kubernetes-essentials

Name: kubernetes-essentials
Author: mjunaidca

26stars11forks

How to install kubernetes-essentials?

mjunaidca/mjs-agent-skills/kubernetes-essentials

$npx -y skills add mjunaidca/mjs-agent-skills --skill kubernetes-essentials

Installs into the current project.

Summary

Quick reference for Kubernetes core concepts and kubectl commands. This skill should be used as a refresher for basic K8s operations including pods, deployments, services, configmaps, secrets, and namespaces. Use this skill when working with Kubernetes clusters for Phase IV+ depl

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SKILL.md

1	# Kubernetes Essentials Skill
2
3	## Core Concepts Overview
4
5	### Kubernetes Architecture
6
7	```
8	┌─────────────────────────────────────────────────────────────────┐
9	│ Control Plane │
10	│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────┐ │
11	│ │ API Server │ │ Scheduler │ │ Controller │ │ etcd │ │
12	│ │ │ │ │ │ Manager │ │ │ │
13	│ └─────────────┘ └─────────────┘ └─────────────┘ └─────────┘ │
14	└─────────────────────────────────────────────────────────────────┘
15	│
16	▼
17	┌─────────────────────────────────────────────────────────────────┐
18	│ Worker Nodes │
19	│ ┌─────────────────────────────────────────────────────────────┐ │
20	│ │ Node 1 Node 2 │ │
21	│ │ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ │
22	│ │ │ Pod │ │ Pod │ │ Pod │ │ Pod │ │ │
23	│ │ │┌───────┐│ │┌───────┐│ │┌───────┐│ │┌───────┐│ │ │
24	│ │ ││ Cont. ││ ││ Cont. ││ ││ Cont. ││ ││ Cont. ││ │ │
25	│ │ │└───────┘│ │└───────┘│ │└───────┘│ │└───────┘│ │ │
26	│ │ └─────────┘ └─────────┘ └─────────┘ └─────────┘ │ │
27	│ │ kubelet, kube-proxy kubelet, kube-proxy │ │
28	│ └─────────────────────────────────────────────────────────────┘ │
29	└─────────────────────────────────────────────────────────────────┘
30	```
31
32	### Key Resources
33
34	\| Resource \| Purpose \| Shorthand \|
35	\|----------\|---------\|-----------\|
36	\| Pod \| Smallest deployable unit, runs containers \| `po` \|
37	\| Deployment \| Manages ReplicaSets, handles rollouts \| `deploy` \|
38	\| Service \| Network endpoint for pods \| `svc` \|
39	\| ConfigMap \| Configuration data (non-sensitive) \| `cm` \|
40	\| Secret \| Sensitive configuration data \| `secret` \|
41	\| Namespace \| Virtual cluster isolation \| `ns` \|
42	\| Ingress \| External HTTP/S routing \| `ing` \|
43	\| PersistentVolumeClaim \| Storage request \| `pvc` \|
44
45	## Essential kubectl Commands
46
47	### Context and Configuration
48
49	```bash
50	# View current context
51	kubectl config current-context
52
53	# List all contexts
54	kubectl config get-contexts
55
56	# Switch context
57	kubectl config use-context my-context
58
59	# Set default namespace
60	kubectl config set-context --current --namespace=my-namespace
61	```
62
63	### Getting Information
64
65	```bash
66	# List resources
67	kubectl get pods # Pods in current namespace
68	kubectl get pods -A # All namespaces
69	kubectl get pods -o wide # Additional details (node, IP)
70	kubectl get pods -o yaml # Full YAML output
71	kubectl get all # All common resources
72
73	# Describe resources (detailed info + events)
74	kubectl describe pod my-pod
75	kubectl describe deployment my-deploy
76
77	# View logs
78	kubectl logs my-pod # Current logs
79	kubectl logs my-pod -f # Follow logs
80	kubectl logs my-pod -c container # Specific container
81	kubectl logs my-pod --previous # Previous container (after crash)
82	```
83
84	### Creating Resources
85
86	```bash
87	# From YAML file
88	kubectl apply -f manifest.yaml
89
90	# Imperative creation
91	kubectl create deployment nginx --image=nginx
92	kubectl create service clusterip nginx --tcp=80:80
93	kubectl create configmap my-config --from-literal=key=value
94	kubectl create secret generic my-secret --from-literal=password=secret123
95
96	# Generate YAML without applying
97	kubectl create deployment nginx --image=nginx --dry-run=client -o yaml > deploy.yaml
98	```
99
100	### Modifying Resources
101
102	```bash
103	# Edit in place
104	kubectl edit deployment my-deploy
105
106	# Scale deployment
107	kubectl scale deployment my-deploy --replicas=3
108
109	# Update image
110	kubectl set image deployment/my-deploy container=image:v2
111
112	# Patch resource
113	kubectl patch deployment my-deploy -p '{"spec":{"replicas":5}}'
114	```
115
116	### Deleting Resources
117
118	```bash
119	# Delete by name
120	kubectl delete pod my-pod
121	kubectl delete deployment my-deploy
122
123	# Delete from file
124	kubectl delete -f manifest.yaml
125
126	# Delete all pods in namespace
127	kubectl delete pods --all -n my-namespace
128
129	# Force delete stuck pod
130	kubectl delete pod my-pod --grace-period=0 --force
131	```
132
133	### Executing Commands
134
135	```bash
136	# Run command in pod
137	kubectl exec my-pod -- ls /app
138
139	# Interactive shell
140	kubectl exec -it my-pod -- /bin/sh
141
142	# Specific container
143	kubectl exec -it my-pod -c my-container -- /bin/bash
144	```
145
146	### Port Forwarding
147
148	```bash
149	# Forward pod port to local
150	kubectl port-forward pod/my-pod 8080:80
151
152	# Forward service port
153	kubectl port-forward svc/my-service 8080:80
154	```
155
156	## Resource Manifests
157
158	### Pod
159
160	```yaml
161	apiVersion: v1
162	kind: Pod
163	metadata:

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Type

kubernetes-essentials

26stars11forks

View on GitHub

How to install kubernetes-essentials?

mjunaidca/mjs-agent-skills/kubernetes-essentials

$npx -y skills add mjunaidca/mjs-agent-skills --skill kubernetes-essentials

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Kubernetes Essentials Skill
2
3	## Core Concepts Overview
4
5	### Kubernetes Architecture
6
7	```
8	┌─────────────────────────────────────────────────────────────────┐
9	│ Control Plane │
10	│ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────┐ │
11	│ │ API Server │ │ Scheduler │ │ Controller │ │ etcd │ │
12	│ │ │ │ │ │ Manager │ │ │ │
13	│ └─────────────┘ └─────────────┘ └─────────────┘ └─────────┘ │
14	└─────────────────────────────────────────────────────────────────┘
15	│
16	▼
17	┌─────────────────────────────────────────────────────────────────┐
18	│ Worker Nodes │
19	│ ┌─────────────────────────────────────────────────────────────┐ │
20	│ │ Node 1 Node 2 │ │
21	│ │ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ │ │
22	│ │ │ Pod │ │ Pod │ │ Pod │ │ Pod │ │ │
23	│ │ │┌───────┐│ │┌───────┐│ │┌───────┐│ │┌───────┐│ │ │
24	│ │ ││ Cont. ││ ││ Cont. ││ ││ Cont. ││ ││ Cont. ││ │ │
25	│ │ │└───────┘│ │└───────┘│ │└───────┘│ │└───────┘│ │ │
26	│ │ └─────────┘ └─────────┘ └─────────┘ └─────────┘ │ │
27	│ │ kubelet, kube-proxy kubelet, kube-proxy │ │
28	│ └─────────────────────────────────────────────────────────────┘ │
29	└─────────────────────────────────────────────────────────────────┘
30	```
31
32	### Key Resources
33
34	\| Resource \| Purpose \| Shorthand \|
35	\|----------\|---------\|-----------\|
36	\| Pod \| Smallest deployable unit, runs containers \| `po` \|
37	\| Deployment \| Manages ReplicaSets, handles rollouts \| `deploy` \|
38	\| Service \| Network endpoint for pods \| `svc` \|
39	\| ConfigMap \| Configuration data (non-sensitive) \| `cm` \|
40	\| Secret \| Sensitive configuration data \| `secret` \|
41	\| Namespace \| Virtual cluster isolation \| `ns` \|
42	\| Ingress \| External HTTP/S routing \| `ing` \|
43	\| PersistentVolumeClaim \| Storage request \| `pvc` \|
44
45	## Essential kubectl Commands
46
47	### Context and Configuration
48
49	```bash
50	# View current context
51	kubectl config current-context
52
53	# List all contexts
54	kubectl config get-contexts
55
56	# Switch context
57	kubectl config use-context my-context
58
59	# Set default namespace
60	kubectl config set-context --current --namespace=my-namespace
61	```
62
63	### Getting Information
64
65	```bash
66	# List resources
67	kubectl get pods # Pods in current namespace
68	kubectl get pods -A # All namespaces
69	kubectl get pods -o wide # Additional details (node, IP)
70	kubectl get pods -o yaml # Full YAML output
71	kubectl get all # All common resources
72
73	# Describe resources (detailed info + events)
74	kubectl describe pod my-pod
75	kubectl describe deployment my-deploy
76
77	# View logs
78	kubectl logs my-pod # Current logs
79	kubectl logs my-pod -f # Follow logs
80	kubectl logs my-pod -c container # Specific container
81	kubectl logs my-pod --previous # Previous container (after crash)
82	```
83
84	### Creating Resources
85
86	```bash
87	# From YAML file
88	kubectl apply -f manifest.yaml
89
90	# Imperative creation
91	kubectl create deployment nginx --image=nginx
92	kubectl create service clusterip nginx --tcp=80:80
93	kubectl create configmap my-config --from-literal=key=value
94	kubectl create secret generic my-secret --from-literal=password=secret123
95
96	# Generate YAML without applying
97	kubectl create deployment nginx --image=nginx --dry-run=client -o yaml > deploy.yaml
98	```
99
100	### Modifying Resources
101
102	```bash
103	# Edit in place
104	kubectl edit deployment my-deploy
105
106	# Scale deployment
107	kubectl scale deployment my-deploy --replicas=3
108
109	# Update image
110	kubectl set image deployment/my-deploy container=image:v2
111
112	# Patch resource
113	kubectl patch deployment my-deploy -p '{"spec":{"replicas":5}}'
114	```
115
116	### Deleting Resources
117
118	```bash
119	# Delete by name
120	kubectl delete pod my-pod
121	kubectl delete deployment my-deploy
122
123	# Delete from file
124	kubectl delete -f manifest.yaml
125
126	# Delete all pods in namespace
127	kubectl delete pods --all -n my-namespace
128
129	# Force delete stuck pod
130	kubectl delete pod my-pod --grace-period=0 --force
131	```
132
133	### Executing Commands
134
135	```bash
136	# Run command in pod
137	kubectl exec my-pod -- ls /app
138
139	# Interactive shell
140	kubectl exec -it my-pod -- /bin/sh
141
142	# Specific container
143	kubectl exec -it my-pod -c my-container -- /bin/bash
144	```
145
146	### Port Forwarding
147
148	```bash
149	# Forward pod port to local
150	kubectl port-forward pod/my-pod 8080:80
151
152	# Forward service port
153	kubectl port-forward svc/my-service 8080:80
154	```
155
156	## Resource Manifests
157
158	### Pod
159
160	```yaml
161	apiVersion: v1
162	kind: Pod
163	metadata:

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