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今天在公司测试Linux bridge搭建，为了使内部docker容器的网络能够不经过2层封装转发对外公布，顾试用一下bridge功能，结果碰到报错："Bringing up interface eno16777736: Error: Connection activation failed: Master connection not found or invalid"
具体错误是：
Mar 16 10:56:04 cloud01 systemd[1]: Starting LSB: Bring up/down networking... Mar 16 10:56:05 cloud01 network[876]: Bringing up loopback interface: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo‘ Mar 16 10:56:05 cloud01 network[876]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo‘ Mar 16 10:56:06 cloud01 network[876]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo‘ Mar 16 10:56:06 cloud01 network[876]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo‘ Mar 16 10:56:06 cloud01 network[876]: [ OK ] Mar 16 10:56:06 cloud01 network[876]: Bringing up interface eno16777736: Error: Connection activation failed: Master connection not found or invalid Mar 16 10:56:06 cloud01 network[876]: [FAILED] Mar 16 10:56:06 cloud01 network[876]: Bringing up interface br0: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-br0‘ Mar 16 10:56:06 cloud01 network[876]: Could not load file ‘/etc/sysconfig/network-scripts/ifcfg-br0‘ Mar 16 10:56:14 cloud01 network[876]: Determining IP information for br0... failed; no link present. Check cable? Mar 16 10:56:14 cloud01 network[876]: [FAILED] Mar 16 10:56:14 cloud01 systemd[1]: network.service: control process exited, code=exited status=1 Mar 16 10:56:14 cloud01 systemd[1]: Failed to start LSB: Bring up/down networking. Mar 16 10:56:14 cloud01 systemd[1]: Unit network.service entered failed state.
经过一番google，得出答案是得禁用NetworkManager。
执行如下命令：
systemctl stop NetworkManager systemctl disable NetworkManager
你可以选择重启，或者仅单单重启network服务即可修复。
启用后效果：
# brctl show bridge name bridge id STP enabled interfaces br0 8000.000c295f4d67 yes eno16777736
参考资料：
https://www.centos.org/forums/viewtopic.php?f=50&t=51000
本文到此结束，谢谢！
CentOS 7.1 Bridge启用STP报错"Master connection not found or invalid"
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原文地址：http://www.cnblogs.com/highend/p/centos7-1_bridge_enable_STP.html
