我们在使用 unicorn 进行热部署时遇到了问题。我们几乎使用规范的 unicorn.rb
配置,设置working_directory
指向符号链接(symbolic link)的文件夹,但不知何故,它在第一次启动时似乎卡在实际文件夹上并且无法遵循符号链接(symbolic link)。
# config/unicorn.rb
if ENV['RAILS_ENV'] == 'production'
worker_processes 4
else
worker_processes 2
end
working_directory "/var/local/project/symlinkfolder"
# Listen on unix socket
listen "/tmp/unicorn.sock", :backlog => 64
pid "/var/run/unicorn/unicorn.pid"
stderr_path "/var/log/unicorn/unicorn.log"
stdout_path "/var/log/unicorn/unicorn.log"
preload_app true
before_fork do |server, worker|
# the following is highly recomended for Rails + "preload_app true"
# as there's no need for the master process to hold a connection
if defined?(ActiveRecord::Base)
ActiveRecord::Base.connection.disconnect!
end
# Before forking, kill the master process that belongs to the .oldbin PID.
# This enables 0 downtime deploys.
old_pid = "/var/run/unicorn/unicorn.pid.oldbin"
if File.exists?(old_pid) && server.pid != old_pid
begin
Process.kill("QUIT", File.read(old_pid).to_i)
rescue Errno::ENOENT, Errno::ESRCH
# someone else did our job for us
end
end
end
after_fork do |server, worker|
# the following is *required* for Rails + "preload_app true",
if defined?(ActiveRecord::Base)
ActiveRecord::Base.establish_connection
end
# this makes sure the logging-rails framework works when preload_app = true
Logging.reopen
# if preload_app is true, then you may also want to check and
# restart any other shared sockets/descriptors such as Memcached,
# and Redis. TokyoCabinet file handles are safe to reuse
# between any number of forked children (assuming your kernel
# correctly implements pread()/pwrite() system calls)
end
当我们发出
USR2
,我们在 unicorn 日志中看到了这一点:executing ["/var/local/project/project.d/6/vendor/bundle/ruby/1.9.1/bin/unicorn_rails", "-E", "staging", "-D", "-c", "/var/local/project/symlinkfolder/config/unicorn.rb"│·
, {12=>#<Kgio::UNIXServer:fd 12>}] (in /var/local/project/project.d/8)
所以 unicorn 在某种程度上“卡在”版本 6 上,而实际的符号链接(symbolic link)文件夹在版本 8 上……一旦我们在几次部署后为版本 6 修剪文件夹,这就会成为一个问题……
working_directory
设置为符号链接(symbolic link)文件夹 /var/local/project/project.d/[id]
文件夹正确 USR2
之前更新符号链接(symbolic link)信号 我们错过了什么??
最佳答案
解决方案是显式设置 unicorn 二进制路径,正如 http://unicorn.bogomips.org/Sandbox.html 上解释的(以某种令人困惑的方式)。
app_root = "/var/local/project/symlinkfolder"
working_directory app_root
# see http://unicorn.bogomips.org/Sandbox.html
Unicorn::HttpServer::START_CTX[0] = "#{app_root}/vendor/bundle/ruby/1.9.1/bin/unicorn_rails"
然后我们需要发出
unicorn reload
( kill -HUP
) 命令,所以 unicorn 重新加载配置文件。从那时起,发出 USR2
信号正常工作。
关于ruby-on-rails-3 - 带有符号链接(symbolic link)的 unicorn 工作目录,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15003063/