一：Centos使用前需了解的

1：網卡

centos6的網卡重啟方法：
service network restart

centos7的網卡重啟方法：
systemctl restart network

2：防火墻

開啟防火墻：systemctl start firewalld
關閉防火墻：systemctl stop firewalld
查看防火墻狀態：systemctl status firewalld.service

開機自動啟動：systemctl enable firewalld
關閉防火墻并設置開機不啟動：systemctl disable firewalld

查看開機是否啟動：chkconfig --list|grep network(RHLE6)

3、關閉安全增強性（在生產環境中一定要關閉）：
vim /etc/selinux/config或vim /etc/sysconfig/selinux

二：啟動網卡服務錯誤

systemctl start network 啟動網卡服務報錯

[root@localhost home]# systemctl restart network Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journal ctl -xe" for details.

• 提示錯誤：
  Job for network.service failed because the control process exited with error code. See “systemctl status network.service” and “journal
  ctl -xe” for details

解決思路：查看錯誤日志

[root@localhost home]# 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 Sun 2021-08-01 11:03:33 PDT; 13min agoDocs: man:systemd-sysv-generator(8)Process: 4841 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)CGroup: /system.slice/network.service└─999 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient-bbefb2ab-4633-33f7-b5b5-dffb4e3eb945-ens33.lease -pf /var/run/...Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain network[4841]: RTNETLINK answers: File exists Aug 01 11:03:33 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1 Aug 01 11:03:33 localhost.localdomain systemd[1]: Failed to start LSB: Bring up/down networking. Aug 01 11:03:33 localhost.localdomain systemd[1]: Unit network.service entered failed state. Aug 01 11:03:33 localhost.localdomain systemd[1]: network.service failed.

• 輸入以下命令即可解決

[root@localhost zzc]# systemctl stop NetworkManager [root@localhost zzc]# systemctl disable NetworkManager [root@localhost zzc]#

• 再重啟網卡服務，不會報錯

[root@localhost home]# systemctl restart network [root@localhost home]#

三：橋接模式下無法上網

總結

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