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Working with Namesspace
=======================================
Namespace DONE
POD
ReplicationController
Deployment
=====================================
What is Namespace?
Secret Formula
------------------------------------
C
CMD
create
YAML
create -f yaml
R
CMD
get
describe
YAML
get -f yaml
U
CMD
edit
YAML
apply -f yaml
D
CMD
delete
YAML
delete -f yaml
root@ip-172-31-46-170:/home/ubuntu# kubectl get ns
NAME STATUS AGE
default Active 19h
kube-node-lease Active 19h
kube-public Active 19h
kube-system Active 19h
root@ip-172-31-46-170:/home/ubuntu#
79 clear
80 ls
81 kubectl get ns
82 kubectl create ns raj
83 kubectl get ns
84 kubectl describe ns raj
85 kubectl edit ns raj
86 kubectl describe ns raj
87 kubectl delete ns raj
88 history
Code language: JavaScript (javascript)Namespace LAB
Working with Kubernetes PODS
112 ls
113 vi pod.yaml
114 kubectl create -f pod.yaml
115 kubectl get pods
116 kubectl create ns rajesh
117 kubectl create -f pod.yaml
118 kubectl create -f pod.yaml -n=rajesh
119 kubectl get pods
120 kubectl get pods -n=rajesh
121 kubectl describe pod rajesh
122 clear
123 vi pod.yaml
124 kubectl apply -f pod.yaml
125 kubectl describe pod rajesh
126 clear
127 ls
128 kubectl apply -f pod.yaml -n=rajesh
129 kubectl delete -f pod.yaml
130 kubectl delete -f pod.yaml -=rajesh
131 kubectl delete -f pod.yaml -nrajesh
132 kubectl apply -f pod.yaml
133 kubectl get pods
134 kubectl get pods --show-labels
135 kubectl get pods -o wide
136 curl http://192.168.1.4
Code language: JavaScript (javascript)How to troubleshoot PODS?
142 kubectl get pods
143 kubectl get pods -o wide
144 kubectl logs rajesh
145 curl http://192.168.1.4
146 kubectl logs rajesh
147 curl http://192.168.1.4
148 kubectl logs rajesh
149 curl http://192.168.1.4
150 kubectl logs rajesh
151 clear
152 ls
153 kubectl attach rajesh
154 clear
155 ls
156 clear
157 kubectl exec rajesh ls
158 clear
159 ;ls
160 kubectl exec -it rajesh /bin/bash
161 clear
162 kubectl port-forward -h
163 clear
164 kubectl port-forward --address 0.0.0.0 pod/rajesh 8888:80
165 clear
166 ls
167 kubectl cp pod.yaml rajesh:/tmp
168 kubectl exec rajesh ls /tmp
169 kubectl auth
170 kubectl auth can-i
171 clear
172 kubectl auth can-i
173 kubectl auth can-i create pod
174 kubectl auth can-i create ns
175 history
Code language: PHP (php)Working with Kubernetes ReplicationController
ReplicationController
KIND: Pod
Replication --> 1 TO MANY
Controller --> DESIRE === Actual
===================================
https://www.devopsschool.com/blog/kubernetes-replicationcontroller-example-programs/
<blockquote class="wp-embedded-content" data-secret="jp41BbL78a"><a href="https://www.devopsschool.com/blog/difference-between-replicaset-and-replicationcontroller/">Difference between ReplicaSet and ReplicationController?</a></blockquote><iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted" style="position: absolute; visibility: hidden;" title="“Difference between ReplicaSet and ReplicationController?” — DevOpsSchool.com" src="https://www.devopsschool.com/blog/difference-between-replicaset-and-replicationcontroller/embed/#?secret=3jYR6z8K6J#?secret=jp41BbL78a" data-secret="jp41BbL78a" width="600" height="338" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
apiVersion: v1
kind: ReplicationController
metadata:
name: rajeshrc
spec:
replicas: 5
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: scmgalaxy/nginx-devopsschoolv1
kubectl scale --replicas=1 rc/rajeshrc
apiVersion: v1
kind: ReplicationController
metadata:
creationTimestamp: "2023-10-17T08:52:12Z"
generation: 4
labels:
app: nginx
name: rajeshrc
namespace: default
resourceVersion: "58311"
uid: 45119ee9-e4e5-48b9-96fd-346e7deb01ec
spec:
replicas: 20
selector:
app: nginx
template:
metadata:
creationTimestamp: null
labels:
app: nginx
spec:
containers:
- image: scmgalaxy/nginx-devopsschoolv1
imagePullPolicy: Always
name: nginx
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 3
192 clear
193 kubectl get ns
194 kubectl get pods --all--namespaces
195 kubectl get pods --all-namespaces
196 clear
197 ls
198 kubectl get rc
199 kubectl create -f rc.yaml
200 kubectl get rc
201 kubectl get pods
202 kubectl get rc
203 clear
204 kubectl get rc
205 kubectl describe rc rajeshrc
206 clear
207 l
208 kubectl get pods
209 kubectl describe pod pl321
210 kubectl get pods
211 kubectl describe pod rajeshrc-4s4dj
212 clear
213 l
214 kubectl get rc
215 kubectl edit rc rajeshrc
216 kubectl get rc
217 kubectl get pods
218 kubectl
219 clear
220 kubectl scale -h
221 clear
222 kubectl scale --replicas=1 rc/rajeshrc
223 kubectl get pods
224 kubectl scale --replicas=20 rc/rajeshrc
225 kubectl get pods
226 clear
227 ls
228 kubectl get rc
229 kubectl get rc rajeshrc -o yaml
230 clear
231 lsclear
232 clear
233 ls
234 kubectl scale --replicas=3 rc/rajeshrc
235 clear
236 celar
237 clear
238 kubectl get pods
239 kubectl delete pod nodehelloworld.example.com
240 kubectl get pods
241 clear
242 kubectl get pods
243 kubectl delete pod rajeshrc-2zl4w rajeshrc-rg5kf
244 kubectl get pods
245 kubectl delete rc rajeshrc
246 kubectl get pods
https://stackoverflow.com/questions/43147941/allow-scheduling-of-pods-on-kubernetes-master
Code language: JavaScript (javascript)Working with Kubernetes Deployment
266 kubectl delete all pods
267 kubectl delete pods --all
268 clear
269 kubectl create deployment my-dep --image=scmgalaxy/nginx-devopsschoolv1 --replicas=5
270* kubectl
271 clear
272 kubectl describe deploy my-dep
273 clear
274 kubectl edit deploy my-dep
275 history | grep scale
276 kubectl scale --replicas=20 deploy/my-dep
277 kubectl get deploy
278 kubectl get pods
279 clear
280 kubectl scale --replicas=2 deploy/my-dep
281 kubectl get pods
282 clear
283 kubectl get pods
284 clear
285 kubectl get pods
286 kubectl delete pod my-dep-7d597cfb66-868vs my-dep-7d597cfb66-zztmx
287 kubectl get pods
288 clear
289 ls
290 history
291 clear
292 kubectl
293 clear
294 kubectl rollout -h
295 kubectl rollout history dep/my-dep
296 kubectl rollout history deploy/my-dep
297 kubectl get pods -o wide
298 curl http://192.168.1.213
299 clear
300 kubectl scale --replicas=30 deploy/my-dep
301 kubectl rollout status deploy/my-dep
302 kubectl rollout restart deploy/my-dep
303 kubectl rollout status deploy/my-dep
304 kubectl rollout history deploy/my-dep
305 kubectl get pods -o wide
306 curl http://192.168.1.243
307 clear
308 kubectl
309 clear
310 kubectl get pods
311 clear
312 kubectl get deploy
313 kubectl describe deploy my-dep
314 clear
315 kubectl patch deployment my-dep --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/0/image", "value":"scmgalaxy/nginx-devopsschoolv2"}]'
316 kubectl rollout status deploy/my-dep
317 kubectl rollout history deploy/my-dep
318 kubectl get pods -o wide
319 curl http://192.168.1.254
320 clear
321 kubectl rollout -h
322 clear
323 kubectl rollout undo -h
324 clear
325 kubectl rollout undo deploy/my-dep --to-revision=2
326 kubectl rollout status deploy/my-dep
327 kubectl get pods -o wide
328 curl http://192.168.1.26
Code language: PHP (php)