Monit with Ubuntu 9.10
- Problem
- Solution
- Configuration
  - Example
  - More functions
- Links

Monit with Ubuntu 9.10

Using an old configuration without rewriteing it can be causes some problems.
Ubuntu 9.10 (monit version: “5.0.x” and 8.04 version: “4.8.x”).

Website: mmonit.com

Problem

Monit won't start

Solution is very simple but wasn't needed since the new version.
I compared my configuration with this here and of course I found differences.

In Ubuntu 8.04 monit checks about 3-5 minutes.
In Ubuntu 9.10 the same configuration won't start.

Solution

Enter the interval for checking and postfix starts, but it doesn't send any mail.
if you have an local postfix configured set the mail server to localhost.

Configuration

Monit must be activated in
```
/etc/default/monit
```

What do the configuration lines:

...
set daemon 120 # check every 120 seconds
...
check process sshd with pidfile /var/run/sshd.pid # check the process which is running with the given pid-file
   start program  "/etc/init.d/ssh start"         # if monit must restart the daemon which script must be used to start or stop
   stop program  "/etc/init.d/ssh stop"
   if failed port 22 protocol ssh then restart    # if port 22 is unaccessible then restart the daemon
   if 5 restarts within 5 cycles then timeout     # if restart fail 5 times then give up

Example

monit.rc

#############################################################
##
# Email fuer Alerts
set daemon 120
set mailserver localhost
set mail-format {
   from: server@example.com
   subject: [$ACTION] $HOST $SERVICE $EVENT - monit
}
set alert admin@example.com
##
#############################################################
## fill level
##
## fill level boot-partition
check device bootfs with path /dev/sda1
    if space usage > 80% then alert
##
#############################################################
## Security Checks
##
## /etc
check directory etc with path /etc
  if changed timestamp then alert
#############################################################
## essential Services
##
## ssh
check process sshd with pidfile /var/run/sshd.pid
   start program  "/etc/init.d/ssh start"
   stop program  "/etc/init.d/ssh stop"
   if failed port 22 protocol ssh then restart
   if 5 restarts within 5 cycles then timeout
##
## cron
check process cron with pidfile /var/run/crond.pid
   alert admin@example.com only on { nonexist }
   group system
   start program = "/etc/init.d/cron start"
   stop  program = "/etc/init.d/cron stop"
   if 5 restarts within 5 cycles then timeout
##

More functions

Monit with webinterface

You can activate a small webserver in monit so you can monitor your services via http

set httpd port 8080 and use address 192.168.1.100
 allow admin:password

Perhaps you can also use ssl but I don't tested it (See here)

set httpd port 2812 and
     SSL ENABLE
     PEMFILE  /var/certs/monit.pem
     allow admin:test

Check other Server

Check an Webinterface

check host webserver.example.org with address webserver.example.org if failed port 80 protocol http for 5 cycles then alert

Check if Server can be reached via icmp (ping)

check host switch.example.org with address switch.example.org if failed icmp type echo count 5 with timeout 15 seconds then alert

Table of Contents

Monit with Ubuntu 9.10

Problem

Solution

Configuration

Example

More functions

Monit with webinterface

Check other Server

Links