一、概述

Hadoop集群中，有许多服务器部署着关键实例，如NameNode、ResourceManager、Zookeeper等，这些服务的稳定运行对集群健康具有重要意义。虽然这些服务基本上都会做多实例高可用部署，但是若连接的是同个交换机，万一交换机发生故障，则集群基本处于不可用状态。因此，对关键节点需要做交换机的高可用配置，即同一个服务器连接多台交换机以提高可用性。

二、操作步骤

1.启用双网卡配置

（1）关闭NetworkManager

[root@mycentos ~]# /etc/init.d/NetworkManager status
NetworkManager (pid  1520) 正在运行...
[root@mycentos ~]# /etc/init.d/NetworkManager stop
停止 NetworkManager 守护进程：                             [确定]
[root@mycentos ~]# /etc/init.d/NetworkManager status
NetworkManager 已停
[root@mycentos ~]# chkconfig NetworkManager off
[root@mycentos ~]# chkconfig --list | grep NetworkManager
NetworkManager     0:关闭    1:关闭    2:关闭    3:关闭    4:关闭    5:关闭    6:关闭
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（2）配置网卡信息

[root@mycentos ~]# cat /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
NM_CONTROLLED=no
USERCTL=no
IPADDR=192.168.110.130
NETMASK=255.255.255.0
GATEWAY=192.168.110.3
[root@mycentos ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
ONBOOT=yes
USERCTL=no
[root@mycentos ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
MASTER=bond0
SLAVE=yes
ONBOOT=yes
USERCTL=no
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（3）修改modprobe相关设定文件

[root@mycentos ~]# lsmod | grep bonding
[root@mycentos ~]# cat /etc/modprobe.d/bonding.conf
alias bond0 bonding
options bonding mode=1 miimon=200
[root@mycentos ~]# cat /etc/rc.local
#!/bin/sh
touch /var/lock/subsys/local
ifenslave bond0 eth0 eth1
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（4）加载模块并重启网络

如果是远程连接，必须以下两个命令一起执行。单独执行时，执行完 modprobe bonding后连接便会端口。

[root@mycentos ~]# modprobe bonding&&service network restart
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（5）重启网络，确认是否生效

[root@mycentos ~]# ifconfig
bond0     Link encap:Ethernet  HWaddr 00:0C:29:1C:A8:0B
          inet addr:192.168.110.130 Bcast:192.168.110.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe1c:a80b/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:775 errors:0 dropped:0 overruns:0 frame:0
          TX packets:97 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:47633 (46.5 KiB)  TX bytes:8828 (8.6 KiB)
eth0      Link encap:Ethernet  HWaddr 00:0C:29:1C:A8:0B
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:31951 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14381 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:26089260 (24.8 MiB)  TX bytes:1030962 (1006.7 KiB)
eth1      Link encap:Ethernet  HWaddr 00:0C:29:1C:A8:0B
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:44062 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1378 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2699466 (2.5 MiB)  TX bytes:218716 (213.5 KiB)
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:64 errors:0 dropped:0 overruns:0 frame:0
          TX packets:64 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:4128 (4.0 KiB)  TX bytes:4128 (4.0 KiB)
[root@mycentos ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:0c:29:1c:a8:0b brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP qlen 1000
    link/ether 00:0c:29:1c:a8:0b brd ff:ff:ff:ff:ff:ff
4: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 00:0c:29:1c:a8:0b brd ff:ff:ff:ff:ff:ff
    inet 192.168.110.130/24 brd 192.168.111.255 scope global bond0
    inet6 fe80::20c:29ff:fe1c:a80b/64 scope link
       valid_lft forever preferred_lft forever
[root@mycentos ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.110.0   0.0.0.0         255.255.255.0   U     0      0        0 bond0
169.254.0.0     0.0.0.0         255.255.0.0     U     1004   0        0 bond0
0.0.0.0         192.168.110.3   0.0.0.0         UG    0      0        0 bond0
[root@mycentos ~]# lsmod | grep bonding
bonding               131724  0
[root@mycentos ~]# 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: eth0
MII Status: up
MII Polling Interval (ms): 200
Up Delay (ms): 0
Down Delay (ms): 0
Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:1c:a8:0b
Slave queue ID: 0
Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:0c:29:1c:a8:15
Slave queue ID: 0
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2.停用双网卡配置

如需恢复原先的单网卡配置，步骤如下

#去掉rc.local关于bond的配置
[root@mycentos ~]# vim /etc/rc.local
#删除bond相关配置文件
[root@mycentos ~]# rm -rf /etc/modprobe.d/bonding.conf
[root@mycentos ~]# rm -rf /etc/sysconfig/network-scripts/ifcfg-bond0
# 恢复网卡原先配置
[root@mycentos ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
[root@mycentos ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
#删除bonding模块并重启网络
[root@mycentos ~]# rmmod bonding&&service network restart
---------------------
【转载】
作者：fish的饭票
原文：https://blog.csdn.net/lxbalex/article/details/83660409

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