今个也不前言了,直接切入主题 !
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同事在做一个关于方便的批量上线初始化的平台,其实我真不想说平台两个字,啥都平台,显得有些不时尚了 。 ansible是个好东西,只是上线打包初始化的任务太耗时间,经常是20分钟左右。这时候需要异步的执行,对于ansible来说,客户端把消耗时间的任务通过signal信号来处理,把结果扔到以jid为文件名的文件里。。。
(这两天写个用tornado 实现ansible的web ui)
原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
#xiaorui.cc import sys import time import ansible.runner runner = ansible.runner.Runner( module_name='shell', module_args=sys.argv[1], pattern='web', ) datastructure = runner.run_async(30) print datastructure print datastructure[1].poll() time.sleep(3) print datastructure[1].poll() time.sleep(3) print datastructure[1].poll() time.sleep(3) print datastructure[1].poll()
终端执行的结果:
[root@67 ~]# python cmd.py "sleep 6;echo 1111" ({'dark': {}, 'contacted': {'10.10.10.66': {u'started': 1, 'invocation': {'module_name': 'shell', 'module_args': 'sleep 6;echo 1111'}, u'results_file': u'/root/.ansible_async/637134991839', u'ansible_job_id': u'637134991839'}}},) {'dark': {}, 'polled': {'10.10.10.66': {u'started': 1, 'invocation': {'module_name': 'async_status', 'module_args': u'jid=637134991839'}, u'results_file': u'/root/.ansible_async/637134991839', u'ansible_job_id': u'637134991839', u'changed': False}}, 'contacted': {}} {'dark': {}, 'polled': {'10.10.10.66': {u'started': 1, 'invocation': {'module_name': 'async_status', 'module_args': u'jid=637134991839'}, u'results_file': u'/root/.ansible_async/637134991839', u'ansible_job_id': u'637134991839', u'changed': False}}, 'contacted': {}} {'dark': {}, 'polled': {}, 'contacted': {'10.10.10.66': {u'changed': True, u'end': u'2014-06-05 07:06:19.426764', u'ansible_job_id': u'637134991839', u'stdout': u'1111', u'cmd': u'sleep 6;echo 1111 ', 'invocation': {'module_name': 'async_status', 'module_args': u'jid=637134991839'}, u'start': u'2014-06-05 07:06:13.420793', u'finished': 1, u'stderr': u'', u'rc': 0, u'delta': u'0:00:06.005971'}}} {'dark': {}, 'polled': {}, 'contacted': {'10.10.10.66': {u'changed': True, u'end': u'2014-06-05 07:06:19.426764', u'ansible_job_id': u'637134991839', u'stdout': u'1111', u'cmd': u'sleep 6;echo 1111 ', 'invocation': {'module_name': 'async_status', 'module_args': u'jid=637134991839'}, u'start': u'2014-06-05 07:06:13.420793', u'finished': 1, u'stderr': u'', u'rc': 0, u'delta': u'0:00:06.005971'}}}
原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
在运行的过程中,我强制中断主进程。
因为任务是fork到守候进程,所以任务还是被执行的。
[root@66 ~]# cat /root/.ansible_async/656009932164 {"changed": true, "end": "2014-06-05 07:10:15.741252", "stdout": "1111", "cmd": "sleep 10;echo 1111 ", "start": "2014-06-05 07:10:05.736109", "delta": "0:00:10.005143", "stderr": "", "rc": 0}
原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
想知道他是怎么异步的获取状态的么?
比起saltstack这种逆天的工具来说,ansible的返回值显得有点不时尚。
他的任务结果会输出到.ansible_aysnc的一个token文件里面的。然后你每次去poll任务,他都是拿着这个jid,然后ssh到客户端cat数据,然后把数据json.loads。
当执行异步任务的时候,我监控了22端口的行为数据。
配合上面的python调用ansible api 的那个脚本
T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.66:22 -> 10.10.10.67:33046 [A] T 10.10.10.67:33046 -> 10.10.10.66:22 [A] T 10.10.10.67:33046 -> 10.10.10.66:22 [A] T 10.10.10.67:33046 -> 10.10.10.66:22 [A] T 10.10.10.67:33046 -> 10.10.10.66:22 [A] T 10.10.10.67:33046 -> 10.10.10.66:22 [AR xiaorui.cc
进程的监控,会看到我每次poll数据的时候,都是派生了一个新进程。
[root@66 /var]# ps aux|grep python root 1216 0.0 1.9 74456 20392 ? Sl 06:18 0:04 /usr/bin/python /usr/bin/salt-minion -d root 6251 0.0 0.2 9312 2512 ? S 07:45 0:00 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/async_wrapper 701347917770 30 /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/command /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/arguments root 6252 0.0 0.2 9312 2784 ? S 07:45 0:00 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/async_wrapper 701347917770 30 /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/command /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/arguments root 6253 2.0 0.6 15000 6376 ? S 07:45 0:00 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/command /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/ar
看看客户端的那几个临时文件
[root@66 ansible-tmp-1401896171.16-200148091205946]# ll 总用量 60 #xiaorui.cc -rw-r--r--. 1 root root 28 6月 5 07:43 arguments -rw-r--r--. 1 root root 6159 6月 5 07:43 async_wrapper -rwxr-xr-x. 1 root root 47795 6月 5 07:43 command [root@66 ansible-tmp-1401896171.16-200148091205946]#
原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
command是模块,用来执行linux命令的。argument文件里面是给command传递的参数,async_wrapper这个是关键。 是这次任务能异步起来的核心文件。
原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
看这段代码可以看出ansible使用异步的时候,所采用的一些方法。
看了这个脚本,在结合上线咱们ps aux抓到的正在执行的ansible过来的ssh执行的命令。
/usr/bin/python /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/async_wrapper 701347917770 30 /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/command /root/.ansible/tmp/ansible-tmp-1401896304.86-33623655469433/arguments
给async_wrapper传递了四个参数,jid,超时的时间,引用的模块,传递给模块的参数。 jid给aysnc_wrapper,是为了把结果序列化json存入到jid文件里面。给的时间,是用来通过signal信号做超时的限制 ! 模块和参数就不讲了,你应该懂!
#!/usr/bin/python # -*- coding: utf-8 -*- try: import json except ImportError: import simplejson as json import shlex import os import subprocess import sys import datetime import traceback import signal import time import syslog def daemonize_self(): # daemonizing code: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012 # logger.info("cobblerd started") try: pid = os.fork() if pid > 0: # exit first parent sys.exit(0) except OSError, e: print >>sys.stderr, "fork #1 failed: %d (%s)" % (e.errno, e.strerror) sys.exit(1) # decouple from parent environment os.chdir("/") os.setsid() os.umask(022) # do second fork try: pid = os.fork() if pid > 0: # print "Daemon PID %d" % pid sys.exit(0) except OSError, e: print >>sys.stderr, "fork #2 failed: %d (%s)" % (e.errno, e.strerror) sys.exit(1) dev_null = file('/dev/null','rw') os.dup2(dev_null.fileno(), sys.stdin.fileno()) os.dup2(dev_null.fileno(), sys.stdout.fileno()) os.dup2(dev_null.fileno(), sys.stderr.fileno()) if len(sys.argv) < 3: print json.dumps({ "failed" : True, "msg" : "usage: async_wrapper. Humans, do not call directly!" }) sys.exit(1) jid = sys.argv[1] time_limit = sys.argv[2] wrapped_module = sys.argv[3] argsfile = sys.argv[4] cmd = "%s %s" % (wrapped_module, argsfile) syslog.openlog('ansible-%s' % os.path.basename(__file__)) syslog.syslog(syslog.LOG_NOTICE, 'Invoked with %s' % " ".join(sys.argv[1:])) # setup logging directory logdir = os.path.expanduser("~/.ansible_async") log_path = os.path.join(logdir, jid) if not os.path.exists(logdir): try: os.makedirs(logdir) except: print json.dumps({ "failed" : 1, "msg" : "could not create: %s" % logdir }) def _run_command(wrapped_cmd, jid, log_path): logfile = open(log_path, "w") logfile.write(json.dumps({ "started" : 1, "ansible_job_id" : jid })) logfile.close() logfile = open(log_path, "w") result = {} outdata = '' try: cmd = shlex.split(wrapped_cmd) script = subprocess.Popen(cmd, shell=False, stdin=None, stdout=logfile, stderr=logfile) script.communicate() outdata = file(log_path).read() result = json.loads(outdata) except (OSError, IOError), e: result = { "failed": 1, "cmd" : wrapped_cmd, "msg": str(e), } result['ansible_job_id'] = jid logfile.write(json.dumps(result)) except: result = { "failed" : 1, "cmd" : wrapped_cmd, "data" : outdata, # temporary debug only "msg" : traceback.format_exc() } result['ansible_job_id'] = jid logfile.write(json.dumps(result)) logfile.close() # immediately exit this process, leaving an orphaned process # running which immediately forks a supervisory timing process #import logging #import logging.handlers #logger = logging.getLogger("ansible_async") #logger.setLevel(logging.WARNING) #logger.addHandler( logging.handlers.SysLogHandler("/dev/log") ) def debug(msg): #logger.warning(msg) pass try: pid = os.fork() if pid: # Notify the overlord that the async process started # we need to not return immmediately such that the launched command has an attempt # to initialize PRIOR to ansible trying to clean up the launch directory (and argsfile) # this probably could be done with some IPC later. Modules should always read # the argsfile at the very first start of their execution anyway time.sleep(1) debug("Return async_wrapper task started.") print json.dumps({ "started" : 1, "ansible_job_id" : jid, "results_file" : log_path }) sys.stdout.flush() sys.exit(0) else: # The actual wrapper process # Daemonize, so we keep on running daemonize_self() # we are now daemonized, create a supervisory process debug("Starting module and watcher") sub_pid = os.fork() if sub_pid: # the parent stops the process after the time limit remaining = int(time_limit) # set the child process group id to kill all children os.setpgid(sub_pid, sub_pid) debug("Start watching %s (%s)"%(sub_pid, remaining)) time.sleep(5) while os.waitpid(sub_pid, os.WNOHANG) == (0, 0): debug("%s still running (%s)"%(sub_pid, remaining)) time.sleep(5) remaining = remaining - 5 if remaining <= 0: debug("Now killing %s"%(sub_pid)) os.killpg(sub_pid, signal.SIGKILL) debug("Sent kill to group %s"%sub_pid) time.sleep(1) sys.exit(0) debug("Done in kid B.") os._exit(0) else: # the child process runs the actual module debug("Start module (%s)"%os.getpid()) _run_command(cmd, jid, log_path) debug("Module complete (%s)"%os.getpid()) sys.exit(0) except Exception, err: debug("error: %s"%(err)) raise err 原文:http://rfyiamcool.blog.51cto.com/1030776/1422263
话说,ansible为了兼容别的语言,还真是做了不少的牺牲。一切都是各种标准输入输出的。。。。哎,如果把ansible api 的async处理方式用在ansible的web平台上,有些不合适。当然,你如果耗得起貌似都ssh过去,认证,执行,然后扔到async_wrapper文件里面的过程,那你.......(nx)。 话说ansible真的不快......你真的可以试试。。。。
建议大家看看ansible api的源码,实现下returners的方式。 同事已经实现了,其实很简单,有兴趣的朋友,可以在看看我上次的那个ansible runner源码的文章,肯定能找到思路。 还有大家也可以通过修改 async_wrapper的代码实现returner。 这两天有时间会写点 ansible做web平台上遇到的问题。