openstack neutron-plugin-openvswitch-agent start 报错

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本文记录了在Ubuntu12.04系统中使用Neutron组件时遇到的日志错误，详细描述了错误信息及解决步骤。通过配置neutron.conf文件中的root_helper参数，成功解决了因sudo权限问题导致的ovs-vsctl命令执行失败。

版本Ubuntu 12.04 Icehouse

/var/log/neutron/openvswitch-agent.log

Stderr: 'sudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: 3 incorrect password attempts\n'

2015-12-18 15:06:45.459 28397 ERROR neutron.agent.linux.ovs_lib [-] Unable to execute ['ovs-vsctl', '--timeout=10', '--', 'set-fail-mode', 'br-int', 'secure']. Exception:
Command: ['sudo', 'ovs-vsctl', '--timeout=10', '--', 'set-fail-mode', 'br-int', 'secure']
Exit code: 1
Stdout: ''
Stderr: 'sudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: 3 incorrect password attempts\n'
2015-12-18 15:06:45.459 28397 CRITICAL neutron [-]
Command: ['sudo', 'ovs-vsctl', '--timeout=10', '--', 'set-fail-mode', 'br-int', 'secure']
Exit code: 1
Stdout: ''
Stderr: 'sudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: no tty present and no askpass program specified\nSorry, try again.\nsudo: 3 incorrect password attempts\n'

ERROR neutron.agent.linux.ovs_lib [-] Unable to execute ['ovs-vsctl', '--timeout=10'

解决办法：

/etc/neutron/neutron.conf

添加如下：

[agent]
root_helper = sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf