docker-swarm
Docker Swarm orchestration, cluster management, and production deployments
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/pluginagentmarketplace/custom-plugin-docker --skill docker-swarm- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads docker-swarm automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Docker Swarm Skill
Master Docker Swarm for container orchestration, cluster management, and production deployments.
Purpose
Set up and manage Docker Swarm clusters for high availability, service scaling, and production orchestration.
Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| managers | number | No | 3 | Number of manager nodes |
| workers | number | No | - | Number of worker nodes |
| encrypted | boolean | No | true | Encrypt overlay networks |
Cluster Setup
Initialize Swarm
# Initialize on first manager
docker swarm init --advertise-addr <MANAGER_IP>
# Get join tokens
docker swarm join-token worker
docker swarm join-token manager
# Join as worker
docker swarm join --token <WORKER_TOKEN> <MANAGER_IP>:2377
# Join as manager
docker swarm join --token <MANAGER_TOKEN> <MANAGER_IP>:2377
High Availability (3 or 5 managers)
# Manager quorum: N/2 + 1
# 3 managers = tolerates 1 failure
# 5 managers = tolerates 2 failures
Service Deployment
Basic Service
# Create service
docker service create \
--name webapp \
--replicas 3 \
--publish 80:80 \
nginx:alpine
# Scale
docker service scale webapp=5
# Update image
docker service update --image nginx:1.25-alpine webapp
# Rollback
docker service rollback webapp
Full Service Configuration
docker service create \
--name api \
--replicas 3 \
--network backend \
--publish 8080:3000 \
--mount type=volume,source=data,target=/data \
--secret db_password \
--env NODE_ENV=production \
--limit-cpu 0.5 \
--limit-memory 512M \
--update-delay 10s \
--update-parallelism 1 \
--update-failure-action rollback \
--health-cmd "curl -f http://localhost:3000/health" \
--health-interval 30s \
myapp:latest
Stack Deployment
Production Stack
# stack.yaml
services:
frontend:
image: frontend:${VERSION:-latest}
deploy:
replicas: 3
placement:
constraints:
- node.role == worker
update_config:
parallelism: 1
delay: 10s
failure_action: rollback
resources:
limits:
cpus: '0.5'
memory: 256M
ports:
- "80:80"
networks:
- frontend
healthcheck:
test: ["CMD", "curl", "-f", "http://localhost/health"]
interval: 30s
backend:
image: backend:${VERSION:-latest}
deploy:
replicas: 3
secrets:
- db_password
networks:
- frontend
- backend
networks:
frontend:
driver: overlay
backend:
driver: overlay
internal: true
secrets:
db_password:
external: true
# Deploy stack
docker stack deploy -c stack.yaml myapp
# List services
docker stack services myapp
# Remove stack
docker stack rm myapp
Secrets & Configs
Secrets
# Create secret
echo "password" | docker secret create db_password -
# Use in service
docker service update --secret-add db_password myservice
# Rotate secret
echo "newpassword" | docker secret create db_password_v2 -
docker service update \
--secret-rm db_password \
--secret-add source=db_password_v2,target=db_password \
myservice
Configs
# Create config
docker config create nginx_config ./nginx.conf
# Use in service
docker service create \
--config source=nginx_config,target=/etc/nginx/nginx.conf \
nginx
Node Management
# List nodes
docker node ls
# Drain node (maintenance)
docker node update --availability drain <node>
# Activate node
docker node update --availability active <node>
# Add label
docker node update --label-add role=database <node>
# Promote to manager
docker node promote <node>
# Demote from manager
docker node demote <node>
Error Handling
Common Errors
| Error | Cause | Solution |
|---|---|---|
no suitable node | Constraints not met | Relax or add nodes |
not converging | Health check failing | Check service logs |
Raft: no leader | Quorum lost | Restore managers |
Manager Recovery
# If quorum lost, force new cluster
docker swarm init --force-new-cluster --advertise-addr <IP>
Troubleshooting
Debug Checklist
- Swarm active?
docker info | grep Swarm - Nodes healthy?
docker node ls - Service running?
docker service ls - Tasks placed?
docker service ps <svc>
Diagnostics
# Service status
docker service ls
# Task status
docker service ps <service> --no-trunc
# Service logs
docker service logs -f <service>
# Node issues
docker node inspect <node> --pretty
Usage
Skill("docker-swarm")
Assets
assets/swarm-stack.yaml- Stack templatescripts/swarm-init.sh- Init script
Related Skills
- docker-networking
- docker-security
- docker-production
FAQ
What does the docker-swarm skill do?
Docker Swarm orchestration, cluster management, and production deployments
How do I install docker-swarm?
Run npx skills add https://github.com/pluginagentmarketplace/custom-plugin-docker --skill docker-swarm in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/docker-swarm/ (personal) or .claude/skills/docker-swarm/ (project).
Which AI agents can use docker-swarm?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is docker-swarm safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains docker-swarm?
It is published by pluginagentmarketplace in pluginagentmarketplace/custom-plugin-docker. It has 66 recorded installs.
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