Ruby-on-rails 无法启动独角兽，master启动失败，查看stderr日志了解详情
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Can't start unicorn, master failed to start, check stderr log for details
提问by Pravin Mishra
I dont know what's wrong with the unicorn.rb file. my unicorn.rb config is
我不知道 unicorn.rb 文件有什么问题。我的 unicorn.rb 配置是
APP_PATH = "/var/www/demo"
working_directory APP_PATH
stderr_path APP_PATH + "/log/unicorn.stderr.log"
stdout_path APP_PATH + "/log/unicorn.stderr.log"
pid APP_PATH + "/tmp/pid/unicorn.pid"
running nginx successful.
运行nginx成功。
sudo servier nginx start
sudo unicorn -c /var/www/demo/config/unicorn.rb -D
回答by Frank C. Schuetz
The socket is the "file" that nginx and unicorn use as a channel for all communication between them. Where have you defined it? In our unicorn configs, we usually have a line like this:
套接字是 nginx 和 unicorn 用作它们之间所有通信的通道的“文件”。你在哪里定义的？在我们的独角兽配置中，我们通常有这样一行：
listen APP_PATH + "/tmp/pid/.unicorn.sock
Then, in your nginx.conf, you need to tell nginx about this socket, e.g.:
然后，在你的 nginx.conf 中，你需要告诉 nginx 这个套接字，例如：
upstream unicorn {
server unix:/var/www/demo/tmp/pid/.unicorn.sock fail_timeout=0;
}
location / {
root /var/www/demo/current/public ;
try_files $uri @unicorns;
}
location @unicorns {
proxy_pass http://unicorn;
}
In this config file, the first section defines how nginx can reach unicorn. The second one actually routes requests to an abstract location "@unicorns" which, in turn, is defined in the last section. This way you can reuse the @unicorns shorthand if your have more complex nginx routing going on.
在这个配置文件中，第一部分定义了 nginx 如何到达 unicorn。第二个实际上将请求路由到抽象位置“@unicorns”，而后者又在最后一节中定义。这样，如果您有更复杂的 nginx 路由，您可以重用 @unicorns 速记。
