net-snmpをインストール
これが無いと始まらないよ！
shell
$ yum install -y net-snmp*
デーモン登録
shell
$ systemctl enable snmpd.service
$ systemctl list-unit-files snmpd.service
コンフィグ設定
shell
$ vi /etc/snmp/snmpd.conf
### snmpd.conf ここから ########################################
#以下のサンプル設定をコメントアウト
# com2sec notConfigUser default public
# group notConfigGroup v1 notConfigUser
# group notConfigGroup v2c notConfigUser
# view systemview included .1.3.6.1.2.1.1
# view systemview included .1.3.6.1.2.1.25.1.1
# access notConfigGroup "" any noauth exact systemview none none
#以下を追加
# 必要に応じてサブネットのアドレスとユーザを追加してください
com2sec local localhost private
group MyRWGroup v1 local
group MyRWGroup v2c local
group MyRWGroup usm local
#以下のコメントを外す
view all included .1 80
access MyROGroup "" any noauth 0 all none none
access MyRWGroup "" any noauth 0 all all all
disk / 10%
#以下のコメントを外す
load 12 14 14
#mysqlのレプリケーションチェック用のスクリプト
exec mysqlSlaveRunning /usr/local/snmp/check_slave_running.sh
### snmpd.conf ここまで ########################################
mysqlSlaveRunningのスクリプト設置
shell
$ mkdir -p /usr/local/snmp/
$ vi /usr/local/snmp/check_slave_running.sh
### スクリプト ここから ########################################
#!/bin/sh
mysql=/var/lib/mysql
user=root
password=***
running=`${mysql} -u${user} -p${password} -e "SHOW SLAVE STATUS\G" | grep "Slave.*Running"`
much=`expr index "$running" "No"`
if [ $much -eq 0 ];
then
echo "Slave is Running!"
exit 0
else
echo "Slave is Not Running!" 1>&2
exit 1
fi
exit 0
### スクリプト ここまで ########################################
$ chmod 755 /usr/local/snmp/check_slave_running.sh
$ sh /usr/local/snmp/check_slave_running.sh
起動確認
shell
$ systemctl start snmpd.service
$ snmpwalk -v 2c -c private 127.0.0.1
apacheをインストール
shell
$ yum install -y httpd httpd-devel
デーモン登録
shell
$ systemctl enable httpd.service
$ systemctl list-unit-files httpd.service
nagiosのインストール
shell
$ yum install -y nagios nagios-plugins-all
デーモン登録
shell
$ systemctl enable nagios.service
$ systemctl list-unit-files nagios.service
コンフィグ設定
contacts.cfg
nagiosadminのメールアドレスを設定
define contact{
contact_name nagiosadmin ; Short name of user
use generic-contact ; Inherit default values from generic-contact template (defined above)
alias Nagios Admin ; Full name of user
email xxx@xxx.xxx ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
}
commands.cfg
ファイルの最後尾に以下の監視用コマンドを追加
### custom commands
define command{
command_name check_snmp_disk
command_line $USER1$/check_snmp -H $ARG1$ -P 2c -C private -o dskPercent.$ARG2$ -w 75 -c 90 -l 'Disk Usage %(SNMP)'
}
define command{
command_name check_snmp_la
command_line $USER1$/check_snmp -H $ARG1$ -P 2c -C private -o laLoadInt.1 -w $ARG2$ -c $ARG3$ -l 'Load Average x100(SNMP)'
}
define command{
command_name check_mysql
command_line $USER1$/check_mysql -u $ARG1$ -p $ARG2$ -H $ARG3$ -P 3306
}
define command{
command_name check_snmp_mysqlrep command_line $USER1$/check_snmp -H $ARG1$ -P 2c -C private -o extOutput.$ARG2$ -s "Slave is Running!" -l 'MySQL Slave check(SNMP CUSTOM)'
}
nagios.cfg
L/AやDISKなど監視項目別にファイルを分けると管理しやすいので以下のように変更
#cfg_file=/etc/nagios/objects/localhost.cfg
cfg_file=/etc/nagios/objects/host.cfg
cfg_file=/etc/nagios/objects/la.cfg
cfg_file=/etc/nagios/objects/http.cfg
cfg_file=/etc/nagios/objects/disk.cfg
cfg_file=/etc/nagios/objects/mysql.cfg
host.cfg
define hostgroup {
hostgroup_name localhost
alias hostgroup_localhost
}
define servicegroup {
servicegroup_name localhost
alias servicegroup_localhost
}
define host {
use linux-server ; Inherit default values from a template
host_name localhost ; The name we're giving to this host
alias localhost ; A longer name associated with the host
address 127.0.0.1 ; IP address of the host
hostgroups localhostgroup ; Host groups this host is associated with
}
la.cfg
define service {
use generic-service ; Name of service template to use
name snmp-la-service ; The 'name' of this service template
service_description LA
register 0
}
define service {
use snmp-la-service
host_name localhost
service_description LA
check_command check_snmp_la!127.0.0.1!100!200
servicegroups localhost
}
http.cfg
define service {
use generic-service ; Name of service template to use
name http-service ; The 'name' of this service template
service_description HTTP
register 0
}
define service {
use http-service
host_name localhost
check_command check_http!/!1!10
servicegroups localhost
}
disk.cfg
define service {
use generic-service ; Name of service template to use
name snmp-disk-service ; The 'name' of this service template
service_description DISK
register 0
}
define service {
use snmp-disk-service
host_name localhost
service_description DISK1
check_command check_snmp_disk!127.0.0.1!1
servicegroups localhost
}
mysql.cfg
define service {
use generic-service ; Name of service template to use
name mysql-service ; The 'name' of this service template
service_description MYSQL
register 0
}
define service {
use mysql-service
host_name localhost
check_command check_mysql!vagrant!vagrant!127.0.0.1
servicegroups localhost
}
define service {
use mysql-service
host_name localhost
check_command check_snmp_mysqlrep!127.0.0.1!1
service_description MYSQL_SLAVE_REP
servicegroups localhost
}
起動確認
shell
$ systemctl start nagios.service
NAIOGSの管理画面で状態が確認できれば無事完了です♪
http://${HOST_ADDRESS}/nagios/