Python 结构嵌套角色

Question

我想了解如何在 fabric 中使用嵌套的 roledefs。 It写着，

Role definitions are not necessary configuration of hosts only, but could hold other role specific settings of your choice. This is achieved by defining the roles as dicts and host strings under a hosts key

我的配置是这样的

from fabric.api import env
env.roledefs = {
    'prod': {
        'hosts': ['prod1', 'prod2', 'prod3'],
        'db': ['db1']
    },
}

我的问题是如何为特定任务访问 db。

@roles('db') or @roles('prod')  #<- not sure what to add here
def migrate():
    # migration stuff
    pass

Answer 1

我的建议:

roles = {'prod': {'hosts': ['node1', 'node2'], 'db': ['node3']}
         'test': {'hosts': ['test1'], 'db': ['test2']}}

def migrate(role='test'):
    env.roledefs = roles[role]
    execute(_run_prepare)
    execute(_run_migrate)

@roles('hosts', 'db')
def _run_prepare():
    pass # runs on hosts in role "hosts" and hosts in role "db"

@roles('db')
def _run_migrate():
    pass # runs on hosts in role "db"