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JohnnyNiu/find ip of machine.md

Last active June 28, 2016 06:32
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Problem that can't find IP of the machine by command in Groupmanagment/MailRouting run script
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find ip of machine.md

The script in the run script is using below command to calculate the ip of the localhost:

export HOST_IP=$(ifconfig $(ifconfig | grep ^eth | cut -d' ' -f1 | tail -1) | grep 'inet addr' | cut -d':' -f2 | cut -d' ' -f1)

or

export HOST_IP=$(ifconfig $(ifconfig | grep ^eth | cut -d' ' -f1) | grep 'inet addr' | cut -d':' -f2 | cut -d' ' -f1)

Sometimes, it is working on my machine, sometimes not. when it's not working, it reports error as below:

eth1: Unknown host

or no output.

It turns out there are more than one ethernet interface on my ubuntu: "eth0" and "eth1".

It turns out the second one is only appears after I plugin my iphone, in which "personal hotspot" is turned on.

The solution is either plug out my iphone or run command to remove the ethernet interface:

ifconfig eth1 down

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