Installing Nagios
Nagios is a monitoring system that monitors system operation status and network information. Nagios can monitor the specified local or remote hosts and services, and provide exception notification functions
Nagios can run on Linux/Unix platform and provide an optional browser based WEB interface to facilitate system managers to view network status, various system problems, logs and so on.
Open the official document of Nagios and you will find that Nagios basically does not have any dependent packages. It only requires that the system be Linux or other systems supported by Nagios. However, if you do not install apache (http service), you will not have such an intuitive interface to view monitoring information, so apache is a prerequisite for the moment.
Install Apache
sudo yum install httpd sudo service httpd start
./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-perl --with-statefiles-dir=/tmp
Installing Nagios
Install environment package
yum install -y \ -- gcc \ -- glibc \ -- glibc-common \ -- gd \ -- gd-devel \ -- xinetd \ -- openssl-devel
Create administrative user
useradd -s /sbin/nologin nagios
Create the installation directory and specify the primary group
mkdir /usr/local/nagios chown -R nagios.nagios /usr/local/nagios
Compile and install nagios
wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.3.tar.gz tar -zxvf nagios-4.4.3.tar.gz cd nagios-4.4.3 ./configure --prefix=/usr/local/nagios make all make install make install-init make install-commandmode make install-config
Installing Nagios plugins
Nagios plugins download address
wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz tar -zxvf nagios-plugins-2.2.1.tar.gz cd nagios-plugins-2.2.1 ./configure --prefix=/usr/local/nagios make make install
Configuring nagios monitoring system
Monitoring Nagios of the three swordsmen
Configuring nagios to monitor MySQL
Using check_mysql_health
check_mysql_health official introduction Homepage
wget https://labs.consol.de/assets/downloads/nagios/check_mysql_health-2.2.2.tar.gz tar -zxvf check_mysql_health-2.2.2.tar.gz cd check_mysql_health-2.2.2 ./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-perl=/usr/bin/perl --with-statefiles-dir=/usr/local/nagios/var/tmp
Create a user
grant usage on *.* to 'nagios'@'%' identified by 'nagios';
Check check_mysql_health plug-in
./check_mysql_health --hostname 192.168.192.129 --port 3306 -username nagios --password nagios --mode connection-time --warning 0.001 --critical 0.0011 -- without Perl yum install 'perl(Data::Dumper)' -- without DBI.pm yum install perl-DBI perl-DBD-MySQL -y
Add configuration
Server monitoring (custom): VIM / usr / local / Nagios / etc / objects / hosts cfg
define host{
use linux-server ; Reference host linux-server Attribute information of, linux-server Host in templates.cfg Defined in the file.
host_name monitor_mysql_60 ; Host name, custom
alias mon_60 ; host alias
address 192.168.20.60 ; The monitored host address, which can be ip，It can also be a domain name.
}
define hostgroup{ ; Define a host group
hostgroup_name monitor-servers ; Host group name, which can be specified at will.
alias monitorServers ; Host group alias
members monitor_mysql_60 ; Host group member, where"monitor_60"Is the host defined above.
}
Server monitoring (custom): VIM / usr / local / Nagios / etc / objects / services cfg
define service{
use local-service ; quote local-service Property value of the service, local-service stay templates.cfg Defined in the file.
host_name monitor_mysql_60 ; Specify which host to monitor for services, monitor_mysql_60 stay hosts.cfg Defined in the file.
service_description check-host-alive ; Description of monitoring service content for reference of maintenance personnel.
check_command check-host-alive ; Specifies the command to check.
}
Configure nagios command line file: VIM / usr / local / nagios / etc / objects / commands cfg
# check_mysql_health command definition
define command{
command_name check_mysql_health
command_line $USER1$/check_mysql_health --hostname $ARG1$ --port $ARG2$ --username $ARG3$ --password $ARG4$ --mode $ARG5$ --warning $ARG6$ --critical $ARG7$
}
Configure monitoring service items (customized): VIM / usr / local / Nagios / etc / objects / mysqlservices cfg
define service{
use local-service
host_name monitor_mysql_60
service_description check_mysql_connection_time
check_command check_mysql_health!192.168.20.60!3306!nagios!nagios!connection-time!2!10
}
define service{
use local-service
host_name monitor_mysql_60
service_description check_mysql_uptime
check_command check_mysql_health!192.168.20.60!3306!nagios!nagios!uptime!10080!44640
}
define service{
use local-service
host_name monitor_mysql_60
service_description check_mysql_connections
check_command check_mysql_health!192.168.20.60!3306!nagios!nagios!threads-connected!70!150
}
define service{
use local-service
host_name monitor_mysql_60
service_description check_mysql_table_lock
check_command check_mysql_health!192.168.20.60!3306!nagios!nagios!table-lock-contention!1!2
}
define service{
use local-service
host_name monitor_mysql_60
service_description check_mysql_slow_queries
check_command check_mysql_health!192.168.20.60!3306!nagios!nagios!slow-queries!1!2
}
Add custom mysqlservices CFG to the configuration file: / usr / local / Nagios / etc / Nagios cfg
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg cfg_file=/usr/local/nagios/etc/objects/services.cfg cfg_file=/usr/local/nagios/etc/objects/mysqlservices.cfg
Verification configuration
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Restart service
systemctl restart httpd.service systemctl restart nagios.service
Other commands - see official documents for details
-- Time to connect to the server sudo ./check_mysql_health --hostname 192.168.20.60 --username nagios --password nagios --mode connection-time sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode connection-time --warning 0.001 --critical 0.0011 -- Server running time sudo ./check_mysql_health --hostname 192.168.20.60 --username nagios --password nagios --mode uptime-time -- Number of currently open connections sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode threads-connected -- Hit rate of thread cache sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode threadcache-hitrate -- Number of threads created per second sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode threads-created -- Number of threads currently running sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode threads-running -- Number of threads currently cached sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode threads-cached -- Connection termination: the number of aborted connections per second sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode connects-aborted -- Client termination sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode clients-aborted -- Query cache hit rate sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode querycache-hitrate -- Query cache entries trimmed due to insufficient memory sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode qcache-lowmem-prunes -- MyISAM key cache hit rate sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode keycache-hitrate -- InnoDB Buffer pool hit rate sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode bufferpool-hitrate -- InnoDB Buffer pool waiting for available sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode bufferpool-wait-free -- Because the log buffer is too small, InnoDB Log waiting sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode log-waits -- Table cache hit rate sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode tablecache-hitrate -- Table lock contention sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode table-lock-contention -- Percentage of temporary tables created on disk sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode tmp-disk-tables -- Long running process sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode long-running-procs -- Indexes sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode index-usage -- Displays the table that should be optimized sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode table-fragmentation -- Percentage of open files sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode open-files -- Slow query sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode slow-queries -- Any that returns a single number sql command sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode sql --name 'select 111 from dual' sudo ./check_mysql_health --hostname 192.168.20.60 --port 3306 --username nagios --password nagios --mode sql --name 'select 111 from dual' --name2 myval --units GB