ruby-on-rails - Capistrano 3 丢弃 :user variable when executing remote SSH command

Question

试图从头开始测试 Capistrano。

头文件:

require 'capistrano/setup'
require 'capistrano/deploy'
I18n.enforce_available_locales = false
Dir.glob('lib/capistrano/tasks/*.rb').each { |r| import r }

部署.rb:

role :testrole, 'x.x.x.x'
set :user, 'ubuntu'

test.rb 任务:

namespace :test do
desc "Uptime on servers"
task :uptime do
  on roles(:testrole) do
    execute "uptime" 
  end
end
 end

帽命令:

cap production test:uptime

输出:

INFO [c077da7f] Running /usr/bin/env uptime on x.x.x.x
DEBUG [c077da7f] Command: /usr/bin/env uptime
cap aborted!
Net::SSH::AuthenticationFailed

使用相同的用户和 key 从 shell 登录没有问题。
登录远程服务器时，我可以在 auth.log 中看到执行上限时给出的空用户:

test-srv sshd[1459]: Invalid user  from x.x.x.x

我想念什么？
谢谢!

Answer 1

如果您查看在 cap install 项目时提供的示例代码，您将在 staging.rb 和 production.rb 中看到类似的内容:

# Simple Role Syntax
# ==================
# Supports bulk-adding hosts to roles, the primary
# server in each group is considered to be the first
# unless any hosts have the primary property set.
# Don't declare `role :all`, it's a meta role
role :app, %w{deploy@example.com}
role :web, %w{deploy@example.com}
role :db,  %w{deploy@example.com}

# Extended Server Syntax
# ======================
# This can be used to drop a more detailed server
# definition into the server list. The second argument
# something that quacks like a hash can be used to set
# extended properties on the server.
server 'example.com', user: 'deploy', roles: %w{web app}, my_property: :my_value

您要么想在这些地方之一指定您的用户，要么使用 fetch(:user) 在运行时以编程方式获取它。例如。，

server 'example.com', user: fetch(:user), roles: %w{web app}, my_property: :my_value