service network restart 无法启动，ifconfig内容异常

问题日志：

[[email protected] 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.
                                                           [FAILED]
[[email protected] network-scripts]# systemctl status network.service
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sat 2020-05-23 14:27:44 CST; 5s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 3332 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 network[3332]: RTNETLINK answers: File exists
May 23 14:27:44 hadoop-01 systemd[1]: network.service: control process exit...=1
May 23 14:27:44 hadoop-01 systemd[1]: Failed to start LSB: Bring up/down ne...g.
May 23 14:27:44 hadoop-01 systemd[1]: Unit network.service entered failed state.
May 23 14:27:44 hadoop-01 systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

现象（NET模式，现在与主机无法ping通）：

[[email protected] ~]# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:b7:62:bc  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[[email protected] ~]# 

场景：虚拟机环境+2台克隆虚拟机，设置静态ip之后，出现这个问题

解决方案：

编辑：/etc/sysconfig/network-scripts/ifcfg-ens33

TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"
IPADDR="192.168.1.12"
NETMASK="255.255.255.0"
NETWORK="192.168.1.1"
GATEWAY="192.168.1.2"
DNS1=8.8.8.8
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="ens33"
UUID="c5dabc99-22de-41ec-ab3b-da21025a1b69"
DEVICE="ens33"
ONBOOT="yes"