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<div style="direction:ltr">Probably unrelated to slurm entirely, and most likely has to do with lower-level network diagnostics. I can guarantee that it’s possible to access Internet resources from a compute node. Notes and things to check:</div>
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<div style="direction:ltr">1. Both ping and http/https are IP protocols, but are very different (ping isn’t even TCP or UDP, it’s ICMP), so even if you needed proxy variables for http and https to work, they shouldn’t affect ping.</div>
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<div style="direction:ltr">2. Do http or https transfers work from a compute node? A github clone, a test with curl or wget to a nearby web server? Do your proxy variables exist on the compute node, and most importantly, is there a proxy server listening and
functional on the host and port that the variables point to?</div>
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<div style="direction:ltr">3. What’s the default gateway for your compute nodes? Does that gateway provide network address translation (NAT) for the nodes, or does it work as a traditional router?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> slurm-users <slurm-users-bounces@lists.schedmd.com> on behalf of Mahmood Naderan <mahmood.nt@gmail.com><br>
<b>Sent:</b> Sunday, August 2, 2020 7:52:52 AM<br>
<b>To:</b> Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Subject:</b> [slurm-users] Internet connection loss with srun to a node</font>
<div> <span style="font-family: tahoma, sans-serif; font-size: inherit; text-align: center;">Hi</span></div>
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<div class="x_gmail_default" style="font-family:tahoma,sans-serif">A frontend machine is connected to the internet and from that machine, I use srun to get a bash on another node. But it seems that the node is unable to access the internet. The http_proxy and
https_proxy are defined in ~/.bashrc</div>
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<div class="x_gmail_default" style="font-family:tahoma,sans-serif">mahmood@main-proxy:~$ ping
<a href="http://google.com">google.com</a><br>
PING <a href="http://google.com">google.com</a> (216.58.215.238) 56(84) bytes of data.<br>
64 bytes from <a href="http://zrh11s02-in-f14.1e100.net">zrh11s02-in-f14.1e100.net</a> (216.58.215.238): icmp_seq=1 ttl=114 time=1.38 ms<br>
^C<br>
--- <a href="http://google.com">google.com</a> ping statistics ---<br>
1 packets transmitted, 1 received, 0% packet loss, time 0ms<br>
rtt min/avg/max/mdev = 1.384/1.384/1.384/0.000 ms<br>
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<div class="x_gmail_default" style="font-family:tahoma,sans-serif">mahmood@main-proxy:~$ <span style="font-family:Arial,Helvetica,sans-serif">srun -p gpu_part --gres=gpu:titanv:1 --pty /bin/bash</span></div>
<span class="x_gmail_default" style="font-family:tahoma,sans-serif"></span>mahmood @fry0:~$ ping
<a href="http://google.com">google.com</a><br>
PING <a href="http://google.com">google.com</a> (216.58.215.238) 56(84) bytes of data.<br>
^C<br>
--- <a href="http://google.com">google.com</a> ping statistics ---<br>
3 packets transmitted, 0 received, 100% packet loss, time 2026ms<br>
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<div class="x_gmail_default" style="font-family:tahoma,sans-serif">I guess that is related to slurm and srun.</div>
<div class="x_gmail_default" style="font-family:tahoma,sans-serif">Any idea for that?</div>
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<div dir="ltr"><font face="tahoma,sans-serif">Regards,<br>
Mahmood</font><br>
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