Hi Mahmood, I had the same problem some time ago when I took control of the cluster and wanted to update the OS. While the login node has access to internet, the calculation nodes are connected to the login node and is a private network. Therefore, the only machine with access to the internet was the login node, unless you configure each calculation node to use as a proxy the login node. I believe I followed the instructions in this webpage to configure the calculation nodes (CentOS7)
https://forums.centos.org/viewtopic.php?f=16&t=8583&start=10 Good luck configuring your machines. Best regards El dom., 2 ago. 2020 a las 17:15, Brian Andrus (<toomuc...@gmail.com>) escribió: > This is very likely by design of the cluster and/or network. Otherwise > users could use the cluster to mine bitcoin and such. > > Brian Andrus > On 8/2/2020 7:11 AM, Mahmood Naderan wrote: > > I thought that maybe srun doesn't transfer all settings from the head node > to the compute node. > The wget command works on frontend but doesn't work on the compute. > > mahmood@main-proxy:~$ wget google.com > --2020-08-02 16:05:55-- http://google.com/ > Resolving google.com (google.com)... 216.58.215.238, > 2a00:1450:400a:800::200e > Connecting to google.com (google.com)|216.58.215.238|:80... connected. > HTTP request sent, awaiting response... 301 Moved Permanently > Location: http://www.google.com/ [following] > --2020-08-02 16:05:55-- http://www.google.com/ > Resolving www.google.com (www.google.com)... 172.217.168.68, > 2a00:1450:400a:803::2004 > Connecting to www.google.com (www.google.com)|172.217.168.68|:80... > connected. > HTTP request sent, awaiting response... 200 OK > Length: unspecified [text/html] > Saving to: ‘index.html’ > > index.html [ <=> > ] 12.68K --.-KB/s in 0s > > 2020-08-02 16:05:56 (196 MB/s) - ‘index.html’ saved [12983] > > mahmood@main-proxy:~$ srun -p gpu_part --gres=gpu:titanv:1 --pty > /bin/bash > mahmood@fry0:~$ wget google.com > --2020-08-02 16:05:30-- http://google.com/ > Resolving google.com (google.com)... 216.58.215.238, > 2a00:1450:400a:800::200e > Connecting to google.com (google.com)|216.58.215.238|:80... ^C > mahmood@fry0:~$ > > > > > I will check the gateway with the admin. > Thanks for the hint. > > > > Regards, > Mahmood > > > > > On Sun, Aug 2, 2020 at 5:58 PM Renfro, Michael <ren...@tntech.edu> wrote: > >> 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: >> >> 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. >> >> 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? >> >> 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? >> >> Get Outlook for iOS <https://aka.ms/o0ukef> >> ------------------------------ >> *From:* slurm-users <slurm-users-boun...@lists.schedmd.com> on behalf of >> Mahmood Naderan <mahmood...@gmail.com> >> *Sent:* Sunday, August 2, 2020 7:52:52 AM >> *To:* Slurm User Community List <slurm-users@lists.schedmd.com> >> *Subject:* [slurm-users] Internet connection loss with srun to a node >> Hi >> 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 >> >> mahmood@main-proxy:~$ ping google.com >> PING google.com (216.58.215.238) 56(84) bytes of data. >> 64 bytes from zrh11s02-in-f14.1e100.net (216.58.215.238): icmp_seq=1 >> ttl=114 time=1.38 ms >> ^C >> --- google.com ping statistics --- >> 1 packets transmitted, 1 received, 0% packet loss, time 0ms >> rtt min/avg/max/mdev = 1.384/1.384/1.384/0.000 ms >> mahmood@main-proxy:~$ srun -p gpu_part --gres=gpu:titanv:1 --pty >> /bin/bash >> mahmood @fry0:~$ ping google.com >> PING google.com (216.58.215.238) 56(84) bytes of data. >> ^C >> --- google.com ping statistics --- >> 3 packets transmitted, 0 received, 100% packet loss, time 2026ms >> >> >> >> I guess that is related to slurm and srun. >> Any idea for that? >> >> >> >> >> >> >> >> Regards, >> Mahmood >> >> >>
