blocks|key|987282|text|这不可能。即使实例停机，主网卡也会在实例的整个生命周期内锁定到实例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|987283|987284|私有网络中的每个实例都有一个默认网络接口，称为主网络接口(eth0)。您不能将主网络接口与实例分离。|blockquote|987285|987286|https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html|offset|length|987287|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|1U|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|T|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|V|8|@]|9|@$I|W|J|X|1|Y]]|A|$]]|$1|K|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|H]]]]

This isn't possible. The Primary ENI is locked to the instance for the lifetime of the instance, even if the instance is stopped.

<blockquote>
 Every instance in a VPC has a default network interface, called the primary network interface (eth0). You cannot detach a primary network interface from an instance.
 
 <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html" rel="noreferrer">https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html</a>
</blockquote>

blocks|key|917388|text|您可以替换掉几乎所有其他内容(例如块卷、用户数据和属性)，而不是移动主网卡。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|917389|就像在我的例子中，我想用Dockerized版本替换我的旧实例，但又想重用它的旧IP地址。|917390|我设法通过停止旧实例和新实例来做到这一点。已断开两个实例上的数据块卷连接。已将新数据块卷连接到旧实例。更新旧实例的用户数据以匹配新实例的用户数据。已更新旧实例类型以匹配新实例类型。我还必须通过在另一台主机上执行以下命令来启用ENA支持：|917391|aws+ec2+modify-instance-attribute+--instance-id+<instance+id>+--ena-support|code-block|syntax|javascript|917392|然后我又重新启动了旧的实例。|917393|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Instead of moving a primary ENI, you can swap out almost everything else (eg block volumes, user data &amp; attributes).

Like in my case I wanted to replace my old instance with a Dockerized version of it, but wanted to reuse its old IP address.

I managed to do this by stopping both the old &amp; new instance.
Deattached the block volumes on both instances.
Attached the new block volume onto the old instance.
Updated the old instance's user data to match that of the new one.
Updated the old instance type to match that of the new one.
And I also had to enable ENA support by executing the following on a different host:

<pre><code>aws ec2 modify-instance-attribute --instance-id &lt;instance id&gt; --ena-support
</code></pre>

And then I started the old instance again.

blocks|key|982899|text|不确定这是否准确地回答了您的问题。我想在这两个术语之间做一个区分。主要/次要和首选。可以将辅助接口设置为首选接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|982900|假设有两个EC2实例A和B，每个实例都有一个主网卡-+ENI_A和ENI_B，它们是A和B各自的操作系统用来路由流量的首选网卡。现在需要创建另一个弹性网卡，比方说ENI_C+(eth1)，可以用于迁移。此ENI_C可以从实例A解除连接，然后连接到另一个实例B，反之亦然(正如您正确地做的那样)。|982901|无论何时将ENI_C连接到任何实例，都必须使其成为路由流量的首选网络接口。|982902|这可以通过创建新的路由表来实现。将那里的路由添加到默认网关，并指定使用新路由表的条件。|982903|示例：|982904|echo+"1+++test"+>>+/etc/iproute2/rt_tables

ip+rule+add+from+10.1.0.0/24+table+test++++++++++++++++#+When+to+use+test+routing+table

ip+route+add+default+via+10.1.0.1+dev+eth1+table+test++#+The+default+gateway|code-block|syntax|javascript|982905|您还可以通过将度量值设置为小于100的值，通过ENI_C添加高优先级默认路由来达到预期效果|982906|route+add+-net+default+gw+10.1.0.1+netmask+0.0.0.0+dev+eth1+metric+50++|982907|相应地更改上面的IP。|982908|为了测试ENI_C+(eth1)是否是发送流量的首选NIC，让我们看看哪个NIC用于发送流量，例如发送到Google+DNS+(8.8.8.8)|982909|ip+route+get+8.8.8.8|982910|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|L|7|1A|8|@]|9|@]|A|$M|N]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

Not sure if this exactly answers your question. I would like to make a distinction here between two terms. Primary/Secondary and Preferred. A secondary interface can be made the preferred one.

Let's say there are two EC2 instances A and B. Each having a primary ENI - ENI_A and ENI_B which are the preferred ENIs used by the respective operating system of A and B to route traffic. Now one needs to create another ENI, lets say ENI_C 
 (eth1), which can be used for migration. This ENI_C can be de-attached from instance A and attached to another instance B or vice versa (as you rightly do).

ENI_C has to be made the preferred network interface to route traffic whenever it is attached to any instance.

This can be achieved by creating a new routing table. Adding a route there to the default gateway and specify a condition when to use the new routing table.

Example:

<pre><code>echo "1 test" &gt;&gt; /etc/iproute2/rt_tables

ip rule add from 10.1.0.0/24 table test # When to use test routing table

ip route add default via 10.1.0.1 dev eth1 table test # The default gateway
</code></pre>

You can also achieve the desired effect by adding a high priority default route through ENI_C by setting metric value to lower value than 100

<pre><code>route add -net default gw 10.1.0.1 netmask 0.0.0.0 dev eth1 metric 50 
</code></pre>

Change the IPs above accordingly.

To test if the ENI_C (eth1) is your preferred NIC for sending traffic lets see which NIC is used to send traffic for example to Google DNS (8.8.8.8)

<pre><code>ip route get 8.8.8.8
</code></pre>

Can we change Primary Elastic Network Interface from Ec2 Instance to another Ec2? 

I'm able to swap the secondary ENI's between the Ec2 Instances, but not able to change the primary ENI from one Ec2 instance to the other.

Is it possible to change the primary ENI?

Change Primary Elastic Network Interface(ENI) between two EC2 Instances

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否可以将主弹性网络接口从Ec2实例更改为其他Ec2实例？我可以在两个Ec2实例之间调换辅助网卡，但无法将主网卡从一个Ec2实例切换到另一个实例。是否可以更换主网卡？

问更换两个EC2实例之间的弹性网卡
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