Network statistics are not collected when alias interfaces are present on the system

[pdcleyn]

Bug report

Relevant telegraf.conf:

[global_tags]


[agent]
  interval = "10s"
  round_interval = true

  metric_batch_size = 1000

  metric_buffer_limit = 10000

  collection_jitter = "0s"

  flush_interval = "10s"
  flush_jitter = "0s"

  precision = ""

  debug = true
  quiet = false
  logfile = "/var/log/telegraf/telegraf.log"

  hostname = ""
  omit_hostname = false
  
[[outputs.file]]
  files = ["stdout", "/tmp/metrics.out"]
  

[[inputs.net]]

System info:

[ root@HOST ~]# rpm -qa | grep telegraf
telegraf-1.1.1-1.x86_64
[ root@HOST ~]# cat /etc/redhat-release
CentOS release 6.8 (Final)
[ root@HOST ~]# uname -a
Linux HOST 2.6.32-642.13.1.el6.x86_64 #1 SMP Wed Jan 11 20:56:24 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[ root@HOST ~]#

Steps to reproduce:

Create a network interface and an alias interface on top, following files can be used on a RHEL6 system:

/etc/sysconfig/network-scripts/ifcfg-tun10

OWNER=nobody
NOZEROCONF=yes
IPV6INIT=yes
USERCTL=no
VLAN=no
BOOTPROTO=static
TYPE=Tap
ONBOOT=yes
DEVICE=tun10

/etc/sysconfig/network-scripts/ifcfg-tun10:10

OWNER=nobody
NOZEROCONF=yes
IPV6INIT=yes
USERCTL=no
VLAN=no
BOOTPROTO=static
TYPE=Tap
ONBOOT=yes
DEVICE=tun10:1
NAME=tun10:1

Activate the interfaces:
ifup tun10
ifup tun10:1

/proc/net/dev should now contain the new interfaces:

[root@host ~]# cat /proc/net/dev
Inter-|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
    lo: 1638928809 4771634    0    0    0     0          0         0 1638928809 4771634    0    0    0     0       0          0
  eth0: 1000866899965 764654426    0    0    0     0          0         0 1267144066 5373060    0    0    0     0       0          0
tun10:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          0
tun10:1:       0       0    0    0    0     0          0         0        0       0    0    0    0     0       0          

Restart telegraf

Expected behavior:

Interface statistics for the new interfaces and all other existing interfaces should be gathered.

Actual behavior:

An error is thrown in /var/log/telegraf/telegraf.log and no interface statistics are gathered:

2017/02/16 03:38:00 E! ERROR in input [inputs.net]: error getting net io info: strconv.ParseUint: parsing "2:": invalid syntax

Additional info:

Error is caused by a parse issue in the upstream shizou/gopsutils package. I created a PR to address this issue.

[danielnelson]

@pdcleyn We are using a version of gopsutil with your fix in it, so I believe this bug is fixed. Please reopen if there are still issues.