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Top Forums UNIX for Advanced & Expert Users Negative values for peer inodes in ss -x output Post 303046271 by Skrynesaver on Wednesday 29th of April 2020 07:45:11 AM
Old 04-29-2020
Negative values for peer inodes in ss -x output

Hi all,

Long time no see, love what you've done with the place, been a while and asked this in the wrong forum initially...

I'm wondering how to interpret negative values for local and peer inode values for Unix sockets?

Code:
Netid  State      Recv-Q Send-Q Local Address:Port                 Peer Address:Port
...
u_str  ESTAB      0      0      /var/run/docker.sock -1847002447           * -1846996756

I can trace the local/peer relationship in the ss -xpan output for example...
grepping out known a negative inode id I get
Code:
# ss -xp | grep --  -1841560902
u_str  ESTAB      0      0      /var/run/docker.sock -1841556763           * -1841560902           users:(("dockerd",pid=29490,fd=276))
u_str  ESTAB      0      0      *                    -1841560902           * -1841556763           users:(("metricbeat",pid=5712,fd=94)

Then looking at the proc entry for the metricbeat process I get a non-negative inode for fd 94.
Code:
# ls -l /proc/5712/fd/
...
lrwx------ 1 root root 64 Apr 28 12:00 94 -> socket:[2453406394]

I'm curious as to the relationship (if any) between the "real" inode value and the negative value used for the inode in the ss output , what circumstances this value is used in (despite there being an inode for the symlink in /proc ) and general wisdom on the subject.

Thanks, Skrynesaver
 

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LSNS(8) 						       System Administration							   LSNS(8)

NAME
lsns - list namespaces SYNOPSIS
lsns [options] [namespace] DESCRIPTION
lsns lists information about all the currently accessible namespaces or about the given namespace. The namespace identifier is an inode number. The default output is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns by using the --output option together with a columns list in environments where a stable output is required. Note that lsns reads information directly from the /proc filesystem and for non-root users it may return incomplete information. The cur- rent /proc filesystem may be unshared and affected by a PID namespace (see unshare --mount-proc for more details). lsns is not able to see persistent namespaces without processes where the namespace instance is held by a bind mount to /proc/pid/ns/type. OPTIONS
-J, --json Use JSON output format. -l, --list Use list output format. -n, --noheadings Do not print a header line. -o, --output list Specify which output columns to print. Use --help to get a list of all supported columns. The default list of columns may be extended if list is specified in the format +list (e.g. lsns -o +PATH). -p, --task pid Display only the namespaces held by the process with this pid. -r, --raw Use the raw output format. -t, --type type Display the specified type of namespaces only. The supported types are mnt, net, ipc, user, pid, uts and cgroup. This option may be given more than once. -u, --notruncate Do not truncate text in columns. -V, --version Display version information and exit. -h, --help Display help text and exit. AUTHORS
Karel Zak <kzak@redhat.com> SEE ALSO
nsenter(1), unshare(1), clone(2), namespaces(7) AVAILABILITY
The lsns command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/. util-linux December 2015 LSNS(8)

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