附录：配置 Linux 以识别多个网络接口的以太网设备 - AWS 上的 SAP HANA
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附录：配置 Linux 以识别多个网络接口的以太网设备

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。

  2. 删除现有 udev 规则；例如： 

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

  3. 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

  4. 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

  5. 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

  6. 创建新的网络接口并将其附加到实例。

  7. 重新启动。

  8. 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