Kubernetes 101: Intro to Kubernetes namespaces, workloads, and architecture In this webinar Oleg, CTO at Kublr, will explain the basics of Kubernetes, a powerful and flexible open-source container orchestration system: what it is, how it works, and the main entities Kubernetes users work with. Containers are taking over the IT world, and while building and running them locally is simple, running them in production on a distributed infrastructure is much more involved. Oleg will show how Kubernetes can help orchestrating containers across multiple compute nodes and clouds. We will cover: - distributed container orchestration - architecture of Kubernetes clusters - important Kubernetes objects: namespaces, pods, services - overview controllers: deployment, daemonset, stateful set

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kind create cluster
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apiVersion: v1
kind: Pod
metadata:
name: pod1
spec:
terminationGracePeriodSeconds: 1
containers:
- name: main
image: cr.kublr.com/alpine
command:
- sh
- -c
- "echo Hi ; sleep 3600"

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kubectl get namespaces [ <ns> ... ]
kubectl describe namespaces [ <ns> ... ]

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kubectl get nodes [ <nd> ... ]
kubectl describe nodes [ <nd> ... ]

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kubectl get pods [ <pd> ... ]
kubectl describe pods [ <pd> ... ]

28. Node 1 Node 2
Pod A-1
10.0.0.3
Cnt1
Cnt2
Pod A-2
10.0.0.5
Cnt1
Cnt2
Pod B-1
10.0.0.8
Cnt3
apiVersion: v1
kind: Pod
metadata:
name: pod1
spec:
terminationGracePeriodSeconds: 1
containers:
- name: main
image: cr.kublr.com/alpine
command:
- sh
- -c
- "echo Hi ; sleep 3600"

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30. Pod
Container 1 Container 2
Persistent
Volume
Volume
Volume
Claim
Volume
Mount
Volume
Mount

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kubectl get configmaps [ <cm> ... ]
kubectl describe configmaps [ <cm> ... ]
kubectl get secrets [ <sc> ... ]
kubectl describe secrets [ <sc> ... ]

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kubectl get services [ <svc> ... ]
kubectl describe services [ <svc> ... ]

33. external
port
Cluster
Pod A-1
10.0.0.3
Pod A-2
10.0.0.5
Pod B-1
10.0.0.8
SrvA
10.7.0.1
SrvB
10.7.0.3

34. Node 1 Node 2
Pod A-1
10.0.0.3
Pod A-2
10.0.0.5
Pod B-1
10.0.0.8
SrvA
10.7.0.1
SrvB
10.7.0.3
SrvA
10.7.0.1
SrvB
10.7.0.3
external
port
external
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iptables iptables

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kubectl get deployment [ <depl> ... ]
kubectl get ingress [ <ing> ... ]
apiVersion: apps/v1
kind: Deployment
metadata:
name: dp1
spec:
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
replicas: 3
selector:
matchLabels:
app: dp1
template:
metadata:
labels:
app: dp1
spec:
terminationGracePeriodSeconds: 1
containers:
- name: main
image: cr.kublr.com/alpine
command: [sh, -c, "sleep 36000"]

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