[英]Automatic process monitoring/management with Python
是的,所以我有一個不斷運行的python進程,甚至在Supervisor上也可以。 實現以下監視的最佳方法是什么?
我想通過Python實現以上所有功能。 我知道Supervisord將完成大部分操作,但是我想看看它是否可以通過Python本身完成。
我認為您正在尋找的是Supervisor Events。 http://supervisord.org/events.html
還要看一下Superlance,它是一套插件實用程序,用於監視和控制在主管下運行的進程。 [ https://superlance.readthedocs.org/en/latest/]
您可以配置崩潰電子郵件,崩潰短信,內存消耗警報,HTTP掛鈎等內容。
好吧,如果您想要一個本地解決方案,這就是我能想到的。
保持進程狀態在Redis中處於實際狀態和預期狀態。 您可以通過使Web界面檢查實際狀態並更改預期狀態來以所需方式對其進行監視。
在crontab中運行python腳本以檢查狀態,並在需要時采取適當的措施。 在這里,我每3秒鍾檢查一次,並使用SES通過電子郵件提醒管理員。
免責聲明:該代碼尚未運行或測試。 我現在才寫,容易出錯。
打開crontab文件:
$crontab -e
在其末尾添加此行,以使run_process.sh每分鍾運行一次。
#Runs this process every 1 minute.
*/1 * * * * bash ~/path/to/run_monitor.sh
run_moniter.sh運行python腳本。 它每3秒在for循環中運行一次。
這樣做是因為crontab給出了1分鍾的最小時間間隔。 我們想每3秒檢查一次該過程20次(3秒* 20 = 1分鍾)。 因此它將運行一分鍾,然后crontab再次運行它。
run_monitor.sh
for count in {0..20}
do
cd '/path/to/check_status'
/usr/local/bin/python check_status.py "myprocessname" "python startcommand.py"
sleep 3 #check every 3 seconds.
done
我在這里假設:
*狀態0 =停止或停止(預期與實際)
*狀態-1 =重新啟動
*狀態1 =運行或正在運行
您可以根據需要添加更多狀態,過時的過程也可以是狀態。
我使用過進程名來殺死或啟動或檢查進程,您可以輕松地對其進行修改以讀取特定的PID文件。
check_status.py
import sys
import redis
import subprocess
import sys
import boto.ses
def send_mail(recipients, message_subject, message_body):
"""
uses AWS SES to send mail.
"""
SENDER_MAIL = 'xxx@yyy.com'
AWS_KEY = 'xxxxxxxxxxxxxxxxxxx'
AWS_SECRET = 'xxxxxxxxxxxxxxxxxxx'
AWS_REGION = 'xx-xxxx-x'
mail_conn = boto.ses.connect_to_region(AWS_REGION,
aws_access_key_id=AWS_KEY,
aws_secret_access_key=AWS_SECRET
)
mail_conn.send_email(SENDER_MAIL, message_subject, message_body, recipient, format='html')
return True
class Shell(object):
'''
Convinient Wrapper over Subprocess.
'''
def __init__(self, command, raise_on_error=True):
self.command = command
self.output = None
self.error = None
self.return_code
def run(self):
try:
process = subprocess.Popen(self.command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
self.return_code = process.wait()
self.output, self.error = process.communicate()
if self.return_code and self.raise_on_error:
print self.error
raise Exception("Error while executing %s::%s"%(self.command, self.error))
except subprocess.CalledProcessError:
print self.error
raise Exception("Error while executing %s::%s"%(self.command, self.error))
redis_client = redis.Redis('xxxredis_hostxxx')
def get_state(process_name, state_type): #state_type will be expected or actual.
state = redis.get('{process_name}_{state_type}_state'.format(process_name=process_name, state_type=state_type)) #value could be 0 or 1
return state
def set_state(process_name, state_type, state): #state_type will be expected or actual.
state = redis.set('{process_name}_{state_type}_state'.format(process_name=process_name, state_type=state_type), state)
return state
def get_stale_state(process_name):
state = redis.get('{process_name}_stale_state'.format(process_name=process_name)) #value could be 0 or 1
return state
def check_running_status(process_name):
command = "ps -ef|grep {process_name}|wc -l".format(process_name=process_name)
shell = Shell(command = command)
shell.run()
if shell.output=='0':
return False
return True
def start_process(start_command): #pass start_command with a '&' so the process starts in the background.
shell = Shell(command = command)
shell.run()
def stop_process(process_name):
command = "ps -ef| grep {process_name}| awk '{print $2}'".format(process_name=process_name)
shell = Shell(command = command, raise_on_error=False)
shell.run()
if not shell.output:
return
process_ids = shell.output.strip().split()
for process_id in process_ids:
command = 'kill {process_id}'.format(process_id=process_id)
shell = Shell(command=command, raise_on_error=False)
shel.run()
def check_process(process_name, start_command):
expected_state = get_state(process_name, 'expected')
if expected_state == 0: #stop
stop_process(process_name)
set_state(process_name, 'actual', 0)
else if expected_state == -1: #restart
stop_process(process_name)
set_state(process_name, 'actual', 0)
start_process(start_command)
set_state(process_name, 'actual', 1)
set_state(process_name, 'expected', 1) #set expected back to 1 so we dont keep on restarting.
elif expected_state == 1:
running = check_running_status(process_name)
if not running:
set_state(process_name, 'actual', 0)
send_mail(reciepients=["abc@admin.com", "xyz@admin.com"], message_subject="Alert", message_body="Your process is Down. Trying to restart")
start_process(start_command)
running = check_running_status(process_name)
if running:
send_mail(reciepients=["abc@admin.com", "xyz@admin.com"], message_subject="Alert", message_body="Your process is was restarted.")
set_state(process_name, 'actual', 1)
else:
send_mail(reciepients=["abc@admin.com", "xyz@admin.com"], message_subject="Alert", message_body="Your process is could not be restarted.")
if __name__ == '__main__':
args = sys.argv[1:]
process_name = args[0]
start_command = args[1]
check_process(process_name, start_command)
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