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Merge pull request #10 from kolayne-IU-assignments/lab10
Lab10
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‎k8s/HELM.md

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# Helm
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## Helm chart
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```
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$ kubectl get pods,svc
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NAME READY STATUS RESTARTS AGE
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pod/app-py-774b8c9bc-4zqvs 1/1 Running 0 20s
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pod/app-py-774b8c9bc-6tg64 1/1 Running 0 4m57s
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pod/app-py-774b8c9bc-mhm8j 1/1 Running 0 4m57s
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pod/app-py-774b8c9bc-zsb2b 1/1 Running 0 4m57s
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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service/app-py LoadBalancer 10.106.188.219 <pending> 5000:30928/TCP 4m57s
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service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21m
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$
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```
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## Helm hooks
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```
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$ kubectl get po
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NAME READY STATUS RESTARTS AGE
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app-py-774b8c9bc-2rfbf 1/1 Running 0 86s
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app-py-774b8c9bc-6dz7d 1/1 Running 0 86s
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app-py-774b8c9bc-bzpqf 1/1 Running 0 86s
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app-py-774b8c9bc-z9l76 1/1 Running 0 86s
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post-install-hook 0/1 Completed 0 86s
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pre-install-hook 0/1 Completed 0 100s
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$ kubectl describe po pre-install-hook
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Name: pre-install-hook
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Namespace: default
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Priority: 0
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Service Account: default
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Node: minikube/192.168.49.2
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Start Time: Sun, 31 Mar 2024 22:15:29 +0300
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Labels: <none>
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Annotations: helm.sh/hook: pre-install
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Status: Succeeded
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IP: 10.244.0.25
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IPs:
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IP: 10.244.0.25
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Containers:
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sleep-5:
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Container ID: docker://dd1fcb8f5e49cb0a4b655c1b50f86980b777448f40b9efb10b188e62b4faf181
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Image: busybox
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Image ID: docker-pullable://busybox@sha256:c3839dd800b9eb7603340509769c43e146a74c63dca3045a8e7dc8ee07e53966
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Port: <none>
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Host Port: <none>
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Command:
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sleep
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Args:
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5
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State: Terminated
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Reason: Completed
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Exit Code: 0
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Started: Sun, 31 Mar 2024 22:15:35 +0300
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Finished: Sun, 31 Mar 2024 22:15:40 +0300
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Ready: False
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Restart Count: 0
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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-52w28 (ro)
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Conditions:
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Type Status
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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-52w28:
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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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ConfigMapOptional: <nil>
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DownwardAPI: true
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QoS Class: BestEffort
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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 106s default-scheduler Successfully assigned default/pre-install-hook to minikube
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Normal Pulling 103s kubelet Pulling image "busybox"
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Normal Pulled 101s kubelet Successfully pulled image "busybox" in 2.166s (2.167s including waiting)
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Normal Created 100s kubelet Created container sleep-5
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Normal Started 100s kubelet Started container sleep-5
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$ kubectl describe po post-install-hook
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Name: post-install-hook
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Namespace: default
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Priority: 0
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Service Account: default
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Node: minikube/192.168.49.2
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Start Time: Sun, 31 Mar 2024 22:15:43 +0300
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Labels: <none>
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Annotations: helm.sh/hook: post-install
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Status: Succeeded
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IP: 10.244.0.29
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IPs:
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IP: 10.244.0.29
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Containers:
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sleep-10:
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Container ID: docker://90f8d485d239cb251abb96bed98bb057023e0026bd0f44a519f4020c04e10b8e
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Image: busybox
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Image ID: docker-pullable://busybox@sha256:c3839dd800b9eb7603340509769c43e146a74c63dca3045a8e7dc8ee07e53966
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Port: <none>
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Host Port: <none>
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Command:
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sleep
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Args:
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10
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State: Terminated
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Reason: Completed
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Exit Code: 0
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Started: Sun, 31 Mar 2024 22:15:49 +0300
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Finished: Sun, 31 Mar 2024 22:15:59 +0300
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Ready: False
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Restart Count: 0
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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-nlrcb (ro)
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Conditions:
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Type Status
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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-nlrcb:
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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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ConfigMapOptional: <nil>
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DownwardAPI: true
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QoS Class: BestEffort
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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 99s default-scheduler Successfully assigned default/post-install-hook to minikube
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Normal Pulling 97s kubelet Pulling image "busybox"
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Normal Pulled 95s kubelet Successfully pulled image "busybox" in 2.015s (2.015s including waiting)
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Normal Created 95s kubelet Created container sleep-10
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Normal Started 94s kubelet Started container sleep-10
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$ kubectl get pods,svc
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NAME READY STATUS RESTARTS AGE
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pod/app-py-774b8c9bc-hv6tg 1/1 Running 0 67s
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pod/app-py-774b8c9bc-p2v9s 1/1 Running 0 67s
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pod/app-py-774b8c9bc-r22dh 1/1 Running 0 67s
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pod/app-py-774b8c9bc-svlbm 1/1 Running 0 67s
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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service/app-py LoadBalancer 10.111.233.19 <pending> 5000:31628/TCP 67s
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service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 113m
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$
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```

‎k8s/app-go/.helmignore

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# Patterns to ignore when building packages.
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# This supports shell glob matching, relative path matching, and
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# negation (prefixed with !). Only one pattern per line.
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.DS_Store
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# Common VCS dirs
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.git/
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.gitignore
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.bzr/
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.bzrignore
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.hg/
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.hgignore
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.svn/
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# Common backup files
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*.swp
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*.bak
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*.tmp
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*.orig
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*~
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# Various IDEs
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.project
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.idea/
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*.tmproj
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.vscode/

‎k8s/app-go/Chart.lock

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dependencies:
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- name: label-lib
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repository: file://../label-lib
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version: 0.1.0
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digest: sha256:d33e74eddc07f8914537b87b237d90f30af5d0015d167f8d673ebe25f86c923f
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generated: "2024-03-31T22:48:15.070549349+03:00"

‎k8s/app-go/Chart.yaml

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apiVersion: v2
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name: app-py
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description: A Helm chart for Kubernetes
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# A chart can be either an 'application' or a 'library' chart.
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#
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# Application charts are a collection of templates that can be packaged into versioned archives
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# to be deployed.
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#
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# Library charts provide useful utilities or functions for the chart developer. They're included as
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# a dependency of application charts to inject those utilities and functions into the rendering
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# pipeline. Library charts do not define any templates and therefore cannot be deployed.
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type: application
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# This is the chart version. This version number should be incremented each time you make changes
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# to the chart and its templates, including the app version.
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# Versions are expected to follow Semantic Versioning (https://semver.org/)
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version: 0.1.0
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dependencies:
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- name: label-lib
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version: 0.1.0
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repository: file://../label-lib

‎k8s/app-go/templates/NOTES.txt

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1. Get the application URL by running these commands:
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{{- if .Values.ingress.enabled }}
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{{- range $host := .Values.ingress.hosts }}
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{{- range .paths }}
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http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
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{{- end }}
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{{- end }}
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{{- else if contains "NodePort" .Values.service.type }}
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export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "app-py.fullname" . }})
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export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
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echo http://$NODE_IP:$NODE_PORT
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{{- else if contains "LoadBalancer" .Values.service.type }}
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NOTE: It may take a few minutes for the LoadBalancer IP to be available.
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You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "app-py.fullname" . }}'
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export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "app-py.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
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echo http://$SERVICE_IP:{{ .Values.service.port }}
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{{- else if contains "ClusterIP" .Values.service.type }}
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export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "app-py.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
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export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
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echo "Visit http://127.0.0.1:8080 to use your application"
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kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
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{{- end }}

‎k8s/app-go/templates/_helpers.tpl

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{{/*
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Expand the name of the chart.
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*/}}
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{{- define "app-py.name" -}}
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{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
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{{- end }}
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{{/*
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Create a default fully qualified app name.
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We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
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If release name contains chart name it will be used as a full name.
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*/}}
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{{- define "app-py.fullname" -}}
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{{- if .Values.fullnameOverride }}
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{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
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{{- else }}
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{{- $name := default .Chart.Name .Values.nameOverride }}
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{{- if contains $name .Release.Name }}
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{{- .Release.Name | trunc 63 | trimSuffix "-" }}
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{{- else }}
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{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
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{{- end }}
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{{- end }}
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{{- end }}
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{{/*
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Create chart name and version as used by the chart label.
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*/}}
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{{- define "app-py.chart" -}}
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{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
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{{- end }}
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{{/*
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Common labels
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*/}}
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{{- define "app-py.labels" -}}
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helm.sh/chart: {{ include "app-py.chart" . }}
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{{ include "app-py.selectorLabels" . }}
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{{- if .Chart.AppVersion }}
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app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
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{{- end }}
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app.kubernetes.io/managed-by: {{ .Release.Service }}
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{{- end }}
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{{/*
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Selector labels
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*/}}
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{{- define "app-py.selectorLabels" -}}
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app.kubernetes.io/name: {{ include "app-py.name" . }}
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app.kubernetes.io/instance: {{ .Release.Name }}
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{{- end }}
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{{/*
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Create the name of the service account to use
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*/}}
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{{- define "app-py.serviceAccountName" -}}
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{{- if .Values.serviceAccount.create }}
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{{- default (include "app-py.fullname" .) .Values.serviceAccount.name }}
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{{- else }}
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{{- default "default" .Values.serviceAccount.name }}
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{{- end }}
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{{- end }}

‎k8s/app-go/templates/deployment.yaml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: {{ include "app-py.fullname" . }}
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labels:
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{{- include "app-py.labels" . | nindent 4 }}
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spec:
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{{- if not .Values.autoscaling.enabled }}
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replicas: {{ .Values.replicaCount }}
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{{- end }}
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selector:
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matchLabels:
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{{- include "app-py.selectorLabels" . | nindent 6 }}
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template:
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metadata:
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{{- with .Values.podAnnotations }}
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annotations:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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labels:
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{{- include "app-py.labels" . | nindent 8 }}
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{{- with .Values.podLabels }}
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{{- toYaml . | nindent 8 }}
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{{- end }}
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spec:
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{{- with .Values.imagePullSecrets }}
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imagePullSecrets:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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serviceAccountName: {{ include "app-py.serviceAccountName" . }}
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securityContext:
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{{- toYaml .Values.podSecurityContext | nindent 8 }}
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containers:
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- name: {{ .Chart.Name }}
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securityContext:
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{{- toYaml .Values.securityContext | nindent 12 }}
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image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
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imagePullPolicy: {{ .Values.image.pullPolicy }}
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ports:
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- name: http
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containerPort: {{ .Values.service.port }}
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protocol: TCP
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livenessProbe:
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{{- toYaml .Values.livenessProbe | nindent 12 }}
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readinessProbe:
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{{- toYaml .Values.readinessProbe | nindent 12 }}
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resources:
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{{- toYaml .Values.resources | nindent 12 }}
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{{- with .Values.volumeMounts }}
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volumeMounts:
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{{- toYaml . | nindent 12 }}
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{{- end }}
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{{- with .Values.volumes }}
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volumes:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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{{- with .Values.nodeSelector }}
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nodeSelector:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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{{- with .Values.affinity }}
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affinity:
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{{- toYaml . | nindent 8 }}
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{{- end }}
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{{- with .Values.tolerations }}
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tolerations:
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{{- toYaml . | nindent 8 }}
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{{- end }}

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