centos7配置好网络后，重启网络不可用问题（Failed to start LSB: Bring up/down networking.）

vm安装并且配置好centos7系统后，重启之后，发现网络服务不可用。报如下错误：

Failed to start LSB: Bring up/down networking

[root@localhost network-scripts]# service network restart
Restarting network (via systemctl):  Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.[失败]
[root@localhost network-scripts]# systemctl status network.service
● network.service - LSB: Bring up/down networkingLoaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)Active: failed (Result: exit-code) since 一 2022-10-10 19:57:21 CST; 33s agoDocs: man:systemd-sysv-generator(8)Process: 8604 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost network[8604]: RTNETLINK answers: File exists
10月 10 19:57:21 localhost systemd[1]: network.service: control process exited, c...=1
10月 10 19:57:21 localhost systemd[1]: Failed to start LSB: Bring up/down networking.
10月 10 19:57:21 localhost systemd[1]: Unit network.service entered failed state.
10月 10 19:57:21 localhost systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

通过百度查找方法，解决方案共2步：

一、. 关闭NetworkManager

查看NetworkManager服务状态：systemctl status NetworkManager

[root@localhost network-scripts]# systemctl status NetworkManager
● NetworkManager.service - Network ManagerLoaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)Active: active (running) since 一 2022-10-10 19:49:06 CST; 9min agoDocs: man:NetworkManager(8)Main PID: 873 (NetworkManager)Tasks: 3CGroup: /system.slice/NetworkManager.service└─873 /usr/sbin/NetworkManager --no-daemon10月 10 19:49:06 localhost NetworkManager[873]: <info>  [1665402546.7071] manager:...e
10月 10 19:49:07 localhost NetworkManager[873]: <info>  [1665402547.0634] agent-ma...d
10月 10 19:49:07 localhost NetworkManager[873]: <info>  [1665402547.0657] audit: o..."
10月 10 19:49:07 localhost NetworkManager[873]: <info>  [1665402547.9415] manager:...)
10月 10 19:49:07 localhost NetworkManager[873]: <info>  [1665402547.9756] manager:...)
10月 10 19:51:21 localhost NetworkManager[873]: <info>  [1665402681.0323] agent-ma...d
10月 10 19:56:09 localhost NetworkManager[873]: <info>  [1665402969.6421] agent-ma...d
10月 10 19:56:09 localhost NetworkManager[873]: <info>  [1665402969.6443] audit: o..."
10月 10 19:57:21 localhost NetworkManager[873]: <info>  [1665403041.3942] agent-ma...d
10月 10 19:57:21 localhost NetworkManager[873]: <info>  [1665403041.3956] audit: o..."
Hint: Some lines were ellipsized, use -l to show in full.

关闭NetworkManager： systemctl stop NetworkManager

并设置开启默认不启动该服务： systemctl disable NetworkManager

二、配置MAC硬件地址

查询主机的硬件地址：ip add show

[root@localhost network-scripts]# ip add show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lovalid_lft forever preferred_lft foreverinet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000link/ether 00:0c:29:4c:d5:8c brd ff:ff:ff:ff:ff:ff
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000link/ether 52:54:00:52:0a:3d brd ff:ff:ff:ff:ff:ffinet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000link/ether 52:54:00:52:0a:3d brd ff:ff:ff:ff:ff:ff

因为我配置的ens33，所以在ens33中找，其中link/ether 00:0c:29:4c:d5:8c brd ff:ff:ff:ff:ff:ff中的00:0c:29:4c:d5:8c为电脑的硬件MAC地址，复制该地址。

修改 vi /etc/sysconfig/network-scripts/ifcfg-ens33 文件，在其中添加：

HWADDR=00:0c:29:4c:d5:8c

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
HWADDR=00:0c:29:4c:d5:8c
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy

重启启动网络：

systemctl restart network

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centos7配置好网络后，重启网络不可用问题（Failed to start LSB: Bring up/down networking.）

一、. 关闭NetworkManager

二、配置MAC硬件地址

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