在平常生活中，你們會遇到這種狀況，在家裏能夠自動獲取ip地址，上班的時候公司可能會禁網，因此會提供一個私網地址供你們使用，可是須要你們手鍊接網絡，比較麻煩。這就須要爲設備配置兩套方案，設置一個網絡接口來回切換，就會很方便了。vim
1、首先了解一下bonding的定義centos
bonding是經過將同一設備的多個物理網卡綁定到一個虛擬網卡上，再對外提供鏈接。對於外端來講，多個物理網卡共享虛擬網卡的IP和mac地址，也就表現爲一個網卡設備。經過bonding技術能夠實現高可用或者負載均衡。網絡
bonding的工做模式：負載均衡
Mode 0 輪轉策略：從頭至尾順序的在每個slave接口上面發送數據包。本模式提供負載均衡和容錯的能力
Mode 1 (active-backup)活動-備份（主備）策略：只有一個slave被激活，當且僅當活動的slave接口失敗時纔會激活其餘slave。 爲了不交換機發生混亂此時綁定的MAC地址只有一個外部端口上可見
Mode 3 (broadcast)廣播策略：在全部的slave接口上傳送全部的報文,提供容錯能力工具
2、Bonding的配置(centos6)oop
1.手工添加2塊網卡，並設置到同一個vmnet中（vmnet3）。用ifconfig查看兩個網卡是否加入進去性能
[root@centos6 network-scripts]#ifconfig eth2 Link encap:Ethernet HWaddr 00:0C:29:8F:26:2A UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:546 errors:0 dropped:0 overruns:0 frame:0 TX packets:13 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:164116 (160.2 KiB) TX bytes:938 (938.0 b) eth3 Link encap:Ethernet HWaddr 00:0C:29:8F:26:2A UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:552 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:164476 (160.6 KiB) TX bytes:0 (0.0 b) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:240 (240.0 b) TX bytes:240 (240.0 b)
2.建立bonding設備bond0的配置文件centos7
[root@centos6 ~]# cd /etc/sysconfig/network-scripts/ [root@centos6 network-scripts]# cp ifcfg-eth0 ifcfg-bond0 [root@centos6 network-scripts]# vim ifcfg-bond0 DEVICE=bond0 ONBOOT=yes BONDING_OPTS="miimon=100 mode=1" IPADDR=10.8.8.8 NETMASK=255.255.255.0 NM_CONTROLLED=no
miimon 是用來進行鏈路監測的。若是miimon=100，那麼系統每100ms 監測一次鏈路鏈接狀態，若是有一條線路不通就轉入另外一條線路spa
mode 是bonding的模式3d
3.配置slave的配置文件
[root@centos6 network-scripts]# cp ifcfg-eth0 ifcfg-eth2 [root@centos6 network-scripts]# vim ifcfg-eth2 DEVICE=eth2 TYPE=Ethernet ONBOOT=yes SLAVE=yes MASTER=bond0 NM_CONTROLLED=no [root@centos6 network-scripts]# cp ifcfg-eth0 ifcfg-eth3 [root@centos6 network-scripts]# vim ifcfg-eth3 DEVICE=eth3 TYPE=Ethernet ONBOOT=yes SLAVE=yes MASTER=bond0 NM_CONTROLLED=no
4.重啓網絡服務
[root@centos6 network-scripts]# service network restart
5.查看bonding的狀態
[root@centos6 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: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:8f:26:2a Slave queue ID: 0 Slave Interface: eth3 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 00:0c:29:8f:26:20 Slave
5. 更改bond0工做模式
直接修改bond0配置文件中的mode，重啓網絡服務便可
6.如何刪除bond0（先關再刪)
[root@centos6 network-scripts]#ifconfig bond0 down [root@centos6 network-scripts]#rm –f ifcfg-bond0
刪除eth2裏面的master,及slave
3、centos7的bonding配置（centos7中的補齊命令比centos6更強）
1.加2個網卡，在同一個vmnet中。
2.使用nmcli管理工具
1）建立邏輯網卡bond0
[root@centos7 network-scripts]#nmcli con add type bond con-name bond0 ifname bond0 mode active-backup Connection 'bond0' (c505387c-6f85-4af5-bf50-7958d8cf39ef) successfully added.
#add 至關與自動生成配置文件
[root@centos7 network-scripts]#nmcli con modify bond0 ipv4.addresses 20.20.20.20/24 ipv4.dns 8.8.8.8 ipv4.gateway 20.20.20.1 ipv4.method manual connection.autoconnect yes;--設定bond0 ip
2)添加從屬網路接口（增長slave的方案給兩塊新加的網卡）
[root@centos7 network-scripts]# nmcli connection add con-name slave-38 ifname ens38 type ethernet master bond0 Connection 'slave-38' (97708606-56ac-48aa-9014-c23a376c2379) successfully added. [root@centos7 network-scripts]# nmcli connection add con-name slave-39 ifname ens39 type ethernet master bond0 Connection 'slave-39' (608dc1a0-9407-45be-a720-4c415b4b8488) successfully added.
3.直接激活bond0
[root@centos7 network-scripts]# nmcli connection up bond0
4.更改bond0模式
[root@centos7network-scripts]# nmcli connection modify bond0 mode broadcast
5.刪除同centos6
4、建立網絡組Networking Teaming實現相似功能
網絡組：是將多個網卡聚合在一塊兒方法，從而實現冗錯和提升吞吐量。但網絡組不一樣於舊版中bonding技術，提供更好的性能和擴展性。
1.建立網絡組team0
[root@centos7 network-scripts]# nmcli connection add type team con-name team0 ifname team0 config '{"runner": {"name": "loadbalance"}}' Connection 'team0' (9a5ab96b-3cd3-412d-9532-1327c035367c) successfully added.
2.添加從屬網路接口
[root@centos7 network-scripts]# nmcli connection add con-name slave-38 ifname ens38 type team-slave master team0 Connection 'slave-38' (e5182e70-86a6-480f-bc14-2d2055bfab9f) successfully added. [root@centos7 network-scripts]# nmcli connection add con-name slave-39 ifname ens39 type team-slave master team0 Connection 'slave-39' (e31b4880-0095-4322-af49-63094bbe873d) successfully added.
3.設置team0的ip
[root@centos7 network-scripts]# nmcli connection modify team0 ipv4.method manual ipv4.addresses 20.20.20.20/24 connection.autoconnect yes
4.激活team0及slave
[root@centos7 network-scripts]# nmcli connection up team0 Connection successfully activated (master waiting for slaves) (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/13) [root@centos7 network-scripts]# nmcli connection up slave-38 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/16) [root@centos7 network-scripts]# nmcli connection up slave-39 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/18)
5.刪除team0
[root@centos7 network-scripts]# nmcli connection down team0 Connection 'team0' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/13) [root@centos7 network-scripts]# nmcli connection down slave-38 Connection 'slave-38' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/16) [root@centos7 network-scripts]# nmcli connection down slave-39 Connection 'slave-39' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/19) [root@centos7 network-scripts]# rm -f ifcfg-slave-3* [root@centos7 network-scripts]# rm -f ifcfg-team0
實驗：使用nmcli爲網卡配置2套方案，一個Dhcp一個靜態獲取
1.改舊方案的名稱（非必須）
[root@centos7 network-scripts]# nmcli connection modify ens34 connection.id home
2.將home的方案設置的自動獲取ipv4地址
[root@centos7network-scripts]#nmcli connection modify home ipv4.method auto
3.使方案生效
[root@centos7 network-scripts]#nmcli connection up home Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/9)
查看方案
[root@centos7 network-scripts]# nmcli connection show NAME UUID TYPE DEVICE ens33 dadb8960-c959-47f5-addb-13f8e439d72d ethernet ens33 home 482d5ab5-ac7d-4467-ac09-65440b174331 ethernet ens34 virbr0 1eee137a-f1ea-4fe8-b387-5d0561d76aca bridge virbr0
4.新增方案名爲office
[root@centos7 network-scripts]# nmcli connection add con-name office type ethernet ifname ens34
5.爲新增的方案進行配置靜態地址
[root@centos7 network-scripts]# nmcli connection modify office ipv4.method manual connection.autoconnect yes ipv4.addresses 8.8.8.8/24 ipv4.gateway 8.8.8.1 ipv4.dns 4.4.4.4
6.切換到新方案，使之生效
[root@centos7 network-scripts]# nmcli connection up office
查看方案
[root@centos7 network-scripts]# nmcli connection show NAME UUID TYPE DEVICE ens33 dadb8960-c959-47f5-addb-13f8e439d72d ethernet ens33 office 482d5ab5-ac7d-4467-ac09-65440b174331 ethernet ens34 virbr0 1eee137a-f1ea-4fe8-b387-5d0561d76aca bridge virbr0 home2ae365b6-ab9a-4882-8831-e38a362881e2 ethernet --
若是手工修改了配置文件，以下
[root@centos7 network-scripts]# vim /etc/sysconfig/network-scripts/ifcfg-office IPADDR=8.8.8.8 PREFIX=24 GATEWAY=8.8.8.1 DNS1=4.4.4.4
則須要使用nmcli connection reload來重讀後纔可以nmcli connection up
刪除方案
[root@centos7 network-scripts]# nmcli connection delete office