Nagios not sending emails

[Darth_Panda]

Hi Guys,

I have taken over a Linux Wheezy box with Nagios and Cactii. The last administrator has left. Email alerts no longer work. Telnet reveals that Exim is listening on port 25. Here is Exim's log. How do I fix this so I can get email alerts again?

2015-06-28 06:25:06 1Z8wev-0006Te-Ia <= root@watchtower U=root P=local S=901
2015-06-28 06:25:06 1Z8wev-0006Te-Ia ** alecsu@watchtower <root@watchtower>: Unrouteable address
2015-06-28 06:25:06 1Z8wew-0006Ti-Kl <= <> R=1Z8wev-0006Te-Ia U=Debian-exim P=local S=1727
2015-06-28 06:25:06 1Z8wev-0006Te-Ia Completed
2015-06-28 06:25:06 1Z8wew-0006Ti-Kl ** alecsu@watchtower <root@watchtower>: Unrouteable address
2015-06-28 06:25:06 1Z8wew-0006Ti-Kl Frozen (delivery error message)
2015-06-28 06:39:02 1Z8wsQ-0003lI-6s <= root@watchtower U=root P=local S=869
2015-06-28 06:39:02 1Z8wsQ-0003lI-6s ** alecsu@watchtower <root@watchtower>: Unrouteable address
2015-06-28 06:39:03 1Z8wsQ-0003lO-V8 <= <> R=1Z8wsQ-0003lI-6s U=Debian-exim P=local S=1695
2015-06-28 06:39:03 1Z8wsQ-0003lI-6s Completed
2015-06-28 06:39:03 1Z8wsQ-0003lO-V8 ** alecsu@watchtower <root@watchtower>: Unrouteable address
2015-06-28 06:39:03 1Z8wsQ-0003lO-V8 Frozen (delivery error message)
2015-06-28 06:49:17 Start queue run: pid=30675
2015-06-28 06:49:17 1Z8YWk-0002Ym-7h Message is frozen
2015-06-28 06:49:17 1Z8MLu-0001wZ-D5 Message is frozen
2015-06-28 06:49:17 1Z8Nl1-0005LO-11 Message is frozen
2015-06-28 06:49:17 1Z8uXG-00010e-A0 Message is frozen
2015-06-28 06:49:17 1Z8SRK-0002JC-Aq Message is frozen
2015-06-28 06:49:17 1Z8ck2-00045e-BP Message is frozen
2015-06-28 06:49:17 1Z8iMQ-0000Rr-W9 Message is frozen
2015-06-28 06:49:17 1Z8GGU-0007ZP-QW Message is frozen
2015-06-28 06:49:17 1Z8htO-0004xy-EP Message is frozen
2015-06-28 06:49:17 1Z8Zvq-0005sI-Oh Message is frozen
2015-06-28 06:49:17 1Z8ZSo-0001yL-7q Message is frozen
2015-06-28 06:49:17 1Z8ErO-0004A7-FW Message is frozen
2015-06-28 06:49:17 1Z8JXi-0003dD-N5 Message is frozen
2015-06-28 06:49:17 1Z8Mow-0005uk-U3 Message is frozen
2015-06-28 06:49:17 1Z8lde-0002Xf-MT Message is frozen
2015-06-28 06:49:17 1Z8Dhn-0007S7-Py Unfrozen by errmsg timer
2015-06-28 06:49:17 1Z8Dhn-0007S7-Py ** alecsu@watchtower <root@watchtower>: Unrouteable address
2015-06-28 06:49:17 1Z8Dhn-0007S7-Py alecsu@watchtower <root@watchtower>: error ignored
2015-06-28 06:49:17 1Z8Dhn-0007S7-Py Completed
2015-06-28 06:49:17 1Z8jIU-0008I4-R5 Message is frozen
2015-06-28 06:49:17 1Z8Ibe-0004Dm-Tk Message is frozen
2015-06-28 06:49:17 1Z8WBa-0008J6-8v Message is frozen
2015-06-28 06:49:17 1Z8rG2-0007Kj-UN Message is frozen
2015-06-28 06:49:17 1Z8wPO-0008FB-4H Message is frozen
2015-06-28 06:49:17 1Z8KTm-00035u-Ei Message is frozen

Thanks

[Darth_Panda]

Hi Guys,

I took over a Debian Wheezy box from another administrator that has Nagios and Cactii. I think he must have deleted his Exim account or something because emails no longer work. I have made the correct adjustments in Nagios SQL, but there seems to be another issue. Anyone ever used Exim with Nagios and know how to trouble shoot?

Thanks,

[jdalrymple]

2015-06-28 06:25:06 1Z8wev-0006Te-Ia ** alecsu@watchtower <root@watchtower>: Unrouteable address

What do you get when you `ping watchtower`?

My guess is that your mail server's "FQ"DN changed. To conform to RFC's I think you need to put in your suffix also - but realistically I guess it should work if it's not there depending on how fussy of an MTA Exim is.

[Darth_Panda]

root@watchtower:~# ping watchtower
PING watchtower (172.16.1.231) 56(84) bytes of data.
From 172.16.1.98 icmp_seq=1 Destination Host Unreachable
From 172.16.1.98 icmp_seq=2 Destination Host Unreachable
From 172.16.1.98 icmp_seq=3 Destination Host Unreachable
From 172.16.1.98 icmp_seq=4 Destination Host Unreachable
From 172.16.1.98 icmp_seq=5 Destination Host Unreachable
From 172.16.1.98 icmp_seq=6 Destination Host Unreachable
From 172.16.1.98 icmp_seq=7 Destination Host Unreachable
From 172.16.1.98 icmp_seq=8 Destination Host Unreachable
From 172.16.1.98 icmp_seq=9 Destination Host Unreachable

[lmiltchev]

Hostname should resolve. Run the following commands and show us the output:

Code: Select all

hostname
hostname -i
echo "test mail." | mail -s Test root@watchtower

[Darth_Panda]

Thanks, here it is. Something is definitely wrong because it should be a 172.16.1.98 address. How do I change the host record?

Last login: Tue Jun 30 21:35:52 2015 from 172.16.1.90
root@watchtower:~# hostname
watchtower
root@watchtower:~# hostname -i
172.16.1.231
root@watchtower:~# echo "test mail." | mail -s Test root@watchtower

[jdalrymple]

Admittedly you have me confused.

According to your log output it appears that you're trying to send E-mail to a host named "watchtower" - it also appears that watchtower is your Nagios host. Is your Nagios box also your mail server?

Also - yes your host resolution is messed up. Either you have a bad entry in your /etc/hosts file or your DNS is broken.

Code: Select all

root@watchtower:~# ping watchtower
PING watchtower (172.16.1.231) 56(84) bytes of data.
From 172.16.1.98 icmp_seq=1 Destination Host Unreachable

Your watchtower host is at 172.16.1.98 but is resolving itself to 172.16.1.231.

show us the contents of /etc/hosts

[Darth_Panda]

Sorry for the delay, here it is;

Code: Select all

127.0.0.1       localhost
172.16.1.231    watchtower

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

[jdalrymple]

Is that watchtower line correct? It doesn't seem so based upon your earlier diagnostics...

If it's not correct - correct it.

If you can (meaning if DNS works in your environment) remove it entirely.

The Domain Name System, first described in 1983 and implemented in 1984,[1] automated the publication process and provided instantaneous and dynamic hostname resolution in the rapidly growing network.

[Darth_Panda]

Thanks, I have decided to decommission this server. I am setting up a new Nagios server so I will be setting up email from scratch.