问题描述
我的部署很慢,至少需要 3 分钟.部署期间 Capistrano 的缓慢任务是 assets:precompile.这可能需要 99% 的总部署时间.我怎样才能加快速度?我应该在我的本地机器上预编译我的资产并将它们添加到我的 git repo 中吗?
My deployments are slow, they take at least 3 minutes. The slow Capistrano task during deploy is assets:precompile. This takes probably 99% of the total deploy time. How can I speed this up? Should I precompile my assets on my local machine and add them to my git repo?
将 config.assets.initialize_on_precompile = false
添加到我的 application.rb 文件中,预编译时间减少了半分钟,但仍然很慢.
Adding config.assets.initialize_on_precompile = false
to my application.rb file dropped the precompile time with half a minute, but it is still slow.
推荐答案
这个想法是,如果你不改变你的资产,你就不需要每次都重新编译它们:
The idea is that if you don't change your assets you don't need to recompile them each time:
这是本柯蒂斯提出的解决方案 使用 git 进行部署:
This is the solution that Ben Curtis propose for a deployment with git:
namespace :deploy do
namespace :assets do
task :precompile, :roles => :web, :except => { :no_release => true } do
from = source.next_revision(current_revision)
if releases.length <= 1 || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}
else
logger.info "Skipping asset pre-compilation because there were no asset changes"
end
end
end
end
这是另一种基于资产年龄的方法(https://gist.github.com/2784462) :
Here is another approach based on asset age (https://gist.github.com/2784462) :
set :max_asset_age, 2 ## Set asset age in minutes to test modified date against.
after "deploy:finalize_update", "deploy:assets:determine_modified_assets", "deploy:assets:conditionally_precompile"
namespace :deploy do
namespace :assets do
desc "Figure out modified assets."
task :determine_modified_assets, :roles => assets_role, :except => { :no_release => true } do
set :updated_assets, capture("find #{latest_release}/app/assets -type d -name .git -prune -o -mmin -#{max_asset_age} -type f -print", :except => { :no_release => true }).split
end
desc "Remove callback for asset precompiling unless assets were updated in most recent git commit."
task :conditionally_precompile, :roles => assets_role, :except => { :no_release => true } do
if(updated_assets.empty?)
callback = callbacks[:after].find{|c| c.source == "deploy:assets:precompile" }
callbacks[:after].delete(callback)
logger.info("Skipping asset precompiling, no updated assets.")
else
logger.info("#{updated_assets.length} updated assets. Will precompile.")
end
end
end
end
如果你更喜欢在本地预编译你的资产,你可以使用这个任务:
If you prefer to precompile your assets locally you can use this task:
namespace :deploy do
namespace :assets do
desc 'Run the precompile task locally and rsync with shared'
task :precompile, :roles => :web, :except => { :no_release => true } do
from = source.next_revision(current_revision)
if releases.length <= 1 || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0
%x{bundle exec rake assets:precompile}
%x{rsync --recursive --times --rsh=ssh --compress --human-readable --progress public/assets #{user}@#{host}:#{shared_path}}
%x{bundle exec rake assets:clean}
else
logger.info 'Skipping asset pre-compilation because there were no asset changes'
end
end
end
end
另一种有趣的方法是使用 git 钩子.例如,您可以将此代码添加到 .git/hooks/pre-commit
中,它会检查资产文件中是否存在任何差异,并最终预编译它们并将它们添加到当前提交中.
Another interesting approach can be that of using a git hook.For example you can add this code to .git/hooks/pre-commit
which checks if there are any differences in the assets files and eventually precompiles them and add them to the current commit.
#!/bin/bash
# source rvm and .rvmrc if present
[ -s "$HOME/.rvm/scripts/rvm" ] && . "$HOME/.rvm/scripts/rvm"
[ -s "$PWD/.rvmrc" ] && . "$PWD/.rvmrc"
# precompile assets if any have been updated
if git diff-index --name-only HEAD | egrep '^app/assets' >/dev/null ; then
echo 'Precompiling assets...'
rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
git add public/assets/*
fi
如果您决定使用这种方法,您可能需要更改您的 config/environments/development.rb
添加:
If you decide to use this approach you would probably need to change your config/environments/development.rb
adding:
config.assets.prefix = '/assets_dev'
这样,在开发过程中,您就不会提供预编译资产.
So that while in development you won't serve the precompiled assets.
这篇关于加速资产:使用 Rails 3.1/3.2 Capistrano 部署进行预编译的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!