zero downtime deploy

    1

    Automate blue-green, rolling, and canary deployments with atomic symlinks, Nginx swaps, and health-check rollbacks.

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    Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+22 more

    zero downtime deploy

    Example session with this skill installed

    I need a bash script for my Node.js app that performs a blue-green swap using Nginx upstreams. It should health check the target port before switching and offer a rollback command.

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    • Compiled the zero downtime deploy

    This script manages an atomic upstream swap for Nginx by verifying the target application is responsive before updating the active configuration.

    Blue-Green Deployment Script

    #!/bin/bash

# Blue-Green upstream swap for Nginx
set -euo pipefail

TARGET=${1:-}
ACTIVE_CONF="/etc/nginx/active_upstream.conf"
HEALTH_CHECK_TIMEOUT=30

log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*"; }

# Determine current and target
current=$(grep -oP 'http://\K[a-z]+' "$ACTIVE_CONF" 2>/dev/null || echo "blue")
if [[ -z "$TARGET" ]]; then
    TARGET=$([ "$current" = "blue" ] && echo "green" || echo "blue")
fi

TARGET_PORT=$([ "$TARGET" = "blue" ] && echo "3000" || echo "3001")

log "Health checking $TARGET on port $TARGET_PORT..."
deadline=$((SECONDS + HEALTH_CHECK_TIMEOUT))
while [[ $SECONDS -lt $deadline ]]; do
    if curl -fsS --max-time 3 "http://127.0.0.1:${TARGET_PORT}/health" > /dev/null 2>&1; then
        log "$TARGET is healthy"
        break
    fi
    sleep 2
done

if ! curl -fsS --max-time 3 "http://127.0.0.1:${TARGET_PORT}/health" > /dev/null 2>&1; then
    log "ERROR: Health check failed. Aborting swap."
    exit 1
fi

# Atomic swap
TMP_CONF=$(mktemp)
echo "proxy_pass http://${TARGET};" > "$TMP_CONF"
sudo mv "$TMP_CONF" "$ACTIVE_CONF"
sudo nginx -s reload

log "Switched to $TARGET. To rollback: $0 $current"

    Next steps

    1. Ensure /etc/nginx/sites-enabled/ includes active_upstream.conf in its location block.
    2. Grant the deploy user NOPASSWD sudo rights for nginx -s reload.
    3. Test the script in a staging environment by simulating a failed health check.

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    About this skill

    The problem

    Standard deployments cause service interruptions, broken connections, or data corruption during transitions. Manual SSH updates are error-prone, lack rollback mechanisms, and often fail to validate application health before exposing new code to users.

    What it does

    • Generates Nginx upstream configurations for blue-green and canary traffic splitting.
    • Authors Bash scripts for atomic release management using Capistrano-style symlink swaps.
    • Builds GitHub Actions workflows for SSH-based deployment with health check polling.
    • Designs safe database migration strategies using the expand/contract pattern.
    • Creates automated rollback runbooks to restore service in under 30 seconds.

    Frameworks & tools

    Nginx, GitHub Actions, Systemd, Rsync, Bash, SSH, and any backend capable of health check endpoints (Node.js, Python, Go, etc.).

    Why this beats prompting it yourself

    General LLMs often overlook the race conditions inherent in symlink swaps or the necessity of CREATE INDEX CONCURRENTLY in Postgres. This skill provides production-hardened scripts that include atomic file moves, pre-swap health validation, and automated cleanup of old releases.

    Use cases

    • Implementing zero-downtime blue-green environments on VPS or bare metal.
    • Gradually rolling out features to 10% of users via canary traffic splitting.
    • Setting up CI/CD pipelines that automatically roll back on failed health checks.
    • Planning non-breaking database schema changes for high-traffic apps.

    Known limitations

    Does not support Kubernetes-native objects like Argo Rollouts or cloud-managed services like AWS CodeDeploy. Frontend CDN cache invalidation is out of scope.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
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      Download the ZIP

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    2. 2

      Unzip into your skills folder

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    3. 3

      Ask your agent to use it

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    Security scanned

    Verified clean 12 days ago

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    Listed12 days ago

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