Docker Entrypoint Generator
Generates entrypoint scripts for PHP Docker containers with signal handling, service readiness, and application bootstrap.
Generated Files
docker/
entrypoint.sh # Main web container entrypoint
entrypoint-worker.sh # Queue worker entrypoint
entrypoint-scheduler.sh # Cron scheduler entrypoint
wait-for-it.sh # Service readiness checker
Web Container Entrypoint (PHP-FPM)
#!/bin/bash
# entrypoint.sh — Web container entrypoint for PHP-FPM
set -eo pipefail
# ─── Signal Handling ────────────────────────────────────────
cleanup() {
echo "[entrypoint] Received shutdown signal, stopping gracefully..."
if [ -n "${FPM_PID}" ]; then
kill -SIGQUIT "${FPM_PID}" 2>/dev/null || true
wait "${FPM_PID}" 2>/dev/null || true
fi
echo "[entrypoint] Shutdown complete"
exit 0
}
trap cleanup SIGTERM SIGQUIT SIGINT
# ─── Environment Validation ────────────────────────────────
validate_env() {
local required_vars=("APP_ENV" "DATABASE_URL")
local missing=()
for var in "${required_vars[@]}"; do
if [ -z "${!var}" ]; then
missing+=("${var}")
fi
done
if [ ${#missing[@]} -gt 0 ]; then
echo "[entrypoint] ERROR: Missing required environment variables: ${missing[*]}"
exit 1
fi
echo "[entrypoint] Environment: ${APP_ENV}"
}
# ─── Wait for Dependencies ─────────────────────────────────
wait_for_services() {
if [ -n "${DB_HOST}" ] && [ -n "${DB_PORT}" ]; then
echo "[entrypoint] Waiting for database at ${DB_HOST}:${DB_PORT}..."
/usr/local/bin/wait-for-it.sh "${DB_HOST}:${DB_PORT}" --timeout=60 --strict
fi
if [ -n "${REDIS_HOST}" ] && [ -n "${REDIS_PORT}" ]; then
echo "[entrypoint] Waiting for Redis at ${REDIS_HOST}:${REDIS_PORT}..."
/usr/local/bin/wait-for-it.sh "${REDIS_HOST}:${REDIS_PORT}" --timeout=30 --strict
fi
if [ -n "${RABBITMQ_HOST}" ] && [ -n "${RABBITMQ_PORT}" ]; then
echo "[entrypoint] Waiting for RabbitMQ at ${RABBITMQ_HOST}:${RABBITMQ_PORT}..."
/usr/local/bin/wait-for-it.sh "${RABBITMQ_HOST}:${RABBITMQ_PORT}" --timeout=60 --strict
fi
}
# ─── Database Migrations ───────────────────────────────────
run_migrations() {
if [ "${RUN_MIGRATIONS:-false}" = "true" ]; then
echo "[entrypoint] Running database migrations..."
# Framework-specific command (see references/entrypoint-patterns.md)
php bin/console doctrine:migrations:migrate --no-interaction --allow-no-migration 2>&1 || {
echo "[entrypoint] ERROR: Migration failed"
exit 1
}
echo "[entrypoint] Migrations complete"
fi
}
# ─── Cache Warmup ──────────────────────────────────────────
warmup_cache() {
if [ "${APP_ENV}" = "prod" ]; then
echo "[entrypoint] Warming up cache..."
# Framework-specific command (see references/entrypoint-patterns.md)
php bin/console cache:warmup --env=prod --no-debug 2>&1 || {
echo "[entrypoint] WARNING: Cache warmup failed, continuing..."
}
echo "[entrypoint] Cache warmup complete"
fi
}
# ─── Fix Permissions ───────────────────────────────────────
fix_permissions() {
if [ -d "var" ]; then
chown -R www-data:www-data var/ 2>/dev/null || true
fi
if [ -d "storage" ]; then
chown -R www-data:www-data storage/ 2>/dev/null || true
fi
}
# ─── Main Execution ────────────────────────────────────────
echo "[entrypoint] Starting PHP-FPM container..."
validate_env
wait_for_services
fix_permissions
run_migrations
warmup_cache
echo "[entrypoint] Launching PHP-FPM..."
exec php-fpm --nodaemonize &
FPM_PID=$!
wait "${FPM_PID}"
Worker Container Entrypoint (Queue Consumer)
#!/bin/bash
# entrypoint-worker.sh — Queue worker entrypoint
set -eo pipefail
WORKER_PID=""
cleanup() {
echo "[worker] Received shutdown signal, draining worker..."
if [ -n "${WORKER_PID}" ]; then
kill -SIGTERM "${WORKER_PID}" 2>/dev/null || true
wait "${WORKER_PID}" 2>/dev/null || true
fi
echo "[worker] Worker stopped gracefully"
exit 0
}
trap cleanup SIGTERM SIGQUIT SIGINT
# Wait for dependencies
if [ -n "${DB_HOST}" ] && [ -n "${DB_PORT}" ]; then
/usr/local/bin/wait-for-it.sh "${DB_HOST}:${DB_PORT}" --timeout=60 --strict
fi
if [ -n "${RABBITMQ_HOST}" ] && [ -n "${RABBITMQ_PORT}" ]; then
/usr/local/bin/wait-for-it.sh "${RABBITMQ_HOST}:${RABBITMQ_PORT}" --timeout=60 --strict
fi
echo "[worker] Starting queue worker..."
WORKER_MEMORY_LIMIT="${WORKER_MEMORY_LIMIT:-128}"
WORKER_TIMEOUT="${WORKER_TIMEOUT:-60}"
WORKER_TRIES="${WORKER_TRIES:-3}"
WORKER_SLEEP="${WORKER_SLEEP:-3}"
# Framework-specific command (see references/entrypoint-patterns.md)
exec php bin/console messenger:consume async \
--memory-limit="${WORKER_MEMORY_LIMIT}M" \
--time-limit=3600 \
--limit=1000 \
-vv &
WORKER_PID=$!
wait "${WORKER_PID}"
Scheduler Container Entrypoint (Cron)
#!/bin/bash
# entrypoint-scheduler.sh — Cron scheduler entrypoint
set -eo pipefail
cleanup() {
echo "[scheduler] Shutting down cron..."
if [ -n "${CRON_PID}" ]; then
kill -SIGTERM "${CRON_PID}" 2>/dev/null || true
fi
exit 0
}
trap cleanup SIGTERM SIGQUIT SIGINT
# Wait for dependencies
if [ -n "${DB_HOST}" ] && [ -n "${DB_PORT}" ]; then
/usr/local/bin/wait-for-it.sh "${DB_HOST}:${DB_PORT}" --timeout=60 --strict
fi
# Install crontab
echo "[scheduler] Installing crontab..."
CRON_SCHEDULE="${CRON_SCHEDULE:-* * * * *}"
# Framework-specific (see references/entrypoint-patterns.md)
echo "${CRON_SCHEDULE} cd /app && php bin/console app:scheduler:run >> /var/log/cron.log 2>&1" \
| crontab -
# Start cron in foreground
echo "[scheduler] Starting cron daemon..."
exec crond -f -l 2 &
CRON_PID=$!
wait "${CRON_PID}"
Wait-for-it Script
#!/bin/bash
# wait-for-it.sh — Waits for a TCP host:port to become available
set -eo pipefail
TIMEOUT=30
STRICT=0
HOST=""
PORT=""
usage() {
echo "Usage: wait-for-it.sh host:port [--timeout=N] [--strict]"
exit 1
}
for arg in "$@"; do
case "${arg}" in
*:*)
HOST="${arg%%:*}"
PORT="${arg##*:}"
;;
--timeout=*)
TIMEOUT="${arg#*=}"
;;
--strict)
STRICT=1
;;
esac
done
[ -z "${HOST}" ] || [ -z "${PORT}" ] && usage
echo "Waiting for ${HOST}:${PORT} (timeout: ${TIMEOUT}s)..."
START_TIME=$(date +%s)
while ! nc -z "${HOST}" "${PORT}" 2>/dev/null; do
ELAPSED=$(( $(date +%s) - START_TIME ))
if [ "${ELAPSED}" -ge "${TIMEOUT}" ]; then
echo "ERROR: Timeout waiting for ${HOST}:${PORT} after ${TIMEOUT}s"
[ "${STRICT}" -eq 1 ] && exit 1
break
fi
sleep 1
done
echo "${HOST}:${PORT} is available"
exit 0
Dockerfile Integration
# Copy entrypoint scripts
COPY docker/entrypoint.sh /usr/local/bin/entrypoint.sh
COPY docker/entrypoint-worker.sh /usr/local/bin/entrypoint-worker.sh
COPY docker/entrypoint-scheduler.sh /usr/local/bin/entrypoint-scheduler.sh
COPY docker/wait-for-it.sh /usr/local/bin/wait-for-it.sh
RUN chmod +x /usr/local/bin/entrypoint.sh \
/usr/local/bin/entrypoint-worker.sh \
/usr/local/bin/entrypoint-scheduler.sh \
/usr/local/bin/wait-for-it.sh
# Install netcat for wait-for-it
RUN apk add --no-cache netcat-openbsd
ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
CMD ["php-fpm"]
Docker Compose Service Definitions
services:
web:
build: .
entrypoint: /usr/local/bin/entrypoint.sh
environment:
RUN_MIGRATIONS: "true"
worker:
build: .
entrypoint: /usr/local/bin/entrypoint-worker.sh
deploy:
replicas: 2
scheduler:
build: .
entrypoint: /usr/local/bin/entrypoint-scheduler.sh
Generation Instructions
- Identify container roles: web (PHP-FPM), worker (queue), scheduler (cron)
- Detect framework: Symfony or Laravel for correct CLI commands
- List dependencies: database, cache, message broker
- Generate entrypoint scripts with signal handling and readiness checks
- Add Dockerfile COPY/RUN for entrypoint installation
See references/entrypoint-patterns.md for Symfony and Laravel specifics.
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