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Bharath KaimalBharath Kaimal
Bharath Kaimal
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Bharath Kaimal
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update to kubernetes-pods-health
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‎docs/openshift/pods/health-checks/index.md‎

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A Probe is a diagnostic performed periodically by the kubelet on a Container. To perform a diagnostic, the kubelet calls a Handler implemented by the Container. There are three types of handlers:
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***ExecAction***: Executes a specified command inside the Container. The diagnostic is considered successful if the command exits with a status code of 0.
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**_ExecAction_**: Executes a specified command inside the Container. The diagnostic is considered successful if the command exits with a status code of 0.
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***TCPSocketAction***: Performs a TCP check against the Container’s IP address on a specified port. The diagnostic is considered successful if the port is open.
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**_TCPSocketAction_**: Performs a TCP check against the Container’s IP address on a specified port. The diagnostic is considered successful if the port is open.
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***HTTPGetAction***: Performs an HTTP Get request against the Container’s IP address on a specified port and path. The diagnostic is considered successful if the response has a status code greater than or equal to 200 and less than 400.
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**_HTTPGetAction_**: Performs an HTTP Get request against the Container’s IP address on a specified port and path. The diagnostic is considered successful if the response has a status code greater than or equal to 200 and less than 400.
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The kubelet can optionally perform and react to three kinds of probes on running Containers:
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***livenessProbe***: Indicates whether the Container is running. Runs for the lifetime of the Container.
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**_livenessProbe_**: Indicates whether the Container is running. Runs for the lifetime of the Container.
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***readinessProbe***: Indicates whether the Container is ready to service requests. Only runs at start.
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**_readinessProbe_**: Indicates whether the Container is ready to service requests. Only runs at start.
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### Resources
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name: my-pod
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spec:
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containers:
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- name: app
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image: busybox
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command: ['sh', '-c', "echo Hello, Kubernetes! && sleep 3600"]
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livenessProbe:
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exec:
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command: ['echo','alive']
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- name: app
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image: busybox
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command: ["sh", "-c", "echo Hello, Kubernetes! && sleep 3600"]
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livenessProbe:
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exec:
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command: ["echo", "alive"]
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```
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```yaml
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spec:
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shareProcessNamespace: true
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containers:
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- name: app
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image: bitnami/nginx
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ports:
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- containerPort: 8080
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livenessProbe:
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tcpSocket:
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port: 8080
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initialDelaySeconds: 10
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readinessProbe:
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httpGet:
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path: /
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port: 8080
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periodSeconds: 10
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- name: app
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image: bitnami/nginx
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ports:
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- containerPort: 8080
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livenessProbe:
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tcpSocket:
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port: 8080
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initialDelaySeconds: 10
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readinessProbe:
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httpGet:
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path: /
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port: 8080
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periodSeconds: 10
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```
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## Container Logging
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### Resources
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**OpenShift**
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=== "OpenShift"
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- [Logs Command](https://docs.openshift.com/container-platform/4.13/cli_reference/openshift_cli/developer-cli-commands.html){:target="_blank"}
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- [Cluster Logging](https://docs.openshift.com/container-platform/4.13/logging/cluster-logging.html){:target="_blank"}
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- [Logging Collector](https://docs.openshift.com/container-platform/4.13/logging/config/cluster-logging-collector.html){:target="_blank"}
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[Logs Command :fontawesome-solid-globe:](https://docs.openshift.com/container-platform/4.13/cli_reference/openshift_cli/developer-cli-commands.html){:target="_blank"}
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**IKS**
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[Cluster Logging :fontawesome-solid-globe:](https://docs.openshift.com/container-platform/4.13/logging/cluster-logging.html){:target="_blank"}
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- [Logging](https://kubernetes.io/docs/concepts/cluster-administration/logging/){:target="_blank"}
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[Logging Collector :fontawesome-solid-globe:](https://docs.openshift.com/container-platform/4.13/logging/config/cluster-logging-collector.html){:target="_blank"}
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### References
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=== "IBM Cloud Kubernetes Service"
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[Logging](https://kubernetes.io/docs/concepts/cluster-administration/logging/){:target="_blank"}
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### References
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```yaml title="Pod Example"
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apiVersion: v1
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name: counter
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spec:
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containers:
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- name: count
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image: busybox
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command: ['sh','-c','i=0; while true; do echo "$i: $(date)"; i=$((i+1)); sleep 5; done']
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- name: count
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image: busybox
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command:
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[
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"sh",
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"-c",
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'i=0; while true; do echo "$i: $(date)"; i=$((i+1)); sleep 5; done',
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]
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```
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=== "OpenShift"
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### Resources
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**OpenShift**
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=== "OpenShift"
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[Monitoring Application Health :fontawesome-solid-globe:](https://docs.openshift.com/container-platform/4.13/applications/application-health.html){:target="_blank"}
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- [Monitoring Application Health](https://docs.openshift.com/container-platform/4.13/applications/application-health.html){:target="_blank"}
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=== "IBM Cloud Kubernetes Service"
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**IKS**
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[Monitoring Resource Usage :fontawesome-solid-globe:](https://kubernetes.io/docs/tasks/debug-application-cluster/resource-usage-monitoring/){:target="_blank"}
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- [Monitoring Resource Usage](https://kubernetes.io/docs/tasks/debug-application-cluster/resource-usage-monitoring/){:target="_blank"}
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- [Resource Metrics](https://kubernetes.io/docs/tasks/debug-application-cluster/resource-metrics-pipeline/){:target="_blank"}
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[Resource Metrics :fontawesome-solid-globe:](https://kubernetes.io/docs/tasks/debug-application-cluster/resource-metrics-pipeline/){:target="_blank"}
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### References
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name: 500m
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spec:
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containers:
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- name: app
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image: gcr.io/kubernetes-e2e-test-images/resource-consumer:1.4
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resources:
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requests:
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cpu: 700m
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memory: 128Mi
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- name: busybox-sidecar
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image: radial/busyboxplus:curl
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command: [/bin/sh, -c, 'until curl localhost:8080/ConsumeCPU -d "millicores=500&durationSec=3600"; do sleep 5; done && sleep 3700']
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- name: app
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image: gcr.io/kubernetes-e2e-test-images/resource-consumer:1.4
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resources:
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requests:
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cpu: 700m
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memory: 128Mi
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- name: busybox-sidecar
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image: radial/busyboxplus:curl
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command:
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[
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/bin/sh,
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-c,
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'until curl localhost:8080/ConsumeCPU -d "millicores=500&durationSec=3600"; do sleep 5; done && sleep 3700',
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]
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```
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```yaml
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name: 200m
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spec:
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containers:
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- name: app
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image: gcr.io/kubernetes-e2e-test-images/resource-consumer:1.4
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resources:
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requests:
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cpu: 300m
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memory: 64Mi
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- name: busybox-sidecar
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image: radial/busyboxplus:curl
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command: [/bin/sh, -c, 'until curl localhost:8080/ConsumeCPU -d "millicores=200&durationSec=3600"; do sleep 5; done && sleep 3700']
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- name: app
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image: gcr.io/kubernetes-e2e-test-images/resource-consumer:1.4
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resources:
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requests:
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cpu: 300m
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memory: 64Mi
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- name: busybox-sidecar
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image: radial/busyboxplus:curl
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command:
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[
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/bin/sh,
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-c,
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'until curl localhost:8080/ConsumeCPU -d "millicores=200&durationSec=3600"; do sleep 5; done && sleep 3700',
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]
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```
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=== "OpenShift"
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```
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oc get projects
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oc api-resources -o wide
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oc api-resources -o name
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```
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oc get projects
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oc api-resources -o wide
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oc api-resources -o name
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oc get nodes,ns,po,deploy,svc
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## Activities
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| Task | Description | Link |
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| --------------------------------| ------------------ |:----------- |
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| ***Try It Yourself*** | | |
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| Probes | Create some Health & Startup Probes to find what's causing an issue. | [Probes](../../../labs/kubernetes/lab4/index.md) |
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| Task | Description | Link |
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| --------------------- | -------------------------------------------------------------------- | :----------------------------------------------- |
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| **_Try It Yourself_** | | |
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| Probes | Create some Health & Startup Probes to find what's causing an issue. | [Probes](../../../labs/kubernetes/lab4/index.md) |

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