Linux环境，如何做bond，命令？bond的意义？有啥好处？两个网口，三个。。。n个，分别怎么做

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1、主要是不太明白为什么要做bond（还是bonding），本人刚入学。请支援！
2、请帮忙给出完整的linux操作命令，不胜感激。

你好，所谓bond，就是把多个物理网卡绑定成一个逻辑上的网卡
好处：增加带宽，还可以实现主备功能
至于命令，直接在/etc/sysconfig/network中编辑文件
vi /etc/sysconfig/network/ifcfg-bond0
BOOTPROTO="static"
BROADCAST="192.168.1.255"
IPADDR="192.168.1.251"
NETMASK="255.255.255.0"
NETWORK="192.168.1.0"
REMOTE_IPADDR=""
STARTMODE="onboot"
BONDING_MASTER="yes"
BONDING_MODULE_OPTS="mode=1 miimon=200 use_carrier=1 primary=eth?"
BONDING_SLAVE0="eth0"
BONDING_SLAVE1="eth1"
最后2个为绑定的网卡的名称，此例是把eth0和eth1共同绑定成bond0
最后要注意的是，绑定做好后，把eth0,eth1的配置文件删掉（保险点改个名字丢那好了）
重启网卡后绑定成功，如果还有不明白的可以再提问追问

1、主备功能具体是什么意思？意义是？
2、命令， Vi编辑器中编辑的文件/etc/sysconfig/network/ifcfg-bond0 进去发现不存在此文件，请给出具体的配置文件的名字以及该文件的具体路径。
3、配置完毕之后，把eth0,eth1的配置文件删掉（保险点改个名字丢那好了）？具体的他们的配置文件在哪里，目录？或者改名字该如何修改啊？
4、绑定成功后，重启网卡是不是重启主机？命令是reboot吗？

追答

1.下面有位哥们对主备解释过了，主备网卡不会因为其中一块坏了而导致机器不可用，避免单点故障。也就是冗余。
2. Vi编辑器中编辑的文件/etc/sysconfig/network/ifcfg-bond0 进去发现不存在此文件，本来就是不存在的，自己建立编辑的。
3.配置完毕之后，把eth0,eth1的配置文件删掉（保险点改个名字丢那好了）？具体的他们的配置文件在哪里，目录？或者改名字该如何修改啊？
eth0,eth1的配置文件也在/etc/sysconfig/network下
改名字用mv命令例如mv ifcfg-eth0 ifcfg-eth0.bak，这样这个配置文件就不生效了
4.绑定网卡后重启网卡就行了，不要重启主机
service network restart即可

 参考技术A BOND就是两块网卡可以使用同一个IP工作，不会因为其中一块坏了而导致机器不可用，避免单点故障，具体就是配置文件配好就可以了 参考技术B 做好了绑定，重启网卡 发现做bond0的两块网卡没有起来

Linux系统之Bonding 网卡绑定配置方法

Linux系统之Bonding 网卡绑定配置方法

一、检查本地系统环境

1.检查系统版本

[root@Server001 ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

2.查看服务器网卡

[root@Server001 network-scripts]# ifconfig  -a
bond0: flags=5123<UP,BROADCAST,MASTER,MULTICAST>  mtu 1500
        inet 192.168.30.122  netmask 255.255.255.0  broadcast 192.168.30.255
        ether a6:ad:e5:84:f0:6e  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

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.3.55  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 fe80::2a6e:d4ff:fe89:8720  prefixlen 64  scopeid 0x20<link>
        ether 28:6e:d4:89:87:20  txqueuelen 1000  (Ethernet)
        RX packets 2256  bytes 439140 (428.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 428  bytes 68770 (67.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::2a6e:d4ff:fe8a:3299  prefixlen 64  scopeid 0x20<link>
        ether 28:6e:d4:8a:32:99  txqueuelen 1000  (Ethernet)
        RX packets 1617  bytes 386452 (377.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7  bytes 586 (586.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::2a6e:d4ff:fe88:f490  prefixlen 64  scopeid 0x20<link>
        ether 28:6e:d4:88:f4:90  txqueuelen 1000  (Ethernet)
        RX packets 1617  bytes 386452 (377.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7  bytes 586 (586.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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

二、创建网卡配置文件

1.进入网卡配置文件目录

[root@Server001 ~]# cd /etc/sysconfig/network-scripts/
[root@Server001 network-scripts]# ls
ifcfg-bond0  ifdown-eth   ifdown-ppp       ifdown-tunnel  ifup-ippp   ifup-post    ifup-TeamPort      network-functions-ipv6
ifcfg-eth0   ifdown-ippp  ifdown-routes    ifup           ifup-ipv6   ifup-ppp     ifup-tunnel
ifcfg-lo     ifdown-ipv6  ifdown-sit       ifup-aliases   ifup-isdn   ifup-routes  ifup-wireless
ifdown       ifdown-isdn  ifdown-Team      ifup-bnep      ifup-plip   ifup-sit     init.ipv6-global
ifdown-bnep  ifdown-post  ifdown-TeamPort  ifup-eth       ifup-plusb  ifup-Team    network-functions

2.拷贝eth0的网卡配置文件

[root@Server001 network-scripts]# cp ifcfg-eth0 ifcfg-eth1
[root@Server001 network-scripts]# cp ifcfg-eth0 ifcfg-eth2
[root@Server001 network-scripts]# cp ifcfg-eth0 ifcfg-bond0

3.修改bond0网卡配置文件

[root@Server001 network-scripts]# cat ifcfg-bond0 
DEVICE=bond0
BOOTPROTO=none
TYPE=bond0
ONBOOT=yes
IPADDR=192.168.30.122
NETMASK=255.255.255.0

4.修改eth1网卡配置文件

[root@Server001 network-scripts]# cat ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
TYPE=Ethernet
MASTER=bond0
SLAVE=yes

5.修改eth2网卡配置文件

[root@Server001 network-scripts]# cat ifcfg-eth2
DEVICE=eth2
BOOTPROTO=none
TYPE=Ethernet
MASTER=bond0
SLAVE=yes

三、创建bonding的配置文件

1.编辑bonding.conf

[root@node network-scripts]# vim /etc/modprobe.d/bonding.conf
[root@node network-scripts]# cat /etc/modprobe.d/bonding.conf
alias bond0 bonding
options bonding mode=1 miimon=100

注：关于mode的说明
mode=0 //平衡循环
mode=1 //主备
mode=3 //广播
mode=4 //链路聚合

2.停止 NetworkManager 服务

systemctl stop NetworkManager
systemctl disable NetworkManage

3.加载 bonding 模块

[root@Server001 network-scripts]# lsmod |grep bonding
[root@Server001 network-scripts]#  modprobe bonding
[root@Server001 network-scripts]#  lsmod |grep bonding
bonding               152656  0

4.重启网络服务

systemctl restart network

四、查看网卡绑定情况

1.再次检查本地网卡

[root@Server001 network-scripts]# ifconfig 
bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST>  mtu 1500
        inet 192.168.30.122  netmask 255.255.255.0  broadcast 192.168.30.255
        inet6 fe80::2a6e:d4ff:fe8a:3299  prefixlen 64  scopeid 0x20<link>
        ether 28:6e:d4:8a:32:99  txqueuelen 1000  (Ethernet)
        RX packets 2426  bytes 748394 (730.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13  bytes 838 (838.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.3.55  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 fe80::2a6e:d4ff:fe89:8720  prefixlen 64  scopeid 0x20<link>
        ether 28:6e:d4:89:87:20  txqueuelen 1000  (Ethernet)
        RX packets 2853  bytes 740694 (723.3 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 478  bytes 75189 (73.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 28:6e:d4:8a:32:99  txqueuelen 1000  (Ethernet)
        RX packets 2229  bytes 689858 (673.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13  bytes 838 (838.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth2: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 28:6e:d4:8a:32:99  txqueuelen 1000  (Ethernet)
        RX packets 2243  bytes 690766 (674.5 KiB)
        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

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

2.查看网卡绑定状态

[root@Server001 network-scripts]# 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: eth1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth1
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 28:6e:d4:8a:32:99
Slave queue ID: 0

Slave Interface: eth2
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 28:6e:d4:88:f4:90
Slave queue ID: 0

五、测试网卡连通情况

1.本地客户端ping服务器

ping 192.168.30.122

六、关闭eth1网卡测试连通情况

1.关闭eth1网卡

[root@Server001 network-scripts]# ifdown eth1
[root@Server001 network-scripts]#

2.查看本地客户端连通情况

可以正常ping通

3.查看当前的bond0状态

当前活动网卡已经切换到eth2，eth2网卡提供服务

[root@Server001 network-scripts]# 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: eth2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth2
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 28:6e:d4:88:f4:90
Slave queue ID: 0

七、关闭eth2网卡测试连通情况

1.开启eth1网卡，关闭eth2网卡

[root@Server001 network-scripts]# ifup eth1
[root@Server001 network-scripts]# ifdown eth2

2.测试本地客户端连通情况

可以正常ping通

3.查看当前的bond0状态

当前活动网卡已经切换到eth1，eth1网卡提供服务

[root@Server001 network-scripts]# 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: eth1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth1
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: 28:6e:d4:8a:32:99
Slave queue ID: 0

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