Containers outside Containers
What is a container? Most will probably answer something related to Docker. That’s a good guess, but docker only one, of many, wrappers that enables the illusion of what we call container.
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s3kup: the s3 backup tool
I’ve created a tool creating backups on a s3 bucket, I called it s3kup. It’s written in GO and very straightforward to use. It’s somehow a rewrite of an old ruby gem I had for the same purpose. It’s a command that can take any input from a shell pipeline and store it in a versioned way in a s3 bucket. s3kup has 3 basic commands: push, pull and list. Continue reading
Gemserver as a docker image
I’ve posted before about how to setup a private gemserver using geminabox, but I’ve just released a docker image that does the all the job:
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Speed up your bundler = personal rubygems proxy with cloudfront
If you think your bundle install takes too long, or have a distributed team around the globe, this may help you.
It’s possible to have a cloudfront server pointing to rubygems, and using it as your gems source server. (If you are not aware of what cloudfront is give a look at it)
On this configuration, cloudfront will fetch requests from rubygems.org, and keep
them cached on the CDN, so you should expect the first bundle install to take
very close time of using rubygems.org, but the second one and forward should have
some performance increase. You can also manually set the cache time there.
On a new cloudfront server, at the AWS console, add rubygems.org as origin:
I’m not a rubygems api expert, I’ve captured bundler requests and tried to cache them with “behaviours” on cloudfront. I’m also caching everything else for 10 minutes. These configurations probably can be tuned, drop a comment if you have suggestions :)
Things to have in mind:
- origin must match viewer’s protocol
- all the behaviours must forward query strings
On the Gemfile, you need to change the source to the new proxy server:
# Gemfile
source 'http://mycfdomain.cloudfront.net'
...
note: Theoretically https should work, but due some redirection it didn’t work for me.
Results
I’m using rvm gemset to reset scenarios between tests.
Using a rails 4 default gemfile:
- using rubygems.org:
bundle 6.37s user 1.59s system 21% cpu 37.840 total
- using cloudfront proxy (FIRST TIME, no cached content):
bundle 6.50s user 1.77s system 22% cpu 37.578 total
- using cloudfron proxy (with cached content):
bundle 6.35s user 1.60s system 30% cpu 25.664 total
Using “real-world” project Gemfile:
- using rubygems.org:
bundle 116.22s user 29.68s system 45% cpu 5:20.03 total
- using cloudfront proxy (FIRST TIME, no cached content):
bundle 112.99s user 29.69s system 44% cpu 5:23.24 total
- using cloudfron proxy (with cached content):
bundle 111.52s user 29.86s system 58% cpu 4:03.12 total
I think the difference on cached content is significative. It’s up to you to decide if it’s enough reason to pay a CF server for this.
Automatic git bisect
There are some situations that you found your build broken and need to know at what revision the “brokeness” was introduced.
git bisect is a great tool for that, basically you tell git at which revision
the build was good (assuming HEAD is broken), and it does a binary search for the revision where
the bug was introduced.
Build your own private gem server
With Bundler/Gemfile it’s easy to link gems directly to it’s git repository. But some times it’s not ideal. Revisions are not versions, and comparing them is tedious.
Luckly It’s easy to setup a private gem server!
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Complex constraints for rails routes
It’s possible to use a custom class as a constraint for your routes. For example:
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Keeping track of your deploys with capistrano and git
I’ve created a simple capistrano task to keep track of my deploys. When I deploy to a server, it will create a git tag and push it to origin. This way I can keep track of each deploy revision. after 'deploy:update_code', 'git:create_deploy_tag' namespace :git task :create_deploy_tag do puts "[git] creating new deploy tag" tag_name = "deploy--#{Time.now.strftime("%Y-%m-%d-%H-%M-%S")}" `git tag -a '#{tag_name}' -m 'Deploy: #{Time.now}' origin/production && git push origin --tags` end end p. Continue reading
Android: Camera and Image Gallery
Here is some simple steps to access the phone camera and image gallery. This will be a very simple app. There is only one view, it will hold 2 buttons for selecting the image (one from camera and another from the gallery) and a ImageView that will show the selected image. I’ll not talk about the layout here, what I did is ugly and looks like this:
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