** Changed in: neutron
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1202722
Title:
Caught Exception in dhcp agent sync_state may block or delay
configuration of new networks
Status in OpenStack Neutron (virtual network service):
Fix Released
Bug description:
In the dhcp-agent.log, sometimes this error is seen.
Dhcp_agent.ini is configured with no router_id defined. There is one dhcp
agent managing all dhcp servers in one node.
This is the Traceback:
2013-07-10 16:16:15 ERROR [quantum.agent.dhcp_agent] Unable to sync network
state.
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/quantum/agent/dhcp_agent.py", line
152, in sync_state
self.disable_dhcp_helper(deleted_id)
File "/usr/lib/python2.7/dist-packages/quantum/agent/dhcp_agent.py", line
197, in disable_dhcp_helper
self.disable_isolated_metadata_proxy(network)
File "/usr/lib/python2.7/dist-packages/quantum/agent/dhcp_agent.py", line
340, in disable_isolated_metadata_proxy
pm.disable()
File
"/usr/lib/python2.7/dist-packages/quantum/agent/linux/external_process.py",
line 67, in disable
ip_wrapper.netns.execute(cmd)
File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line
407, in execute
check_exit_code=check_exit_code)
File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/utils.py", line
61, in execute
raise RuntimeError(m)
RuntimeError:...
The dhcp_agent.py in commit 1bd456371f9909d5cb33536e84a3fdd7aac40f8c shows:
def sync_state(self):
"""Sync the local DHCP state with Neutron."""
LOG.info(_('Synchronizing state'))
pool = eventlet.GreenPool(cfg.CONF.num_sync_threads)
known_network_ids = set(self.cache.get_network_ids())
try:
active_networks = self.plugin_rpc.get_active_networks_info()
active_network_ids = set(network.id for network in
active_networks)
for deleted_id in known_network_ids - active_network_ids:
self.disable_dhcp_helper(deleted_id)
for network in active_networks:
pool.spawn_n(self.configure_dhcp_for_network, network)
except Exception:
self.needs_resync = True
LOG.exception(_('Unable to sync network state.'))
When an error happens in the loop of the self.disable_dhcp_helper routine,
all networks in the "for network in active_networks" loop will be skipped. So
either the configuration of dhcp of network will either be delayed or will
never happen.
This routine touches many networks in a system. So any error
exceptions should be caught inside disable_dhcp_helper() so that
processing of other networks are not blocked -- for any exceptions,
bugs or not.
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