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# 附录：配置 Linux 以识别多个网络接口的以太网设备
<a name="hana-ops-appendix"></a>

按照以下步骤配置 Linux 操作系统，以识别和命名与为逻辑网络分隔而创建的新弹性网络接口相关联的以太网设备，[本白皮书前面](hana-ops-networking.md#hana-ops-config)已经讨论过。

1. 使用 SSH 以 `ec2-user` 身份连接到 SAP HANA 主机，使用 `sudo` 连接到 root。

1. 删除现有 `udev` 规则；例如：

   ```
   hanamaster:# rm -f /etc/udev/rules.d/70-persistent-net.rules
   ```

1. 创建新 `udev` 规则，基于 MAC 地址而不是其他设备属性编写规则。这将确保在重新启动时，`eth0` 仍然是 `eth0`，`eth1` 是 `eth1`，依此类推。例如：

   ```
   hanamaster:# cat <<EOF >/etc/udev/rules.d/75-persistent-net- generator.rules
   # Copyright (C) 2012 Amazon.com, Inc. or its affiliates. # All Rights Reserved.
   #
   # Licensed under the Apache License, Version 2.0 (the "License").
   # You may not use this file except in compliance with the License.
   # A copy of the License is located at #
   #	    https://aws.amazon.com/apache2.0/ #
   # or in the "license" file accompanying this file. This file is # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
   # OF ANY KIND, either express or implied. See the License for the
   # specific language governing permissions and limitations under the
   # License.
   # these rules generate rules for persistent network device naming
   SUBSYSTEM!="net", GOTO="persistent_net_generator_end" KERNEL!="eth*", GOTO="persistent_net_generator_end" ACTION!="add", GOTO="persistent_net_generator_end" NAME=="?*", GOTO="persistent_net_generator_end"
   
   # do not create rule for eth0
   ENV{INTERFACE}=="eth0", GOTO="persistent_net_generator_end" # read MAC address
   ENV{MATCHADDR}="\$attr{address}" # do not use empty address
   ENV{MATCHADDR}=="00:00:00:00:00:00",
   GOTO="persistent_net_generator_end"
   # discard any interface name not generated by our rules ENV{INTERFACE_NAME}=="?*", ENV{INTERFACE_NAME}=""
   # default comment
   ENV{COMMENT}="elastic network interface" # write rule IMPORT{program}="write_net_rules"
   # rename interface if needed ENV{INTERFACE_NEW}=="?*", NAME="\$env{INTERFACE_NEW}"
   LABEL="persistent_net_generator_end" EOF
   ```

1. 确保接口属性正确。例如：

   ```
   hanamaster:# cd /etc/sysconfig/network/
   
   hanamaster:# cat <<EOF >/etc/sysconfig/network/ifcfg-ethN
   BOOTPROTO='dhcp4'
   MTU="9000"
   REMOTE_IPADDR=''
   STARTMODE='onboot'
   LINK_REQUIRED=no
   LINK_READY_WAIT=5
   EOF
   ```

1. 确保最多可再容纳七个以太网设备或网络接口，然后重新启动 `wicked`。例如：

   ```
   hanamaster:# for dev in eth{1..7} ; do
   ln -s -f ifcfg-ethN /etc/sysconfig/network/ifcfg-${dev} done
   
   hanamaster:# systemctl restart wicked
   ```

1. 创建新的网络接口并将其附加到实例。

1. 重新启动。

1. 修改 `/etc/iproute2/rt_tables`。
**重要**  
对连接到实例的每个 ENI 重复以下操作。

   例如：

   ```
   hanamaster:# cd /etc/iproute2
   hanamaster:/etc/iproute2 # echo "2 eth1_rt" >> rt_tables
   hanamaster:/etc/iproute2 # ip route add default via 172.16.1.122 dev eth1 table eth1_rt
   
   hanamaster:/etc/iproute2 # ip rule
   0:	from all lookup local
   32766:	from all lookup main
   32767:	from all lookup default
   
   hanamaster:/etc/iproute2 # ip rule add from <ENI IP Address>
   lookup eth1_rt prio 1000
   
   hanamaster:/etc/iproute2 # ip rule 0:	from all lookup local
   1000:	from <ENI IP address> lookup eth1_rt
   32766:	from all lookup main
   32767:	from all lookup default
   ```