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devops:laboratoare:05 [2021/07/28 15:46] bogdan.croitoru |
devops:laboratoare:05 [2021/07/28 16:54] (current) bogdan.croitoru |
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| Line 8: | Line 8: | ||
| <note>mkdir ~/.kube | <note>mkdir ~/.kube | ||
| + | |||
| cp config ~/.kube | cp config ~/.kube | ||
| - | $ kubectl get nodes</note> | + | kubectl get nodes</note> |
| * Observam contextul actual folosit | * Observam contextul actual folosit | ||
| Line 116: | Line 117: | ||
| <note>cd ../Laborator2</note> | <note>cd ../Laborator2</note> | ||
| + | |||
| + | ==== 5.2. Deployments, stateless/stateful ==== | ||
| + | |||
| + | === Deployments - de obicei folosit de aplicatii stateless === | ||
| + | |||
| + | * Creeaza primul tau deployment folosind commanda urmatoare: | ||
| + | |||
| + | <note>kubectl apply -f deploy-01.yaml</note> | ||
| + | |||
| + | * Observam detaliile deployment-ului | ||
| + | |||
| + | <note>kubectl get deployments | ||
| + | |||
| + | kubectl get pods | ||
| + | |||
| + | kubectl get replicaset</note> | ||
| + | |||
| + | * Scalam deployment-ul in sus, crescand numarul de replici | ||
| + | <note>kubectl scale deployments/nginx-deployment --replicas=4 | ||
| + | |||
| + | kubectl get pods -o wide # vom vedea 4 pod-uri</note> | ||
| + | * Scalam deployment-ul in jos. Reducem numarul de pod-uri | ||
| + | <note>kubectl scale deployments/nginx-deployment --replicas=2 | ||
| + | |||
| + | kubectl get pods -o wide</note> | ||
| + | |||
| + | * Schimbam imaginea folosita in deployment utilizand comanda urmatoare: | ||
| + | |||
| + | <note>kubectl set image deployments/nginx-deployment nginx=nginx:1.9.1</note> | ||
| + | |||
| + | * Facem revert la deployment-ul anterior cu imaginea de docker anterioara | ||
| + | |||
| + | <note>kubectl rollout undo deployments/nginx-deployment | ||
| + | |||
| + | kubectl rollout status deployments/nginx-deployment | ||
| + | |||
| + | kubectl describe deploy nginx-deployment | ||
| + | </note> | ||
| + | |||
| + | * Stergem deployment-ul | ||
| + | |||
| + | <note>kubectl delete deployment nginx-deployment</note> | ||
| + | |||
| + | === Statefulset - aplicatii stateful === | ||
| + | |||
| + | * Pe fiecare masina student exista instalat si configurat nfs server cu export-urile: | ||
| + | |||
| + | <note>/exports/data-0001 | ||
| + | /exports/data-0002</note> | ||
| + | |||
| + | * Verificam ca functioneaza mount-urile: | ||
| + | |||
| + | <note>sudo showmount -e localhost</note> | ||
| + | |||
| + | * Fiecare student va folosi propria adresa ip, mai departe in cadrul acestui laborator. | ||
| + | * Adresa ip poate fi obtinuta folosind comanda de mai jos | ||
| + | |||
| + | <note>ip -f inet addr show ens3</note> | ||
| + | |||
| + | * Editati fisierele nfs-0001.yaml si nfs-0002.yaml, adaugand adresa ip proprie in campul spec.nfs.server si actualizati campul metadata.name cu id-ul de student aferent. | ||
| + | |||
| + | * Cream volume persistente astfel: | ||
| + | |||
| + | <note>kubectl apply -f nfs-0001.yaml | ||
| + | |||
| + | kubectl apply -f nfs-0002.yaml</note> | ||
| + | |||
| + | * Observam volumele create | ||
| + | |||
| + | <note>kubectl get pv | grep studentid | ||
| + | |||
| + | kubectl describe pv <pv_name></note> | ||
| + | |||
| + | * Cream un statefulset folosind comanda de mai jos: | ||
| + | |||
| + | <note>kubectl apply -f statefulset-01.yaml</note> | ||
| + | |||
| + | * Observam statefulset-ul creat | ||
| + | |||
| + | <note>kubectl get statefulset | ||
| + | |||
| + | kubectl describe statefulset | ||
| + | |||
| + | kubectl get pods</note> | ||
| + | |||
| + | * Verificam ca datele de pe disk sunt disponibile in container | ||
| + | |||
| + | * Scriem date in volumele de pe disk | ||
| + | |||
| + | echo 'Hello World' /exports/data-0001/index.html | ||
| + | echo "Hello $USER" > /exports/data-0002/index.html | ||
| + | |||
| + | * Verificam in pod-uri. Comenzile urmatoare ar trebui sa afiseze continutul fisierului index.html de pe disk | ||
| + | |||
| + | <note>kubectl exec -it web-0 -- cat /usr/share/nginx/html/index.html | ||
| + | |||
| + | kubectl exec -it web-1 -- cat /usr/share/nginx/html/index.html</note> | ||
| + | |||
| + | * Cream un serviciu care sa acceseze statefulset-ul | ||
| + | |||
| + | <note>kubectl create -f service.yaml</note> | ||
| + | |||
| + | * Observam cum serviciul se conecteaza la backend (campul Endpoints:) | ||
| + | |||
| + | <note>kubectl describe svc nginx</note> | ||
| + | |||
| + | * Curatam mediul | ||
| + | |||
| + | <note>kubectl delete -f statefulset-01.yaml</note> | ||
| + | |||
| + | * Trecem la urmatorea parte din laborator | ||
| + | |||
| + | <note>cd ../Laborator3</note> | ||
| + | |||
| + | ==== 5.3. Daemonsets ==== | ||
| + | |||
| + | * Daemonset-urile sunt resurse stateless, folosite pentru a putea rula, spre exemplu, un proces pe toate nodurile din cluster. | ||
| + | * Daemonset-urile se asigura ca anumite nod-uri Kubernetes sau chiar toate ruleaza o copie a unui pod. | ||
| + | * Editam continutul fisierului daemonset.yaml, actualizand "student[id]" cu id-ul corespunzator | ||
| + | |||
| + | <note>vi daemonset.yaml</note> | ||
| + | |||
| + | * Aplicam fisierul "daemonset.yaml" | ||
| + | |||
| + | <note>kubectl apply -f daemonset.yaml</note> | ||
| + | |||
| + | * Verificam ca pod-urile au pornit. Vom vedea ca s-au creat 3 pod-uri, cate unul pe fiecare worker node. | ||
| + | |||
| + | <note>kubectl get pods -owide | ||
| + | kubectl describe daemonset daemonset-studentid</note> | ||
| + | |||
| + | * Editam fisierul "daemonset.yaml", decomentam liniile 16,17 si 18 . | ||
| + | |||
| + | <note>vi daemonset.yaml</note> | ||
| + | |||
| + | * Aplicam din nou fisierul "daemonset.yaml" | ||
| + | |||
| + | <note>kubectl apply -f daemonset.yaml</note> | ||
| + | |||
| + | * Unordered List ItemVerificam starea daemonset-ului si a pod-urilor. Observam ca s-a creat un pod si pe nodul master. | ||
| + | |||
| + | <note>kubectl get daemonset | ||
| + | kubectl get pods -owide</note> | ||
| + | |||
| + | * Incercati sa stergeti un pod creat de daemonset. | ||
| + | |||
| + | <note>kubectl delete pod daemonset-student[id]-xxxxx</note> | ||
| + | |||
| + | * Curatam mediul | ||
| + | |||
| + | <note>kubectl delete daemonset daemonset-student[id]</note> | ||
| + | sau | ||
| + | <note>kubectl delete -f daemonset.yaml</note> | ||
| + | |||
