k8
Kubernetes: Container orchestration. Uses the primary/replica model.
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- API server: serves the kubernetes API
- scheduler
• Nodes: a machine where containers/workloads are deployed
- contains kubelet, nameserver, etc
• Pod: multiple pods in a node.
- ReplicaSet: a replica of the current applications
- StatefulSets: controller that enforce uniqueness etc among pods
• falco: xmlisse.wordpress.com/2023/04/27/falco/
- note with falco, we need to install the falco kernel module on all our things. reference this: falco.org/docs/getting-started/falco-kubernetes-quickstart/
Links
• WikipediaCommands
•kubectl get nodes -> list all cluster nodes
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kubectl describe nodes -> gives detailed node info
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kubectl get namespaces -> describes all namespaces in the cluster
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kubectl get pods --all-namespaces -> get pods in namespaces
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kubectl get pods -n [namespace] -> get shit in the given namespace
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kubectl get deployments --all-namespaces -> list all deployments lol
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kubectl get statefulset --all-namespaces -> lists all statefulsets
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kubectl top pods --all-namespaces -> gets the top pods lol. also, can work with nodes too
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kubectl get events --all-namespaces -> gets all events
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kubectl get services -> get all services
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kubectl describe service -> describe a service lol
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kubectl get secrets --all-namespaces -> list all secrets, used for storing sensitive data like passwords and keys etc
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kubektl delete pods -l app=[app] -n [namespace] -> delete pods lol
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kubectl exec -it [pod name] -n [namespace] -- /bin/sh -> exec a shell in the docker container of the pod
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kubectl logs -n [namespace] [pod-name] -> get logs and stuff
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kubectl get secret [secret] -o yaml -> get some secret, output it to yaml. you will have to decode the password and shit.
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kubectl get services -w -> watch the services
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kubectl delete service [service] -> deletes a service
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kubectl delete -f [file] -> delete a configuration file
Concepts
• Control Plane: master node, which manages workload across the whole system- API server: serves the kubernetes API
- scheduler
• Nodes: a machine where containers/workloads are deployed
- contains kubelet, nameserver, etc
• Pod: multiple pods in a node.
- ReplicaSet: a replica of the current applications
- StatefulSets: controller that enforce uniqueness etc among pods
Nextcloud
• medium.com/@laurent.roffe_24715/first-nextcloud-deployment-in-k8s-manual-full-steps-eca2566751e7• falco: xmlisse.wordpress.com/2023/04/27/falco/
- note with falco, we need to install the falco kernel module on all our things. reference this: falco.org/docs/getting-started/falco-kubernetes-quickstart/