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iputils use flag for arping #1572

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themicster opened this issue Sep 13, 2016 · 5 comments
Closed

iputils use flag for arping #1572

themicster opened this issue Sep 13, 2016 · 5 comments

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@themicster
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@themicster themicster commented Sep 13, 2016

I would like to see arping included in CoreOS as I used it to make sure my gateway knew of ip addresses that have moved to a new machine so my containers can float around my cluster. It used to be included because of a bug in iputils but since has been fixed and the USE flag needs to be set to get it included now.

@crawford
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@crawford crawford commented Sep 15, 2016

Do you know which version of CoreOS used to include this?

@johan-adriaans
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@johan-adriaans johan-adriaans commented Sep 16, 2016

I'm not sure if it helps, but 1010.6.0 used to have arping. I have the same problem.

@johan-adriaans
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@johan-adriaans johan-adriaans commented Sep 16, 2016

BTW, this is a reasonable workaround:

docker run --net=host --entrypoint /usr/sbin/arping --rm alpine:3.4 -c 10 -U -I eth0 123.123.123.123
@themicster
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@themicster themicster commented Sep 16, 2016

It was in 1010.6.0. That looks like a good work around. But it is a bit slower.

@coresolve
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@coresolve coresolve commented Mar 8, 2017

Another point on this.
When deploying to aws we have public and private subnets. If you are troubleshooting connectivity on a private subnet and have managed to blackhole your traffic. It's useful to have tracepath available without the need to start a toolbox. Since starting a toolbox expects that you have network connectivity.

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