多网卡绑定

生产环境中将多块网卡绑定同一IP地址对外提供服务，可以实现高可用或者负载均衡。直接给两块网卡设置同一IP地址是不可以的。通过bonding，虚拟一块网卡对外提供连接，物理网卡被修改为相同的MAC地址 。

实验环境：

centos7主机一台、网卡设备2块。

此次实验通过两种方式来实现bonding，第一种为修改配置文件，第二种为命令行。

修改配置文件实现bonding

一、创建band0配置文件

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[root@centos7 ~]# vim /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=192.168.172.100
PREFIX=24
BONDING_OPTS='miimon=100 mode=1'

二、配置第一块网卡

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[root@centos7 ~]#vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
DEVICE=ens33
ONBOOT=yes
MASTER=bond0
SLAVE=yes

三、配置第二块网卡

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[root@centos7 ~]# vim /etc/sysconfig/network-scripts/ifcfg-ens37
TYPE=Ethernet
DEVICE=ens37
ONBOOT=yes
MASTER=bond0
SLAVE=yes

四、重启网络服务

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[root@centos7 ~]# systemctl restart network

五、查看bond状态

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[root@centos7 ~]# cat /proc/net/bonding/bond0 
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: ens33
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: ens33
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:63:21:a6
Slave queue ID: 0

Slave Interface: ens37
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:63:21:b0
Slave queue ID: 0

命令行实现bonding

一、创建bond0

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[root@centos7 ~]# nmcli connection add con-name bond0 ifname bond0 type bond mode active-backup ipv4.method manual ipv4.addresses 192.168.172.100
Connection 'bond0' (6a323a49-1f74-4424-aa90-8dde22bba989) successfully added.

二、将ens33及ens37加入bond0

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[root@centos7 ~]# nmcli connection add type bond-slave ifname ens33 master bond0 
Connection 'bond-slave-ens33' (ecacd740-fe79-43a8-9c99-190d17663d01) successfully added.
[root@centos7 ~]# nmcli connection add type bond-slave ifname ens37 master bond0 
Connection 'bond-slave-ens37' (ea66c3cf-66b5-4438-ad97-058d70c25c28) successfully added.

三、将ens33及ens37关联至bond0

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[root@centos7 ~]# nmcli connection up bond-slave-ens33
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/6)
[root@centos7 ~]# nmcli connection up bond-slave-ens37
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/7)

四、启用bond0

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[root@centos7 ~]# nmcli connection up bond0

五、查看bonding状态

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[root@centos7 ~]# cat /proc/net/bonding/bond0 
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: ens33
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: ens33
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:63:21:a6
Slave queue ID: 0

Slave Interface: ens37
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:63:21:b0
Slave queue ID: 0

删除bonding

1.禁用bond0

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[root@centos7 ~]# nmcli connection down bond0
Connection 'bond0' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)

2.删除bond相关链接

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[root@centos7 ~]# nmcli connection delete bond0
Connection 'bond0' (6a323a49-1f74-4424-aa90-8dde22bba989) successfully deleted.
[root@centos7 ~]# nmcli connection delete bond-slave-ens33
Connection 'bond-slave-ens33' (ecacd740-fe79-43a8-9c99-190d17663d01) successfully deleted.
[root@centos7 ~]# nmcli connection delete bond-slave-ens37
Connection 'bond-slave-ens37' (ea66c3cf-66b5-4438-ad97-058d70c25c28) successfully deleted.