Question

这是我的脚本：

from fabric2 import Connection

c = Connection('127.0.0.1')
with c.cd('/home/bussiere/'):
    c.run('ls -l')

但是我有这个错误：

paramiko.ssh_exception.AuthenticationException: Authentication failed.

那么我如何在localhost上运行命令？

Answer 1

在Fabric2中，Connection对象具有一个local()方法。看一下该对象的文档here。

Answer 2

从2020年7月开始，使用fabric2，如果默认情况下您不将参数传递给任务装饰器，则您位于本地计算机上。

例如，以下内容将在本地计算机（本地主机）上运行：

示例1：仅在本地

#python3
#fabfile.py


from fabric import task, Connection
c = Connection('remote_user@remote_server.com')


@task
def DetailList(c):
    c.run('ls -l') # will run on local server because the decorator @task does not contain the hosts parameter

然后您将使用

在计算机上运行它

fab DetailList

如果要混合应在远程服务器和本地服务器上运行的代码，则应将连接作为参数传递给@task装饰器。

示例2：在本地和远程（但功能不同）

#python3
#fabfile.py

#imports
from fabric import task, Connection

#variables
list_of_hosts = ['user@yourserver.com'] #you should have already configure the ssh access
c = Connection(list_of_hosts[0])

working_dir = '/var/www/yourproject'

#will run on remote
@task(hosts = list_of_hosts)
def Update(c):
    c.run('sudo apt get update') # will run on remote server because hosts are passed to the task decorator
    c.run(f'cd {working_dir} && git pull') # will run on remote server because hosts are passed to the task decorator
    c.run('sudo service apache2 restart') # will run on remote server because hosts are passed to the task decorator

#will run on local because you do not specify a host
@task
def DetailsList(c):
    c.run('ls -l') # # will run on local server because hosts are NOT passed to the task decorator

如Ismaïl所述，在传递hosts参数时，也可以使用“本地”方法，尽管您已将host参数指定给任务装饰器，但“ local”方法将在本地主机上运行。请注意，如果未指定任何主机参数，则不能使用'local'方法，请改为使用run，如示例1和2所示。

示例3：在远程和本地服务器上同时使用，但是在相同的功能下，请注意，我们并未修饰UpdateAndRestart函数中调用的函数。


#python3
#fabfile.py

#imports
from fabric import task, Connection

#variables
list_of_hosts = ['www.yourserver.com'] #you should have already configure the ssh access
c = Connection(list_of_hosts[0])
working_dir = '/var/www/yourproject'


def UpdateServer(c):
    c.run('sudo apt get update') # will run on remote server because hosts are passed to the task decorator
    c.local('echo the remote server is now updated') # will run on local server because you used the local method when hosts are being passed to the decorator


def PullFromGit(c):
    c.run(f'cd {working_dir} && git pull')  # will run on remote server because hosts are passed to the task decorator
    c.local('echo Git repo is now pulled')   # will run on local server because you used the local method when hosts are being passed to the decorator


def RestartServer(c):
    c.run('sudo service apache2 restart') # will run on remote server because hosts are passed to the task decorator
    c.local('echo Apache2 is now restarted') # will run on local server because you used the local method when hosts are being passed to the decorator

    
@task(hosts = list_of_hosts)
def UpdateAndRestart(c):
    UpdateServer(c)
    PullFromGit(c)
    RestartServer(c)
    c.local('echo you have updated, pulled and restarted Apache2') # will run on local server because you used the local method when hosts are being passed to the decorator

您将可以使用：

运行整个堆栈

fab UpdateAndRestart

如何使用fabric2在本地主机上启动命令？

2 个答案: