一：Centos使用前需了解的

1：网卡

centos6的网卡重启方法：
service network restart

centos7的网卡重启方法：
systemctl restart network

2：防火墙

开启防火墙：systemctl start firewalld
关闭防火墙：systemctl stop firewalld
查看防火墙状态：systemctl status firewalld.service

开机自动启动：systemctl enable firewalld
关闭防火墙并设置开机不启动：systemctl disable firewalld

查看开机是否启动：chkconfig --list|grep network(RHLE6)

3、关闭安全增强性（在生产环境中一定要关闭）：
vim /etc/selinux/config或vim /etc/sysconfig/selinux

二：启动网卡服务错误

systemctl start network 启动网卡服务报错

[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.

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

解决思路：查看错误日志

[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.

输入以下命令即可解决

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

再重启网卡服务，不会报错

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

三：桥接模式下无法上网

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