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I am trying to make my munin master fetch data from another external munin-node. But I seems to be running into problems. The Munin master exist at 10.0.0.4, while the external node is at 10.0.0.1. I am trying to make 10.0.0.4 fetch the data from 10.0.0.1.

I believe I have set up the configuration correctly:

Edited /etc/munin/munin.conf on the munin_master to make it fetch data from 10.0.0.1.

[muninServer.vm] 
address 10.0.0.1 
use_node_name yes

Restarted Munin and apache on munin_master.

/etc/init.d/munin-node restart
* Stopping Munin-Node    [ OK ]
 * Starting Munin-Node     [ OK ]

Also restarted apache2 on munin_master 

/etc/init.d/apache2 restart

On the external munin-node edited /etc/munin/munin-node.conf, to allow the munin_master to collect the files from the external munin-node. 

allow ^10\.0\.0\.4$

Also restarted munin. 

/etc/munin# /etc/init.d/munin-node restart
 * Stopping Munin-Node             [ OK ]
 * Starting Munin-Node               [ OK ]

This seems to work fine for munin_master. However, when Munin master tries to establish a new connection with 10.0.0.1 on port 4949(by sending a SYN bit). The external node refuses the connection and responds with a reset bit. Since the external node is specified to accept this connection, I don’t see why this happens.

My local firewall at 10.0.0.1 accept all traffic in by default. So this cannot be the reason:

iptables -L Chain INPUT (policy ACCEPT) target     prot opt source     destination

Chain FORWARD (policy ACCEPT) target     prot opt source               destination

Chain OUTPUT (policy ACCEPT) target     prot opt source               destination

Might be important to note that using: telnet 127.0.0.1 4949 on the external node works fine, while using telnet 10.0.0.1 4949 on the munin_master is being refused.

Trying to find out if the port is listening on the external node:

lsof | grep TCP | grep LISTEN
munin-nod  4669             root    5u     IPv4            2095805      0t0        TCP localhost:munin (LISTEN)

netstat -tulpn
Proto  Recv-Q      Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0             0             127.0.0.1:4949          0.0.0.0:*                LISTEN      4669/perl

The content on the information in munin-node.conf on the external node. 

log_level 4
log_file /var/log/munin/munin-node.log
pid_file /var/run/munin/munin-node.pid
background 1
setsid 1
user root
group root

ignore_file [\#~]$
ignore_file DEADJOE$
ignore_file \.bak$
ignore_file %$
ignore_file \.dpkg-(tmp|new|old|dist)$
ignore_file \.rpm(save|new)$
ignore_file \.pod$

allow ^127\.0\.0\.1$
allow ^::1$
allow ::ffff:158.36.119.179
allow ^10\.0\.0\.4$
allow ^128\.39\.74\.58$

host 127.0.0.1
host ::ffff:158.36.119.179

port 4949

Any suggestion to how to fix this problem would be greatly appreciated :)

Madde
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1 Answers1

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On node 10.0.0.1, type $ tail -f /var/log/munin/munin-node.log then press enter a couple of times to clear the screen. This is only for you to see the new results.

In another window, go to node 10.0.0.4, and type $ telnet 10.0.0.1 4949 and see if the answer to your conundrum is in one of the windows.

user176717
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