php-fpm: preinstall wp-cli, add WP-independent healthcheck

README.md

@@ -40,12 +40,25 @@ The CI workflow is configured to build with the repository root as the Docker bu
 
   - Or enable the entrypoint-based fixup in php-fpm by setting `CHOWN_ON_START=1` for the `php-fpm` service (the entrypoint is guarded — it only runs when this env is explicitly enabled).
 
-  ## Logging & debugging
+## Logging & debugging
 
-  - PHP-FPM streams master/worker logs plus PHP fatals to stderr, so `docker compose logs php-fpm` (or your platform equivalent) will always contain the messages you need for incident response.
-  - The auto-prepend bootstrap additionally installs shutdown/exception hooks that write uncaught throwables and fatal errors to stderr even if WordPress or a plugin tampers with `ini_set()`.
-  - When you need full stack traces in the browser, set `FORCE_DEBUG_ERRORS=1` on the `php-fpm` service. The bootstrap enables verbose output and emits a warning in the container logs reminding you to turn it back off (leaving it on in production leaks stack traces to clients).
-  - Remove or unset `FORCE_DEBUG_ERRORS` after troubleshooting so production responses stay clean.
+- PHP-FPM streams master/worker logs plus PHP fatals to stderr, so `docker compose logs php-fpm` (or your platform equivalent) will always contain the messages you need for incident response.
+- The auto-prepend bootstrap additionally installs shutdown/exception hooks that write uncaught throwables and fatal errors to stderr even if WordPress or a plugin tampers with `ini_set()`.
+- When you need full stack traces in the browser, set `FORCE_DEBUG_ERRORS=1` on the `php-fpm` service. The bootstrap enables verbose output and emits a warning in the container logs reminding you to turn it back off (leaving it on in production leaks stack traces to clients).
+- Remove or unset `FORCE_DEBUG_ERRORS` after troubleshooting so production responses stay clean.
+
+## Health checks
+
+- The nginx config exposes `/healthz`, which bypasses WordPress entirely and executes `/usr/local/share/auvem/health/healthcheck.php` inside PHP-FPM. The script verifies the `/var/www/html` mount and optionally performs a MySQL connection test when `WORDPRESS_DB_*` variables are present.
+- HTTP 200 means the platform (nginx ↔ php-fpm ↔ database) is healthy. Any filesystem or database failures return HTTP 503 with a short JSON payload detailing which probe failed. This lets you point uptime monitors at `/healthz` while still separately watching the public homepage for regressions caused by client code.
+- Example local probe: `curl -fsS http://localhost:8080/healthz | jq`.
+
+## WP-CLI baked in
+
+- The PHP-FPM image now ships with the official `wp` binary, so you can run administrative remediation tasks without installing extra tooling on target hosts.
+- Typical usage: `docker compose exec php-fpm wp --allow-root user update admin --user_pass='NewPassword123!' --skip-email --path=/var/www/html`.
+- The binary runs as root inside the container, so remember the `--allow-root` flag (or create an app-level user if you prefer tighter isolation).
+- Automation hooks (e.g., your client portal) can wrap `wp` commands for password resets, cron runs, plugin inspections, etc., provided they bind-mount the site into `/var/www/html`.
 
 ## Local Testing & Development
 

nginx/nginx.conf

@@ -42,6 +42,16 @@ server {
     location = /favicon.ico { access_log off; log_not_found off; }
     location = /robots.txt  { access_log off; log_not_found off; }
 
+    # Fleet readiness probe that bypasses WordPress and executes a bundled PHP script.
+    location = /healthz {
+        access_log off;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME /usr/local/share/auvem/health/healthcheck.php;
+        fastcgi_param SCRIPT_NAME /healthz;
+        fastcgi_param PATH_INFO "";
+        fastcgi_pass php-fpm:9000;
+    }
+
     # Main WordPress front-controller.
     # All non-file requests fall through to index.php.
     location / {

php-fpm/7.4/Dockerfile

@@ -27,6 +27,7 @@ RUN set -eux; \
 	# Install runtime dependencies
 	apk add --no-cache \
 	bash \
+	curl \
 	freetype \
 	libjpeg-turbo \
 	libpng \
@@ -67,6 +68,10 @@ RUN set -eux; \
 	# Use production php.ini
 	cp "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"; \
 	\
+	# Install WP-CLI for remedial administration
+	curl -fSL https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar -o /usr/local/bin/wp; \
+	chmod +x /usr/local/bin/wp; \
+	\
 	# Clean up build dependencies
 	apk del .build-deps; \
 	rm -rf /var/cache/apk/* /tmp/*
@@ -85,6 +90,10 @@ COPY php-fpm/conf.d/ /usr/local/etc/php/conf.d/
 # Copy the force-debug script (enablement is handled via conf.d/99-force-debug.ini)
 COPY --chown=app:app shared/php-fpm/force-debug.php /usr/local/etc/php/force-debug.php
 
+# Copy shared healthcheck assets
+RUN mkdir -p /usr/local/share/auvem/health
+COPY shared/php-fpm/healthcheck.php /usr/local/share/auvem/health/healthcheck.php
+
 # Copy pool configuration from this directory
 COPY --chown=app:app php-fpm/${BASE_VERSION}/www.conf /usr/local/etc/php-fpm.d/www.conf
 # Copy the global php-fpm configuration so logging defaults are predictable

shared/php-fpm/healthcheck.php

@@ -0,0 +1,94 @@
+<?php
+// healthcheck.php
+// Lightweight readiness probe independent of WordPress code.
+
+header('Content-Type: application/json');
+header('Cache-Control: no-store, no-cache, must-revalidate');
+
+$response = [
+    'status' => 'ok',
+    'php_version' => PHP_VERSION,
+    'checks' => [],
+];
+$httpStatus = 200;
+
+// Filesystem/webroot probe
+$webroot = '/var/www/html';
+$fsStatus = [
+    'name' => 'filesystem',
+    'status' => 'ok',
+    'detail' => 'Webroot mounted',
+];
+if (!is_dir($webroot)) {
+    $fsStatus['status'] = 'error';
+    $fsStatus['detail'] = 'Missing /var/www/html mount';
+    $httpStatus = 503;
+} elseif (!is_readable($webroot)) {
+    $fsStatus['status'] = 'error';
+    $fsStatus['detail'] = 'Webroot not readable';
+    $httpStatus = 503;
+}
+$response['checks'][] = $fsStatus;
+
+// Database probe (optional if env vars missing)
+$requiredEnv = ['WORDPRESS_DB_HOST', 'WORDPRESS_DB_USER', 'WORDPRESS_DB_PASSWORD', 'WORDPRESS_DB_NAME'];
+$dbConfig = [];
+$missingEnv = [];
+foreach ($requiredEnv as $var) {
+    $value = getenv($var);
+    if ($value === false || $value === '') {
+        $missingEnv[] = $var;
+    } else {
+        $dbConfig[$var] = $value;
+    }
+}
+
+$dbStatus = [
+    'name' => 'database',
+    'status' => 'skipped',
+    'detail' => 'Database env vars missing',
+];
+
+if (empty($missingEnv)) {
+    [$host, $port] = (function (string $rawHost): array {
+        if (preg_match('/^\[(.+)\](?::(\d+))?$/', $rawHost, $matches)) {
+            return [$matches[1], isset($matches[2]) ? (int) $matches[2] : 3306];
+        }
+        if (substr_count($rawHost, ':') === 1 && strpos($rawHost, '::') === false) {
+            [$h, $p] = explode(':', $rawHost, 2);
+            return [$h, (int) $p];
+        }
+        return [$rawHost, 3306];
+    })($dbConfig['WORDPRESS_DB_HOST']);
+
+    $mysqli = @mysqli_init();
+    if ($mysqli !== false) {
+        @mysqli_options($mysqli, MYSQLI_OPT_CONNECT_TIMEOUT, 3);
+        $connected = @$mysqli->real_connect(
+            $host,
+            $dbConfig['WORDPRESS_DB_USER'],
+            $dbConfig['WORDPRESS_DB_PASSWORD'],
+            $dbConfig['WORDPRESS_DB_NAME'],
+            $port
+        );
+        if ($connected) {
+            $dbStatus['status'] = 'ok';
+            $dbStatus['detail'] = 'DB connection OK';
+            $mysqli->close();
+        } else {
+            $dbStatus['status'] = 'error';
+            $dbStatus['detail'] = sprintf('DB connect failed: %s', $mysqli->connect_error ?? 'unknown error');
+            $httpStatus = 503;
+        }
+    } else {
+        $dbStatus['status'] = 'error';
+        $dbStatus['detail'] = 'Unable to init mysqli';
+        $httpStatus = 503;
+    }
+} else {
+    $dbStatus['detail'] = 'Missing env: ' . implode(', ', $missingEnv);
+}
+$response['checks'][] = $dbStatus;
+
+http_response_code($httpStatus);
+echo json_encode($response, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES) . "\n";