Wednesday, February 8, 2017

Piwik Installation

This applies to Ubuntu 16.04 LTS.

Compiled from https://www.howtoforge.com/tutorial/installing-nginx-with-php7-fpm-and-mysql-on-ubuntu–16.04-lts-lemp/

Install MySQL

See also https://support.rackspace.com/how-to/configuring-mysql-server-on-ubuntu/

Run the following and provide the appropriate answers to subsequent prompts: apt-get -y install mysql-server mysql_secure_installation If you want to manage your MySQL instance from external computers choose No to the question Disallow root login remotely? and change the mysql.conf (usually found in /etc/mysql/mysql.conf.d/mysqld.cnf) and set the bind-address parameter to 0.0.0.0. To find the actual path for the configuration file run /usr/sbin/mysqld --help --verbose If you install Piwik on the same machine this is not required.

Create database/user for Piwik

$ mysql -u root -p
mysql> CREATE DATABASE piwik;
mysql> CREATE USER 'piwik'@'localhost' IDENTIFIED BY 'change_to_real_password';
mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES ON piwik.* TO 'piwik'@'localhost';
mysql> EXIT

Install Nginx

If you have already installed Apache, remove it:

service apache2 stop
update-rc.d -f apache2 remove
apt-get remove apache2
sudo -i
apt-get update
apt-get -y install nginx

Check the status of the firewall

Nginx registers itself with ufw so:

  • Check of ufw is enabled: ufw status
  • If enabled then register one of the Nginx registered profiles (found out by running ufw app list) like:
    • ufw allow 'Nginx HTTP'

Check Nginx

From within a browser try http://\<IP\>

Install PHP 7

apt-get -y install php7.0-fpm

Modify default site configuration file /etc/nginx/sites-available/default by de-commenting the following lines:

...
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
...
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

...
    location ~ /\.ht {
        deny all;
    }

Reload Nginx:

service nginx reload

Open /etc/php/7.0/fpm/php.ini and set cgi.fix_pathinfo=0: Restart php:

service php7.0-fpm reload

Check the installation

Create info.php in /var/www/html/info.php with the following content:

<?php
phpinfo();
?>

Watch out for CRLFs on Windows (end of line should be \n regularly in Linux).

Try now http://<IP>/info.php

Install additional packages required by Piwik

apt-get -y install php7.0-curl php7.0-gd php7.0-cli php-geoip php7.0-mysql
apt-get -y install php-mbstring php7.0-mbstring
apt-get -y install php-xml

Install Piwik

Run:

cd /tmp
apt-get install unzip
wget https://builds.piwik.org/piwik.zip && unzip piwik.zip
mkdir /var/www//html/piwik
cp -R ./piwik/* /var/www/html/piwik
chown -R www-data:www-data /var/www/html/piwik
chmod -R 0755 /var/www/html/piwik/tmp

Now browse to http://<FQDN>/piwik/index.php

Configure your Piwik instance. The following script-let should be included in each page of your site (as specified by the setup:Make sure this code is on every page of your website. We recommend to paste it immediately before the closing </head> tag.). Be sure to change the <FQDN> with the appropriate value.

<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  // tracker methods like "setCustomDimension" should be called before "trackPageView"
  _paq.push(['trackPageView']);
  _paq.push(['enableLinkTracking']);
  (function() {
    var u="//<FQDN>/piwik/";
    _paq.push(['setTrackerUrl', u+'piwik.php']);
    _paq.push(['setSiteId', '1']);
    var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
    g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Piwik Code -->

Publishing Problem

The monitored site had some peculiarities:

  • It is used from intranet or from internet, published through a reverse proxy
  • It can be used over plain HTTP or over HTTPS (through SSO or from internet); when used over HTTP from intranet it worked fine but over HTTPS (also from intranet) the request to Piwik (due to security reasons) was also done over HTTPS which obviously failed (the //<FQDN>/piwik/ syntax indicates to the browser to make the request over the same protocol as the referral page was loaded)

So overall the default Piwik installation didn’t work since it was not accessible through HTTPS nor from internet.

The first step was to publish the site through the same reverse proxy, both HTTP and HTTPS (with the tunnel being terminated at proxy level) with Forward Original HOST Header set to Off. Trying to access the administrative interface through the public FQDN led to a security error (something with actual Referral not matching the expected one).

Next step was to change the proxy settings so that the original HOST header was forwarded to Piwik. Another error popped up stating (as a conclusion, the error text was rather stupid like Piwik was accessed from [URL] but it was configured to be accessed from [URL]) that the value of the HOST header is not registered as safe in config\config.ini.php.

By adding the FQDN in [General] section as:

trusted_hosts[] = "FQDN"

the integration works just fine.

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