def userproduct_post_save(sender, instance, created, **kwargs):
"""create ssh user at every ssh server ,
when add ssh user or change ssh user.
"""
sshuser = instance.sshuser
sshpwd = instance.sshpwd
expired_date = instance.expired_date
if created: # new created
if sshuser and sshpwd and expired_date: # not up.save() for getting UserProduct id
# create new ssh on all ssh servers
ssh_util = SSHUtil(instance.user)
ssh_info_list = [(sshuser, sshpwd, expired_date)]
ssh_util.ssh_create_onall(ssh_info_list)
else: # not created
#change ssh password on all ssh servers
ssh_util = SSHUtil(instance.user)
if sshuser and sshpwd: # change password
ssh_util.ssh_change_pwd_onall(sshuser, sshpwd)
if expired_date: # change expired date
ssh_util.ssh_change_expire_onall(sshuser, expired_date)
