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今天在公司測試Linux bridge搭建，為了使內部docker容器的網絡能夠不經過2層封裝轉發對外公布，顧試用一下bridge功能，結果碰到報錯："Bringing up interface eno16777736: Error: Connection activation failed: Master connection not found or invalid"
具體錯誤是：
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.
經過一番google，得出答案是得禁用NetworkManager。
執行如下命令：
systemctl stop NetworkManager systemctl disable NetworkManager
你可以選擇重啟，或者僅單單重啟network服務即可修復。
啟用后效果：
# brctl show bridge name bridge id STP enabled interfaces br0 8000.000c295f4d67 yes eno16777736
參考資料：
https://www.centos.org/forums/viewtopic.php?f=50&t=51000
本文到此結束，謝謝！
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