centos没有root添加网卡驱动

如果没有root权限，Centos系统添加网卡驱动就变得比较复杂。建议你检查一下，是否是因为CentOS系统缺少了驱动程序，而没有正确识别网卡设备；如果是这样，需要你找到相关的驱动文件，将其复制到系统中，然后再安装驱动程序，最后重启系统即可。

一、准备环境

VMware软件、Centos7虚拟机

二、添加网卡

为虚拟机再添加两块网卡，查看网卡信息，可以看到有ens32、ens34、ens35三块网卡

ip addr

1: lo: <LOOPBACK,UP,LOWER_UP>mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

      valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

      valid_lft forever preferred_lft forever

2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:54:02:06 brd ff:ff:ff:ff:ff:ff

    inet 192.168.30.142/24 brd 192.168.30.255 scope global noprefixroute dynamic ens32

      valid_lft 1615sec preferred_lft 1615sec

    inet6 fe80::d089:c15:e69a:8ce4/64 scope link noprefixroute

      valid_lft forever preferred_lft forever

3: ens34: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:54:02:1a brd ff:ff:ff:ff:ff:ff

    inet 192.168.30.143/24 brd 192.168.30.255 scope global noprefixroute dynamic ens34

      valid_lft 1765sec preferred_lft 1765sec

    inet6 fe80::a4af:b843:9032:9dd3/64 scope link noprefixroute

      valid_lft forever preferred_lft forever

4: ens35: <BROADCAST,MULTICAST,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

    link/ether 00:0c:29:54:02:10 brd ff:ff:ff:ff:ff:ff

    inet 192.168.30.141/24 brd 192.168.30.255 scope global noprefixroute dynamic ens35

      valid_lft 1765sec preferred_lft 1765sec

    inet6 fe80::b7cf:76d7:23aa:63c2/64 scope link noprefixroute

      valid_lft forever preferred_lft forever

查看网卡配置文件，可以看到添加网卡后，并没有生成对应的网卡文件

ls /etc/sysconfig/network-scripts/ifcfg*

/etc/sysconfig/network-scripts/ifcfg-ens32  /etc/sysconfig/network-scripts/ifcfg-lo

可以为网卡生成配置文件，但在本文中不需要这样做

nmcli connection add type ethernet con-name ens34 ifname ens34 autoconnect yes

nmcli connection add type ethernet con-name ens35 ifname ens35 autoconnect yes

再次查看网卡配置文件，生成成功

ls /etc/sysconfig/network-scripts/ifcfg*

/etc/sysconfig/network-scripts/ifcfg-ens32  /etc/sysconfig/network-scripts/ifcfg-ens35

/etc/sysconfig/network-scripts/ifcfg-ens34  /etc/sysconfig/network-scripts/ifcfg-lo

三，选定网卡绑定模式

多网卡一共有7种bond模式，这里直接选用mode=6 (balance-alb) Adaptive load balancing（适配器适应性负载均衡），该模式不需要交换机支持

四、开始配置

1、加载bonding模块，并设置开机启动

[root@localhost ~]#lsmod|grepbonding[root@localhost ~]#modprobe bonding[root@localhost ~]#lsmod|grepbondingbonding              152979  0

启用rc.local开机启动项

chmod +x /etc/rc.d/rc.local

在文件中写入modprobe bonding

2、建立bond网口配置文件并进行配置

/etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0

NAME=bond0

TYPE=Bond

BONDING_MASTER=yes

IPADDR=192.168.30.250

PREFIX=255.255.255.0

GATEWAY=192.168.30.2

DNS1=114.114.114.114

ONBOOT=yes

BOOTPROTO=none

BONDING_OPTS="mode=6  miimon=100"

3、修改三块网卡的配置

vi /etc/sysconfig/network-scripts/ifcfg-ens32

DEVICE=ens32

ONBOOT=yes

BOOTPROTO=none

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

vi /etc/sysconfig/network-scripts/ifcfg-ens34

DEVICE=ens34

ONBOOT=yes

BOOTPROTO=none

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

vi /etc/sysconfig/network-scripts/ifcfg-ens35

DEVICE=ens35

ONBOOT=yes

BOOTPROTO=none

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

4、重新加载网络配置

注意：这一步会断网！

nmcli connection reload &&systemctl restart network.service

使用新IP链接ssh

五、验证绑定是否生效

cat /proc/net/bonding/bond0

Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: adaptive load balancing

Primary Slave: None

Currently Active Slave: ens32

MII Status: up

MII Polling Interval (ms): 100

Up Delay (ms): 0

Down Delay (ms): 0

Slave Interface: ens32

MII Status: up

Speed: 1000 Mbps

Duplex: full

Link Failure Count: 0

Permanent HW addr: 00:0c:29:54:02:06

Slave queue ID: 0

Slave Interface: ens34

MII Status: up

Speed: 1000 Mbps

Duplex: full

Link Failure Count: 0

Permanent HW addr: 00:0c:29:54:02:1a

Slave queue ID: 0

Slave Interface: ens35

MII Status: up

Speed: 1000 Mbps

Duplex: full

Link Failure Count: 0

Permanent HW addr: 00:0c:29:54:02:10

Slave queue ID: 0

查看网卡状态

ip addr

1: lo: <LOOPBACK,UP,LOWER_UP>mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

      valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host

      valid_lft forever preferred_lft forever

2: ens32: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast master bond0 state UP group default qlen 1000

    link/ether 00:0c:29:54:02:06 brd ff:ff:ff:ff:ff:ff

3: ens34: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast master bond0 state UP group default qlen 1000

    link/ether 00:0c:29:54:02:1a brd ff:ff:ff:ff:ff:ff

4: ens35: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP>mtu 1500 qdisc pfifo_fast master bond0 state UP group default qlen 1000

    link/ether 00:0c:29:54:02:10 brd ff:ff:ff:ff:ff:ff

5: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP>mtu 1500 qdisc noqueue state UP group default qlen 1000

    link/ether 00:0c:29:54:02:06 brd ff:ff:ff:ff:ff:ff

    inet 192.168.30.250/24 brd 192.168.30.255 scope global bond0

      valid_lft forever preferred_lft forever

    inet6 fe80::20c:29ff:fe54:206/64 scope link

      valid_lft forever preferred_lft forever

查看接口带宽，带宽为3G

ethtool bond0

Settings for bond0:

        Supported ports: [ ]

        Supported link modes:  Not reported

        Supported pause frame use: No

        Supports auto-negotiation: No

        Supported FEC modes: Not reported

        Advertised link modes:  Not reported

        Advertised pause frame use: No

        Advertised auto-negotiation: No

        Advertised FEC modes: Not reported

        Speed: 3000Mb/s

        Duplex: Full

        Port: Other

        PHYAD: 0

        Transceiver: internal

        Auto-negotiation: off

        Link detected: yes

连续ping测试，并禁用第一个网卡，此时会丢一个包，网络依然正常运行

来自 192.168.30.250 的回复: 字节=32 时间<1ms TTL=64

来自 192.168.30.250 的回复: 字节=32 时间<1ms TTL=64

来自 192.168.30.250 的回复: 字节=32 时间=1ms TTL=64

请求超时。

来自 192.168.30.250 的回复: 字节=32 时间=1ms TTL=64

来自 192.168.30.250 的回复: 字节=32 时间<1ms TTL=64

完毕！

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