Load Generator

.gitignore

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+docker/wordpress/ephemeral/
+docker/wordpress/data/ext

docker/wordpress/.env

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+IP=127.0.0.1
+
+# mysql
+DB_ROOT_PASSWORD=bKDYgDdJ9A67yZs8
+DB_NAME=wp_test
+
+# wordpress
+WP_IMAGE_VERSION=php7.3-fpm-alpine
+
+# nginx
+# NGINX_VERSION=

docker/wordpress/README.md

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+# Load Testing with Wordpress
+
+Simulate real load on a wordpress site, while randomly throwing errors in the wp app.
+
+See: http://127.0.0.1:8000/info.php
+
+## Configuration
+Please go to `./data/elasticapm.ini` and add the correct values to point to the APM server (e.g.).
+
+## Run the Simulator
+```
+docker-compose up
+```

docker/wordpress/data/elasticapm.ini

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+; configuration for Elastic APM agent
+extension = elasticapm.so
+
+; Enable the agent to collect
+elasticapm.enable = 0
+
+; APM Server
+elasticapm.host = http://localhost:8200
+
+; Secret Token for APM Server auth
+elasticapm.secret_token =
+
+; Name for APM UI
+elasticapm.service_name = "wordpress-test"

docker/wordpress/data/nginx/conf.d/default.conf

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+server {
+    listen 8000;
+    server_name 127.0.0.1;
+
+    root /var/www/html;
+    index index.php;
+
+    access_log /var/log/nginx/access.log;
+    error_log /var/log/nginx/error.log;
+
+    location / {
+        try_files $uri $uri/ /index.php?$args;
+    }
+
+    location ~ \.php$ {
+        try_files $uri =404;
+        fastcgi_split_path_info ^(.+\.php)(/.+)$;
+        fastcgi_pass wordpress:9000;
+        fastcgi_index index.php;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+        fastcgi_param PATH_INFO $fastcgi_path_info;
+    }
+}

docker/wordpress/data/pinger/requirements.txt

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+requests==2.22.0

docker/wordpress/data/pinger/run.sh

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+#!/bin/sh
+
+echo "starting load generating in 30 seconds .."
+sleep 10
+echo "> starting load generating in 20 seconds .."
+sleep 10
+echo "> starting load generating in 10 seconds .."
+sleep 7
+echo "> starting load generating in 3 seconds .."
+sleep 1
+echo "> in 2 seconds .."
+sleep 1
+echo "> in 1 second .."
+sleep 1
+/usr/local/bin/python /app/runner.py

docker/wordpress/data/pinger/runner.py

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+#!/usr/bin/python
+
+import sys
+import requests
+import random
+import logging
+import time
+
+from queue import Queue
+from threading import Thread
+
+root = logging.getLogger()
+root.setLevel(logging.DEBUG)
+
+handler = logging.StreamHandler(sys.stdout)
+handler.setLevel(logging.INFO)
+formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+handler.setFormatter(formatter)
+root.addHandler(handler)
+
+_timeout = 0.50
+_n_threads = 4
+if len(sys.argv) == 2:
+    _n_threads = int(sys.argv[1])
+
+endpoints = [
+    'http://nginx:8000/',
+    'http://nginx:8000/?page_id=2',
+    'http://nginx:8000/?page_id=16',
+    'http://nginx:8000/?p=6',
+    'http://nginx:8000/?p=8',
+    'http://nginx:8000/?p=10#comments',
+    'http://nginx:8000/?p=12',
+    'http://nginx:8000/?p=14',
+    'http://nginx:8000/?author=1',
+    'http://nginx:8000/?cat=1',
+]
+
+def do_request(q, wid):
+    while True:
+        if q.empty() == False:
+            url = q.get()
+            headers = {'content-type': 'application/json', 'Accept-Charset': 'UTF-8'}
+
+            # Add randomly a dist. tracing header
+            if random.randint(0, 10) == wid:
+                a = random.randint(1000, 9999)
+                b = random.randint(1000, 9999)
+                headers['elastic-apm-traceparent'] = "00-%da6be83a31fb66a455cbb74ab%d-%dfae6bd7c%d-01" % (a, b, b, a)
+
+            # Do Request
+            r = requests.get(url, headers=headers)
+            logging.info("[%d] worker %d - %s" % (r.status_code, wid, url))
+
+        time.sleep(_timeout)
+
+if __name__ == '__main__':
+    q = Queue()
+
+    for i in range(_n_threads):
+        worker = Thread(target=do_request, args=(q, i))
+        worker.setDaemon(True)
+        worker.start()
+
+    while True:
+        url = random.choice(endpoints)
+        q.put(url)
+
+    q.join()

docker/wordpress/data/wordpress/install-ext.sh

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+#!/bin/sh
+
+cd /var/elasticapm
+
+phpize
+./configure --enable-elasticapm
+make clean
+make
+make install

docker/wordpress/data/wordpress/php/fatal.php

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+<?php
+
+$fatal = 1 / 0;

docker/wordpress/data/wordpress/php/wp-config.php

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+<?php
+// agent testing ..
+/**
+ * The base configuration for WordPress
+ *
+ * The wp-config.php creation script uses this file during the
+ * installation. You don't have to use the web site, you can
+ * copy this file to "wp-config.php" and fill in the values.
+ *
+ * This file contains the following configurations:
+ *
+ * * MySQL settings
+ * * Secret keys
+ * * Database table prefix
+ * * ABSPATH
+ *
+ * @link https://codex.wordpress.org/Editing_wp-config.php
+ *
+ * @package WordPress
+ */
+
+// ** MySQL settings - You can get this info from your web host ** //
+/** The name of the database for WordPress */
+define( 'DB_NAME', 'wp_test');
+
+/** MySQL database username */
+define( 'DB_USER', 'root');
+
+/** MySQL database password */
+define( 'DB_PASSWORD', 'bKDYgDdJ9A67yZs8');
+
+/** MySQL hostname */
+define( 'DB_HOST', 'db:3306');
+
+/** Database Charset to use in creating database tables. */
+define( 'DB_CHARSET', 'utf8');
+
+/** The Database Collate type. Don't change this if in doubt. */
+define( 'DB_COLLATE', '');
+
+/**#@+
+ * Authentication Unique Keys and Salts.
+ *
+ * Change these to different unique phrases!
+ * You can generate these using the {@link https://api.wordpress.org/secret-key/1.1/salt/ WordPress.org secret-key service}
+ * You can change these at any point in time to invalidate all existing cookies. This will force all users to have to log in again.
+ *
+ * @since 2.6.0
+ */
+define( 'AUTH_KEY',         'b21ce659a9b0b45a0a51a16b9bd5850ed8f549a0');
+define( 'SECURE_AUTH_KEY',  'd1d64b11960845e1f97317e82829f304a4dd9c44');
+define( 'LOGGED_IN_KEY',    '622b029b7e6290b8dfa38a07cd646126887aad55');
+define( 'NONCE_KEY',        '30fb269e23e2a45cdd4755342a065de87b1b5ee1');
+define( 'AUTH_SALT',        '1ab0ff081770ca4c433a47846152673eb076efa3');
+define( 'SECURE_AUTH_SALT', '480566c90374db54ea424cc1119152e4e9320632');
+define( 'LOGGED_IN_SALT',   '93ae0d32c94fa9b3ed45e2c4c67abb313faa5f55');
+define( 'NONCE_SALT',       '7ec4a3dfbe9324f617cdc6671e56794bb5085419');
+
+/**#@-*/
+
+/**
+ * WordPress Database Table prefix.
+ *
+ * You can have multiple installations in one database if you give each
+ * a unique prefix. Only numbers, letters, and underscores please!
+ */
+$table_prefix = 'wp_';
+
+/**
+ * For developers: WordPress debugging mode.
+ *
+ * Change this to true to enable the display of notices during development.
+ * It is strongly recommended that plugin and theme developers use WP_DEBUG
+ * in their development environments.
+ *
+ * For information on other constants that can be used for debugging,
+ * visit the Codex.
+ *
+ * @link https://codex.wordpress.org/Debugging_in_WordPress
+ */
+define( 'WP_DEBUG', false );
+
+// If we're behind a proxy server and using HTTPS, we need to alert Wordpress of that fact
+// see also http://codex.wordpress.org/Administration_Over_SSL#Using_a_Reverse_Proxy
+if (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') {
+	$_SERVER['HTTPS'] = 'on';
+}
+
+/* That's all, stop editing! Happy publishing. */
+
+/** Absolute path to the WordPress directory. */
+if ( ! defined( 'ABSPATH' ) ) {
+	define( 'ABSPATH', dirname( __FILE__ ) . '/' );
+}
+
+//
+// Simple "Chaos monkey" to introduce random errors
+//
+if(rand(1, 5) == rand(1, 5)) {
+	throw new Exception("Random Error by Chaos Monkey.");
+}
+
+//
+// Throw a FATAL PHP Error @ 1% likelyhood
+//
+if(rand(1, 10) == rand(1, 10)) {
+	require_once( ABSPATH . 'fatal.php' );
+}
+
+/** Sets up WordPress vars and included files. */
+require_once( ABSPATH . 'wp-settings.php' );

docker/wordpress/docker-compose.yml

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+version: '3'
+
+services:
+  wp:
+    container_name: wordpress
+    build:
+      dockerfile: ${PWD}/dockerfiles/wordpress/Dockerfile
+      context: ${PWD}
+    volumes:
+      - wp_app:/var/www/html
+    environment:
+      WORDPRESS_DB_HOST: db
+      WORDPRESS_DB_NAME: "${DB_NAME}"
+      WORDPRESS_DB_USER: root
+      WORDPRESS_DB_PASSWORD: "${DB_ROOT_PASSWORD}"
+    depends_on:
+      - db
+    links:
+      - db
+    restart: always
+
+  db:
+    image: mysql:5.7
+    container_name: mysql_57
+    ports:
+      - ${IP}:3306:3306
+    command: [
+        '--default_authentication_plugin=mysql_native_password',
+        '--character-set-server=utf8mb4',
+        '--collation-server=utf8mb4_unicode_ci'
+    ]
+    volumes:
+      - ${PWD}/data/mysql-dump:/docker-entrypoint-initdb.d
+      - db_data:/var/lib/mysql
+    environment:
+      MYSQL_DATABASE: "${DB_NAME}"
+      MYSQL_ROOT_PASSWORD: "${DB_ROOT_PASSWORD}"
+    restart: always
+
+  nginx:
+    image: nginx:${NGINX_VERSION:-latest}
+    container_name: nginx
+    ports:
+      - '8000:8000'
+    volumes:
+      - ${PWD}/data/nginx/conf.d/:/etc/nginx/conf.d
+      - wp_app:/var/www/html
+#      - ${PWD}/ephemeral/logs/nginx:/var/log/nginx
+    depends_on:
+      - wp
+    restart: always
+
+  pinger:
+    container_name: pinger
+    build:
+      dockerfile: ${PWD}/dockerfiles/pinger/Dockerfile
+      context: ${PWD}
+    tty: true
+    depends_on:
+      - nginx
+    command: ['/app/run.sh']
+
+volumes:
+  db_data: {}
+  wp_app: {}

docker/wordpress/dockerfiles/pinger/Dockerfile

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+FROM python:3.7.2-alpine3.9
+
+RUN apk update
+RUN apk add curl
+
+WORKDIR /app
+
+COPY ./data/pinger /app
+RUN pip install --upgrade pip
+RUN pip install -r requirements.txt
+RUN chmod +x runner.py
+
+ENTRYPOINT [ "/bin/sh" ]

docker/wordpress/dockerfiles/wordpress/Dockerfile

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+FROM wordpress:php7.3-fpm-alpine
+
+COPY ./data/wordpress/php/. /var/www/html/.
+RUN echo "<?php phpinfo();" > /var/www/html/info.php
+
+# Compile the ext
+RUN apk add build-base autoconf curl-dev
+COPY ./data/elasticapm.ini /usr/local/etc/php/conf.d/elasticapm.ini
+COPY ./data/ext /var/elasticapm
+COPY ./data/wordpress/install-ext.sh /var/elasticapm/install-ext.sh
+RUN chmod +x /var/elasticapm/install-ext.sh
+RUN /var/elasticapm/install-ext.sh