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Install Cerb on Amazon Linux

Introduction

This guide will walk you through preparing an Amazon Linux server for installing Cerb, including Nginx, PHP-FPM, and MySQL.

Provision an Amazon Linux server

If you don’t already have a server, you can create an EC2 instance in Amazon Web Services.

This guide uses the following Amazon Machine Image (AMI):

Amazon Linux AMI 2016.09.1 (HVM), SSD Volume Type - ami-f173cc91

Connect to your server

Connect to your server using SSH:


ssh ec2-user@1.2.3.4

Install packages

It’s a good idea to update your installed packages first:


sudo yum -y update

Install PHP 7.0:


sudo yum install -y php70 php70-fpm php70-mysqli php70-mbstring php70-gd php70-imap php70-opcache php70-devel php7-pear gcc

Install Git:


sudo yum install -y git

Install the Nginx web server:


sudo yum install -y nginx

Install mailparse

There isn’t a package for the Mailparse PHP extension in Amazon Linux, but you can use PECL:


sudo pecl7 install mailparse

sudo sh -c 'echo "extension=mailparse.so" > /etc/php-7.0.d/40-mailparse.ini'

Install MySQL

We recommend using a dedicated database server that replicates to a standby server.

If you need to install MySQL on your EC2 instance instead, you can use these instructions:


sudo yum install -y mysql56-server

sudo service mysqld restart

sudo /usr/libexec/mysql56/mysql_secure_installation

Create the MySQL database

Connect to MySQL:


mysql -h localhost -u root -p

If you're using a remote MySQL server, use its internal IP in place of localhost above.

Enter your root password.

Create a new database and user for Cerb:


create database cerb character set utf8;

grant all privileges on cerb.* to cerb@localhost identified by 's3cr3t';

quit;

Replace s3cr3t above with your own secret password. If you're using a remote database server, replace @localhost with a subnet used by your web servers, like: @'10.0.0.%'

Install Cerb

You should now be ready to install Cerb.


cd /usr/share/nginx/html/

sudo git clone https://github.com/cerb/cerb-release.git cerb

sudo chown -R apache:apache cerb

cd cerb

You can test Cerb using PHP’s built in webserver:


sudo service nginx stop

sudo php -S 0.0.0.0:80

Type your server IP into a browser.

You should see the requirements checker with all tests passed:

If you’re just testing Cerb, you can use PHP’s built-in web server and skip the Nginx step below.

Type CTRL + C to kill the PHP web server process.

Since you just ran the web server as root, you should make sure any newly created files are owned by the www-data user and group:


sudo chown -R apache:apache /usr/share/nginx/html/cerb/

Configure Nginx

We’re going to install Nginx as the web server. Cerb’s code will run in PHP-FPM.

SSL

Add your SSL certificate

If you’re using an Elastic Load Balancer you can configure SSL there and use internal IPs without SSL on your web servers. Amazon Certificate Manager can also generate SSL certificates for free.

Otherwise, you’ll need a valid SSL certificate for your server. We recommend Let’s Encrypt or a RapidSSL certificate from CheapSSLsecurity.

Enable Perfect Forward Secrecy (this may take a few minutes):


sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048

Creating a self-signed SSL certificate

For testing, you can also create a self-signed SSL certificate. You should not use these instructions in production:


sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
-keyout /etc/pki/tls/private/nginx-selfsigned.key \
-out /etc/ssl/certs/nginx-selfsigned.pem


Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:California
Locality Name (eg, city) []:
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Example, Inc.
Organizational Unit Name (eg, section) []:Internet
Common Name (e.g. server FQDN or YOUR name) []:cerb.example
Email Address []:support@cerb.example

Add a virtual host

Add a new virtual host to Nginx:


sudo vi /etc/nginx/conf.d/cerb.conf

Type i to switch to insert mode and paste the following:



server {
  listen 80;
  server_name cerb.example;
  #access_log off;

  location /status/nginx {
    stub_status on;
    access_log off;
    allow 127.0.0.1;
    deny all;
  }

  location /status/fpm {
    access_log off;
    allow 127.0.0.1;
    #allow 10.0.0.0/16;
    deny all;
    include fastcgi_params;
    fastcgi_pass   localhost:9000; #unix:/var/run/php/php7.0-fpm.sock;
  }

  location / {
    return 301 https://$host$request_uri;
  }
}

server {
  listen 443 ssl;
  server_name cerb.example;
  #access_log off;
  
  root /usr/share/nginx/html/cerb;
  index index.php;

  # Increase upload max size from default of 1MB
  client_max_body_size 30m;
	  
  charset utf-8;

  # SSL
  ssl_certificate /etc/ssl/certs/nginx-selfsigned.pem;
  ssl_certificate_key /etc/pki/tls/private/nginx-selfsigned.key;
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  ssl_prefer_server_ciphers on;
  ssl_ciphers HIGH:!CAMELLIA:!RC4:!PSK:!aNULL:@STRENGTH;
  ssl_dhparam /etc/ssl/certs/dhparam.pem;

  # DNS
  resolver 8.8.8.8 8.8.4.4 valid=300s;
  resolver_timeout 5s;

  # Always let people see the favicon file
  location = /favicon\.ico {
    allow all;
  }
  
  # Send PHP scripts to FPM
  location ~ /(index|ajax)\.php$ {
    proxy_connect_timeout 120;
    proxy_send_timeout 120;
    proxy_read_timeout 120;
    
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass   localhost:9000; #unix:/var/run/php/php7.0-fpm.sock;
    fastcgi_index  index.php;
    include    fastcgi_params;
    fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
  }

  location ~ \.php$ {
    deny all;
  }
  
  # Send all other paths to the Devblocks front controller index.php
  location / {
    try_files $uri /index.php?$query_string;
  }
}


On lines 3 and 29 change cerb.example to the domain name of your server. If for some reason you don’t have one, you can temporarily use your server IP.

The first server block (lines 1-25) redirects all HTTP requests to HTTPS with SSL. It also defines some /status pages you can use to monitor the server (lines 6 and 13).

On lines 41-42, you should use your own SSL key and certificate.

Save the file with :wq

Test Nginx configuration

You can test the Nginx configuration file with:


sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Restart Nginx and PHP-FPM


sudo service nginx restart

sudo service php-fpm restart

For more information about Nginx + PHP-FPM, see: https://www.nginx.com/resources/wiki/start/topics/examples/phpfcgi/

Run the Cerb installer

Type the hostname of your server into a browser and follow the guided installer.