如何访问Capistrano中当前主机的角色？

Question

使用capistrano进行部署时，我想访问yml模板文件中的当前主机/远程计算机角色。

我尝试过的事情

• 我尝试进行实验以查看是否有一个host变量可用，但似乎没有任何作用。

  • $CAPISTRANO:HOST$似乎适用于较早版本的capistrano。

如何在模板化的yaml文件中执行类似此伪代码的操作？

production: app_name: <%= TODO: IF HOST A/b/c -- App 1. If host Z -- app 2 %>

Answer 1

From what I understand, I have handled a similar problem programatically.

As you may know for each environment there is a .rb file in the config/deploy/ directory.

In our problem, we had a YAML file that had host and role information, viz. below: A: - web - db - mongo B: - web - app

To apply this role specific to each host, we iterated over this YAML file (ruby has easy to follow instructions on that) and added a line of code. Here is the psuedocode:

for host in HOST_LIST_YAML do for role in ROLE_LIST do role :role, %w{USER@host} end end

Here, all the role mappings are applied to the hosts. Similarly, you can write this code on your environment.rb file.