Kallobombus Monit

I use Monit for some monitoring Kallobombus. This page lists the important stuff I changed. Don’t forget to sudo service monit restart after making changes. See 2014-12-20 Monit for more.

set alert alex@gnu.org

Right. I want to get my email.

set httpd port 2812 and
    SSL ENABLE
    PEMFILE /etc/ssl/localcerts/monit.pem
    allow admin:*secret*

Set password. Install a certificate. This makes sure that you can connect to your server via HTTPS, eg. https://alexschroeder.ch:2812/ and log in using the username and password given.

In /etc/ssl/localcerts I have a README:

https://wiki.debian.org/Self-Signed_Certificate
https://www.howtoforge.com/server-monitoring-with-munin-and-monit-on-debian-wheezy-p2

openssl req -new -x509 -days 365 -nodes -config monit.cnf -out monit.pem -keyout monit.pem
sudo chown root.root monit.pem
sudo chmod 0700 monit.pem
sudo service monit restart

The content of monit.cnf:

1. http://www.howtoforge.com/server-monitoring-with-munin-and-monit-on-debian-wheezy-p2
1. create RSA certs - Server

RANDFILE = ./openssl.rnd

[ req ]
default_bits = 2048
encrypt_key = yes
distinguished_name = req_dn
x509_extensions = cert_type

[ req_dn ]
countryName = Country Name (2 letter code)
countryName_default = CH

stateOrProvinceName             = State or Province Name (full name)
stateOrProvinceName_default     = Zürich

localityName                    = Locality Name (eg, city)
localityName_default            = Zürich

organizationName                = Organization Name (eg, company)
organizationName_default        = Alex Schroeder

organizationalUnitName          = Organizational Unit Name (eg, section)
organizationalUnitName_default  = Head Desk

commonName                      = Common Name (FQDN of your server)
commonName_default              = alexschroeder.ch

emailAddress                    = Email Address
emailAddress_default            = alex@gnu.org

[ cert_type ]
nsCertType = server

Result:

Load CPU Memory Swap
[0.49] [0.46] [0.46] 34.6%us, 0.9%sy, 0.0%wa 15.0% [78680 kB] 99.8% [2044 kB]

Chrome

Getting Chrome to accept self-signed localhost certificate

What I did on OSX was copy the monit.pem file to my local filesystem, opened it using Keychain added is to “System”, edited it, and set the Trust to “Always Trust”. Restart Chrome and now it seems to work.

Shared Host

check system Kallobombus
  if loadavg (1min) > 4 then alert
  if loadavg (5min) > 2 then alert
  if memory usage > 75% then alert
1. if swap usage > 25% then alert
  if cpu usage (user) > 90% then alert
  if cpu usage (system) > 30% then alert
  if cpu usage (wait) > 20% then alert

On the host I’m on, swap seems to be hover around 98% at all times. That’s why I commented the swap line. I also increased user cpu usage from 70% to 90% because I was getting too many alerts.

Update: Actually, I sometimes wake up with 30 mails where Monit tells me that the resource limits have been reached. :(

Sendmail

I also created /etc/monit/conf.d/sendmail as follows:

check process sendmail with pidfile /var/run/sendmail/mta/sendmail.pid
   group mail
   start program = "/etc/init.d/sendmail start"
   stop  program = "/etc/init.d/sendmail stop"
1.  if failed port 25 protocol smtp then restart
   if 5 restarts within 5 cycles then timeout
   depends on sendmail_bin
   depends on sendmail_rc

1. /usr/lib/sendmail points to /etc/alternatives/lib.sendmail which in
1. turn points to the file tested:

check file sendmail_bin with path /usr/lib/sm.bin/sendmail
   group mail
   if failed checksum        then unmonitor
   if failed permission 2755 then unmonitor
   if failed uid root        then unmonitor
   if failed gid smmsp       then unmonitor

check file sendmail_rc with path /etc/init.d/sendmail
   group mail
   include /etc/monit/templates/rootbin

I just used pid location, permission 2755 and group smmsp from the setup as it is right now, which is what Debian Wheezy uses by default, I guess. I commented testing of port 25 because I was getting a lot of “[127.0.0.1] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA-v4” lines from logcheck via mail and I think this is Monit testing port 25.

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