docker

Name: docker
Author: mjunaidca

23installs11forks

How to install docker?

mjunaidca/mjs-agent-skills/docker

$npx -y skills add mjunaidca/mjs-agent-skills --skill docker

Installs into the current project.

Summary

Production-grade Docker containerization for Python and Node.js applications. This skill should be used when users ask to containerize applications, create Dockerfiles, dockerize projects, or set up Docker Compose. Auto-detects project structure, analyzes .env for secrets, valida

Files · 1

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SKILL.md

1	# Docker
2
3	Production-grade Docker containerization with security-first defaults.
4
5	---
6
7	## Resource Detection & Adaptation
8
9	Before generating Dockerfiles/Compose, detect the environment:
10
11	```bash
12	# Detect host machine memory
13	sysctl -n hw.memsize 2>/dev/null \| awk '{print $0/1024/1024/1024 " GB"}' \|\| \
14	grep MemTotal /proc/meminfo \| awk '{print $2/1024/1024 " GB"}'
15
16	# Detect Docker allocated resources
17	docker info --format 'Memory: {{.MemTotal}}, CPUs: {{.NCPU}}'
18
19	# Detect available disk space
20	docker system df
21	```
22
23	Adapt configurations based on detection:
24
25	\| Detected Docker Memory \| Profile \| Build Memory \| Container Limits \|
26	\|-----------------------\|---------\|--------------\|------------------\|
27	\| < 4GB \| Constrained \| 1GB \| 256Mi \|
28	\| 4-8GB \| Minimal \| 2GB \| 512Mi \|
29	\| 8-12GB \| Standard \| 4GB \| 1Gi \|
30	\| > 12GB \| Extended \| 8GB \| 2Gi \|
31
32	### Agent Behavior
33
34	1. Detect Docker resources before generating compose.yaml
35	2. Adapt resource limits to available memory
36	3. Warn if build may fail due to insufficient resources
37	4. Calculate safe limits: `docker_memory * 0.6 / container_count`
38
39	### Adaptive Compose Templates
40
41	Constrained (< 4GB Docker):
42	```yaml
43	services:
44	app:
45	deploy:
46	resources:
47	limits:
48	memory: 256M
49	cpus: '0.25'
50	build:
51	args:
52	- BUILDKIT_STEP_LOG_MAX_SIZE=10000000
53	```
54	⚠️ Agent should warn: "Docker memory low. Multi-stage builds may fail."
55
56	Standard (4-8GB Docker):
57	```yaml
58	services:
59	app:
60	deploy:
61	resources:
62	limits:
63	memory: 512M
64	cpus: '0.5'
65	reservations:
66	memory: 256M
67	```
68
69	Extended (> 8GB Docker):
70	```yaml
71	services:
72	app:
73	deploy:
74	resources:
75	limits:
76	memory: 1G
77	cpus: '1.0'
78	reservations:
79	memory: 512M
80	```
81
82	### Pre-Build Validation
83
84	Before running `docker build`, agent should verify:
85	```bash
86	# Check available memory
87	docker info --format '{{.MemTotal}}' \| awk '{if ($1 < 4000000000) print "WARNING: Low memory"}'
88	```
89
90	If constrained: use `--memory` flag and warn user about potential build failures.
91
92	---
93
94	## What This Skill Does
95
96	Analysis & Detection:
97	- Auto-detects runtime, framework, version, entrypoint (no questions)
98	- Scans .env files, classifies secrets vs build-args vs runtime config
99	- Detects native dependencies, generates correct build deps
100	- Identifies missing configs (Next.js standalone, health endpoints)
101
102	Generation:
103	- Creates multi-stage Dockerfiles customized to YOUR project structure
104	- Generates compose.yaml with security defaults (non-root, read-only, resource limits)
105	- Adds health endpoints if missing
106	- Fixes configuration issues (adds `output: 'standalone'` to Next.js, etc.)
107
108	Validation:
109	- Builds both dev and production targets before delivering
110	- Verifies health endpoints work
111	- Confirms non-root user in production
112	- Warns about any secrets that would leak into image
113	- Reports image size
114
115	Security:
116	- Never bakes secrets into images
117	- Non-root user by default
118	- Minimal attack surface (multi-stage builds)
119	- Pinned versions (no `:latest`)
120	- Security scan command included
121
122	## What This Skill Does NOT Do
123
124	- Generate Kubernetes manifests (use dedicated k8s skill)
125	- Create Helm charts (use dedicated helm skill)
126	- Handle Bun/Deno (use dedicated skills)
127	- Copy templates blindly without customization
128
129	---
130
131	## Before Implementation
132
133	Gather context to ensure successful implementation:
134
135	\| Source \| Gather \|
136	\|--------\|--------\|
137	\| Codebase \| Package files, existing Dockerfile, .env patterns \|
138	\| Conversation \| Dev vs production target, base image preferences \|
139	\| Skill References \| Framework patterns, multi-stage builds, security \|
140	\| User Guidelines \| Registry conventions, naming standards \|
141
142	---
143
144	## Required Clarifications
145
146	Ask when not auto-detectable:
147
148	\| Question \| When to Ask \|
149	\|----------\|-------------\|
150	\| Target environment \| "Building for development or production?" \|
151	\| Base image preference \| "Standard slim images or enterprise hardened?" \|
152	\| Existing Docker files \| "Enhance existing Dockerfile or create new?" \|
153	\| Registry target \| "Local only or pushing to registry?" \|
154
155	---
156
157	## Detect Runtime
158
159	\| File Present \| Runtime \| Package Manager \|
160	\|--------------\|---------\|-----------------\|
161	\| `requirements.txt`, `pyproject.toml`, `uv.lock` \| Python \| pip/uv \|
162	\| `pnpm-lock.yaml` \| Node.js \| pnpm \|
163	\| `yarn.lock` \| Node.js \| yarn \|
164	\| `package-lock.json` \| Node.js \| npm \|
165
166	-

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6 picks

Type

docker

23installs11forks

View on GitHub

How to install docker?

mjunaidca/mjs-agent-skills/docker

$npx -y skills add mjunaidca/mjs-agent-skills --skill docker

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# Docker
2
3	Production-grade Docker containerization with security-first defaults.
4
5	---
6
7	## Resource Detection & Adaptation
8
9	Before generating Dockerfiles/Compose, detect the environment:
10
11	```bash
12	# Detect host machine memory
13	sysctl -n hw.memsize 2>/dev/null \| awk '{print $0/1024/1024/1024 " GB"}' \|\| \
14	grep MemTotal /proc/meminfo \| awk '{print $2/1024/1024 " GB"}'
15
16	# Detect Docker allocated resources
17	docker info --format 'Memory: {{.MemTotal}}, CPUs: {{.NCPU}}'
18
19	# Detect available disk space
20	docker system df
21	```
22
23	Adapt configurations based on detection:
24
25	\| Detected Docker Memory \| Profile \| Build Memory \| Container Limits \|
26	\|-----------------------\|---------\|--------------\|------------------\|
27	\| < 4GB \| Constrained \| 1GB \| 256Mi \|
28	\| 4-8GB \| Minimal \| 2GB \| 512Mi \|
29	\| 8-12GB \| Standard \| 4GB \| 1Gi \|
30	\| > 12GB \| Extended \| 8GB \| 2Gi \|
31
32	### Agent Behavior
33
34	1. Detect Docker resources before generating compose.yaml
35	2. Adapt resource limits to available memory
36	3. Warn if build may fail due to insufficient resources
37	4. Calculate safe limits: `docker_memory * 0.6 / container_count`
38
39	### Adaptive Compose Templates
40
41	Constrained (< 4GB Docker):
42	```yaml
43	services:
44	app:
45	deploy:
46	resources:
47	limits:
48	memory: 256M
49	cpus: '0.25'
50	build:
51	args:
52	- BUILDKIT_STEP_LOG_MAX_SIZE=10000000
53	```
54	⚠️ Agent should warn: "Docker memory low. Multi-stage builds may fail."
55
56	Standard (4-8GB Docker):
57	```yaml
58	services:
59	app:
60	deploy:
61	resources:
62	limits:
63	memory: 512M
64	cpus: '0.5'
65	reservations:
66	memory: 256M
67	```
68
69	Extended (> 8GB Docker):
70	```yaml
71	services:
72	app:
73	deploy:
74	resources:
75	limits:
76	memory: 1G
77	cpus: '1.0'
78	reservations:
79	memory: 512M
80	```
81
82	### Pre-Build Validation
83
84	Before running `docker build`, agent should verify:
85	```bash
86	# Check available memory
87	docker info --format '{{.MemTotal}}' \| awk '{if ($1 < 4000000000) print "WARNING: Low memory"}'
88	```
89
90	If constrained: use `--memory` flag and warn user about potential build failures.
91
92	---
93
94	## What This Skill Does
95
96	Analysis & Detection:
97	- Auto-detects runtime, framework, version, entrypoint (no questions)
98	- Scans .env files, classifies secrets vs build-args vs runtime config
99	- Detects native dependencies, generates correct build deps
100	- Identifies missing configs (Next.js standalone, health endpoints)
101
102	Generation:
103	- Creates multi-stage Dockerfiles customized to YOUR project structure
104	- Generates compose.yaml with security defaults (non-root, read-only, resource limits)
105	- Adds health endpoints if missing
106	- Fixes configuration issues (adds `output: 'standalone'` to Next.js, etc.)
107
108	Validation:
109	- Builds both dev and production targets before delivering
110	- Verifies health endpoints work
111	- Confirms non-root user in production
112	- Warns about any secrets that would leak into image
113	- Reports image size
114
115	Security:
116	- Never bakes secrets into images
117	- Non-root user by default
118	- Minimal attack surface (multi-stage builds)
119	- Pinned versions (no `:latest`)
120	- Security scan command included
121
122	## What This Skill Does NOT Do
123
124	- Generate Kubernetes manifests (use dedicated k8s skill)
125	- Create Helm charts (use dedicated helm skill)
126	- Handle Bun/Deno (use dedicated skills)
127	- Copy templates blindly without customization
128
129	---
130
131	## Before Implementation
132
133	Gather context to ensure successful implementation:
134
135	\| Source \| Gather \|
136	\|--------\|--------\|
137	\| Codebase \| Package files, existing Dockerfile, .env patterns \|
138	\| Conversation \| Dev vs production target, base image preferences \|
139	\| Skill References \| Framework patterns, multi-stage builds, security \|
140	\| User Guidelines \| Registry conventions, naming standards \|
141
142	---
143
144	## Required Clarifications
145
146	Ask when not auto-detectable:
147
148	\| Question \| When to Ask \|
149	\|----------\|-------------\|
150	\| Target environment \| "Building for development or production?" \|
151	\| Base image preference \| "Standard slim images or enterprise hardened?" \|
152	\| Existing Docker files \| "Enhance existing Dockerfile or create new?" \|
153	\| Registry target \| "Local only or pushing to registry?" \|
154
155	---
156
157	## Detect Runtime
158
159	\| File Present \| Runtime \| Package Manager \|
160	\|--------------\|---------\|-----------------\|
161	\| `requirements.txt`, `pyproject.toml`, `uv.lock` \| Python \| pip/uv \|
162	\| `pnpm-lock.yaml` \| Node.js \| pnpm \|
163	\| `yarn.lock` \| Node.js \| yarn \|
164	\| `package-lock.json` \| Node.js \| npm \|
165
166	-

People who liked this also viewed

6 picks

Type