WEBrick doesn't work (permission/port error)

Ruby
1

Hi.

I get an error when I start a WEBrick server.

Here’s my application.

server.rb

encoding: utf-8

require ‘webrick’

class Server
class << self
def start(config = {})
config.merge(:BindAddress => ‘0.0.0.0’, :Port => 4321)
server = WEBrick::HTTPServer.new(config)
trap(‘INT’) { server.shutdown }
end
end
end

Server.start

$ ruby1.9.2dev server.rb
[2009-12-08 00:21:53] INFO WEBrick 1.3.1
[2009-12-08 00:21:53] INFO ruby 1.9.2 (2009-11-14) [i686-linux]
[2009-12-08 00:21:58] WARN TCPServer Error: Permission denied - bind(2)
[2009-12-08 00:21:58] WARN TCPServer Error: Permission denied - bind(2)
/opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in initialize': Permission denied - bind(2) (Errno::EACCES) from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:innew’
from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in
block in create_listeners' from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:70:ineach’
from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:70:in
create_listeners' from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/server.rb:74:inlisten’
from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/server.rb:62:in
initialize' from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/httpserver.rb:24:ininitialize’
from server.rb:24:in new' from server.rb:24:instart’
from server.rb:31:in `’

When I start it as a root I get another error.

ruby1.9.2dev server.rb

[2009-12-08 00:26:18] INFO WEBrick 1.3.1
[2009-12-08 00:26:18] INFO ruby 1.9.2 (2009-11-14) [i686-linux]
[2009-12-08 00:26:23] WARN TCPServer Error: Address already in use -
bind(2)

I also get these errors while I use a stable version of Ruby (1.9.1). I
haven’t got any other applications working on port 4321.

Debian GNU/Linux 5.0.3;
Ruby 1.9.1, 1.9.2dev;
WEBrick 1.3.1.

What is the reason of this bug?

Thanks.

2

On Dec 7, 6:34 pm, “P. A.” [email protected] wrote:

Server.start
from /opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/utils.rb:73:in
/opt/ruby-1.9.2-dev/lib/ruby/1.9.1/webrick/httpserver.rb:24:in
[2009-12-08 00:26:23] WARN TCPServer Error: Address already in use -

Is not a bug, it clearly indicates that another process/server is
already bound to that port.

Please verify that your script wasn’t running in the background or you
using a port that is already in use by other program/service.

3

I solved it by myself.

The problem was that I stated a WEBrick server without initial
configuration because I used the Hash#merge method instead Hash#merge!
(mutator).

So, the code should be changed to work properly.

IT DOESN’T WORKS!

encoding: utf-8

require ‘webrick’

class Server
class << self
def start(config = {})
config.merge(:BindAddress => ‘0.0.0.0’, :Port => 4321) # the error
source
puts config # returns {} on start
server = WEBrick::HTTPServer.new(config)
trap(‘INT’) { server.shutdown }
server.start
end
end
end

WORKS!

encoding: utf-8

require ‘webrick’

class Server
class << self
def start(config = {})
config.merge!(:BindAddress => ‘0.0.0.0’, :Port => 4321) # changes
the config hash
puts config # returns {:BindAddress => ‘0.0.0.0’, :Port => 4321}
on start
server = WEBrick::HTTPServer.new(config)
trap(‘INT’) { server.shutdown }
server.start
end
end
end

Cheers!