NAMESPACE     NAME                               READY   STATUS    RESTARTS        AGE
kube-system   coredns-64897985d-thxhw            1/1     Running   0               8m14s
kube-system   etcd-minikube                      1/1     Running   0               8m26s
kube-system   kube-apiserver-minikube            1/1     Running   0               8m26s
kube-system   kube-controller-manager-minikube   1/1     Running   0               8m26s
kube-system   kube-proxy-xqfl2                   1/1     Running   0               8m13s
kube-system   kube-scheduler-minikube            1/1     Running   0               8m26s
kube-system   storage-provisioner                1/1     Running   1 (7m43s ago)   8m25s
'

Dashboard

minikube addons enable metrics-server
minikube dashboard
:'
🔌  Enabling  ...
    ▪ Using image kubernetesui/metrics-scraper:v1.0.7
    ▪ Using image kubernetesui/dashboard:v2.3.1
🤔  Verifying dashboard health ...
🚀  Launching proxy ...
🤔  Verifying proxy health ...
🎉  Opening http://127.0.0.1:36403/api/v1/namespaces/kubernetes-dashboard/services/http:kubernetes-dashboard:/proxy/ in your default browser...
Gtk-Message: 17:34:36.652: Failed to load module "canberra-gtk-module"
Gtk-Message: 17:34:36.654: Failed to load module "canberra-gtk-module"
'

Deploy

Deployment/NodePort:
kubectl create deployment hello-minikube --image=k8s.gcr.io/echoserver:1.4
kubectl expose deployment hello-minikube --type=NodePort --port=8080

kubectl port-forward service/hello-minikube 7080:8080
http://localhost:7080/

kubectl get services      hello-minikube
kubectl delete services   hello-minikube
kubectl delete deployment hello-minikube

Deployment/LoadBalancer:
kubectl create deployment balanced --image=k8s.gcr.io/echoserver:1.4  
kubectl expose deployment balanced --type=LoadBalancer --port=8080

kubectl get services      balanced
kubectl delete services   balanced
kubectl delete deployment balanced

Example

docker build -t chorke/crawler:1.0.00 -f ./Dockerfile .
docker tag      chorke/crawler:1.0.00 reg.chorke.org/chorke/crawler:1.0.00
docker push     reg.chorke.org/chorke/crawler:1.0.00
docker pull     hub.chorke.org/chorke/crawler:1.0.00
docker tag      hub.chorke.org/chorke/crawler:1.0.00 chorke/crawler:1.0.00

minikube image load chorke/crawler:1.0.00
minikube image ls --format table

kubectl run crawler --image=chorke/crawler:1.0.00 --image-pull-policy=Never --restart=Never
kubectl logs crawler
kubectl get pod

kubectl delete pod crawler -n default
kubectl delete pod crawler

Deployment/NodePort:
kubectl create deployment crawler --image=chorke/crawler:1.0.00
kubectl expose deployment crawler --type=NodePort --port=1983

kubectl port-forward service/crawler 1983:1983
http://localhost:1983/crawler

kubectl get services      crawler
kubectl delete services   crawler
kubectl delete deployment crawler

Ingress DNS

minikube start
cat /etc/resolv.conf | grep nameserver

minikube addons enable ingress
minikube addons enable ingress-dns

nslookup academia.local
nslookup academia.local $(minikube ip)

kubectl get configmap coredns -n kube-system -o yaml
kubectl get configmap coredns -n kube-system -o "jsonpath={.data.Corefile}"

Volatile Fixes 

RESOLVE='/etc/resolv.conf';\
printf -v K8S_DNS '%s' $(minikube ip);\
if  [ -f ${RESOLVE} ]&&[ "$(grep -c ${K8S_DNS} ${RESOLVE})" == 0 ];then\
 cat << EOF | sudo tee -a ${RESOLVE} >/dev/null

nameserver ${K8S_DNS}
EOF
fi;\
cat ${RESOLVE}

Robust Fixes 

RESOLVE='/etc/systemd/resolved.conf';\
printf -v K8S_DNS '%s' $(minikube ip);\
if  [ -f ${RESOLVE} ]&&[ "$(grep -c ${K8S_DNS} ${RESOLVE})" == 0 ];then\
 cat << EOF | sudo tee -a ${RESOLVE} >/dev/null

# k8s coredns
DNS=${K8S_DNS}
EOF
fi;\
cat ${RESOLVE}
sudo systemctl restart systemd-resolved
sudo systemctl status  systemd-resolved

sudo systemctl restart NetworkManager.service
systemctl status NetworkManager.service
systemctl status systemd-resolved
systemctl status dnsmasq

cat /etc/resolv.conf | grep nameserver
nmcli dev show | grep DNS
journalctl -u dnsmasq
tail /var/log/syslog

kubectl edit configmap coredns -n kube-system

apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors

        reload
        loadbalance
    }
    k8s.local:53 {
        errors
        cache 30
        forward . 192.168.49.2
    }
    academia.local:53 {
        errors
        cache 30
        forward . 192.168.49.2
    }
kind: ConfigMap
metadata:
  creationTimestamp: "2023-07-04T00:08:54Z"
  name: coredns
  namespace: kube-system
  resourceVersion: "300"
  uid: d8eec45d-1452-467f-8861-8811658c773a

kubectl run -i --tty --rm debug --image=busybox --restart=Never -- nslookup academia.local
kubectl run -i --tty --rm debug --image=busybox --restart=Never -- ping academia.local

kubectl run -i --tty --rm debug --image=alpine  --restart=Never -- nslookup academia.local
kubectl run -i --tty --rm debug --image=alpine  --restart=Never -- ping academia.local

Ingress DNS » Dashboard

cat <<EOF | kubectl apply -n kubernetes-dashboard -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: kubernetes-dashboard
  labels:
    helm.sh/chart: kubernetes-dashboard-1.0.0
    app.kubernetes.io/name: kubernetes-dashboard
    app.kubernetes.io/instance: kubernetes-dashboard
    app.kubernetes.io/version: "1.0.0"
    app.kubernetes.io/managed-by: Helm
spec:
  ingressClassName: nginx
  rules:
    - host: "www.k8s.local"
      http:
        paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: kubernetes-dashboard
                port:
                  number: 80
EOF

cat <<EOF | kubectl delete -n kubernetes-dashboard -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: kubernetes-dashboard
  labels:
    helm.sh/chart: kubernetes-dashboard-1.0.0
    app.kubernetes.io/name: kubernetes-dashboard
    app.kubernetes.io/instance: kubernetes-dashboard
    app.kubernetes.io/version: "1.0.0"
    app.kubernetes.io/managed-by: Helm
spec:
  ingressClassName: nginx
  rules:
    - host: "www.k8s.local"
      http:
        paths:
          - path: /
            pathType: ImplementationSpecific
            backend:
              service:
                name: kubernetes-dashboard
                port:
                  number: 80
EOF

Playground

minikube image rm docker.io/jenkins/jenkins:2.452.1-jdk17
minikube image ls

minikube config view host-only-cidr
minikube config get  host-only-cidr

minikube config list
minikube status

minikube config set memory 16384
minikube config get memory

minikube config view  memory
minikube config unset memory

Knowledge

minikube stop
minikube start
minikube pause

minikube delete
minikube unpause
minikube addons list
minikube delete --all

minikube docker-env
minikube image ls --format table
minikube config set memory 16384
 
minikube start --cpus 8 --memory 16384
eval $(minikube -p minikube docker-env)
minikube start -p aged --kubernetes-version=v1.16.1
minikube start -p aged --kubernetes-version=v1.24.0

docker ps -a
docker images
docker image ls
docker network ls

docker rm $(docker ps -a -q)
docker stop $(docker ps -a -q)

docker build\
 -t chorke/crawler:1.0.00 -f ./Dockerfile .

docker logs crawler
docker stop crawler && docker rm crawler

kubectl get pod
kubectl cluster-info
kubectl get namespaces
kubectl -n kube-system get svc -o wide

minikube image ls --format table
minikube image load chorke/crawler:1.0.00

kubectl run crawler --image=chorke/crawler:1.0.00\
 --image-pull-policy=Never --restart=Never

kubectl logs crawler
kubectl delete pod crawler

docker container inspect minikube \
--format="{{ (index (index .NetworkSettings.Ports \"8443/tcp\") 0).HostPort }}"

docker container ls --filter=name=minikube --format="{{.Ports}}" | tr , \\n

kubectl get po -A
kubectl explain pods
kubectl get services
kubectl get services crawler
kubectl describe pods crawler
kubectl get pods --all-namespaces

kubectl get services
kubectl get services -n default
kubectl get services --all-namespaces

kubectl delete pod crawler
kubectl delete -n default pod crawler

kubectl delete services crawler
kubectl delete deployment crawler

kubectl get nodes
kubectl get pods -o wide
kubectl get po,jobs,cronjob

minikube kubectl -- get po -A
minikube kubectl -- explain pods
minikube kubectl -- get services
minikube kubectl -- get service crawler
minikube kubectl -- describe pods crawler
minikube kubectl -- get pods --all-namespaces 

minikube service --all
minikube service list -n default
minikube service list

minikube kubectl -- delete pod crawler
minikube kubectl -- delete -n default pod crawler

minikube kubectl -- delete services crawler
minikube kubectl -- delete deployment crawler

minikube kubectl -- get nodes
minikube kubectl -- get pods -o wide
minikube kubectl -- get po,jobs,cronjob

minikube addons enable metallb
minikube addons enable olm
minikube addons list

minikube addons enable default-storageclass
minikube addons enable metrics-server
minikube addons configure metallb

minikube addons enable storage-provisioner
minikube addons enable dashboard

minikube ssh

minikube addons enable ingress-dns
minikube addons enable ingress

ping host.minikube.internal

kubectl get configmap coredns -n kube-system -o yaml
nslookup academia.local $(minikube ip)

getconf _NPROCESSORS_CONF
getconf _NPROCESSORS_ONLN
nproc --all

grep ^cpu\\scores /proc/cpuinfo | uniq |  awk '{print $4}'
python -c 'import os; print(os.cpu_count())'
grep -c ^processor /proc/cpuinfo

awk '/^MemAvailable:/ { print $2/1024; }' /proc/meminfo
awk '/^MemTotal:/ { print $2/1024; }' /proc/meminfo
awk '/^MemFree:/ { print $2/1024; }' /proc/meminfo

References

Retrieved from "https://cdn.chorke.org/weke/index.php?title=Minikube&oldid=11788"