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--- система_kubernetes [2025/03/18 15:04]
val [Работа со своим репозиторием]
+++ система_kubernetes [2025/03/31 13:51] (current)
val [Metrics Server]
@@ Line 25: / Line 25: @@
   * [[https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands]]
+  * [[https://kubernetes.io/ru/docs/reference/kubectl/cheatsheet/|Шпаргалка по kubectl]]
 ==== Установка ====
@@ Line 457: / Line 458: @@
 ~/kubespray# cat inventory/mycluster/hosts.yaml
 </code><code>
+all:
+  hosts:
 ...
-    node4:
+    kube4:
-      ansible_host: 192.168.X.204
-      ip: 192.168.X.204
-      access_ip: 192.168.X.204
 ...
     kube_node:
+      hosts:
 ...
-        node4:
+        kube4:
 ...
 </code><code>
+(venv1) server:~/kubespray# time ansible-playbook -i inventory/mycluster/hosts.yaml cluster.yml
+real    6m31.562s
-~/kubespray# time ansible-playbook -i inventory/mycluster/hosts.yaml --limit=kube4 scale.yml
+~/kubespray# ###time ansible-playbook -i inventory/mycluster/hosts.yaml --limit=kube4 scale.yml
 real    17m37.459s
@@ Line 516: / Line 519: @@
 <code>
 $ kubectl api-resources
-$ kubectl run my-debian --image=debian -- "sleep" "3600"
 $ ###kubectl run -ti --rm my-debian --image=debian --overrides='{"spec": { "nodeSelector": {"kubernetes.io/hostname": "kube4"}}}'
+$ kubectl run my-debian --image=debian -- "sleep" "60"
 $ kubectl get pods
@@ Line 579: / Line 582: @@
         image: debian
         command: ["/bin/sh"]
-        args: ["-c", "while true; do echo hello; sleep 3;done"]
+        args: ["-c", "while :;do echo -n random-value:;od -A n -t d -N 1 /dev/urandom;sleep 5; done"]
+        resources:
+          requests:
+            memory: "64Mi"
+            cpu: "250m"
+          limits:
+            memory: "128Mi"
+            cpu: "500m"
       restartPolicy: Always
 </code><code>
 $ kubectl apply -f my-debian-deployment.yaml #--dry-run=client #-o yaml
+$ kubectl logs -l app=my-debian -f
 ...
 $ kubectl delete -f my-debian-deployment.yaml
@@ Line 666: / Line 678: @@
 #            port: 80
 #            #scheme: HTTPS
-#        resources:
-#          requests:
-#            memory: "64Mi"
-#            cpu: "250m"
-#          limits:
-#            memory: "128Mi"
-#            cpu: "500m"
 #        volumeMounts:
@@ Line 981: / Line 984: @@
 node1# ###kubectl delete -f ingress-nginx.controller-v1.3.1.baremetal.yaml
-</code>
-=== Управление конфигурацией ingress-nginx-controller  ===
-<code>
-master-1:~$ kubectl exec -n ingress-nginx pods/ingress-nginx-controller-<TAB> -- cat /etc/nginx/nginx.conf | tee nginx.conf
-master-1:~$ kubectl edit -n ingress-nginx configmaps ingress-nginx-controller
-</code><code>
-...
-data:
-  use-forwarded-headers: "true"
-...
 </code>
@@ Line 1035: / Line 1026: @@
 </code><code>
 kube1:~/ingress-nginx# ###kubectl delete -f ingress-nginx.controller-v1.12.0.baremetal.yaml
+</code>
+=== Управление конфигурацией ingress-nginx-controller  ===
+<code>
+master-1:~$ kubectl exec -n ingress-nginx pods/ingress-nginx-controller-<TAB> -- cat /etc/nginx/nginx.conf | tee nginx.conf
+master-1:~$ kubectl edit -n ingress-nginx configmaps ingress-nginx-controller
+</code><code>
+...
+data:
+  use-forwarded-headers: "true"
+...
 </code>
@@ Line 1149: / Line 1152: @@
 </code>
-=== PersistentVolume и PersistentVolumeVolumeClaim ===
+=== PersistentVolume и PersistentVolumeClaim ===
   * [[https://qna.habr.com/q/629022|Несколько Claim на один Persistent Volumes?]]
@@ Line 1342: / Line 1345: @@
 <code>
 kubeN:~# apt install open-iscsi
+(venv1) server:~# ansible all -f 4 -m apt -a 'pkg=open-iscsi state=present update_cache=true' -i /root/kubespray/inventory/mycluster/hosts.yaml
 </code>
   * [[https://github.com/longhorn/longhorn]]
@@ Line 2099: / Line 2104: @@
   * http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/
+===== Мониторинг =====
+==== Metrics Server ====
+  * [[https://kubernetes-sigs.github.io/metrics-server/Kubernetes Metrics Server]]
+  * [[https://medium.com/@cloudspinx/fix-error-metrics-api-not-available-in-kubernetes-aa10766e1c2f|Fix “error: Metrics API not available” in Kubernetes]]
+<code>
+kube1:~/metrics-server# curl -L https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.7.2/components.yaml | tee metrics-server-components.yaml
+kube1:~/metrics-server# cat metrics-server-components.yaml
+</code><code>
+...
+      containers:
+      - args:
+        - --cert-dir=/tmp
+        - --kubelet-insecure-tls   # add this
+...
+</code><code>
+kube1:~/metrics-server# kubectl apply -f metrics-server-components.yaml
+kube1# kubectl get pods -A | grep metrics-server
+kube1# kubectl top pod #-n kube-system
+kube1# kubectl top pod -A --sort-by=memory
+kube1# kubectl top node
+</code>
+==== kube-state-metrics ====
+  * [[https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-state-metrics]]
+<code>
+kube1# helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+kube1# helm repo update
+kube1# helm install kube-state-metrics prometheus-community/kube-state-metrics -n vm --create-namespace
+kube1# curl kube-state-metrics.vm.svc.cluster.local:8080/metrics
+</code>
 ===== Отладка, troubleshooting =====

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