本文介绍了一种使用Python脚本结合云平台API实现定时为指定实例UUID的云服务器创建快照的方法。通过配置cron表达式来定义执行频率，利用os模块执行系统命令将计划任务写入文件中。
#!/usr/bin/python
import os
from nova import utils
lines=[]
file_path="/tmp/test.log"
instance_uuid="12345678"
snapshot_name="ttedow"
minute="*/1"
hour="1"
day="2"
month="3"
week="2"
schedule=' '.join([minute,hour,day,month,week])
bin_path=os.path.join('/usr/bin/',"nova")
lines.append(' '.join([schedule,bin_path,"image-create",instance_uuid,snapshot_name]))
strc=''.join(lines)
#string="python is cool"
cmd="echo "+strc + '>>' +file_path
os.system(cmd)
print file_path
print strc
import os
from nova import utils
lines=[]
file_path="/tmp/test.log"
instance_uuid="12345678"
snapshot_name="ttedow"
minute="*/1"
hour="1"
day="2"
month="3"
week="2"
schedule=' '.join([minute,hour,day,month,week])
bin_path=os.path.join('/usr/bin/',"nova")
lines.append(' '.join([schedule,bin_path,"image-create",instance_uuid,snapshot_name]))
strc=''.join(lines)
#string="python is cool"
cmd="echo "+strc + '>>' +file_path
os.system(cmd)
print file_path
print strc
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