Linux Learning Note: Nagios configuration

Installation method Please refer to Linux learning Note: Nagios installation

Client

Since my installation is using xinetd This daemon, I need to adjust the relevant configuration file

[[email protected] ~]# vi /etc/xinetd.d/nrpe service nrpe{         flags           =  Ipv4        socket_type     = stream         port             = 5666        wait             = no        user             = nagios         group           = nagios         server           = /usr/local/nagios/bin/nrpe        server_args     = -c / usr/local/nagios/etc/nrpe.cfg --inetd        log_on_failure   += USERID        disable          = no        only_from        = 127.0.0.1 192.168.5.33} #注意我的flags改为了IPv4, the end of Only_from added the Nagios server-side IP address

After the client's Nrpe has been installed, several commands are available by default

edit [[email protected] nagios]# vi/usr/local/nagios/etc/nrpe.cfg

At the end of this file, several commands have been pre-configured

Command[check_users]=/usr/local/nagios/libexec/check_users-w 5-c 10

Command[check_load]=/usr/local/nagios/libexec/check_load-w 15,10,5-c 30,25,20

Command[check_hda1]=/usr/local/nagios/libexec/check_disk-w 20%-C 10%-p/dev/hda1

Command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs-w 5-c 10-s Z

Command[check_total_procs]=/usr/local/nagios/libexec/check_procs-w 150-C 200

To monitor the capacity of a hard disk, I added a command

Command[check_disk]=/usr/local/nagios/libexec/check_disk-w 10%-C 5%-p/dev/sdb1

Command[check_disk] is a command alias that will be called by the server side

/usr/local/nagios/libexec/check_disk is a real execution program file, the command alias and execution file name can be different

-W for the Check_disk command, the warning warning value for making free space means that a warning is issued when free space is less than or equal to 10%

-C is used to establish a critical alarm critical value for free space, which means that a critical warning is issued when the free space is less than or equal to 5%.

-P for specifying partitions

Self-test to prove that the Nrpe service on the client is open

[Email protected] ~]#/usr/local/nagios/libexec/check_nrpe-h 127.0.0.1-c check_diskdisk ok-free space:/data 148997 M B (31% inode=99%); |/data=329362mb;453563;478761;0;503959

Nrpe comes with a number of execution programs, which are located in

[[email protected] ~]# ls /usr/local/nagios/libexec/check_apt       check_disk_smb  check_ide_smart     check_mrtg       check_ntp_time  check_rpc      check_upscheck_ Breeze   check_dns       check_ifoperstatus  check _mrtgtraf  check_nwstat    check_sensors  check_uptimecheck_by_ssh    check_dummy     check_ifstatus       check_nagios    check_oracle    check_smtp      check_userscheck_clamd    check_file_age  check_imap           check_nntp      check_overcr     check_ssh &nbsP;    check_wavecheck_cluster  check_flexlm    check_ircd           check_nrpe       check_ping      check_swap     negatecheck_dhcp      check_ftp       check_load           check_nt        check_pop        check_tcp      urlizecheck_dig       check_http      check_log            check_ntp       check_procs      check_time     utils.pmcheck_disk      Check_icmp      check_mailq         check_ntp_peer   check_real      check_udp      utils.sh

Each program has different parameters, which can be viewed through the--help.

Several of them are commonly used

Check_nrpe is used to collect local or remote Nrpe information, similar to server-side programs

CHECK_NT information for collecting Windows servers

CHECK_TCP to test whether the TCP link is healthy

The client simply configures the command in the nrpe.cfg, does not need to reboot, and also remembers to configure the firewall.

Server-side

First, the collection test, the success of the next step, the unsuccessful is to check which step is wrong.

[Email protected] ~]#/usr/local/nagios/libexec/check_nrpe-h 192.168.5.34-c check_diskdisk ok-free space:/data 14899 7 MB (31% inode=99%); |/data=329362mb;453563;478761;0;503959

Add a new profile, note that my file path is servers, because I added this directory in my previous installation to make it easier to organize the configuration files. If the default installation does not make any changes, you should change the servers to objects

vi /usr/local/nagios/etc/servers/smb-backup.cfgdefine host{         use                      linux-server        host_name                Smb-Backup         alias                    Smb-Backup         address                  192.168.5.34        normal_check_interval            1        #1  minute         } define service{        use                               generic-service        host_name                         Smb-Backup        service_description              check disk         check_command                    check_nrpe!check_disk         contact_groups                   admins        normal_check_interval            1        #1  minute         }         #这里上下的host_name必须一致. Check_command behind using Check_nrpe!check_disk, meaning to use the native Check_nrpe program to check the Check_disk command (alias) on the specified host

Note the configuration file must be. cfg end, other suffix nagios is not read

If there is no problem, you can have Nagios check the configuration, the correct words warning and errors are 0, if errors is not 0, you must check where the error occurs, warning can be ignored but not recommended to ignore

[[email protected] ~]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/ nagios.cfgnagios core 4.1.1copyright  (c)  2009-present Nagios Core  development team and community contributorscopyright  (c)  1999-2009 Ethan  galstadlast modified: 08-19-2015license: gplwebsite: https://www.nagios.orgreading  configuration data...   Read main config file okay...    read object config files okay ... Running pre-flight check on configuration data ... checking objects...        checked 7 services.         Checked 7 hosts.         checked 0 host groups.        checked 0  service groups.        checked 1 contacts.         Checked 1 contact groups.         checked 27 commands.        checked 5 time  periods.        Checked 0 host escalations.         checked 0 service escalations. Checking for circular paths...        checked 7  hosts        Checked 0 service dependencies         Checked 0 host dependencies         checked 5 timeperiodschecking global event handlers ... Checking obsessive compulsive procesSor commands ... Checking misc settings ... Total warnings: 0total errors:   0things look okay - no  serious problems were detected during the pre-flight check

Reload the configuration file to take effect

[Email protected] ~]#/etc/init.d/nagios reloadrunning Configuration check ... Reloading Nagios Configuration...done

Before reloading, it will be self-checking, just display the information is relatively simple, inconvenient troubleshooting. If you are willing to study, you can modify the/etc/init.d/nagios footsteps, let them check the output details.

You can then view the Nagios Web page on the server

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Linux Learning Note: Nagios configuration