2nd lesson added
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d5ef4add57
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64
kubernetes/2/1.txt
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64
kubernetes/2/1.txt
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl apply -f 1.yaml
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pod/nginx-guaranteed created
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl get pod nginx-guaranteed -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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nginx-guaranteed 1/1 Running 0 2m4s 10.244.5.177 k8s-worker2 <none> <none>
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl describe pod nginx-guaranteed
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Name: nginx-guaranteed
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Namespace: default
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Priority: 0
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Service Account: default
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Node: k8s-worker2/192.168.88.229
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Start Time: Fri, 17 Oct 2025 13:04:17 +0300
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Labels: app=nginx
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Annotations: <none>
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Status: Running
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IP: 10.244.5.177
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IPs:
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IP: 10.244.5.177
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Containers:
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nginx:
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Container ID: cri-o://91d47234f22e127819396fe15654f9adafbc61fcd9fbb566f75427b6bd3d0c6e
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Image: nginx:latest
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Image ID: docker.io/library/nginx@sha256:35fabd32a7582bed5da0a40f41fd4984df7ddff32f81cd6be4614d07240ec115
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Port: <none>
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Host Port: <none>
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State: Running
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Started: Fri, 17 Oct 2025 13:04:23 +0300
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Ready: True
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Restart Count: 0
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Limits:
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cpu: 500m
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memory: 500Mi
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Requests:
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cpu: 500m
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memory: 500Mi
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Environment: <none>
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Mounts:
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/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-fshmj (ro)
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Conditions:
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Type Status
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PodReadyToStartContainers True
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Initialized True
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Ready True
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ContainersReady True
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PodScheduled True
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Volumes:
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kube-api-access-fshmj:
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Type: Projected (a volume that contains injected data from multiple sources)
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TokenExpirationSeconds: 3607
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ConfigMapName: kube-root-ca.crt
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Optional: false
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DownwardAPI: true
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QoS Class: Guaranteed
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Node-Selectors: <none>
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Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
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node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal Scheduled 2m32s default-scheduler Successfully assigned default/nginx-guaranteed to k8s-worker2
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Normal Pulling 2m31s kubelet Pulling image "nginx:latest"
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Normal Pulled 2m27s kubelet Successfully pulled image "nginx:latest" in 4.263s (4.263s including waiting). Image size: 163615579 bytes.
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Normal Created 2m26s kubelet Created container: nginx
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Normal Started 2m26s kubelet Started container nginx
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17
kubernetes/2/1.yaml
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17
kubernetes/2/1.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx-guaranteed
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:latest
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resources:
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requests:
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memory: "500Mi"
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cpu: "500m"
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limits:
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memory: "500Mi"
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cpu: "500m"
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7
kubernetes/2/2.txt
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7
kubernetes/2/2.txt
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl apply -f 2.yaml
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pod/nginx-busybox-burstable created
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl get pod nginx-busybox-burstable -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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nginx-busybox-burstable 2/2 Running 0 26s 10.244.7.183 k8s-worker0 <none> <none>
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl describe pod nginx-busybox-burstable | grep "QoS Class"
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QoS Class: Burstable
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27
kubernetes/2/2.yaml
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27
kubernetes/2/2.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx-busybox-burstable
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labels:
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app: demo-burstable
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spec:
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containers:
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- name: nginx
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image: nginx:stable
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resources:
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requests:
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memory: "300Mi"
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cpu: "200m"
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limits:
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memory: "600Mi"
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cpu: "500m"
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- name: busybox
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image: busybox
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command: ["sh", "-c", "sleep 3600"]
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resources:
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requests:
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memory: "100Mi"
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cpu: "50m"
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limits:
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memory: "200Mi"
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cpu: "150m"
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7
kubernetes/2/3.txt
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7
kubernetes/2/3.txt
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl apply -f 3.yaml
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pod/be-busybox created
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl get pod be-busybox -o wide
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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be-busybox 1/1 Running 0 29s 10.244.6.212 k8s-worker1 <none> <none>
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl describe pod be-busybox | grep "QoS Class"
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QoS Class: BestEffort
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11
kubernetes/2/3.yaml
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11
kubernetes/2/3.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: be-busybox
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labels:
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app: best-effort
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spec:
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containers:
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- name: busybox
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image: busybox:latest
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command: ["sleep", "3600"]
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21
kubernetes/2/4-pod0.yaml
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21
kubernetes/2/4-pod0.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: stress0
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labels:
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app: res-test
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spec:
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containers:
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- name: stress
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image: alpine:latest
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command: ["/bin/sh", "-c"]
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args:
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- apk add --no-cache stress-ng &&
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stress-ng --cpu 1
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resources:
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requests:
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cpu: "300m"
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memory: "300Mi"
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limits:
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cpu: "500m"
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memory: "500Mi"
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21
kubernetes/2/4-pod1.yaml
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21
kubernetes/2/4-pod1.yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: stress1
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labels:
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app: res-test
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spec:
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containers:
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- name: stress
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image: alpine:latest
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command: ["/bin/sh", "-c"]
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args:
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- apk add --no-cache stress-ng &&
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stress-ng --cpu 1
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resources:
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requests:
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cpu: "100m"
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memory: "100Mi"
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limits:
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cpu: "200m"
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memory: "200Mi"
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17
kubernetes/2/4.txt
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17
kubernetes/2/4.txt
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl apply -f 4-pod1.yaml
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pod/stress1 created
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl apply -f 4-pod0.yaml
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pod/stress0 created
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl get pods
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NAME READY STATUS RESTARTS AGE
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be-busybox 1/1 Running 0 36m
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nginx-busybox-burstable 2/2 Running 30 (34m ago) 30h
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nginx-guaranteed 1/1 Running 0 30h
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stress0 1/1 Running 0 6s
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stress1 1/1 Running 0 9s
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl top pod stress1
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NAME CPU(cores) MEMORY(bytes)
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stress1 190m 24Mi
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl top pod stress0
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NAME CPU(cores) MEMORY(bytes)
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stress0 501m 24Mi
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77
kubernetes/2/5.txt
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77
kubernetes/2/5.txt
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl describe pod oom
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Name: oom
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Namespace: default
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Priority: 0
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Service Account: default
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Node: k8s-worker1/192.168.88.230
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Start Time: Sun, 19 Oct 2025 21:37:46 +0300
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Labels: app=stress-ng-oom
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Annotations: <none>
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Status: Running
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IP: 10.244.6.219
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IPs:
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IP: 10.244.6.219
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Containers:
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oom:
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Container ID: cri-o://679b9544bf5c02ddb07f9e38693ba89e746444391dc1c0603ee29688716eba62
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Image: alpine:latest
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Image ID: docker.io/library/alpine@sha256:4b7ce07002c69e8f3d704a9c5d6fd3053be500b7f1c69fc0d80990c2ad8dd412
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Port: <none>
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Host Port: <none>
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Command:
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/bin/sh
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-c
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Args:
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apk add --no-cache stress-ng && stress-ng -m 1 --vm-bytes 256M
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State: Terminated
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Reason: OOMKilled
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Exit Code: 137
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Started: Sun, 19 Oct 2025 21:37:50 +0300
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Finished: Sun, 19 Oct 2025 21:37:52 +0300
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Ready: False
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Restart Count: 0
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Limits:
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memory: 200Mi
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Requests:
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memory: 100Mi
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Environment: <none>
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Mounts:
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/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-xkd2w (ro)
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Conditions:
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Type Status
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PodReadyToStartContainers True
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Initialized True
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Ready False
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ContainersReady False
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PodScheduled True
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Volumes:
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kube-api-access-xkd2w:
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Type: Projected (a volume that contains injected data from multiple sources)
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TokenExpirationSeconds: 3607
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ConfigMapName: kube-root-ca.crt
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Optional: false
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DownwardAPI: true
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QoS Class: Burstable
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Node-Selectors: <none>
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Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
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node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
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Events:
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Type Reason Age From Message
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---- ------ ---- ---- -------
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Normal Scheduled 9s default-scheduler Successfully assigned default/oom to k8s-worker1
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Normal Pulled 5s kubelet Successfully pulled image "alpine:latest" in 2.684s (2.684s including waiting). Image size: 8619075 bytes.
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Normal Created 5s kubelet Created container: oom
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Normal Started 5s kubelet Started container oom
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Normal Pulling 3s (x2 over 8s) kubelet Pulling image "alpine:latest"
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grape@lonetrek:~/Documents/devops/devops/kubernetes/2$ kubectl logs oom
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fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/main/x86_64/APKINDEX.tar.gz
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fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/community/x86_64/APKINDEX.tar.gz
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(1/5) Installing judy (1.0.5-r1)
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(2/5) Installing libmd (1.1.0-r0)
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(3/5) Installing libbsd (0.12.2-r0)
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(4/5) Installing liblksctp (1.0.19-r5)
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(5/5) Installing stress-ng (0.18.08-r0)
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Executing busybox-1.37.0-r19.trigger
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OK: 13 MiB in 21 packages
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stress-ng: info: [1] defaulting to a 1 day run per stressor
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stress-ng: info: [1] dispatching hogs: 1 vm
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19
kubernetes/2/5.yaml
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19
kubernetes/2/5.yaml
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@ -0,0 +1,19 @@
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apiVersion: v1
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kind: Pod
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metadata:
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name: oom
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labels:
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app: stress-ng-oom
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spec:
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containers:
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- name: oom
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image: alpine:latest
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command: ["/bin/sh", "-c"]
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args:
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- apk add --no-cache stress-ng &&
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stress-ng -m 1 --vm-bytes 256M
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resources:
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requests:
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memory: 100Mi
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limits:
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memory: 200Mi
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