How to create a SSL with Letsencrypt

Letsencrypt for Nginx

Your web server ports (443,80) must be open the public;

user@webserver:~$ git clone https://github.com/letsencrypt/letsencrypt
user@webserver:~$ cd letsencrypt
user@webserver:~/letsencrypt$ ./letsencrypt-auto --help

user@webserver:$./letsencrypt-auto certonly --standalone --agree-tos --redirect --duplicate --text --email your@mailaddress -d yourdomain.com

Open Nginx config file;

server {

listen 443 ssl;

    ssl_certificate         /etc/letsencrypt/live/helloworld.letsencrypt.org/fullchain.pem;
    ssl_certificate_key     /etc/letsencrypt/live/helloworld.letsencrypt.org/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/helloworld.letsencrypt.org/fullchain.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;

ssl_dhparam /etc/nginx/dhparam.pem;

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';

ssl_prefer_server_ciphers on;

add_header Strict-Transport-Security max-age=15768000;

ssl_stapling on; ssl_stapling_verify on;

}

For more information ;

https://github.com/letsencrypt/letsencrypt 

Install Node.js with Standard Binary Packages

You can determine the CPU architecture of your server with these commands:

$ getconf LONG_BIT

64

$ uname -p

x86_64

You can download this file from the browser or from the console. The latter is shown below (Note: the specific Node.js version might be different for you):

$ wget http://nodejs.org/dist/v0.12.0/node-v0.12.0-linux-x64.tar.gz

From a console window, go to the directory to which the Node.js binary was downloaded, and then execute the following command to install the Node.js binary package in “/usr/local/” or "/usr/":

$ sudo tar -C /usr/local --strip-components 1 -xzf node-v0.12.7-linux-x86.tar.gz

You should now have both node and npm installed in “/usr/bin”. You can check this typing:

$ ls -l /usr/local/bin/node

$ ls -l /usr/local/bin/npm

Dtrace installation on Debian 7

When I install the dtrace via systemtap I had an error like this "could not load module build-3.2.0-4-amd64/driver/dtracedrv.ko: No such file or directory"

How I solved the problem;
$sudo apt-get install linux-headers-$(uname -r)

Dtrace installation;

$git clone "https://github.com/dtrace4linux/linux.git" dtrace
$sudo apt-get install linux-headers-$(uname -r)

$cd dtrace
$tools/get-deps.pl
$sudo make all 

$sudo make install

$sudo make load

$sudo dtrace -l