Parse ipv6 addresses in ipvs backend status about procfs HOT 10 CLOSED

Interesting, what kernel version are you using? The current code parses IPv6 via the same hex format.

from procfs.

@matthiasr, where did you find the sample of a /proc/net/ip_vs that contained an IPv6 in the format of DEADBEEF000000000000000000000001:1F90?

from procfs.

I don't remember I'm afraid. I hope I configured this on some machine and this is what I got …

from procfs.

Actually, reading prometheus/node_exporter#67 I don't think I did. I had no IPv6 example to work off and it probably never worked this way.

from procfs.

Paging @juliusv who, if I remember correctly, had a hand or two in the IPv6 support for IPVS :)

from procfs.

@SuperQ these machines run a mix of 4.4 and 4.9 though IIRC we've seen the same with older kernels e.g. 3.16

from procfs.

@matthiasr I didnt touch this procfs file back then, but I added a Generic Netlink interface to read and write IPVS configs (which was needed because the old sockopt-based interface couldn't accommodate v6 addresses). You can take a look at what the Netlink interface looks like today, maybe it can give you the same answers: https://github.com/torvalds/linux/blob/ca78d3173cff3503bcd15723b049757f75762d15/net/netfilter/ipvs/ip_vs_ctl.c#L2836

https://github.com/torvalds/linux/blob/5924bbecd0267d87c24110cbe2041b5075173a25/include/uapi/linux/ip_vs.h#L279

from procfs.

Hokay, I have no idea what how to read those 😆

If the [aaaa:bbbb:…] format is what actually exists in the wild I'm inclined to just roll with it

from procfs.

SGTM

from procfs.

Confirmed working, thanks a lot @matthiasr ! I've opened prometheus/node_exporter#576 to add this to node_exporter

from procfs.