Fragmenting one big nginx config

15. Nov. 2009 at 14:51 under Python, Nginx, English

Getting lost in all glory of big nginx.conf is not that uncommon. I could not stand it anymore, so I wrote this little clever script with support of pyparsing module for Python:

from pyparsing import *

nginx_conf_expr = OneOrMore(Suppress(SkipTo('server' + White())) + originalTextFor(Word('server ') + nestedExpr('{', '}'))).parseWithTabs()
server_name_expr = (Suppress(SkipTo('server_name' + White()) + Word('server_name') + White()) +  CharsNotIn(' ;')).parseWithTabs()

nginx_conf = open('nginx.conf').read()
new_nginx_conf = str(nginx_conf)

for server in nginx_conf_expr.parseString(nginx_conf):
    try:
        name = server_name_expr.parseString(server)[0]
        f = open('nginxsite_%s.conf' % name, 'w+')
        f.write(str(server))
        f.close()

    # update nginx config
    new_nginx_conf = new_nginx_conf.replace(str(server), '')
    except:
        print 'Entry failed:\n', server

open('new_nginx.conf', 'w').write(new_nginx_conf)

Warning! Do not use that on production data before making a backup copy! Script has been tested on ~1500 long nginx config, and is not bulletproof This script basically extracts all server {} entries and writes them to separate files named "nginxsite_sitename.conf" (all in current working directory). It also produces new_nginx.conf that does not include extracted entries. All you need to do is to add include directive to new_nginx.conf like this:

# path is relative to this global nginx.conf
  include sites/*.conf;

Note that I haven't made it very customizable (it should be with little python knowledge).

Example:

temp $ ls
migrate_nginx_config.py
nginx.conf

temp $ python migrate_nginx_config.py
migrate_nginx_config.py
nginx.conf
new_nginx.conf
nginxsite_www.fubar.si.conf
nginxsite www.tvnext.si.conf
...