无法使用 capistrano 在端口 80 上启动独角兽答案

【问题标题】：Unable to start unicorn on port 80 using capistrano无法使用 capistrano 在端口 80 上启动独角兽
【发布时间】：2013-06-14 04:41:22
【问题描述】：

cap production unicorn:start 失败并出现以下错误，尝试在端口 80 上启动我的 rails 应用程序。

F, [2013-06-14T04:33:51.420113 #13986] FATAL -- : error adding listener addr=0.0.0.0:80
/home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/socket_helper.rb:147:in `initialize': Permission denied - bind(2) (Errno::EACCES)
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/socket_helper.rb:147:in `new'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/socket_helper.rb:147:in `bind_listen'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:229:in `listen'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:773:in `block in bind_new_listeners!'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:773:in `each'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:773:in `bind_new_listeners!'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/lib/unicorn/http_server.rb:141:in `start'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/gems/unicorn-4.6.2/bin/unicorn:126:in `<top (required)>'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/bin/unicorn:23:in `load'
from /home/ec2-user/apps/bdr_prod/shared/bundle/ruby/2.0.0/bin/unicorn:23:in `<main>'

设置 use_sudo true 返回以下错误

* executing "sudo -p 'sudo password: ' rm -rf /home/ec2-user/apps/bdr_prod/releases/20130517085418"
servers: ["64.433.69.129"]
[ec2-user@64.433.69.129] executing command
*** [err :: ec2-user@64.433.69.129] sudo
*** [err :: ec2-user@64.433.69.129] :
*** [err :: ec2-user@64.433.69.129] sorry, you must have a tty to run sudo
*** [err :: ec2-user@64.433.69.129] 
command finished in 1542ms

【问题讨论】：

你是从sudo开始的吗？
我正在通过 capistrano 进行部署，而不是手动执行此操作。 rvmsudo 是解决方案，不知道如何通过 cap 来实现
你不想让一个 web 服务器（nginx、apache）在 80 端口上运行并转发到另一个端口或独角兽的套接字吗？

标签： ruby-on-rails capistrano unicorn

【解决方案1】：

我之前遇到过这个问题，不得不将它添加到我的deploy.rb：

default_run_options[:pty] = true

【讨论】：

【解决方案2】：

要在远程服务器中运行 ssh sudo 命令，请在远程服务器中禁用“require tty”

运行：

~$ sudo visudo

编辑： /etc/sudoers

# 禁用“ssh hostname sudo”，因为它会显示密码清晰。

# 你必须运行“ssh -t hostname sudo”。

# 注释需要 tty

# 默认值要求

参考：http://www.lansweeper.com/kb/39/TTY-Required-error-during-linux-scanning.html

【讨论】：