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KEY – https://github.com/devopsschool-training-notes/Master-in-Devops-Engineering-MDE/tree/master/key
User name – ubuntu
Lab details
Day1
Workstation
------------------------
- kubectl
~/.kube/config
contains
context1
api-server
user
cert
context2
api-server
user
cert
Master
-----------------------
- Api Server - POD -> Container - Image -> GoogleReg
- etcd - POD -> Container - Image -> GoogleReg
- controller mgr - POD -> Container - Image -> GoogleReg
- Schedular - POD -> Container - Image -> GoogleReg
Kubelet + ContainerD + Docker + kubectl - kubeadm
kubeadm init
Worker
---------------------
Kube Proxy - POD -> Container - Image -> GoogleReg
Kubelet + ContainerD + Docker + kubectl - kubeadm
kubeadm join
Master - 65.0.133.20
Worker - 65.0.129.230
ubuntu
https://www.devopsschool.com/blog/kubernetes-installation-configuration/
<blockquote class="wp-embedded-content" data-secret="ggO9sVtHVx"><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=dT2HKiew4C#?secret=ggO9sVtHVx" data-secret="ggO9sVtHVx" width="600" height="338" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
Code language: JavaScript (javascript)- <a href="https://www.devopsschool.com/blog/kubernetes-1-23-6-cluster-setup-master-and-worker-in-ubuntu-20-04">https://www.devopsschool.com/blog/kubernetes-1-23-6-cluster-setup-master-and-worker-in-ubuntu-20-04</a>
API
DEV USER
create put - post - delete - get
read
update
delete
create
cmd
create
yaml
create -f yaml
read
cmd
get
yaml
get -f yaml
update
cmd
edit
yaml
apply -f yaml
delete
cmd
delete
yaml
delete -f yaml
apiVersion: v1
kind: Namespace
metadata:
name: devops1
labels:
kubernetes.io/metadata.name: devops1
26 kubectl
27 clear
28 kubectl cluster-info
29 kubectl get nodes
30 kubectl version
31 kubectl get pods --all-namespaces
32 clear
33 kubectl get nodes
34 kubeadm token create --print-join-command --ttl 0
35 kubectl get nodes
36 kubectl get nodes -w
37 kubectl get nodes
38 kubectl describe node ip-172-31-34-35
39 clear
40 kubectl taint nodes --all node-role.kubernetes.io/master-
41 kubectl get nodes
42 kubectl taint nodes ip-172-31-39-190 node-role.kubernetes.io/control-plane=:NoSchedule
43 kubectl taint nodes ip-172-31-39-190 node-role.kubernetes.io/control-plane=:NoSchedule --overwrite
44 kubectl get nodes
45 clear
46 ls
47 kubectl
48 kubectl api-resources
49 clear
50 kubectl get ns
51 kubectl api-resources
52 clear
53 kubectl
54 clear
55 kubectl create rajesh
56 kubectl create ns rajesh
57 kubectl create ns dev
58 kubectl get bs
59 kubectl get ns
60 kubectl describe ns rajesh
61 kubectl edit ns rajesh
62 kubectl describe ns rajesh
63 kubectl delete ns rajesh
64 kubectl get ns
65 history
66 clear
67 ls
68 vi ns.yaml
69 kubectl create -f ns.yaml
70 kubectl get -f ns.yaml
71 kubectl describe -f ns.yaml
72 vi ns.yaml
73 kubectlapply -f ns.yaml
74 kubectl apply -f ns.yaml
75 kubectl describe -f ns.yaml
76 kubectl delete -f ns.yaml
Code language: JavaScript (javascript)POD
apiVersion: v1
kind: Pod
metadata:
name: rajesh
labels:
app: helloworld
spec:
containers:
- name: devopsschool1
image: scmgalaxy/nginx-devopsschoolv1
ports:
- name: nginx-port
containerPort: 80
41 clear
42 vi pod.yaml
43 kubectl create -f pod.yaml
44 kubectl get pods
45 kubectl get ns
46 kubectl create -f pod.yaml
47 kubectl create -f pod.yaml -n=dev
48 kubectl get pods
49 kubectl get pods -n=dev
50 kubectl describe pod rajesh
51 clear
52 ls
53 vi pod.yaml
54 kubectl apply -f pod.yaml
55 kubectl describe pod rajesh
56 clear
57 kubectl delete -f pod.yaml
58 kubectl get pods
59 history
Code language: JavaScript (javascript)Day 2
container
--------------
docker exec -it contd /bin/bash
docker attach
docker logs
docker cp
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
auth Inspect authorization
events List events
kubectl port-forward --address 0.0.0.0 pod/rajesh 8888:80
106 kubectl get pods
107 ls
108 cd
109 ls
110 kubectl apply -f pod.yaml
111 kubectl get pods
112 kubectl logs rajesh
113 kubectl describe pod rajesh
114 clear
115 curl http://192.168.1.4
116 kubectl logs rajesh
117 kubectl logs -h
118 clear
119 ls
120 ps -eaf
121 clear
122 docker attach rajesh
123 kubectl attach rajesh
124 kubectl exec rajesh ls
125 kubectl exec rajesh ps
126 clear
127 kubectl exec rajesh free
128 kubectl exec rajesh ls
129 kubectl exec -it rajesh /bin/bash
130 clear
131 ls
132 kubectl
133 clear
134 kubectl port-forward -h
135 clear
136 kubectl port-forward --address 0.0.0.0 pod/rajesh 8888:80
137 cledar
138 clear
139 kubectl get pods
140 ls
141 kubectl exec rajesh ls /opt
142 kubectl cp pod.yaml rajesh:/opt
143 kubectl exec rajesh ls /opt
144 kubectl auth
145 kubectl auth can-i create pod
146 kubectl auth can-i create service
147 kubectl auth can-i delete pod
148 kubectl events
149 kubectl events -h
Code language: JavaScript (javascript)ReplicationController
apiVersion: v1
kind: ReplicationController
metadata:
name: rajrc
spec:
replicas: 5
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: scmgalaxy/nginx-devopsschoolv1
kubectl scale --replicas=1 rc/rajrc
162 vi rc.yaml
163 kubectl get rc
164 kubectl apply -f rc.yaml
165 kubectl get rc
166 kubectl get pods
167 kubectl describe rc rajrc
168 clear
169 kubectl edit rc rajrc
170 kubectl get pods
171 vi rc.yaml
172 kubectl apply -f rc.yaml
173 kubectl get pods
174 kubectl
175 clear
176 kubectl scale -h
177 clear
178 kubectl scale --replicas=1 rc/rajrc
179 kubectl get pods
180 kubectl scale --replicas=20 rc/rajrc
181 kubectl get pods
182 kubectl scale --replicas=2 rc/rajrc
183 kubectl get pods
184 clear
185 kubectl scale --replicas=1 rc/rajrc
186 kubectl scale --replicas=10 rc/rajrc
187 kubectl get pods
188 kubectl delete pod rajrc-2gpfj rajrc-5pkzb rajrc-7z248
189 kubectl get pods
190 kubectl get rc
191 kubectl delete rc rajrc
192 kubectl get pods
Code language: JavaScript (javascript)ReplicaSets == ReplicationController
Kubernetes Desployment
Service
224 kubectl apply -f pod1.yaml
225 kubectl apply -f pod2.yaml
226 kubectl get pods -o wide --show-labels
227 curl http://192.168.1.121
228 curl http://192.168.1.122
229 clear
230 ls
231 kubectl create service
232 kubectl create service clusterip -h
233 clear
234 kubectl create service clusterip svc1 --tcp=5678:80
235 kubectl get svc
236 kubectl describe svc scv1
237 kubectl describe svc vc1
238 kubectl describe svc svc1
239 kubectl get pods -o wide --show-labels
240 kubectl edit svc svc1
241 kubectl describe svc svc1
242 vi pod1.yaml
243 kubectl apply -f pod1.yaml
244 kubectl describe svc svc1
245 kubectl edit pod rajesh2
246 kubectl describe svc svc1
247 curl http://10.100.79.184
248 curl http://10.100.79.184:5678
249 clear
250 kubectl create svc -h
Code language: PHP (php) 251 history
252 kubectl create svc -h
253 kubectl create service clusterip np --tcp=5678:80 --type=NodePort
254 kubectl create service nodeport np --tcp=5678:80
255 kubectl get svc
256 kubectl describe svc np
257 kubectl edit svc np
258* kubectl describe svc 0
259 kubectl get pods --show-labels
260 kubectl edit svc np
261 kubectl get pods --show-labels
262 kubectl describe svc np
263 historyt
264 history
265 kubectl create svc -h
266 kubectl create service loadbalancer lb --tcp=5678:80
267 kubectl get svc
268 kubectl edi svc lb
269 kubectl edit svc lb
270 kubectl get svc
271 clear
272 curl https://demo-415762973.ap-south-1.elb.amazonaws.com/
273 curl https://demo-415762973.ap-south-1.elb.amazonaws.com
274 curl http://demo-415762973.ap-south-1.elb.amazonaws.com
Code language: JavaScript (javascript)PV AND PVC
DaemonSet
Statefulset
Day-1
Understanding the Need of Kubernetes
Understanding Kubernetes Architecture
Understanding Kubernetes Masters and its Component
Understanding Kubernetes Nodes and its Component
Understand Kubernetes Concepts
Understand Kubernetes Terminology
Kubernetes Clusters Requirements
Understanding Kubernetes Clusters using kubeadm
Understanding a concept of Namespace
Demo: Define your first Kubernetes pod
Demo: Working and Deep Dive with Kubernetes pod
Understanding Kubernetes replication controllers
Understanding Kubernetes deployments
Demo: Working and Deep Dive with Kubernetes deployment
Understanding Kubernetes Lebels
Demo: Working with Kubernetes Lebels
Understanding Kubernetes Services
Demo: Working and Deep Dive with Kubernetes Services
Day-2
Understanding Kubernetes Volumes
Understanding Types of Volumes
Static and Dynamic Provisioning
Understanding Persistent Volume and Persistent Volume Claim
Understanding ConfigMap and Secret Understanding Storage Class
Demo: Working with ConfigMap and Secret
Understanding StatefulSet and DaemonSet
Understanding CronJob and Job
What is a Kubernetes Pod networking?
How does networking work in Kubernetes?
How to implement Kubernetes networking?
The Kubernetes network model
Kubernetes Network Plugins
Understanding Flannel Network Plugins
Understanding Project Calico Network Plugins
Understanding Weave Net Network Plugins
Demo: Implementing Project Calico Network Plugins
Understanding Ingress and Ingress Controllers
Understanding Network Policies
Understanding DNS for Services and Pods
Day-3
Understanding Kubernetes Pods Observability
Troubleshooting Control Plane Failure
Troubleshooting Worker Node Failure
Troubleshooting Networking
Demo: Upgrading the Kubernetes Cluster
Demo: Backing Up and Restoring a Kubernetes Cluster
Monitoring the Cluster Components
Monitoring the Applications Running within a Cluster
Managing Cluster Component Logs
Managing Application Logs
CRDs
Operators
Code language: JavaScript (javascript)Jobs and Cron jobs
SA ROLE ROLEBINDING
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
namespace: rajesh
name: rajesh-role
rules:
- apiGroups: ["", "extensions", "apps"]
resources: ["deployments", "replicasets", "pods"]
verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rajesh-binding
namespace: rajesh
subjects:
- kind: User
name: rajesh
apiGroup: ""
roleRef:
kind: Role
name: rajesh-role
apiGroup: ""Code language: JavaScript (javascript) 388 clear
389 ls
390 pwd
391 openssl genrsa -out rajesh.key 2048
392 ls
393 openssl req -new -key rajesh.key -out rajesh.csr -subj "/CN=rajesh/O=bitnami"
394 ls
395 openssl x509 -req -in rajesh.csr -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out employee.crt -days 500
396 ls
397 openssl x509 -req -in rajesh.csr -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out rajesh.crt -days 500
398 ls
399 rm -rf employee.crt
400 ls
401 clear
402 kubectl config view
403 kubectl config set-credentials rajesh --client-certificate=/root/rajesh/rajesh.crt --client-key=/root/rajesh/rajesh.key
404 kubectl config view
405 clear
406 kubectl config set-context rajesh-context --cluster=kubernetes --namespace=rajesh --user=rajesh
407 kubectl config view
408 kubectl create namespace rajesh
409 kubectl --context=rajesh-context get pods
410 clear
411 kubectl get sa
412 kubectl create sa devops
413 kubectl get sa
414 kubectl api-resources
415 clear
416 ls
417 vi role.yaml
418 kubectl get roles
419 kubectl get rolesbinding
420 kubectl apply -f role.yaml
421 kubectl api-resources
422 vi role.yaml
423 kubectl apply -f role.yaml
424 kubectl get roles
425 kubectl get roles -n=rajesh
426 clear
427 vi rb.yaml;
428 vi rb.yaml
429 kubectl apply rb.yaml
430 kubectl apply -f rb.yaml
431 kubectl get rolebinding -n=rajesh
432 kubectl --context=rajesh-context get pods
433 kubectl --context=rajesh-context get svc
434 kubectl api-resources
435 clear
436 kubectl --context=employee-context run nginx --image=nginx
437 kubectl --context=rajesh-context run nginx --image=nginx
438 kubectl get pods -n=rajesh
Code language: JavaScript (javascript)Secret
Configmap
Operators
Network policy
How to take a backup and restore
Usage:
kubeadm [command]
Available Commands:
certs Commands related to handling kubernetes certificates
completion Output shell completion code for the specified shell (bash or zsh)
config Manage configuration for a kubeadm cluster persisted in a ConfigMap in the cluster
help Help about any command
init Run this command in order to set up the Kubernetes control plane
join Run this on any machine you wish to join an existing cluster
kubeconfig Kubeconfig file utilities
reset Performs a best effort revert of changes made to this host by 'kubeadm init' or 'kubeadm join'
token Manage bootstrap tokens
upgrade Upgrade your cluster smoothly to a newer version with this command
version Print the version of kubeadm
Flags:
--add-dir-header If true, adds the file directory to the header of the log messages
-h, --help help for kubeadm
--log-file string If non-empty, use this log file (no effect when -logtostderr=true)
--log-file-max-size uint Defines the maximum size a log file can grow to (no effect when -logtostderr=true). Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
--one-output If true, only write logs to their native severity level (vs also writing to each lower severity level; no effect when -logtostderr=true)
--rootfs string [EXPERIMENTAL] The path to the 'real' host root filesystem.
--skip-headers If true, avoid header prefixes in the log messages
--skip-log-headers If true, avoid headers when opening log files (no Code language: PHP (php)Monitoring
=====================================================
Obserbability and Monitoring
=====================================================
Collection - Metrices + Logs + Trace
======================================================
Promethus + Elasticsearch + jaeger
Store ->
========================================================
Analysis -> Grafana + Kibana +
Alerts
Dashboard
747 kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
748 kubectl top node
749 kubectl get all
750 kubectl get all --all-namespaces
751 cleaer
752 \clear
753 kubectl get all -n=kube-systems
754 kubectl get all -n=kube-system
755 kubectl describe pod pod/metrics-server-856f767b-mf9nq -n=kube-systems
756 kubectl describe pod pod/metrics-server-856f767b-mf9nq -n=kube-system
757 clear
758 kubectl describe pod/metrics-server-856f767b-mf9nq -n=kube-system
759 kubectl logs pod/metrics-server-856f767b-mf9nq -n=kube-system
760 clear
761 history
762 clear
763 kubectl delete -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
764 wget https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
765 clear
766 vi components.yaml
767 kubectl apply -f components.yaml
768 kubectl get all -n=kube-system
769 kubectl top node
770 kubectl top pod
Code language: JavaScript (javascript)Notes –
Tutorials – https://www.devopsschool.com/blog/
Slides – https://www.devopsschool.com/slides/
Commands – https://www.devopsschool.com/commands
Videos – https://www.devopsschool.com/blog/top-4-youtube-channel-for-free-videos-tutorials/
How to reach out – https://www.rajeshkumar.xyz/