[Linux] 解決 CentOS7 上 network service 無法啟動的問題
今天想要重啟 CentOS 7 上的 network service，於是執行了 systemctl restart network，
卻遇到了奇怪的問題，一直會出現啟動失敗的訊息…
root@localhost ~ # systemctl restart network Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.
如果用 systemctl status network 去看狀態的話，會看到
Failed to start LSB: Bring up/down networking 的錯誤訊息：
root@localhost ~ # systemctl status network network.service - LSB: Bring up/down networking Loaded: loaded (/etc/rc.d/init.d/network) Active: failed (Result: exit-code) since Mon 2015-09-14 12:53:12 CST; 2s ago Process: 3752 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE) Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost network[3752]: RTNETLINK answers: File exists Sep 14 12:53:12 localhost systemd[1]: network.service: control process exited, code=exited status=1 Sep 14 12:53:12 localhost systemd[1]: Failed to start LSB: Bring up/down networking. Sep 14 12:53:12 localhost systemd[1]: Unit network.service entered failed state.
弄了蠻久的時間，終於從 CentOS 7/RHEL 7 网卡启动错误 這篇找到線索～
原來我記在 /etc/sysconfig/network-scripts/ifcfg-em1 的網卡 MAC address 有誤，
所以服務一直起不來…
ifcfg-em1 裡記錄的 HWADDR (Mac address) 是 34:17:EB:9E:2A:E8，
但如果用 ip addr 去查的話，會發現實際的 Mac address 是 98:90:96:d5:53:ca：
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 98:90:96:d5:53:ca brd ff:ff:ff:ff:ff:ff inet 10.1.117.199/22 brd 10.1.119.255 scope global dynamic em1 valid_lft 860464sec preferred_lft 860464sec inet6 fe80::9a90:96ff:fed5:53ca/64 scope link valid_lft forever preferred_lft forever
為什麼 ifcfg-em1 記錄的是錯誤的… 這已經不可考了，
不過把它改成正確的 Mac address 之後，再重新 systemctl restart network，
就可以正確地啟動網路服務了～
以下是改好的 ifcfg-em1 的內容，HWADDR 的部分已經修正好了：
TYPE=Ethernet BOOTPROTO=dhcp DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=em1 UUID=0604c392-6189-49ad-abc0-8461a06321cf ONBOOT=yes #HWADDR=34:17:EB:9E:2A:E8 HWADDR=98:90:96:d5:53:ca PEERDNS=yes PEERROUTES=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes
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