Server cannot contact agent running in localhost!?

[jbatista]

Hi everyone,

I'm running Zabbix server and agent on localhost with a Ubuntu Karmic Linux (release 9.10) desktop as I'm trying to learn about it by experimenting. The server and agent versions are 1:1.6.4-2build1. Installation (apt-get install) went without a problem. Everything seems to be almost working.

Except for the server not being able to monitor the agent on localhost (127.0.0.1). On the web interface, the Configuration->Hosts show 1 host (localhost) with IP=127.0.0.1 and Port=10050, using Template_Linux. The status says "Monitored", but availablity="Not available" and the error message is:

Got empty string from [127.0.0.1]. Assuming that agent dropped connection because of access permissions

I've tried to switch off the Ubuntu Uncomplicated FireWall (ufw), and it makes no difference, so I guess it's not coming from the firewall.

Relevant file contents follows:
zabbix_server.conf

ListenPort=10051
ListenIP=127.0.0.1
SenderFrequency=30
DebugLevel=3
Timeout=5
PidFile=/var/run/zabbix-server/zabbix_server.pid
LogFile=/var/log/zabbix-server/zabbix_server.log

zabbix_agend.conf

Server=localhost
Timeout=3

Sample from zabbix_server.log:

7382:20100423:150406 Item [localhost:agent.ping] error: Got empty string from [127.0.0.1]. Assuming that agent dropped connection because of access permissions

Sample from zabbix_agentd.log:

7491:20100423:145156 zabbix_agentd active check started [localhost:10051]

Output from zabbix_agent -t system.uptime:

user@ubuntu:~$ zabbix_agent -t system.uptime
system.uptime [u|10704]
user@ubuntu:~$ telnet localhost 10051
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
system.uptime
Connection closed by foreign host.
user@ubuntu:~$

Content of /etc/hosts:

127.0.0.1 localhost
127.0.1.1 ubuntu

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

Has anyone faced this problem with the Ubuntu 9.10 ("Karmic Koala") Linux distro? Are there any settings that have to be performed outside of the installation through apt-get install? I'm using apache2 and mysql on the same machine.

I'll provide further information on request.
Thank you in advance for your feedback!

[jbatista]

Solution

Don't you just love when you answer your own question (and RTFM)? ...

I've found this post: http://www.zabbix.com/forum/showthread.php?t=11329
Therefore, I edited the zabbix_agentd.conf file and changed

Server=localhost

to

Server=127.0.0.1

(didn't even had to provide an IPv6 address instead). I restarted the agentd and it now works , the Configuration->Hosts lists now localhost with Availability="Available" and the error="-".

Hopes this helps others!

[Martin Mspace]

zabbix server not receiving data from agent

I spent almost two days trying to resolve and issue with my zabbix server not receiving data from an agent in another server.
I have solved the issue by editing my zabbix-agent.conf file Hostname from using address like myip.address.com to the real ip as 192.168.6.5.

I checked that the issue was caused by my server conf file in /etc/hosts that had been changed by another guy to the gateway ip instead of the real ip that the hostname should resolve like this:
192.168.1.9 myip.address.com and hence 'myip.address.com' resolve to wrong ip address which i noted lately after solving the issue as above.