<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[netplan导致systemd-networkd-wait-online.service卡住的问题]]></title><description><![CDATA[<p dir="auto">如果用netplan控制网络设备，同时把设备设置成固定ip。如果对应的设备不存在，那么在系统启动后<code>systemd-networkd-wait-online.service</code>就会卡住几分钟，导致后续的服务无法执行。</p>
<p dir="auto">比如下面的网络设置</p>
<pre><code>network:
  version: 2
  ethernets:
    enx00e04c680c9b:
      dhcp4: false
      addresses:
        - 192.168.198.1/24
      routes:
        - to: default
          via: 192.168.198.1
          metric: 200
    enx344b50000000:
      dhcp4: true
      dhcp4-overrides:
        route-metric: 90
</code></pre>
<p dir="auto">这样即使<code>enx00e04c680c9b</code>这个网络设备不存在或者<code>enx00e04c680c9b</code>网口上没有插网线<code>systemd-networkd-wait-online.service</code>这个服务也还是会卡住。这是因为netplan默认的后台用的是systemd-network。按照这样设置之后系统图形界面中也是看不到被控制的网卡的。同时由于网络同时受两个后端控制，还可能导致dns错误等问题。</p>
<p dir="auto">我们可以让netplan也使用NetworkManager作为后端来解决这个问题。只需要在配置中增加 <code>renderer: NetworkManager</code></p>
<p dir="auto">最后配置如下</p>
<pre><code>network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enx00e04c680c9b:
      dhcp4: false
      addresses:
        - 192.168.198.1/24
      routes:
        - to: default
          via: 192.168.198.1
          metric: 200
    enx344b50000000:
      dhcp4: true
      dhcp4-overrides:
        route-metric: 90
</code></pre>
<p dir="auto">这样就不会存在卡住的问题。同时网卡也可以在系统网络设置界面中看到。</p>
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