CODEWITHSUNDEEP
zabbix
user3223819
user3223819

Reputation: 43

zabbix agent no network data - unless sudo

I have been using Zabbix for about 2 weeks and think it's great.

My set up: Server: Zabbix 2.2 Appliance Clients: Ubuntu 12.04 Precise Server 64bit

I have installed the Zabbix agent (zabbix-agent_2.2.0-1+precise_amd64.deb ) using dpkg and normally after an hour - discovery populates more items for the servers and this includes Network interfaces and utilisation.

I have 1 server where this has not worked. All other data, CPU, memory, filesystems have come in but NOT network.

I have been trying to use the agent command to troubleshoot:

    $ zabbix_agentd -t "system.cpu.load[all,avg1]"
    system.cpu.load[all,avg1] [d|0.240000]

Where as the network fails:

    $ zabbix_agentd -t "net.if.in[eth0]"
    net.if.in[eth0] [m|ZBX_NOTSUPPORTED]

But if I run it as sudo it works...

    $ sudo zabbix_agentd -t "net.if.in[eth0]"
    [sudo] password for jsm:
    net.if.in[eth0] [u|27166807]

Do I have to change the permissions of something to get this working?

I've posted on the Zabbix forum - and no new ideas have come forward. Thank you

Further info on the host where this is happening: This 1 server is a little different. It is a hosted server, where you select the OS you want and they build it and send you root credentials to then use as you wish.

I have noticed on this server that ifconfig does not give the usual output, instead it replies with: Warning: cannot open /proc/net/dev (No such file or directory). Limited output.

If I run sudo ifconfig then the output is normal: eth0 Link encap:Ethernet HWaddr 00:1c:c0:ec:..... etc

Other info on the server: $ zabbix_agent -V Zabbix agent v2.2.0 (revision 40163) (12 November 2013) Compilation time: Nov 12 2013 12:23:06

$ sudo groups zabbix zabbix : zabbix

$ sudo ls -als /proc/net/dev 0 -r--r--r-- 1 root root 0 Jan 28 11:48 /proc/net/dev

$lsb_release -irc Distributor ID: Ubuntu Release: 12.04 Codename: precise

Upvotes: 1

Views: 9824

Answers (3)

user3223819
user3223819

Reputation: 43

In the end I did get this working by booting a non GRS kernel as described here. Thanks Michael for the nudges.

http://neuro.me.uk/blog/2009/09/20/revert-to-standard-ubuntu-kernel-on-ovh-or-kimsufi-servers

Short version:

apt-get install linux-image-server
mkdir ~/ovh.d
mv /etc/grub.d/06_OVHkernel ~/ovh.d
update-grub
shutdown -r -f now

And now the stats come through fine.

Upvotes: 1

griotteau
griotteau

Reputation: 1822

I you don't want to change your kernel :

Create a new script directory :

mkdir /etc/zabbix/root
chown root.zabbix /etc/zabbix/root
chmod 750 /etc/zabbix/root

Add this line to /etc/sudoers :

zabbix  ALL=(ALL) NOPASSWD: /etc/zabbix/root/*.sh

Create /etc/zabbix/root/net-if-in.sh :

 cat /proc/net/dev | grep $INTERFACE |  awk '{ print $2; }'

Create /etc/zabbix/root/net-if-out.sh :

 cat /proc/net/dev | grep $INTERFACE |  awk '{ print $10; }'

Add this 2 lines to zabbix_agentd.conf :

UserParameter=net-if-in[*], sudo /etc/zabbix/root/net-if-in.sh $1
UserParameter=net-if-out[*], sudo /etc/zabbix/root/net-if-out.sh $1

Test it :

sudo -u zabbix zabbix_agentd -t "net-if-in[eth0]"

Restart the agent, add the new items in zabbix server !

Upvotes: 1

Michael Tabolsky
Michael Tabolsky

Reputation: 3577

This has nothing to do with zabbix as you can clearly see. This is a "problem" with the server and not even with the "OS" but with the platform. What you describe seems to be some pseudo virtualization container like OpenVZ or some weird kernel patch. I try my best to avoid these so can't advice anything specific. But start from getting the information about the platform.

Edit: the "weird patch" appears to be the grsecurity.

Upvotes: 0

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