Rancher

Lightweight Kubernetes : The certified Kubernetes distribution built for IoT & Edge computing 특징 https://k3s.io/{:target="_blank"} Kubernetes의 경량화 버전으로 아래와 같은 특징 기본 설치만으로 바로 배포 테스트 가능 Overlay Netowrk(Flannel), Load balancer, Ingress(Traefik), CoreDNS 등이 기본 설치 됨 https://rancher.com/docs/k3s/latest/en/networking/{:target="_blank"} etcd 대신 sqlite 운영 High Availability with an External DB High Availability with Embedded DB (Experimental) Master node schedulable uncordon 제외 가능 Worker node 필요 없음 (필요시 추가 가능) 사용 목적 Edge Computing 개발 테스트 및 스테이징 서버 구성 기타 어플리케이션 테스트 용 Master 설치 설치 curl -sfL https://get.k3s.io | sh - 실행으로 끝 systemd 관리 kubectl 설치 및 심볼릭 링크 설정 해줌 이미 kubectl 가 설치 되어 있는 경우는 심볼릭 링크 실패 # alias 필요시 아래 참고 $ alias kubectl='sudo k3s kubectl' # Install $ curl -sfL https://get.k3s.io | sh - # master node $ kubectl get node NAME STATUS ROLES AGE VERSION centos1 Ready control-plane,master 37s v1.21.3+k3s1 $ kubectl get pod -A NAMESPACE NAME READY STATUS RESTARTS AGE kube-system local-path-provisioner-5ff76fc89d-wh9cg 1/1 Running 0 2m35s kube-system coredns-7448499f4d-2d7pb 1/1 Running 0 2m35s kube-system metrics-server-86cbb8457f-x9l6n 1/1 Running 0 2m35s kube-system helm-install-traefik-crd-w27q7 0/1 Completed 0 2m35s kube-system helm-install-traefik-2zllj 0/1 Completed 1 2m35s kube-system svclb-traefik-55qfd 2/2 Running 0 113s kube-system traefik-97b44b794-smzl9 1/1 Running 0 114s K8S 서비스 테스트 서비스 타입 : NodePort https://kubernetes.github.io/ingress-nginx/deploy/baremetal/{:target="_blank"} apiVersion: apps/v1 kind: Deployment metadata: name: mvcapp spec: selector: matchLabels: app: mvcapp replicas: 2 # --replicas=2 옵션과 동일 template: metadata: labels: app: mvcapp spec: containers: - name: mvcapp image: cdecl/mvcapp:0.6 ports: - containerPort: 80 --- apiVersion: v1 kind: Service metadata: name: mvcapp spec: type: NodePort selector: app: mvcapp ports: - port: 80 targetPort: 80 $ kubectl apply -f mvcapp-deploy-service.yaml deployment.apps/mvcapp created service/mvcapp created $ kubectl get pod -A NAMESPACE NAME READY STATUS RESTARTS AGE kube-system local-path-provisioner-5ff76fc89d-wh9cg 1/1 Running 0 9m29s kube-system coredns-7448499f4d-2d7pb 1/1 Running 0 9m29s kube-system metrics-server-86cbb8457f-x9l6n 1/1 Running 0 9m29s kube-system helm-install-traefik-crd-w27q7 0/1 Completed 0 9m29s kube-system helm-install-traefik-2zllj 0/1 Completed 1 9m29s kube-system svclb-traefik-55qfd 2/2 Running 0 8m47s kube-system traefik-97b44b794-smzl9 1/1 Running 0 8m48s default mvcapp-79874d888c-6htvq 1/1 Running 0 62s default mvcapp-79874d888c-clslc 1/1 Running 0 62s $ kubectl get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.43.0.1 <none> 443/TCP 10m mvcapp NodePort 10.43.36.139 <none> 80:32105/TCP 106s # Nodeport IP $ curl 10.43.36.139:80 * Project : Mvcapp * Version : 0.5 / net5.0 * Hostname : mvcapp-79874d888c-6htvq * RemoteAddr : 10.42.0.1 * X-Forwarded-For : * Request Count : 1 * User-Agent : curl/7.29.0 $ curl localhost:32105 * Project : Mvcapp * Version : 0.5 / net5.0 * Hostname : mvcapp-79874d888c-clslc * RemoteAddr : 10.42.0.1 * X-Forwarded-For : * Request Count : 1 * User-Agent : curl/7.29.0 Agent 추가 Master Node만으로도 테스트 가능하나 Scale 테스트시 Agent(Worker Node) 추가 가능 환경변수 세팅 : 필요시 참고 $ sudo cat /var/lib/rancher/k3s/server/node-token > ~/.node-token $ K3S_TOKEN=$(< ~/.node-token) $ HOST_IP=$(ip a | sed -rn 's/.*inet ([0-9\.]+).*eth0/\1/p') Agent 등록 : 원격실행 OR Agent 머신에서 실행 HostIP, Token 정보 필요 (위 환경변수 세팅 참고) # Agent 머신에서 실행 $ curl -sfL https://get.k3s.io | K3S_URL=https://$HOST_IP:6443 K3S_TOKEN=$K3S_TOKEN sh - # Agent 추가 다른방법 $ ansible node01 -m shell -a "curl -sfL https://get.k3s.io | sh -s - agent --server https://$HOST_IP:6443 --token $K3S_TOKEN" -v K3S 삭제 ls /usr/local/bin/k3s-* | xargs -n1 sh -