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• Override the bounce recipient address in exim4

  - by jerhinesmith

  I have a small app that allows a user to share an item by generating an email to a supplied email address. We set the "from" and "reply to" values to be the sender's address, so that when the email reaches the recipient, it appears to have come from the sender. This works wonderfully except when an email gets bounced. Currently, on bounces, exim attempts to redeliver the message periodically while simultaneously sending error emails back to the sender. I'd rather have those emails basically routed to an empty mailbox somewhere as there's nothing really that the sender can do about it. I found some documentation on bounced emails here: http://www.exim.org/exim-html-4.67/doc/html/spec_html/ch46.html and it claims that "Exim sends a message to the original sender, or to an alternative configured address.", but it doesn't say exactly how to configure an alternative address. Ideas?

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• Varnish with multiple sites/boxes

  - by jerhinesmith

  Is it possible for Varnish to redirect traffic to different IPs based on the url? For example, is the following setup feasible (and if so, what would the VCL look like): *.example.com points to Varnish IP address When a request is made to foo.example.com, varnish checks the cache and sends the request to Server1's IP address on a cache miss. When a request is made to bar.example.com, varnish checks the cache and sends the request to Server2's IP address on a cache miss. foo and bar are (for the most part) completely unrelated sites. They use the engine, but have different content and their own distinct database. Since there previously was no penalty for doing so (other than cost) we split them up into two separate boxes so that a ton of traffic to foo won't have a negative impact on visitors browsing around bar. I could set up two instances of varnish and have one serve up foo's static content and the other serve up bar's, but as there doesn't seem to be much overhead to running Varnish, I think (perhaps mistakenly) that it would make more sense to go with one Varnish server that redirects the traffic to the appropriate box on a cache miss.

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• Windows Not Honoring DHCP Scope

  - by jerhinesmith

  Please bear with me as I'm not a networking person by trade. Our current configuration at work includes two Windows Servers serving as DHCP/Active Directory servers (if that makes sense) -- one replicating from the other. On both machines, the DNS resolution is set up as: Main Windows Box (10...* address) Public IP Address (for Verizon) Public IP Address (secondary Verizon) Secondary Windows Box (10...* address) Assuming our domain is foo.com, we maintain the foo.com website on a hosted VPS with it's own IP address. The problem is that even though bar.foo.com is an internal server and is defined in DNS on the Primary Windows machine, when I ping bar or even bar.foo.com it resolves to the hosted IP address instead of the 10.* address. I tried taking both of the Public IP addresses out of the DHCP scope, and that seemed to work, but it completely slowed down access to any external sites, so that wasn't acceptable. I also tried adding the two Windows machine as the DNS servers on my desktop. That too worked, but I'd rather not have everything enter their DNS servers, as the above setup should theoretically be working. Is there anything I could check to see why pinging bar.foo.com isn't resolving to the DNS entry on the Windows machines? Here's a summary of the ping results, if they help: Pinging from servers with static IP bar.foo.com resolves with correct IP address Pinging from linux machines not joined to the domain bar.foo.com resolves with correct IP address Pinging from user's desktop machines, joined to the domain, but dynamic IP bar.foo.com resolves with incorrect IP address This is driving me crazy!

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• Varnish with multiple hosts/subdomains

  - by jerhinesmith

  I'm new to Varnish, and I'm hoping it already does this "out of the box", but I'd like to clarify before I consider using it in production: Here's my setup: I have multiple sites running off of the same machine that vary by subdomain (i.e. user1.example.com, user2.example.com, etc.) Each "site" has a profile picture that has the same name (i.e. user1.example.com/profile.png, user2.example.com/profile.png) Will Varnish recognize these as separate resources and cache them accordingly? Or will I need to change something in the VCL to tell it include the full host url when looking up cache hits?

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• How to test lib files in Rails?

  - by jerhinesmith

  I understand the benefit of putting classes, modules, etc. in the lib folder in Rails, but I haven't been able to find a clean way of testing these files. For the most part, it seems like unit tests would be the logical approach. I guess my question is: What is the "rails way" for testing lib files?

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• Automating rake doc:app

  - by jerhinesmith

  For you rails programmers, what's the easiest way to keep your RDoc files up-to-date? I know I can run rake doc:app manually, but I really don't feel like adding a manual step to the check-in process, and since we're already using cruisecontrolrb to handle deployment and testing automation, it seems like there should be an easy way to regenerate these files on check-in. Is anyone already automating rake doc:app? And, if so, what are your suggestions?

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• Best way to play MIDI sounds using C#

  - by jerhinesmith

  I'm trying to rebuild an old metronome application that was originally written using MFC in C++ to be written in .NET using C#. One of the issues I'm running into is playing the midi files that are used to represent the metronome "clicks". I've found a few articles online about playing MIDI in .NET, but most of them seem to rely on custom libraries that someone has cobbled together and made available. I'm not averse to using these, but I'd rather understand for myself how this is being done, since it seems like it should be a mostly trivial exercise. So, am I missing something? Or is it just difficult to use MIDI inside of a .NET application?

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• Git Workflow With Capistrano

  - by jerhinesmith

  I'm trying to get my head around a good git workflow using capistrano. I've found a few good articles, but I'm either not grasping completely what they're suggesting (likely) or they're somewhat lacking. Here's kind of what I had in mind so far, but I get caught up when to merge back into the master branch (i.e. before moving to stage? after?) and trying to hook it into capistrano for deployments: Make sure you’re up to date with all the changes made on the remote master branch by other developers git checkout master git pull Create a new branch that pertains to the particular bug you're trying to fix git checkout -b bug-fix-branch Make your changes git status git add . git commit -m "Friendly message about the commit" So, this is usually where I get stuck. At this point, I have a master branch that is healthy and a new bug-fix-branch that contains my (untested -- other than unit tests) changes. If I want to push my changes to stage (through cap staging deploy), do I have to merge my changes back into the master branch (I'd prefer not to since it seems like master should be kept free of untested code)? Do I even deploy from master (or should I be tagging a release first and then modifying my production.rb file to deploy from that tag)? git-deployment seems to address some of these workflow issues, but I can't seem to find out how on earth it actually hooks into cap staging deploy and cap production deploy. Thoughts? I assume there's a likely canonical way to do this, but I either can't find it or I'm too new to git to recognize that I have found it. Help!

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• Partial form with nested routes

  - by jerhinesmith

  I have two models -- User and Entry -- that are related through a has_many relationship (a User has many Entries). I'm using RESTful routing, and have the following in my routes.rb file: map.resource :user, :controller => "users" do |user| user.resources :entries end This seems to work, but in my partial _form file, when I do this: form_for [@current_user, @entry] do |f| # Form stuff end It generates a URL like this: /user/entries.%23%3Cuser:0xb6a6aea8%3E instead of /user/entries Am I missing something? I should note that the correct classes are applied to the form when doing creation vs. editing, so it does seem to be correctly interpreting what I'm trying to do -- it's just that I can't submit the form to an invalid url.

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• Service-Based Authentication Using Tokens

  - by jerhinesmith

  I'm having a tough time trying to find clear and concise examples of how one would implement a service-based authentication scheme using tokens. As far as I can tell, the basic steps are as follows: Client requests username/password from user Client passes username/password to identity provider Provider checks username/password and sends back a token if the user is valid Client does something with the token? The third and fourth step are where I'm getting stuck. I assume the "token" in this case just has to be either an encrypted string that the client can decrypt or some random string that gets stored somewhere (i.e. a database) that the client can then verify against, but I'm not really sure what the client is then supposed to do with the token or why you even need a token at all -- couldn't a simple user ID also suffice?

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• Git: What is a tracking branch?

  - by jerhinesmith

  Can someone explain a "tracking branch" as it applies to git? Here's the definition from git-scm.com: A 'tracking branch' in Git is a local branch that is connected to a remote branch. When you push and pull on that branch, it automatically pushes and pulls to the remote branch that it is connected with. Use this if you always pull from the same upstream branch into the new branch, and if you don't want to use "git pull" explicitly. Unfortunately, being new to git and coming from SVN, that definition makes absolutely no sense to me. I'm reading through "The Pragmatic Guide to Git" (great book, by the way), and they seem to suggest that tracking branches are a good thing and that after creating your first remote (origin, in this case), you should set up your master branch to be a tracking branch, but it unfortunately doesn't cover why a tracking branch is a good thing or what benefits you get by setting up your master branch to be a tracking branch of your origin repository. Can someone please enlighten me (in English)?

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• jQuery get request against Sinatra does not get text

  - by jerhinesmith

  I have a very simple sinatra site that I'm trying to access via ajax through jQuery. To keep things incredibly simple, this code snippet: get '/behavior_count' do "60" end which returns "60" in the browser, shows up as an empty string when attempting to access the site via $.get in jQuery. The strange part is in Firebug, while the Response is empty, the HTTP header correctly describes Content-Length as 2, and I can see the request show up on the server. Is there something specific to Sinatra that isn't returning my data, or am I not using jQuery correctly? If it helps, I also tried this code: get '/behavior_count' do content_type 'text/plain', :charset => 'utf-8' "60" end and my jQuery looks like $.get('http://mysite:4567/behavior_count'); // Ignore the response, but // watch the request in firebug Any ideas?

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