Add shared httpd + PHP-FPM-only container architecture

Separate Apache and PHP-FPM into distinct container roles to reduce per-customer memory overhead on shared servers. Adds three new images: - Dockerfile.fpm: PHP-FPM only (no Apache), listens on TCP port 9000 - Dockerfile.shared-httpd: Apache only (no PHP), with SSL and proxy_fcgi - Existing Dockerfile unchanged for standalone mode Key changes: - detect-memory.sh: CONTAINER_ROLE env var (combined/fpm_only/httpd_only) controls the memory budget split - create-php-config.sh: FPM_LISTEN env var for TCP port vs Unix socket, added /fpm-ping and /fpm-status health endpoints - New entrypoints for each container role - tune-mpm.sh for hot-adjusting Apache MPM settings - shared-vhost-template.tpl with proxy_fcgi and SSL on port 443 - CI/CD builds all three image types in parallel Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-01 10:08:00 -07:00
parent 87c4f2befc
commit c78167871c
9 changed files with 510 additions and 55 deletions
--- a/.gitea/workflows/build-push.yaml
+++ b/.gitea/workflows/build-push.yaml
@@ -38,3 +38,65 @@ jobs:
          tags: |
            repo.anhonesthost.net/cloud-hosting-platform/cac:php${{ matrix.phpver }}
            ${{ matrix.phpver == '85' && 'repo.anhonesthost.net/cloud-hosting-platform/cac:latest' || '' }}
+
+  Build-FPM-Images:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        phpver: [74, 80, 81, 82, 83, 84, 85]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea
+        uses: docker/login-action@v3
+        with:
+          registry: repo.anhonesthost.net
+          username: ${{ secrets.CI_USER }}
+          password: ${{ secrets.CI_TOKEN }}
+
+      - name: Build and Push FPM Image
+        uses: docker/build-push-action@v6
+        with:
+          file: ./Dockerfile.fpm
+          platforms: linux/amd64
+          push: true
+          build-args: |
+            PHPVER=${{ matrix.phpver }}
+          tags: |
+            repo.anhonesthost.net/cloud-hosting-platform/cac-fpm:php${{ matrix.phpver }}
+            ${{ matrix.phpver == '85' && 'repo.anhonesthost.net/cloud-hosting-platform/cac-fpm:latest' || '' }}
+
+  Build-Shared-httpd:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea
+        uses: docker/login-action@v3
+        with:
+          registry: repo.anhonesthost.net
+          username: ${{ secrets.CI_USER }}
+          password: ${{ secrets.CI_TOKEN }}
+
+      - name: Build and Push Shared httpd Image
+        uses: docker/build-push-action@v6
+        with:
+          file: ./Dockerfile.shared-httpd
+          platforms: linux/amd64
+          push: true
+          tags: |
+            repo.anhonesthost.net/cloud-hosting-platform/shared-httpd:latest
--- a/Dockerfile.fpm
+++ b/Dockerfile.fpm
@@ -0,0 +1,43 @@
+FROM almalinux/9-base
+ARG PHPVER=83
+
+# Install repos, update, install only needed packages (no httpd/mod_ssl), clean up in one layer
+RUN dnf install -y \
+      https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm \
+      https://rpms.remirepo.net/enterprise/remi-release-9.rpm && \
+    dnf update -y && \
+    dnf install -y wget procps cronie iproute postgresql-devel microdnf less git \
+      nano rsync unzip zip mariadb bind-utils jq patch nc tree dos2unix fcgi && \
+    dnf clean all && \
+    rm -rf /var/cache/dnf /usr/share/doc /usr/share/man /usr/share/locale/*
+
+# Copy scripts into the image and set permissions
+COPY ./scripts/ /scripts/
+RUN chmod +x /scripts/*
+
+# Create needed dirs, install PHP, clean up (no SSL cert, no httpd)
+RUN mkdir -p /run/php-fpm/ && \
+    /scripts/install-php$PHPVER.sh && \
+    rm -rf /tmp/*
+
+# Download and install wp-cli
+RUN curl -L -o /usr/local/bin/wp https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar && \
+    chmod +x /usr/local/bin/wp
+
+# Download and install Composer
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer && \
+    chmod +x /usr/local/bin/composer
+
+# Copy configs (PHP only, no Apache configs)
+COPY ./configs/prod-php.ini /etc/php.ini
+COPY ./configs/mariadb.repo /etc/yum.repos.d/
+
+# Set up cron job for log rotation
+RUN echo "15 */12 * * * root /scripts/log-rotate.sh" >> /etc/crontab
+
+EXPOSE 9000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \
+  CMD SCRIPT_FILENAME=/fpm-ping SCRIPT_NAME=/fpm-ping REQUEST_METHOD=GET cgi-fcgi -bind -connect 127.0.0.1:9000 | grep -q pong || exit 1
+
+ENTRYPOINT [ "/scripts/entrypoint-fpm.sh" ]
--- a/Dockerfile.shared-httpd
+++ b/Dockerfile.shared-httpd
@@ -0,0 +1,40 @@
+FROM almalinux/9-base
+
+# Install Apache and minimal dependencies (no PHP at all)
+RUN dnf install -y \
+      https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
+    dnf update -y && \
+    dnf install -y httpd mod_ssl iproute cronie procps curl && \
+    dnf clean all && \
+    rm -rf /var/cache/dnf /usr/share/doc /usr/share/man /usr/share/locale/*
+
+# Copy scripts and set permissions
+COPY ./scripts/detect-memory.sh /scripts/detect-memory.sh
+COPY ./scripts/create-apache-mpm-config.sh /scripts/create-apache-mpm-config.sh
+COPY ./scripts/log-rotate.sh /scripts/log-rotate.sh
+COPY ./scripts/entrypoint-shared-httpd.sh /scripts/entrypoint-shared-httpd.sh
+COPY ./scripts/tune-mpm.sh /scripts/tune-mpm.sh
+RUN chmod +x /scripts/*
+
+# Generate self-signed SSL cert (same as main CAC image)
+RUN openssl req -newkey rsa:2048 -nodes \
+      -keyout /etc/pki/tls/private/localhost.key \
+      -x509 -days 3650 -subj "/CN=localhost" \
+      -out /etc/pki/tls/certs/localhost.crt
+
+# Copy Apache configs
+COPY ./configs/remote_ip.conf /etc/httpd/conf.d/
+COPY ./configs/default-index.conf /etc/httpd/conf.d/
+
+# Create vhosts directory (will be volume-mounted from host)
+RUN mkdir -p /etc/httpd/conf.d/vhosts
+
+# Set up cron job for log rotation
+RUN echo "15 */12 * * * root /scripts/log-rotate.sh" >> /etc/crontab
+
+EXPOSE 80 443
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \
+  CMD curl -sfk https://localhost/ping || exit 1
+
+ENTRYPOINT [ "/scripts/entrypoint-shared-httpd.sh" ]
--- a/configs/shared-vhost-template.tpl
+++ b/configs/shared-vhost-template.tpl
@@ -0,0 +1,39 @@
+<Directory "/mnt/users/~~user~~/~~domain~~">
+    AllowOverride None
+    Require all granted
+</Directory>
+
+<Directory "/mnt/users/~~user~~/~~domain~~/public_html">
+    Options All MultiViews
+    AllowOverride All
+    Require all granted
+</Directory>
+
+<VirtualHost *:80>
+    ServerName "~~domain~~"
+    ~~alias_block~~
+    DocumentRoot "/mnt/users/~~user~~/~~domain~~/public_html"
+    RewriteEngine on
+    RewriteCond %{SERVER_NAME} =~~domain~~
+    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
+</VirtualHost>
+
+<IfModule mod_ssl.c>
+  <VirtualHost *:443>
+    ServerName "~~domain~~"
+    ~~alias_block~~
+    DocumentRoot "/mnt/users/~~user~~/~~domain~~/public_html"
+
+    SSLCertificateFile /etc/pki/tls/certs/localhost.crt
+    SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
+
+    <FilesMatch \.php$>
+        SetHandler "proxy:fcgi://~~fpm_host~~:~~fpm_port~~"
+    </FilesMatch>
+
+    DirectoryIndex index.php index.html index.htm
+
+    ErrorLog "/var/log/httpd/~~domain~~-error.log"
+    CustomLog "/var/log/httpd/~~domain~~-access.log" combined
+  </VirtualHost>
+</IfModule>
--- a/scripts/create-php-config.sh
+++ b/scripts/create-php-config.sh
@@ -2,15 +2,28 @@

 rm /etc/php-fpm.d/www.conf

+FPM_LISTEN=${FPM_LISTEN:-/run/php-fpm/www.sock}
+
+# Determine listen directive and ownership based on socket vs TCP
+if echo "$FPM_LISTEN" | grep -q '/'; then
+  # Unix socket mode
+  listen_directive="$FPM_LISTEN"
+  listen_owner_block="listen.owner = apache
+listen.group = apache"
+else
+  # TCP port mode
+  listen_directive="0.0.0.0:${FPM_LISTEN}"
+  listen_owner_block=""
+fi
+
 cat <<EOF > /etc/php-fpm.d/$user.conf

 [$user]

 user = $user
 group = $user
-listen = /run/php-fpm/www.sock
-listen.owner = apache
-listen.group = apache
+listen = ${listen_directive}
+${listen_owner_block}

 pm = ${PHP_FPM_PM}
 pm.max_children = ${PHP_FPM_MAX_CHILDREN}
@@ -22,7 +35,12 @@ pm.start_servers = ${PHP_FPM_START_SERVERS}
 pm.min_spare_servers = ${PHP_FPM_MIN_SPARE}
 pm.max_spare_servers = ${PHP_FPM_MAX_SPARE}

-slowlog = /etc/httpd/logs/error_log
+; Health check endpoints
+ping.path = /fpm-ping
+ping.response = pong
+pm.status_path = /fpm-status
+
+slowlog = /home/$user/logs/php-fpm/slowlog
 request_slowlog_timeout = 3s

 php_admin_value[error_log] = /home/$user/logs/php-fpm/error.log
--- a/scripts/detect-memory.sh
+++ b/scripts/detect-memory.sh
@@ -38,6 +38,8 @@ fi
 CONTAINER_MEMORY_MB=$((CONTAINER_MEMORY_BYTES / 1024 / 1024))

 # --- Budget calculation ---
+CONTAINER_ROLE=${CONTAINER_ROLE:-combined}  # combined | fpm_only | httpd_only
+
 OS_RESERVE_MB=50
 FIXED_PROCESS_MB=50
 DEV_OVERHEAD_MB=0
@@ -50,10 +52,23 @@ if [ "$AVAILABLE_MB" -lt 60 ]; then
  AVAILABLE_MB=60
 fi

+case "$CONTAINER_ROLE" in
+  fpm_only)
+    PHP_BUDGET_MB=$AVAILABLE_MB
+    APACHE_BUDGET_MB=0
+    ;;
+  httpd_only)
+    PHP_BUDGET_MB=0
+    APACHE_BUDGET_MB=$AVAILABLE_MB
+    ;;
+  *)
    PHP_BUDGET_MB=$((AVAILABLE_MB * 80 / 100))
    APACHE_BUDGET_MB=$((AVAILABLE_MB * 20 / 100))
+    ;;
+esac

-# --- PHP-FPM parameters ---
+# --- PHP-FPM parameters (skipped for httpd_only) ---
+if [ "$CONTAINER_ROLE" != "httpd_only" ]; then
  PHP_WORKER_ESTIMATE_MB=${PHP_WORKER_ESTIMATE_MB:-60}

  calc_max_children=$((PHP_BUDGET_MB / PHP_WORKER_ESTIMATE_MB))
@@ -74,8 +89,10 @@ PHP_FPM_MAX_REQUESTS=${FPM_MAX_REQUESTS:-500}
  PHP_FPM_START_SERVERS=${FPM_START_SERVERS:-2}
  PHP_FPM_MIN_SPARE=${FPM_MIN_SPARE_SERVERS:-1}
  PHP_FPM_MAX_SPARE=${FPM_MAX_SPARE_SERVERS:-3}
+fi

-# --- Apache MPM parameters ---
+# --- Apache MPM parameters (skipped for fpm_only) ---
+if [ "$CONTAINER_ROLE" != "fpm_only" ]; then
  # ServerLimit: roughly 1 process per ~25 workers, floor 2, cap 16
  calc_server_limit=$((APACHE_BUDGET_MB / 30))
  if [ "$calc_server_limit" -lt 2 ]; then
@@ -103,10 +120,15 @@ APACHE_MAX_REQUEST_WORKERS=${APACHE_MAX_REQUEST_WORKERS:-$calc_max_request_worke
  APACHE_MIN_SPARE_THREADS=${APACHE_MIN_SPARE_THREADS:-5}
  APACHE_MAX_SPARE_THREADS=${APACHE_MAX_SPARE_THREADS:-15}
  APACHE_MAX_CONNECTIONS_PER_CHILD=${APACHE_MAX_CONNECTIONS_PER_CHILD:-3000}
+fi

 # --- Export all variables ---
-export CONTAINER_MEMORY_MB
+export CONTAINER_ROLE CONTAINER_MEMORY_MB
+if [ "$CONTAINER_ROLE" != "httpd_only" ]; then
  export PHP_FPM_PM PHP_FPM_MAX_CHILDREN PHP_FPM_PROCESS_IDLE_TIMEOUT PHP_FPM_MAX_REQUESTS
  export PHP_FPM_START_SERVERS PHP_FPM_MIN_SPARE PHP_FPM_MAX_SPARE
+fi
+if [ "$CONTAINER_ROLE" != "fpm_only" ]; then
  export APACHE_START_SERVERS APACHE_SERVER_LIMIT APACHE_MAX_REQUEST_WORKERS
  export APACHE_MIN_SPARE_THREADS APACHE_MAX_SPARE_THREADS APACHE_MAX_CONNECTIONS_PER_CHILD
+fi
--- a/scripts/entrypoint-fpm.sh
+++ b/scripts/entrypoint-fpm.sh
@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+
+if [ -z "$PHPVER" ]; then
+  PHPVER="83";
+fi
+
+if [ -z "$environment" ]; then
+  environment="PROD"
+fi
+
+# Default to FPM-only role
+export CONTAINER_ROLE="fpm_only"
+export FPM_LISTEN=${FPM_LISTEN:-9000}
+
+adduser -u $uid $user
+
+mkdir -p /home/$user/public_html
+mkdir -p /home/$user/logs/php-fpm
+
+ln -sf /home/$user/logs/php-fpm /var/log/php-fpm
+
+source /scripts/detect-memory.sh
+echo "Container memory: ${CONTAINER_MEMORY_MB}MB | PHP-FPM pm=${PHP_FPM_PM} max_children=${PHP_FPM_MAX_CHILDREN} | Listen=${FPM_LISTEN}"
+
+/scripts/create-php-config.sh
+
+mkdir -p /run/php-fpm/
+/usr/sbin/php-fpm -y /etc/php-fpm.conf
+chown -R $user:$user /home/$user
+chmod -R 755 /home/$user
+
+if [[ $environment == 'DEV' ]]; then
+  echo "Starting Dev Deployment (FPM-only mode)"
+  mkdir -p /home/$user/_db_backups
+  if ! command -v microdnf &> /dev/null; then
+    echo "microdnf not found, installing with dnf..."
+    dnf install -y microdnf && dnf clean all
+  fi
+  microdnf install -y MariaDB-server MariaDB-client memcached
+  sed -r -i 's/session.save_path="memcache:11211/session.save_path="localhost:11211/' /etc/php.ini
+  nohup mysqld -umysql &
+  if [ ! -f /home/$user/mysql_creds ]; then
+    echo "Give MySQL a chance to finish starting..."
+    sleep 10
+    mysql_user=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 13 ; echo '')
+    mysql_password=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 18 ; echo '')
+    mysql_db=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 6 ; echo '')
+    mysql -e "CREATE DATABASE devdb_"$mysql_db";"
+    mysql -e "CREATE USER '"$mysql_user"'@'localhost' IDENTIFIED BY '"$mysql_password"';"
+    mysql -e "GRANT ALL PRIVILEGES ON *.* TO '"$mysql_user"'@'localhost' WITH GRANT OPTION;"
+    mysql -e "FLUSH PRIVILEGES;"
+    echo "# User crontab for $user" > /home/$user/crontab
+    echo "*/15 * * * * /scripts/mysql-backup.sh $user devdb_$mysql_db" >> /home/$user/crontab
+    chown $user:$user /home/$user/crontab
+    echo "MySQL User: "$mysql_user > /home/$user/mysql_creds
+    echo "MySQL Password: "$mysql_password >> /home/$user/mysql_creds
+    echo "MySQL Database: devdb_"$mysql_db >> /home/$user/mysql_creds
+    cat /home/$user/mysql_creds
+  fi
+  /usr/bin/memcached -d -u $user
+fi
+
+if [[ $environment == 'PROD' ]]; then
+    if [ -f /etc/php.d/50-memcached.ini ]; then
+        sed -r -i 's/;session.save_path="localhost:11211/session.save_path="memcache:11211/' /etc/php.d/50-memcached.ini
+    fi
+fi
+
+# Set up user crontab
+if [ ! -f /home/$user/crontab ]; then
+    echo "# User crontab for $user" > /home/$user/crontab
+    echo "# Add your cron jobs here" >> /home/$user/crontab
+    echo "# Example: */5 * * * * /home/$user/scripts/my-script.sh" >> /home/$user/crontab
+    chown $user:$user /home/$user/crontab
+fi
+
+# Load user crontab
+crontab -u $user /home/$user/crontab
+
+/usr/sbin/crond
+
+# Tail PHP-FPM logs (becomes PID 1 process)
+touch /home/$user/logs/php-fpm/error.log
+tail -f /home/$user/logs/php-fpm/*
+
+exit 0
--- a/scripts/entrypoint-shared-httpd.sh
+++ b/scripts/entrypoint-shared-httpd.sh
@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+export CONTAINER_ROLE="httpd_only"
+
+if [ -z "$environment" ]; then
+  environment="PROD"
+fi
+
+# Generate self-signed SSL cert if not already present
+if [ ! -f /etc/pki/tls/certs/localhost.crt ]; then
+  openssl req -newkey rsa:2048 -nodes \
+    -keyout /etc/pki/tls/private/localhost.key \
+    -x509 -days 3650 -subj "/CN=localhost" \
+    -out /etc/pki/tls/certs/localhost.crt
+fi
+
+# Create log directory
+mkdir -p /var/log/httpd
+
+# Remove default configs that conflict
+rm -f /etc/httpd/conf.d/userdir.conf
+
+# Configure RemoteIP for Docker network
+docker_network=$(ip addr show | grep eth0 | grep inet | awk -F " " '{print $2}')
+if [ -n "$docker_network" ]; then
+  echo "RemoteIPInternalProxy $docker_network" >> /etc/httpd/conf.d/remoteip.conf
+fi
+
+# Detect memory and calculate Apache MPM tuning
+source /scripts/detect-memory.sh
+echo "Container memory: ${CONTAINER_MEMORY_MB}MB | Apache workers=${APACHE_MAX_REQUEST_WORKERS} | Role=${CONTAINER_ROLE}"
+
+# Generate MPM tuning config
+/scripts/create-apache-mpm-config.sh
+
+# Write SSL global config (matches standalone CAC behavior)
+cat <<'EOF' > /etc/httpd/conf.d/ssl-global.conf
+Listen 443 https
+SSLPassPhraseDialog exec:/usr/libexec/httpd-ssl-pass-dialog
+SSLSessionCache         shmcb:/run/httpd/sslcache(512000)
+SSLSessionCacheTimeout  300
+SSLCryptoDevice builtin
+EOF
+
+# Disable the default ssl.conf if present (we use per-vhost SSL)
+if [ -f /etc/httpd/conf.d/ssl.conf ]; then
+  mv /etc/httpd/conf.d/ssl.conf /etc/httpd/conf.d/ssl.conf.bak
+fi
+
+# Ensure vhosts directory exists and is included
+mkdir -p /etc/httpd/conf.d/vhosts
+if ! grep -q 'IncludeOptional conf.d/vhosts/' /etc/httpd/conf/httpd.conf; then
+  echo 'IncludeOptional conf.d/vhosts/*.conf' >> /etc/httpd/conf/httpd.conf
+fi
+
+# Start Apache
+/usr/sbin/httpd -k start
+
+# Start cron for log rotation
+/usr/sbin/crond
+
+# Tail Apache logs (becomes PID 1 process)
+touch /var/log/httpd/error_log
+tail -f /var/log/httpd/*
+
+exit 0
--- a/scripts/tune-mpm.sh
+++ b/scripts/tune-mpm.sh
@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+# Hot-adjust Apache MPM Event settings and graceful reload.
+# Usage: tune-mpm.sh [--max-workers N] [--server-limit N] [--start-servers N]
+#                     [--min-spare-threads N] [--max-spare-threads N]
+#                     [--max-connections-per-child N]
+
+set -euo pipefail
+
+# Read current values from the config as defaults
+CONFIG_FILE="/etc/httpd/conf.d/mpm-tuning.conf"
+
+if [ ! -f "$CONFIG_FILE" ]; then
+  echo "Error: $CONFIG_FILE not found. Run detect-memory.sh first."
+  exit 1
+fi
+
+# Parse current values from config
+current_start=$(grep -oP 'StartServers\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "1")
+current_min_spare=$(grep -oP 'MinSpareThreads\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "5")
+current_max_spare=$(grep -oP 'MaxSpareThreads\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "15")
+current_max_workers=$(grep -oP 'MaxRequestWorkers\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "50")
+current_server_limit=$(grep -oP 'ServerLimit\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "2")
+current_max_conn=$(grep -oP 'MaxConnectionsPerChild\s+\K\d+' "$CONFIG_FILE" 2>/dev/null || echo "3000")
+
+# Parse arguments
+START_SERVERS=$current_start
+MIN_SPARE_THREADS=$current_min_spare
+MAX_SPARE_THREADS=$current_max_spare
+MAX_REQUEST_WORKERS=$current_max_workers
+SERVER_LIMIT=$current_server_limit
+MAX_CONNECTIONS_PER_CHILD=$current_max_conn
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    --max-workers) MAX_REQUEST_WORKERS="$2"; shift 2 ;;
+    --server-limit) SERVER_LIMIT="$2"; shift 2 ;;
+    --start-servers) START_SERVERS="$2"; shift 2 ;;
+    --min-spare-threads) MIN_SPARE_THREADS="$2"; shift 2 ;;
+    --max-spare-threads) MAX_SPARE_THREADS="$2"; shift 2 ;;
+    --max-connections-per-child) MAX_CONNECTIONS_PER_CHILD="$2"; shift 2 ;;
+    --help|-h)
+      echo "Usage: $0 [--max-workers N] [--server-limit N] [--start-servers N]"
+      echo "          [--min-spare-threads N] [--max-spare-threads N]"
+      echo "          [--max-connections-per-child N]"
+      echo ""
+      echo "Current values:"
+      echo "  StartServers:           $current_start"
+      echo "  MinSpareThreads:        $current_min_spare"
+      echo "  MaxSpareThreads:        $current_max_spare"
+      echo "  MaxRequestWorkers:      $current_max_workers"
+      echo "  ServerLimit:            $current_server_limit"
+      echo "  MaxConnectionsPerChild: $current_max_conn"
+      exit 0
+      ;;
+    *) echo "Unknown option: $1"; exit 1 ;;
+  esac
+done
+
+# Write updated config
+cat <<EOF > "$CONFIG_FILE"
+<IfModule mpm_event_module>
+    StartServers            ${START_SERVERS}
+    MinSpareThreads         ${MIN_SPARE_THREADS}
+    MaxSpareThreads         ${MAX_SPARE_THREADS}
+    ThreadLimit             64
+    ThreadsPerChild         25
+    MaxRequestWorkers       ${MAX_REQUEST_WORKERS}
+    ServerLimit             ${SERVER_LIMIT}
+    MaxConnectionsPerChild  ${MAX_CONNECTIONS_PER_CHILD}
+</IfModule>
+EOF
+
+echo "MPM config updated:"
+echo "  StartServers=$START_SERVERS ServerLimit=$SERVER_LIMIT MaxRequestWorkers=$MAX_REQUEST_WORKERS"
+echo "  MinSpareThreads=$MIN_SPARE_THREADS MaxSpareThreads=$MAX_SPARE_THREADS MaxConnectionsPerChild=$MAX_CONNECTIONS_PER_CHILD"
+
+# Graceful reload
+/usr/sbin/httpd -k graceful
+echo "Apache graceful reload triggered."