Wednesday, July 4, 2012

The NGINX's RAM-only Jail. Adding nginx to RAM-only diskless Linux box

Without any doubt, nginx is one of the best ever created HTTP servers, it solves the C10K problem with an elegant event-drive architecture. Many big sites around the WWW use it: Wikipedia, Hyves, etc.

This is a how to prepare your rambox to run nginx smoothly. It makes sense only after the preparation of the RAM-only PXE boot in my previous post. This post isn't about any kind of nginx optimization stuff beside of its compilation in a single binary rock. At the end of this guide, you will be running the nginx very much like in a jail.

Run these steps BEFORE the step "Change ownership to everything" at RAM-only PXE boot in my previous post.
  1. Download latest stable version nginx and upack it.
  2. $ pushd /tmp/wrk
    $ ngx=nginx-1.2.1.tar.gz
    $ cache $ngx$ngx
    $ tar -xvzf /tmp/cache/$ngx -C .
    $ mv $ngx nginx
  3. Add options depending on the features that you want to support. Beside of the default options I only add static compilation options:
  4. $ pushd nginx
    $ ./configure --with-ld-opt="-static -static-libgcc" \
      --with-cc-opt="-static -static-libgcc"
    make it (jN means N threads devoted to compilation and linking):
    $ make -j2
    ensure that it's not a dynamic executable:
    $ ldd objs/nginx
     not a dynamic executable
    $ popd
  5. Copy the nginx executable to rambox's /sbin :
    $ popd 
    $ pushd sbin
    $ chmod +w .
    $ cp ../../nginx/objs/nginx .
    $ chmod -w .
    $ popd
  6. Create /usr/local/nginx directories:
  7. $ mkdir -p -m 0755 usr/local/nginx/{conf,logs}
  8. Copy some needed libs:
  9. $ chmod +w lib
    $ cp /lib64/{,} lib/
    $ cp /lib64/{,} lib/
    $ cp /lib64/{,} lib/
    $ cp /lib64/{,} lib/
    $ chmod -w lib
  10. Copy mime conf file:
  11. $ cp ../nginx/conf/mime.types usr/local/nginx/conf/
  12. Create the nginx.conf file with some basic settings:
  13. $ dd of=usr/local/nginx/conf/nginx.conf << EOT
    # user and group to run nginx
    user www www;
    # numbers of dedicated CPUs
    worker_processes 1;
    # pid archive
    pid /var/run/;
    events {
        # max connections in WAIT 
        worker_connections  128;
        # accept & enqueue NEW connections, put them in WAIT
        multi_accept        on;
    http {
            include       mime.types;
            default_type  application/octet-stream;
            server {
                    listen 80;
                    autoindex on;
                    location / {
                            root /var/www;
                            index  index.php index.html index.htm;
  14. Resume the rambox creation process and once it gets started run:
  15. $ nginx
Enjoy it by browsing at http://HOSTADDRESS

Post install steps

Daemonize nginx by running it at /init script!

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