将不同的参数传递给Fabric中的不同主机 [英] Passing different arguments to different hosts in Fabric
问题描述
我正在编写一个脚本，以在多个主机上启动负载生成实验.我可以编写一个bash脚本来启动多个ssh会话，但是我希望使用更结构化的东西.由于我在大多数脚本编写过程中都使用Python，因此我认为 Fabric 看起来是个不错的选择.
I am writing a script to launch a load generation experiment on several hosts. I could write a bash script to start multiple ssh sessions, but I was hoping to use something more structured. Since I use Python for most of my scripting, I thought Fabric looked like a good option.
唯一的问题是我需要在每个命令中传递少量的主机特定数据(实际上只是一个ID或计数器)，并且我想并行运行它们.
The only problem is that I need to pass a small amount of host specific data with each command (really just an id or counter), and I would like to run them in parallel.
换句话说，我想执行以下操作，其中每个主机的host_num不同(可能只是增加).
In other words, I would like to do something like the following, where host_num is different (possibly just incremented) for each host.
@parallel
def launch():
with cd('/working/dir'):
run("./start/script -id=%d", host_num)
在Fabric中这可能吗?如果没有，我还有其他工具可以用来完成相同的事情吗?
Is this possible in Fabric? If not, is there another tool I could use to accomplish the same thing?
推荐答案
您可以检查用户/主机.每个任务都知道他们当前在其中运行的环境:
You could check against user / host. Each task knows about environment they currently run in:
env.hosts = ['user@host1.com', 'user@host2.com']
@task
def test():
print '%(user)s@%(host)s' % (env)
if env.host == 'host1.com':
id = 1
elif ...
run('echo "%s"' % (id))
可以用一种更加优雅的方式随意编写它:)(一个建议是字典，用于id查找的情况类似于case语句)
Feel free to write it in more elegant way :) (one suggestion being dictionaries used similar to case statements for the id lookup)
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