CentOS Monit | Continuous Learning

К уже рассмотренным системам мониторинга таких как Nagios , Zabbix , Munin добавим к рассмотрению легкую систему мониторинга Monit.

Официальный сайт Monit

Последняя версия monit доступна в репозитории DAG

Установка

# yum -y install monit

Проверяем версию

# rpm -qa | grep monit
monit-5.2.3-1.el5.rf

Прописываем в автозагрузку

# chkconfig monit on

Создаем папку

# mkdir /var/monit

В конфигурационном ( /etc/monit.conf )

set idfile /var/monit/id
set statefile /var/monit/state
include /etc/monit.d/*

Создаем главный конфигурационный файл следующего содержания

# vi /etc/monit.d/main.conf
set daemon  60 # check services at minute intervals
set logfile syslog facility log_daemon
set mailserver localhost
set eventqueue
basedir /var/monit
slots 100
set alert sysadm@foo.bar                       # receive all alerts
set alert manager@foo.bar only on { timeout }  # receive just service-timeout alert
check system test.bezha.od.ua
if loadavg (1min) > 4 then alert
if loadavg (5min) > 2 then alert
if memory usage > 75% then alert
if swap usage > 25% then alert
if cpu usage (user) > 70% then alert
if cpu usage (system) > 30% then alert
if cpu usage (wait) > 20% then alert

Создаем файл для мониторинга сервисов

Exim (/etc/monit.d/exim.conf)

check process exim with pidfile /var/run/exim.pid
start program = "/etc/init.d/exim stop"
stop program = "/etc/init.d/exim start"
if cpu > 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 300.0 MB for 5 cycles then restart
if children > 50 then restart
if failed port 25 protocol smtp then restart
if 5 restarts within 5 cycles then timeout
group mail

Dovecot (/etc/monit.d/dovecot.conf)

check process dovecot with pidfile /var/run/dovecot/master.pid
start program = "/etc/init.d/dovecot stop"
stop program = "/etc/init.d/dovecot start"
if cpu > 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 300.0 MB for 5 cycles then restart
if children > 50 then restart
if failed port 110 type TCP protocol POP then restart
if 5 restarts within 5 cycles then timeout
group mail

Proftpd (/etc/monit.d/proftpd.conf)

 
check process proftpd with pidfile /var/proftpd.pid
start program = "/etc/init.d/proftpd start"
stop program  = "/etc/init.d/proftpd stop"
if failed port 21 protocol ftp then restart
if 5 restarts within 5 cycles then timeout
group ftp

SSH (/etc/monit.d/ssh.conf)

check process sshd with pidfile /var/run/sshd.pid
start program = "/etc/init.d/sshd start"
stop program = "/etc/init.d/sshd stop"
if failed port 22 protocol ssh then restart
if 5 restarts within 5 cycles then timeout
group server

MySQL (/etc/monit.d/mysql.conf)

check process mysqld with pidfile /var/run/mysqld/mysqld.pid
start program = "/etc/init.d/mysqld start"
stop program = "/etc/init.d/mysqld stop"
if failed unixsocket /var/lib/mysql/mysql.sock protocol mysql then restart
if failed host localhost port 3306 protocol mysql then restart
if 5 restarts within 5 cycles then timeout
group database

PostgreSQL (/etc/monit.d/postgresql.conf)

check process postgres with pidfile /var/run/postmaster.5432.pid
start program = "/etc/init.d/postgresql start"
stop  program = "/etc/init.d/postgresql stop"
if failed unixsocket /tmp/.s.PGSQL.5432 protocol pgsql then restart
if failed host 127.0.0.1 port 5432 protocol pgsql then restart
if 5 restarts within 5 cycles then timeout
group database

Apache (/etc/monit.d/apache.conf)

check process apache with pidfile /var/run/httpd.pid
start program = "/etc/init.d/httpd start"
stop program  = "/etc/init.d/httpd stop"
if cpu > 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 500.0 MB for 5 cycles then restart
if children > 250 then restart
group www

Bind (chrooted) (/etc/monit.d/bind.conf)

 
check process named with pidfile /var/named/chroot/var/run/named/named.pid
start program = "/etc/init.d/named start"
stop program = "/etc/init.d/named stop"
if failed host 127.0.0.1 port 53 type tcp protocol dns then alert
if failed host 127.0.0.1 port 53 type udp protocol dns then alert
if 5 restarts within 5 cycles then timeout
group named

Файловые системы (/etc/monit.d/fs.conf)

check device rootfs with path /
start program  = "/bin/mount /"
stop program  = "/bin/mount -o remount,ro /"
if space usage > 80% for 5 times within 15 cycles then alert
if space usage > 99% then stop
if inode usage > 80% then alert
if inode usage > 99% then stop
group server

check device bootfs with path /boot
start program  = "/bin/mount /boot"
stop program  = "/bin/mount -o remount,ro /boot"
if space usage > 80% for 5 times within 15 cycles then alert
if space usage > 99% then stop
if inode usage > 80% then alert
if inode usage > 99% then stop
group server

Включаем Web-интерфейс в файле /etc/monit.d/main.conf

set httpd port 10001 and
use address 192.168.0.100
allow 192.168.0.1/24

Перезапускаем monit

# service monit restart

Заходим в http://192.168.0.100:10001

Если необходимо мониторить несколько серверов с одного web-интерфейса необходимо воспользоваться M/Monit

Скачиваем необходимую актуальную версию

# wget http://mmonit.com/dist/mmonit-2.3.2-linux-x86.tar.gz

Распакуем

# tar -xvf mmonit-2.3.2-linux-x86.tar.gz
# cd mmonit-2.3.2

Создаем папку и переносим mmonit в нее

# mkdir /usr/local/mmonit/
# mv * /usr/local/mmonit/

Создаем базу данных MySQL

# mysql -u root -p
mysql> CREATE DATABASE `mmonit`;
mysql> use mmonit
mysql> source /usr/local/mmonit/db/mmonit-schema.mysql
mysql> quit

Создаем пользователя и даем ему права на базу данных mmonit

# mysql -u root -p
mysql> GRANT ALL PRIVILEGES ON mmonit.* TO 'monit'@'localhost' IDENTIFIED BY 'password';
mysql> FLUSH PRIVILEGES;
mysql> QUIT;

Редактируем конфигурационный файл M/Monit (/usr/local/mmonit/conf/server.xml)

Realm url="mysql://monit:password@localhost/mmonit" 
minConnections="5" 
maxConnections="250" 
reapConnections="300"

Устанавливаем загрузочный скрипт

# cp /usr/local/mmonit/doc/startup/mmonit_init /etc/init.d/mmonit
# chmod 755 /etc/init.d/mmonit

Запускаем M/Monit

# /etc/init.d/mmonit start
Starting mmonit: mmonit.

Заходим по http://192.168.0.100:8080 логин/пароль admin/swordfish

Связываем monit с m\monit (в конфигурационном файле /etc/monit.d/main.conf)

set mmonit http://monit:monit@192.168.0.100:8080/collector
set httpd port 2812 and use address 192.168.0.100
allow localhost
allow 192.168.0.100
allow admin:swordfish

Для простоты понимания схема

Hosts

Status test.bezha.od.ua