运维调试记录：Mininet: Cannot find required executable controller

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问题

当我运行mininet时，出现以下问题：

***Creating network

***Adding controller

***Adding hosts:

h1 h2 h3 h4 h5

***Adding switches:

s1

***Adding links:

(h1, s1) (h2, s1) (h3, s1) (h4, s1) (h5, s1)

***Configuring hosts

***Starting controller

Cannot find required executable controller.

Please make sure that it is installed and available in your $PATH:

(/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin)

解决

运行以下命令：

sudo ln /usr/bin/ovs-controller /usr/bin/controller

即可解决。