this post was submitted on 07 Nov 2024
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Proxmox Backup Server network traffic (programming.dev)
submitted 1 week ago by shiftymccool@programming.dev to c/selfhosted@lemmy.world
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Hey all! I'm running Proxmox VE with the tteck PBS LXC and I can't figure out why there is this constant network traffic on PBS. I have backups set to run in the early morning and the screenshot is from when it should be idle. Any ideas? I know I'm not providing much info here so any clarifying questions are welcome since I don't know what would be important for troubleshooting. Thanks!

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[–] DeltaTangoLima@reddrefuge.com 12 points 1 week ago* (last edited 1 week ago) (1 children)

Hmmm - interesting. I hadn't bothered to check before now, but I'm seeing something similar on one of the two PBS CTs I run.

Comparing the output of netstat -lantop on both CTs, I can see that the one with more outbound traffic has more waiting connections from localhost on port 82, the port Proxmox Backup Servers provides its API over:

tcp        0      0 127.0.0.1:51562         127.0.0.1:82            TIME_WAIT   -                    timewait (40.38/0/0)
tcp        0      0 127.0.0.1:56342         127.0.0.1:82            TIME_WAIT   -                    timewait (29.92/0/0)
tcp        0      0 127.0.0.1:44864         127.0.0.1:82            TIME_WAIT   -                    timewait (58.94/0/0)
tcp        0      0 127.0.0.1:45028         127.0.0.1:82            TIME_WAIT   -                    timewait (11.88/0/0)
tcp        0      0 127.0.0.1:44026         127.0.0.1:82            TIME_WAIT   -                    timewait (48.66/0/0)
tcp        0      0 127.0.0.1:44852         127.0.0.1:82            TIME_WAIT   -                    timewait (58.80/0/0)
tcp        0      0 127.0.0.1:59620         127.0.0.1:82            TIME_WAIT   -                    timewait (0.00/0/0)
tcp        0      0 127.0.0.1:56374         127.0.0.1:82            TIME_WAIT   -                    timewait (30.98/0/0)
tcp        0      0 127.0.0.1:51544         127.0.0.1:82            TIME_WAIT   -                    timewait (39.98/0/0)
tcp        0      0 127.0.0.1:59642         127.0.0.1:82            TIME_WAIT   -                    timewait (0.00/0/0)
tcp        0      0 127.0.0.1:45008         127.0.0.1:82            TIME_WAIT   -                    timewait (10.92/0/0)
tcp        0      0 127.0.0.1:45016         127.0.0.1:82            TIME_WAIT   -                    timewait (11.76/0/0)

I'm wondering if the graph is pulling aggregated network data, including the loopback interface. If so, and it's all just port 82 stuff on 127.0.0.1, then it's probably nothing to worry about.

Edit: found this forum post that seems to indicate it's aggregating all the byte values from /proc/dev/net, so this is probably nothing to worry about if your netstat output, like mine, only shows API conections to/from 127.0.0.1 on port 82.

[–] shiftymccool@programming.dev 5 points 1 week ago

Yep, I think you're spot on! Glad I asked, I don't think I would've ever thought of that. Thanks!