fabric执行在后台运行的命令

最近一个项目需要用30个左右的jmeter客户端来做压力测试，需要做一些部署和配置工作，这时我喜欢的Fabric就可以发挥它的力量了。其中，我希望将jmeter施压段放到后台去运行，最开始将“nohup xxx &”放到fabric的run()中执行时，却没有执行；后来看了下文档，并做了些实验。

对于直接使用“&”放到后台执行的情况，Fabric推荐使用如下3种情况来替代（按鲁棒性从高到低排列）：
1.使用已经存在daemon技术，如init、supervisord、upstart、systemd等，例如：/etc/init.d/tomcat restart 这样的命令，另外supervisord我也是很喜欢的。
2.使用screen、tmux、dtach等工具来从当前shell中detach进程。如：screen -d -m sleep 10 这样的命令。注：要设置pty=False，如 run('screen -d -m sleep 10', pty=False)。
3.使用nohup，不过确实如官方文档所说只有部分用户能成功，我用nohup在run()中时就遇到了问题后该用screen了。

共享一个前几天写的jmeter相关的fabfile吧： https://github.com/smilejay/python/blob/master/py2015/unified_order_fabfile.py

#!/usr/bin/env python
# a fabfile to manange the performance test for unified order project.
# usage: fab -f unified_order_fabfile.py start_jmeter -P -z 30
# author: Jay <smile665@gmail.com>

from fabric.context_managers import cd
from fabric.operations import run, put
from fabric.api import task, env

env.hosts = ['192.168.1.2', '192.168.1.3', '192.168.1.4']
env.port = 22
env.user = 'root'
env.password = '123456'


@task
def hostname():
    # show hostname   # just for testing
    with cd('/tmp'):
        run('hostname')


@task
def copy_jmeter():
    # copy jmeter to other machines
    with cd('/tmp'):
        run('rm -rf jakarta-jmeter-2.3.4')
        put('jakarta-jmeter-2.3.4', '/tmp/')
        run('cd jakarta-jmeter-2.3.4/bin; chmod a+x jmeter')
        #run('ls /tmp/')


@task
def start_jmeter():
    # run jmeter in all test clients
    #with cd('/tmp/'):
    with cd('/tmp/jakarta-jmeter-2.3.4/bin/'):
        run('screen -d -m ./jmeter -n -t my-order.jmx -l log.jtl &>abc.log')
        #run('./jmeter -n -t unified-order.jmx -l log.jtl &>abc.log')
        #run('screen -d -m sleep 10', pty=False)
        #run('service tomcat start', pty=False)


@task
def kill_jmeter():
    # kill the jmeter processes for unified order project
    with cd('/tmp/'):
        pids = run("ps -ef | grep unified | grep -v 'grep' | awk '{print $2'}")
        pid_list = pids.split('\r\n')
        for i in pid_list:
            run('kill -9 %s' % i)


@task
def get_status():
    # get jmeter(java) running status
    with cd('/tmp'):
        run('ps -ef | grep unified | grep java | grep -v grep')

#!/usr/bin/env python

# a fabfile to manange the performance test for unified order project.

# usage: fab -f unified_order_fabfile.py start_jmeter -P -z 30

# author: Jay <smile665@gmail.com>

from fabric.context_managers import cd

from fabric.operations import run, put

from fabric.api import task, env

env.hosts = ['192.168.1.2', '192.168.1.3', '192.168.1.4']

env.port = 22

env.user = 'root'

env.password = '123456'

@task

def hostname():

# show hostname # just for testing

with cd('/tmp'):

run('hostname')

@task

def copy_jmeter():

# copy jmeter to other machines

with cd('/tmp'):

run('rm -rf jakarta-jmeter-2.3.4')

put('jakarta-jmeter-2.3.4', '/tmp/')

run('cd jakarta-jmeter-2.3.4/bin; chmod a+x jmeter')

#run('ls /tmp/')

@task

def start_jmeter():

# run jmeter in all test clients

#with cd('/tmp/'):

with cd('/tmp/jakarta-jmeter-2.3.4/bin/'):

run('screen -d -m ./jmeter -n -t my-order.jmx -l log.jtl &>abc.log')

#run('./jmeter -n -t unified-order.jmx -l log.jtl &>abc.log')

#run('screen -d -m sleep 10', pty=False)

#run('service tomcat start', pty=False)

@task

def kill_jmeter():

# kill the jmeter processes for unified order project

with cd('/tmp/'):

pids = run("ps -ef | grep unified | grep -v 'grep' | awk '{print $2'}")

pid_list = pids.split('\r\n')

for i in pid_list:

run('kill -9 %s' % i)

@task

def get_status():

# get jmeter(java) running status

with cd('/tmp'):

run('ps -ef | grep unified | grep java | grep -v grep')

参考文档：http://fabric.readthedocs.org/en/1.6/faq.html

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