Upd1. New version. Didn't check yet https://www.youtube.com/watch?v=2aJSAzLW6fg
Upd2. New version. Didn't check yet https://www.youtube.com/watch?v=dwm1j_fKICU
kubectl installation:
$ curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
$ sudo vi /etc/hosts
#---------------------------------------------------------------------
# Kubernetes cluster
#---------------------------------------------------------------------
192.168.0.10 master.k8s master
192.168.0.11 node1.k8s node1
192.168.0.12 node2.k8s node2
$ vagrant plugin install vagrant-hostmanager
$ mkdir ~/vagrant-kubernetes-ubuntu-20 && cd ~/vagrant-kubernetes-ubuntu-20
$ git clone https://github.com/webmakaka/vagrant-kubernetes-3-node-cluster-ubuntu-20.04 .
$ cd latest
$ vagrant box update
$ vagrant up
$ vagrant status
Current machine states:
master.k8s running (virtualbox)
node1.k8s running (virtualbox)
node2.k8s running (virtualbox)
$ mkdir -p ~/.kube
// root password: kubeadmin
$ scp root@master:/etc/kubernetes/admin.conf ~/.kube/config
$ kubectl version --short
Client Version: v1.20.2
Server Version: v1.20.2
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 12m v1.20.2
node1 Ready <none> 7m10s v1.20.2
node2 Ready <none> 101s v1.20.2
$ kubectl get po -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-57fc9c76cc-z8z69 1/1 Running 0 12m
calico-node-kmjdc 1/1 Running 0 7m27s
calico-node-skkvh 1/1 Running 0 12m
calico-node-skrmb 1/1 Running 0 119s
coredns-74ff55c5b-9sshg 1/1 Running 0 12m
coredns-74ff55c5b-cmzq5 1/1 Running 0 12m
etcd-master 1/1 Running 0 12m
kube-apiserver-master 1/1 Running 0 12m
kube-controller-manager-master 1/1 Running 0 12m
kube-proxy-2nvst 1/1 Running 0 12m
kube-proxy-nvl5m 1/1 Running 0 7m27s
kube-proxy-ssngv 1/1 Running 0 119s
kube-scheduler-master 1/1 Running 0 12m
$ kubectl cluster-info
Kubernetes control plane is running at https://192.168.0.10:6443
KubeDNS is running at https://192.168.0.10:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
$ kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Unhealthy Get "http://127.0.0.1:10252/healthz": dial tcp 127.0.0.1:10252: connect: connection refused
scheduler Unhealthy Get "http://127.0.0.1:10251/healthz": dial tcp 127.0.0.1:10251: connect: connection refused
etcd-0 Healthy {"health":"true"}
$ cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
name: nodejs-cats-app
spec:
replicas: 3
selector:
matchLabels:
app: nodejs-cats-app
template:
metadata:
labels:
app: nodejs-cats-app
env: dev
spec:
containers:
- name: nodejs-cats-app
image: webmakaka/cats-app
imagePullPolicy: Always
ports:
- containerPort: 8080
EOF
$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
name: nodejs-cats-app-nodeport
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
nodePort: 30123
selector:
app: nodejs-cats-app
EOF
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nodejs-cats-app-56cc7754f-ghvzq 1/1 Running 0 25s
nodejs-cats-app-56cc7754f-r2c95 1/1 Running 0 25s
nodejs-cats-app-56cc7754f-vjnfb 1/1 Running 0 25s
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 14m
nodejs-cats-app-nodeport NodePort 10.105.129.237 <none> 80:30123/TCP 30s
Should work
http://node1.k8s:30123
http://node2.k8s:30123
// Delete created resources
// $ kubectl delete svc nodejs-cats-app-nodeport
// $ kubectl delete deployment nodejs-cats-app
https://www.youtube.com/watch?v=2SmYjj-GFnE
https://metallb.universe.tf/installation/
$ LATEST_VERSION=$(curl --silent "https://api.github.com/repos/metallb/metallb/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/')
$ echo ${LATEST_VERSION}
$ kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/${LATEST_VERSION}/manifests/namespace.yaml
$ kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/${LATEST_VERSION}/manifests/metallb.yaml
# On first install only
$ kubectl create secret generic -n metallb-system memberlist --from-literal=secretkey="$(openssl rand -base64 128)"
$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ConfigMap
metadata:
namespace: metallb-system
name: config
data:
config: |
address-pools:
- name: default
protocol: layer2
addresses:
- 192.168.0.21-192.168.0.50
EOF
$ kubectl get pods -n metallb-system
NAME READY STATUS RESTARTS AGE
controller-65db86ddc6-glpk9 1/1 Running 0 2m7s
speaker-26rbj 1/1 Running 0 2m7s
speaker-7485w 1/1 Running 0 2m7s
speaker-mvdnb 1/1 Running 0 2m7s
$ cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
name: cats-app-deployment
labels:
app: cats-app
spec:
replicas: 3
selector:
matchLabels:
app: cats-app
template:
metadata:
labels:
app: cats-app
spec:
containers:
- name: cats-app
image: webmakaka/cats-app:latest
ports:
- containerPort: 8080
EOF
$ kubectl expose deploy cats-app --port 80 --target-port 8080 --type LoadBalancer
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
cats-app LoadBalancer 10.98.196.136 192.168.0.21 80:30520/TCP 5s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 86m
https://www.youtube.com/watch?v=UvwtALIb2U8
https://kubernetes.github.io/ingress-nginx/deploy/
$ curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
$ helm version --short --client
v3.4.2+g23dd3af
$ helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
$ helm repo update
$ kubectl create ns ingress-nginx
$ helm show values ingress-nginx/ingress-nginx > /tmp/ingress-nginx.yaml
$ vi /tmp/ingress-nginx.yaml +54
hostNetwork: true
****
hostPort:
enabled: true
$ vi /tmp/ingress-nginx.yaml +144
kind: Deployment
kind: DaemonSet
$ helm install ingress-nginx \
ingress-nginx/ingress-nginx \
-n ingress-nginx \
--values /tmp/ingress-nginx.yaml
$ helm list -n ingress-nginx
NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION
ingress-nginx ingress-nginx 1 2021-01-14 16:39:12.652014803 +0300 MSK deployed ingress-nginx-3.20.1 0.43.0
$ kubectl get all
NAME READY STATUS RESTARTS AGE
pod/cats-app-595964467d-bx2l8 1/1 Running 0 16m
pod/cats-app-595964467d-j5qwq 1/1 Running 0 16m
pod/cats-app-595964467d-rgqrr 1/1 Running 0 16m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/cats-app LoadBalancer 10.101.35.242 192.168.0.21 80:30570/TCP 15m
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 43m
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/cats-app 3/3 3 3 16m
NAME DESIRED CURRENT READY AGE
replicaset.apps/cats-app-595964467d 3 3 3 16m
$ cat <<EOF | kubectl apply -f -
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-cats-app
spec:
rules:
- host: cats.app
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: cats-app-deployment
port:
number: 80
EOF
$ kubectl get ing
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress-cats-app <none> cats.app 80 52s
$ kubectl -n ingress-nginx get all
$ kubectl -n ingress-nginx get all
NAME READY STATUS RESTARTS AGE
pod/ingress-nginx-controller-g6b8d 1/1 Running 0 14m
pod/ingress-nginx-controller-kfj5d 1/1 Running 0 14m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/ingress-nginx-controller LoadBalancer 10.109.73.155 192.168.0.22 80:31143/TCP,443:32332/TCP 14m
service/ingress-nginx-controller-admission ClusterIP 10.105.83.58 <none> 443/TCP 14m
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
daemonset.apps/ingress-nginx-controller 2 2 2 2 2 kubernetes.io/os=linux 14m
Add EXTERNAL-IP to hosts file
$ sudo vi /etc/hosts
***
192.168.0.22 cats.app
chrome browser: cats.app
type: thisisunsafe in the browser window with security warning.
Original src:
https://github.com/justmeandopensource/kubernetes
How to run original:
https://www.youtube.com/watch?v=AoEWX84h_ig
Marley
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