kustomize

Name: kustomize
Author: BagelHole

42stars4forks

How to install kustomize?

bagelhole/devops-security-agent-skills/kustomize

$npx -y skills add BagelHole/DevOps-Security-Agent-Skills --skill kustomize

Installs into the current project.

Summary

Customize Kubernetes manifests without templating using Kustomize. Create base configurations with environment overlays, manage configuration variants, and patch resources declaratively. Use when managing Kubernetes configurations across multiple environments without Helm.

Files · 1

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SKILL.md

1	# Kustomize
2
3	Customize Kubernetes resources declaratively without templating.
4
5	## When to Use This Skill
6
7	Use this skill when:
8	- Managing Kubernetes configs across environments
9	- Patching existing manifests without modification
10	- Creating configuration variants from bases
11	- Customizing third-party manifests
12	- Preferring declarative over templating approach
13
14	## Prerequisites
15
16	- kubectl 1.14+ (includes kustomize)
17	- Or standalone kustomize CLI
18	- Basic Kubernetes manifest knowledge
19
20	## Directory Structure
21
22	```
23	myapp/
24	├── base/
25	│ ├── kustomization.yaml
26	│ ├── deployment.yaml
27	│ ├── service.yaml
28	│ └── configmap.yaml
29	└── overlays/
30	├── development/
31	│ ├── kustomization.yaml
32	│ └── replica-patch.yaml
33	├── staging/
34	│ ├── kustomization.yaml
35	│ └── namespace.yaml
36	└── production/
37	├── kustomization.yaml
38	├── replica-patch.yaml
39	└── resource-patch.yaml
40	```
41
42	## Base Configuration
43
44	### kustomization.yaml
45
46	```yaml
47	# base/kustomization.yaml
48	apiVersion: kustomize.config.k8s.io/v1beta1
49	kind: Kustomization
50
51	resources:
52	- deployment.yaml
53	- service.yaml
54	- configmap.yaml
55
56	commonLabels:
57	app: myapp
58
59	commonAnnotations:
60	managed-by: kustomize
61	```
62
63	### Base Resources
64
65	```yaml
66	# base/deployment.yaml
67	apiVersion: apps/v1
68	kind: Deployment
69	metadata:
70	name: myapp
71	spec:
72	replicas: 1
73	selector:
74	matchLabels:
75	app: myapp
76	template:
77	metadata:
78	labels:
79	app: myapp
80	spec:
81	containers:
82	- name: myapp
83	image: myapp:latest
84	ports:
85	- containerPort: 8080
86	resources:
87	requests:
88	memory: "64Mi"
89	cpu: "100m"
90	limits:
91	memory: "128Mi"
92	cpu: "200m"
93	```
94
95	## Overlays
96
97	### Development Overlay
98
99	```yaml
100	# overlays/development/kustomization.yaml
101	apiVersion: kustomize.config.k8s.io/v1beta1
102	kind: Kustomization
103
104	resources:
105	- ../../base
106
107	namespace: myapp-dev
108
109	namePrefix: dev-
110
111	commonLabels:
112	environment: development
113
114	images:
115	- name: myapp
116	newTag: dev-latest
117	```
118
119	### Production Overlay
120
121	```yaml
122	# overlays/production/kustomization.yaml
123	apiVersion: kustomize.config.k8s.io/v1beta1
124	kind: Kustomization
125
126	resources:
127	- ../../base
128
129	namespace: myapp-prod
130
131	namePrefix: prod-
132
133	commonLabels:
134	environment: production
135
136	replicas:
137	- name: myapp
138	count: 5
139
140	images:
141	- name: myapp
142	newName: registry.example.com/myapp
143	newTag: v2.0.0
144
145	patches:
146	- path: resource-patch.yaml
147	```
148
149	## Patching
150
151	### Strategic Merge Patch
152
153	```yaml
154	# overlays/production/resource-patch.yaml
155	apiVersion: apps/v1
156	kind: Deployment
157	metadata:
158	name: myapp
159	spec:
160	template:
161	spec:
162	containers:
163	- name: myapp
164	resources:
165	requests:
166	memory: "256Mi"
167	cpu: "500m"
168	limits:
169	memory: "512Mi"
170	cpu: "1000m"
171	```
172
173	### JSON Patch
174
175	```yaml
176	# kustomization.yaml
177	patches:
178	- target:
179	kind: Deployment
180	name: myapp
181	patch: \|-
182	- op: replace
183	path: /spec/replicas
184	value: 5
185	- op: add
186	path: /spec/template/spec/containers/0/env
187	value:
188	- name: LOG_LEVEL
189	value: info
190	```
191
192	### Inline Patches
193
194	```yaml
195	# kustomization.yaml
196	patches:
197	- patch: \|-
198	apiVersion: apps/v1
199	kind: Deployment
200	metadata:
201	name: myapp
202	spec:
203	replicas: 3
204	target:
205	kind: Deployment
206	name: myapp
207	```
208
209	## Configuration Generation
210
211	### ConfigMap Generator
212
213	```yaml
214	# kustomization.yaml
215	configMapGenerator:
216	- name: myapp-config
217	literals:
218	- APP_ENV=production
219	- LOG_LEVEL=info
220	files:
221	- config.yaml
222	envs:
223	- config.env
224	options:
225	disableNameSuffixHash: false
226	```
227
228	### Secret Generator
229
230	```yaml
231	# kustomization.yaml
232	secretGenerator:
233	- name: myapp-secrets
234	literals:
235	- api-key=secret123
236	files:
237	- tls.crt
238	- tls.key
239	type: kubernetes.io/tls
240	```
241
242	## Image Transformations
243
244	```yaml
245	# kustomization.yaml
246	images:
247	# Change tag
248	- name: myapp
249	newTag: v2.0.0
250
251	# Change registry
252	- name: myapp
253	newName: registry.example.com/myapp
254	newTag: v2.0.0
255
256	# Use digest
257	- name: myapp
258	digest: sha256:abc123...
259	```
260
261	## Resource Transformations
262
263	### Name Prefix/Suffix
264
265	```yaml
266	# kustomization.yaml
267	namePrefix: prod-
268	nameSuffix: -v2
269	```
270
271	### Namespace
272
273	```yaml
274	# kustomization.yaml
275	namespace: production
276	```
277
278	### Labels and Annotations
279
280	```yaml
281	# kustomization.yaml
282	commonLabels:
283	app.kubernetes.io/name: myapp
284	app.kubernetes.io/environment: production
285
286	commonAnnotations:
287	example.com/owner: team-a
288	```
289
290	### Replicas
291
292	```yaml
293	# k

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kustomize

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View on GitHub

How to install kustomize?

bagelhole/devops-security-agent-skills/kustomize

$npx -y skills add BagelHole/DevOps-Security-Agent-Skills --skill kustomize

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Kustomize
2
3	Customize Kubernetes resources declaratively without templating.
4
5	## When to Use This Skill
6
7	Use this skill when:
8	- Managing Kubernetes configs across environments
9	- Patching existing manifests without modification
10	- Creating configuration variants from bases
11	- Customizing third-party manifests
12	- Preferring declarative over templating approach
13
14	## Prerequisites
15
16	- kubectl 1.14+ (includes kustomize)
17	- Or standalone kustomize CLI
18	- Basic Kubernetes manifest knowledge
19
20	## Directory Structure
21
22	```
23	myapp/
24	├── base/
25	│ ├── kustomization.yaml
26	│ ├── deployment.yaml
27	│ ├── service.yaml
28	│ └── configmap.yaml
29	└── overlays/
30	├── development/
31	│ ├── kustomization.yaml
32	│ └── replica-patch.yaml
33	├── staging/
34	│ ├── kustomization.yaml
35	│ └── namespace.yaml
36	└── production/
37	├── kustomization.yaml
38	├── replica-patch.yaml
39	└── resource-patch.yaml
40	```
41
42	## Base Configuration
43
44	### kustomization.yaml
45
46	```yaml
47	# base/kustomization.yaml
48	apiVersion: kustomize.config.k8s.io/v1beta1
49	kind: Kustomization
50
51	resources:
52	- deployment.yaml
53	- service.yaml
54	- configmap.yaml
55
56	commonLabels:
57	app: myapp
58
59	commonAnnotations:
60	managed-by: kustomize
61	```
62
63	### Base Resources
64
65	```yaml
66	# base/deployment.yaml
67	apiVersion: apps/v1
68	kind: Deployment
69	metadata:
70	name: myapp
71	spec:
72	replicas: 1
73	selector:
74	matchLabels:
75	app: myapp
76	template:
77	metadata:
78	labels:
79	app: myapp
80	spec:
81	containers:
82	- name: myapp
83	image: myapp:latest
84	ports:
85	- containerPort: 8080
86	resources:
87	requests:
88	memory: "64Mi"
89	cpu: "100m"
90	limits:
91	memory: "128Mi"
92	cpu: "200m"
93	```
94
95	## Overlays
96
97	### Development Overlay
98
99	```yaml
100	# overlays/development/kustomization.yaml
101	apiVersion: kustomize.config.k8s.io/v1beta1
102	kind: Kustomization
103
104	resources:
105	- ../../base
106
107	namespace: myapp-dev
108
109	namePrefix: dev-
110
111	commonLabels:
112	environment: development
113
114	images:
115	- name: myapp
116	newTag: dev-latest
117	```
118
119	### Production Overlay
120
121	```yaml
122	# overlays/production/kustomization.yaml
123	apiVersion: kustomize.config.k8s.io/v1beta1
124	kind: Kustomization
125
126	resources:
127	- ../../base
128
129	namespace: myapp-prod
130
131	namePrefix: prod-
132
133	commonLabels:
134	environment: production
135
136	replicas:
137	- name: myapp
138	count: 5
139
140	images:
141	- name: myapp
142	newName: registry.example.com/myapp
143	newTag: v2.0.0
144
145	patches:
146	- path: resource-patch.yaml
147	```
148
149	## Patching
150
151	### Strategic Merge Patch
152
153	```yaml
154	# overlays/production/resource-patch.yaml
155	apiVersion: apps/v1
156	kind: Deployment
157	metadata:
158	name: myapp
159	spec:
160	template:
161	spec:
162	containers:
163	- name: myapp
164	resources:
165	requests:
166	memory: "256Mi"
167	cpu: "500m"
168	limits:
169	memory: "512Mi"
170	cpu: "1000m"
171	```
172
173	### JSON Patch
174
175	```yaml
176	# kustomization.yaml
177	patches:
178	- target:
179	kind: Deployment
180	name: myapp
181	patch: \|-
182	- op: replace
183	path: /spec/replicas
184	value: 5
185	- op: add
186	path: /spec/template/spec/containers/0/env
187	value:
188	- name: LOG_LEVEL
189	value: info
190	```
191
192	### Inline Patches
193
194	```yaml
195	# kustomization.yaml
196	patches:
197	- patch: \|-
198	apiVersion: apps/v1
199	kind: Deployment
200	metadata:
201	name: myapp
202	spec:
203	replicas: 3
204	target:
205	kind: Deployment
206	name: myapp
207	```
208
209	## Configuration Generation
210
211	### ConfigMap Generator
212
213	```yaml
214	# kustomization.yaml
215	configMapGenerator:
216	- name: myapp-config
217	literals:
218	- APP_ENV=production
219	- LOG_LEVEL=info
220	files:
221	- config.yaml
222	envs:
223	- config.env
224	options:
225	disableNameSuffixHash: false
226	```
227
228	### Secret Generator
229
230	```yaml
231	# kustomization.yaml
232	secretGenerator:
233	- name: myapp-secrets
234	literals:
235	- api-key=secret123
236	files:
237	- tls.crt
238	- tls.key
239	type: kubernetes.io/tls
240	```
241
242	## Image Transformations
243
244	```yaml
245	# kustomization.yaml
246	images:
247	# Change tag
248	- name: myapp
249	newTag: v2.0.0
250
251	# Change registry
252	- name: myapp
253	newName: registry.example.com/myapp
254	newTag: v2.0.0
255
256	# Use digest
257	- name: myapp
258	digest: sha256:abc123...
259	```
260
261	## Resource Transformations
262
263	### Name Prefix/Suffix
264
265	```yaml
266	# kustomization.yaml
267	namePrefix: prod-
268	nameSuffix: -v2
269	```
270
271	### Namespace
272
273	```yaml
274	# kustomization.yaml
275	namespace: production
276	```
277
278	### Labels and Annotations
279
280	```yaml
281	# kustomization.yaml
282	commonLabels:
283	app.kubernetes.io/name: myapp
284	app.kubernetes.io/environment: production
285
286	commonAnnotations:
287	example.com/owner: team-a
288	```
289
290	### Replicas
291
292	```yaml
293	# k

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