Git directory outside working directory

I have an old PHP website that I wanted to have its code/content versioned with Git, normally Git setup the repo directory in the “.git” directory inside the working directory, but I faced a problem, if the working directory is accessible from the web server it means “.git” is also accessible too.

Luckily git have an option to have the repo directory located somewhere else using the GIT_DIR environment variable, so here what I did:


$ vi .profile
GIT_DIR=/home/rayed/my_website_git
GIT_WORK_TREE=/var/www/my_website
export GIT_DIR
export GIT_WORK_TREE

You notice that the web site is located in “/var/www/my_website” but the repo is located under totally different directory “/home/rayed/my_website_git”, so the web server can’t access it by mistake.

Monitoring Servers with Munin

This is a draft on configuring Munin to monitor services on a Linux machine, still dirty but published for my reference, if you have question let me know.

Monitoring Servers

sudo apt-get install munin

sudo htpasswd -c /etc/munin/htpasswd rayed

vi vi /etc/munin/munin-conf.d/example_com_site
:
[munin-node.example.com]
    address munin-node.example.com
    use_node_name yes
:


sudo vi vi /etc/nginx/sites-enabled/default
server {
:
location /munin/static/ {
        alias /etc/munin/static/;
        expires modified +1w;
}

location /munin/ {
        auth_basic            "Restricted";
        auth_basic_user_file  /etc/munin/htpasswd;

        alias /var/cache/munin/www/;
        expires modified +310s;
}
:
}

Monitored Servers

sudo apt-get install munin-node
sudo apt-get install munin-plugins-extra

sudo vi /etc/munin/munin-node.conf
:
allow ^172\.18\.100\.100$   # monitoring server address
:

Muni-node-configure

munin-node-configure is really useful command you can use it install all the plugins you need, when you run it will try to test if a plugin can be used or not (–suggest argument), and even give the commands needed to link the plugin automatically (–shell argument)

sudo munin-node-configure --suggest
sudo munin-node-configure --shell

MySQL plugin

sudo apt-get install libcache-perl libcache-cache-perl

sudo munin-node-configure --suggest --shell | sh

sudo munin-run mysql_commands 

sudo service munin-node restart

Memcached plugin

sudo aptitude install libcache-memcached-perl

sudo ln -s /usr/share/munin/plugins/memcached_ /etc/munin/plugins/memcached_bytes
sudo ln -s /usr/share/munin/plugins/memcached_ /etc/munin/plugins/memcached_counters
sudo ln -s /usr/share/munin/plugins/memcached_ /etc/munin/plugins/memcached_rates

sudo munin-run memcached_counters 

sudo service munin-node restart

Nginx Web Server

Configure Nginx to repoer its status under the URL http://localhost/nginx_status, which will be read from Munin Nginx plugin:

sudo vi /etc/nginx/sites-enabled/default
server {
:
        # STATUS
        location /nginx_status {
                stub_status on;
                access_log off;
                allow 127.0.0.1;
                allow ::1;
                allow my_ip;
                deny all;
        }
:
}

sudo service nginx restart

Configure Munin:

sudo apt-get install libwww-perl

sudo ln -s '/usr/share/munin/plugins/nginx_request' '/etc/munin/plugins/nginx_request'
sudo ln -s '/usr/share/munin/plugins/nginx_status' '/etc/munin/plugins/nginx_status'

sudo munin-run nginx_request

sudo service munin-node restart

Postgres

It is better to use munin-node-configure to configure and install postgres plugin, because it will detect installed databases and configure a graph for each.

sudo apt-get install libdbd-pg-perl
sudo munin-node-configure --suggest
sudo sh -c  'munin-node-configure --shell | grep postgres | sh '
sudo service munin-node restart

nginx [Engine X] enters webserver top 5

nginx
nginx [Engine X] became the world 4th most popular web server, according to the latest Netcraft survey.
It is an event based web server, which makes really scalable especially for static files, so if you are serving many images, audio files, video, you might consider it.
It can also configured to work as HTTP and mail proxy.
Of course you should look also at Lighttpd [Lighty] which work with the same principle, and I have been using it for around 2 years for alriyadh.com