AWS上SUSE Linux 11 SP4添加网卡遇到的坑

Posted 2020-12-31 betazhou

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目标：

给一台EC2增加一块新的网卡，并让所有Internet出口都从这块网卡走。

环境：

AWS 北京区，AMI：suse-sles-11-sp4-v20180104-hvm-ssd-x86_64 (ami-66dc010b)

问题：

1. 添加网络接口（Network Interface）之后，系统找不到新的网卡

具体添加一个网络接口的步骤可以参考：

http://docs.amazonaws.cn/en_us/AWSEC2/latest/UserGuide/using-eni.html#create_eni

添加完之后，由于SUSE无法使用AWS的ec2-net-utils，所以没有办法直接scan到新的网卡，必须要重启。

2. 新网卡名字变成 rename3

重启完之后，系统里面会把新网卡识别为 rename3

ip-172-31-188-206:~ # ifconfig -a
eth0      Link encap:Ethernet  HWaddr 02:28:1C:C2:71:92
          inet addr:172.31.188.206  Bcast:172.31.188.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:262 errors:0 dropped:0 overruns:0 frame:0
          TX packets:272 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:30586 (29.8 Kb)  TX bytes:29102 (28.4 Kb)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:100 (100.0 b)  TX bytes:100 (100.0 b)

rename3   Link encap:Ethernet  HWaddr 02:AA:54:AC:B2:E4
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 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:0 (0.0 b)  TX bytes:0 (0.0 b)

ip-172-31-188-206:~ #

　　可以通过编辑 /etc/udev/rules.d70-persistent-net.rules 来修改，具体修改成如下：

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="ixgbevf", ATTR{dev_id}=="0x0", KERNELS=="0000:00:03.0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="ixgbevf", ATTR{dev_id}=="0x0", KERNELS=="0000:00:04.0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

　　保持后重启。起来后就可以看到新的eth1

ip-172-31-188-206:~ # ifconfig -a
eth0      Link encap:Ethernet  HWaddr 02:28:1C:C2:71:92
          inet addr:172.31.188.206  Bcast:172.31.188.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:239 errors:0 dropped:0 overruns:0 frame:0
          TX packets:270 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:28436 (27.7 Kb)  TX bytes:29150 (28.4 Kb)

eth1      Link encap:Ethernet  HWaddr 02:AA:54:AC:B2:E4
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 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:0 (0.0 b)  TX bytes:0 (0.0 b)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:100 (100.0 b)  TX bytes:100 (100.0 b)

3. 给新网卡配置IP

　　因为EC2默认都是DHCP，所以这里就直接参照eth0的配置：

ip-172-31-188-206:~ # cd /etc/sysconfig/network
ip-172-31-188-206:/etc/sysconfig/network # cat ifcfg-eth0
BOOTPROTO=‘dhcp‘
MTU="9000"
REMOTE_IPADDR=‘‘
STARTMODE=‘hotplug‘
ip-172-31-188-206:/etc/sysconfig/network # cp ifcfg-eth0 ifcfg-eth1

　　然后重启网络服务：

ip-172-31-188-206:/etc/sysconfig/network # service network restart &
[1] 3666
ip-172-31-188-206:/etc/sysconfig/network # Shutting down network interfaces:
    eth0      device: Intel Corporation 82599 Ethernet Controller V                                                                        done
    eth1      device: Intel Corporation 82599 Ethernet Controller V                                                                        done
Shutting down service network  .  .  .  .  .  .  .  .  .                                                                                   done
Hint: you may set mandatory devices in /etc/sysconfig/network/config
Setting up network interfaces:
    eth0      device: Intel Corporation 82599 Ethernet Controller V
    eth0      Starting DHCP4 client.
    eth0      IP address: 172.31.188.206/24 (ip-172-31-188-206)                                                                            done
    eth1      device: Intel Corporation 82599 Ethernet Controller V
    eth1      Starting DHCP4 client.
    eth1      IP address: 172.31.189.38/24 (ip-172-31-189-38)                                                                              done
Setting up service network  .  .  .  .  .  .  .  .  .  .                                                                                   done

[1]+  Done                    service network restart

　　接下来就可以看到新的网卡得到了IP：

ip-172-31-188-206:/etc/sysconfig/network # ifconfig
eth0      Link encap:Ethernet  HWaddr 02:28:1C:C2:71:92
          inet addr:172.31.188.206  Bcast:172.31.188.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:645 errors:0 dropped:0 overruns:0 frame:0
          TX packets:517 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:62966 (61.4 Kb)  TX bytes:59731 (58.3 Kb)

eth1      Link encap:Ethernet  HWaddr 02:AA:54:AC:B2:E4
          inet addr:172.31.189.38  Bcast:172.31.189.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:783 (783.0 b)  TX bytes:963 (963.0 b)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:100 (100.0 b)  TX bytes:100 (100.0 b)

4. 最后一步就是完成新的路由

　　新的网卡默认是没有public IP，就算它是放在public subnet里面。所以这里可以分配一个EIP，然后assign到这个新的网络接口上。

　　我们先看当前的route表是:

ip-172-31-188-206:/etc/sysconfig/network # netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         172.31.188.1    0.0.0.0         UG        0 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
172.31.188.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
172.31.189.0    0.0.0.0         255.255.255.0   U         0 0          0 eth1

　　我们的目标是内部网络走eth0，外部走eth1，所以安装下面方式修改 /etc/sysconfig/network/routes

ip-172-31-188-206:/etc/sysconfig/network # cat routes
172.31.0.0/16   172.31.188.1    -       eth0
default         172.31.189.1    -       eth1

　　然后需要再次重启一下network服务：

ip-172-31-188-206:/etc/sysconfig/network # service network restart &
[1] 3666
ip-172-31-188-206:/etc/sysconfig/network # Shutting down network interfaces:
    eth0      device: Intel Corporation 82599 Ethernet Controller V                                                                        done
    eth1      device: Intel Corporation 82599 Ethernet Controller V                                                                        done
Shutting down service network  .  .  .  .  .  .  .  .  .                                                                                   done
Hint: you may set mandatory devices in /etc/sysconfig/network/config
Setting up network interfaces:
    eth0      device: Intel Corporation 82599 Ethernet Controller V
    eth0      Starting DHCP4 client.
    eth0      IP address: 172.31.188.206/24 (ip-172-31-188-206)                                                                            done
    eth1      device: Intel Corporation 82599 Ethernet Controller V
    eth1      Starting DHCP4 client.
    eth1      IP address: 172.31.189.38/24 (ip-172-31-189-38)                                                                              done
Setting up service network  .  .  .  .  .  .  .  .  .  .                                                                                   done

[1]+  Done                    service network restart

　　新的route表就变成如下：

ip-172-31-188-206:/etc/sysconfig/network # netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         172.31.189.1    0.0.0.0         UG        0 0          0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
172.31.0.0      172.31.188.1    255.255.0.0     UG        0 0          0 eth0
172.31.188.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0
172.31.189.0    0.0.0.0         255.255.255.0   U         0 0          0 eth1

备注：

　　以上操作步骤均通过本人测试，但并非官方解决方案，请勿直接在生产系统上操作。

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