https://www.devopsschool.com/blog/?s=kubernetes

Kubernetes
=================================
What is Kubernetes?
-----------------------------------
Orch tool for Container
Dev in Go
FREE and OS
mgmt by cncf
1.27
===================================
Why Kubernetes?
-----------------------------------
-> Computing
-> storage
- net
- lb
- dns
- db
- monitoing
- cert
====================================
Container
=================
Why we use AWS? - Write in 5 Pages
-> Computing
-> storage
- net
- lb
- dns
- db
- monitoing
- cert
==================================
VMS
===========================================================
How it works?
===========================================================
YOU --------> COntrol Plane	------> Worker Node(S)
------------------
Master node		VMS
Workstation================================================
k8 Cluster
How to setup COntrol Plane?
Executable
-------------------------
Kubelet 	- Agent running in each node
kubeadm		- K8 Admin tool
kubectl		- k8 client
Docker		- container
CNI		- networking
apps
-------------------------
API server ======> 100s of api == 100s of feature
Controller mgr === Monitor k8 cluster and updte api
Schedualr = Schedule work to Worker
eTCD - PS
Proxy - Networking
CoreDNS - DSN and DIscovery
API --> URL -----> APP 	C	-> PUT
R	- GET
U 	- POST
D	- DELETE
How to Setup Worker Node>
Executable
-------------------------
Kubelet 
kubeadm
kubectl
Docker
CNI
apps
-------------------------
Proxy
How to Setup Workstation?
------------------------
kubectl
======================================================================================
What is POD?
============================================
AWS
VMS	EBS|eFS|S3	RDS|DB	LB	ASG		DNS
K8
POD	volume		Service	Service	Deployment	DNS
Compute Unit
---Contains COntainers
s===============================
Workstation + Master		Worker
===================	======================
1 			2
===========================================================
PS -----> VMS--> AWS ----> Container -----> Kuber
How to request APIserver for API resources
Namespace
POD
Deployment
Services
FORUMLA
C
YAML
create -f yaml
CMD
create
R
YAML
get -f yaml
CMD
get
U
YAML
apply -f yaml
CMD
edit
D
YAML
delete -f yaml
CMD
delete
Troubleshooting and Debugging Commands:
describe      Show details of a specific resource or group of resources
logs          Print the logs for a container in a pod
attach        Attach to a running container
exec          Execute a command in a container
port-forward  Forward one or more local ports to a pod
cp            Copy files and directories to and from containers
docker logs
docker attach
docker exec
docker -p
docker cp
proxy         Run a proxy to the Kubernetes API server
auth          Inspect authorization
debug         Create debugging sessions for troubleshooting workloads and nodes
kubectl port-forward --address 0.0.0.0 pod/rajesh 8888:80
apiVersion: v1
kind: Pod
metadata:
name: rajesh
labels:
app: helloworld
spec:
containers:
- name: devopsschool1
image: scmgalaxy/nginx-devopsschoolv1
ports:
- name: nginx-port
containerPort: 80
1  clear
2  cd
3  git clone https://github.com/certifications-tutorials/cks-course-environment/
4  cd cks-course-environment/
5  clear
6  ls
7  cd cluster-setup/
8  ls
9  cd latest/
10  ls
11  chmod 755 install_master.sh
12  ./install_master.sh
13  clear
14  cd
15  clear
16  ls
17  kubectl get nodes
18  kubectl get pods --all-namespaces
19  ckear
20  clear
21  kubectl
22  clear
23  kubectl get nodes
24  kubectl
25  kubectl api-resources
26  clear
27  kubectl get ns
28  kubectl get pods -n=kube-system
29  kubectl
30  clear
31  kubectl get ns
32  kubectl create ns dev
33  kubectl get ns
34  kubectl edit ns dev
35  kubectl get ns
36  kubectl get ns --show-lables
37  kubectl get ns --show-labels
38  clea
39  clear
40  history
41  kubectl delete ns dev
42  kubectl get ns
43  clear
44  kubectl api-resources
45  clear
46  kubectl api-resources | grep ns
47  clear
48  ls
49  cd
50  vi pod.yaml
51  kubectl get pods
52  kubectl get pods -n=dev
53  kubectl create -f pod.yaml
54  kubectl get pods -n=dev
55  kubectl get pods
56  kubectl get ns
57  kubectl create ns dev
58  clear
59  kubectl get ns
60  kubectl create -f pod.yaml
61  kubectl create -f pod.yaml -n=dev
62  clear
63  kubectl get pods
64  kubectl get pods -n=dev
65  vi pod.yaml
66  kubectl get pods --show-labels
67  kubectl apply -f pod.yaml
68  kubectl get pods --show-labels
69  history
70  clear
71  kubectl api-resources
72  clear
73  kubectl api-resources
74  clear
75  kubectl get pods
76  kubectl edit pod rajesh
77  kubectl delete -f pod.yaml
78  kubectl get pods
79  kubectl create -f pod.yaml
80  kubectl get pods
81  kubectl get pods -o wide
82  kubectl describe pod rajesh
83  clear
84  ls
85  clear
86  lsw
87  cler
88  clear
89  kubectl
90  clear
91  kubectl get pods
92  kubectl describe pod rajesh
93  clear
94  kubectl logs rajesh
95  kubectl get pods -o wide
96  curl http://192.168.1.4
97  kubectl logs rajesh
98  curl http://192.168.1.4
99  kubectl logs rajesh
100  kubectl attach rajesh
101  cler
102  clear
103  kubectl exec rajesh ls
104  kubectl exec -it rajesh /bin/bash
105  cler
106  clear
107  kubectl port-forward -h
108  clear
109  kubectl port-forward --address 0.0.0.0 pod/rajesh 8888:80
110  clear
111  ls
112  kubectl cp pod.yaml rajesh:/tmp
113  kubectl exec rajesh ls /tmp
114  history
=================================================================
PS 		VM 		Cont		POD
====================================================================
PID1		PID1		PID1		Container ---RESTART
========================================================================
Deployment
Service
==============================================================
Deployment
=================================================
Replication
Controller
Versioning
v1 
v2
Rollout
Rollback
kubectl create deployment my-dep --image=scmgalaxy/nginx-devopsschoolv1 --replicas=10
kubectl scale --replicas=3 deployment/my-dep 
kubectl rollout undo deploy/my-dep --to-revision=1
113  kubectl exec rajesh ls /tmp
114  history
115  clear
116  kubectl get pods
117  vi pod.yaml
118  kubect apply -f pod.yaml
119  kubectl apply -f pod.yaml
120  kubectl get pods
121  kubectl describe pod rajesh
122  kubectl get pods
123  clear
124  history
125  kubectl
126  kubectl uncordon -h
127  clear
128  kubectl
129  clear
130  kubectl get pods
131  cleaer
132  clear
133  ls
134  kubectl
135  clear
136  kubectl create -h
137  clear
138  kubectl create deploy -h
139  clear
140  kubectl get depoy
141  kubectl get deploy
142  kubectl create deployment my-dep --image=scmgalaxy/nginx-devopsschoolv1 --replicas=10
143  kubectl get deploy
144  kubectl get pods
145  clear
146  ls
147  kubectl get pods
148  kubectl edit deploy my-dep
149  kubectl get pods
150  kubectl get pods -o wide
151  kubectl describe pod my-dep-7d597cfb66-27bck
152  clear
153  ls
154  kubectl get pods -o wide
155  kubectl scale
156  kubectl scale -h
157  clear
158  kubectl scale --replicas=3 deployment/my-dep
159  kubectl get pods -o wide
160  clear
161  kubectl get pods -o wide
162  ls
163  clear
164  kubectl get pods -o wide
165  kubectl delete pod my-dep-7d597cfb66-6tcpn my-dep-7d597cfb66-fp8h9 my-dep-7d597cfb66-rw9lw
166  kubectl get pods -o wide
167  kubectl rollout -h
168  kubectl rollout history deploy/my-dep
169  clear
170  kubectl get pods -o wide
171  curl http://192.168.1.27
172  kubectl scale --replicas=30 deployment/my-dep
173  cler
174  clear
175  kubectl get pods -o wide
176  clear
177  kubectl get pods -o wide
178  clear
179  kubectl get pods -o wide
180  clear
181  kubectl rollout history deploy/my-dep
182  kubectl rollout status deploy/my-dep
183  kubectl edit deploy/my-dep
184  kubectl rollout history deploy/my-dep
185  kubectl rollout status deploy/my-dep
186  clear
187  kubectl rollout history deploy/my-dep
188  kubectl get pods -o wide
189  curl http://192.168.1.70
190  clear
191  kubectl rollout -h
192  kubectl rollout undo -h
193  clear
194  kubectl rollout history deploy/my-dep
195  kubectl rollout undo deploy/my-dep --to-revision=1
196  kubectl get pods -o wide
197  clear
198  kubectl get pods -o wide
199  kubectl get pods -o wide \
200  kubectl get pods -o wide
201  curl http://192.168.1.94
202  history
=============================================
versioning
OPT1	k8
deploy	1.1	git     1
1.2		2
1.3		3
Service
==========================================================
=== LB
==== NETWROK LB
--------------------------------------------------
BALANCE POD
kubectl expose deployment my-dep --port=8000 --target-port=80
CLustor --> NodePort
kubectl patch service rj -p '{"spec": {"type": "NodePort"}}'
======================================================================
COMPUTER - pod - deploy
Discovery - service
Storage --- pv - pvc - sc
A n A ---> role crle rolebing sa, '
-- secret, configmap
------------
job
cronjobs
203  clear
204  kubectl get pods -o wide
205  clear
206  kubectl get svc
207  kubectl expose -h
208  clear
209  kubectl expose deployment my-dep --port=80 --target-port=8000
210  kubectl get svc
211  kubectl describe svc my-dep
212  curl http://10.104.95.0
213  curl http://10.104.95.0:8000
214  clear
215  kubectl expose deployment my-dep --port=8000 --target-port=80
216  kubectl expose deployment my-dep --port=8000 --target-port=80 --name rj
217  kubectl get svc
218  curl http://10.102.201.238:8000
219  kubectl patch service rj -p '{"spec": {"type": "NodePort"}}'
220  kubectl get svc
221  curl http://10.102.201.238:8000
222  clear
223  kubectl api-resources
224  history
Opt 1 ----> minikube	
https://www.devopsschool.com/blog/?s=minikube
Opt 2 - 2 VM in laptop --- Ubuntu20
<blockquote class="wp-embedded-content" data-secret="RAeiUL9fQi"><a href="https://www.devopsschool.com/blog/kubernetes-1-23-6-cluster-setup-master-and-worker-in-ubuntu-20-04/">Kubernetes 1.23.6 Cluster Setup Master and Worker in Ubuntu 20.04</a></blockquote><iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted" style="position: absolute; visibility: hidden;" title="“Kubernetes 1.23.6 Cluster Setup Master and Worker in Ubuntu 20.04” — DevOpsSchool.com" src="https://www.devopsschool.com/blog/kubernetes-1-23-6-cluster-setup-master-and-worker-in-ubuntu-20-04/embed/#?secret=3UZ0ipLWmm#?secret=RAeiUL9fQi" data-secret="RAeiUL9fQi" width="600" height="338" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
Opt 3 - EKS --- on aws
CUSTER == Multiple Node
each node
many pods
=================================================
k8
=================================================
40+ 
============================================================
AWS 
VM -> EBS|EFS|RDS
K8		
POD --> PV|PVC
<blockquote class="wp-embedded-content" data-secret="9Djv0VYMca"><a href="https://www.devopsschool.com/blog/persistentvolume-persistentvolumeclaim-volumes-using-hostpath/">Kubernetes PersistentVolume, PersistentVolumeClaim, volume using hostPath</a></blockquote><iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted" style="position: absolute; visibility: hidden;" title="“Kubernetes PersistentVolume, PersistentVolumeClaim, volume using hostPath” — DevOpsSchool.com" src="https://www.devopsschool.com/blog/persistentvolume-persistentvolumeclaim-volumes-using-hostpath/embed/#?secret=bikjHK5uGk#?secret=9Djv0VYMca" data-secret="9Djv0VYMca" width="600" height="338" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
Statefulness
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