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es:howtos:software:nagios [2019/02/28 01:49 (UTC)] (actual) slackwarespanol creado |
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+ | ====== Nagios ====== | ||
+ | ====== Installation ====== | ||
+ | |||
+ | - Create the nagios group and user: <code> | ||
+ | groupadd -g 213 nagios | ||
+ | useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios | ||
+ | </code> | ||
+ | - Add the 'apache' user to the 'nagios' group, so that it can write to the ''/var/nagios/rw'' directory ('a' option prevents the user to be removed from other groups, the member of which he is already): <code> | ||
+ | usermod -aG nagios apache | ||
+ | </code> | ||
+ | - Install the Nagios::Plugin Perl module: <code> | ||
+ | cpan -i Monitoring::Plugin | ||
+ | </code> | ||
+ | - Use [[http://sbopkg.org/|sbopkg]] or install the individual packages using scripts from [[http://slackbuilds.org/|SlackBuilds.org]], and install the following in this order: | ||
+ | * RRDTool | ||
+ | * nagios (currently, the package which can be built using a [[http://slackbuilds.org/network/nagios/ | SlackBuilds.org script]] is nagios-4.0.8) | ||
+ | * nagios-plugin package | ||
+ | * nagios-graphing | ||
+ | - Edit ''/etc/nagios/nagios.conf'' and turn off the logging: <code> | ||
+ | CHANGE: | ||
+ | use_syslog=1 | ||
+ | TO: | ||
+ | use_syslog=0 | ||
+ | CHANGE: | ||
+ | log_notifications=1 | ||
+ | TO: | ||
+ | log_notification=0 | ||
+ | </code> | ||
+ | - Edit ''/etc/httpd/extra/nagios.conf'', after the ''<Directory "/var/www/htdocs/nagios">'' line: <code> | ||
+ | CHANGE: | ||
+ | Options None | ||
+ | TO: | ||
+ | Options FollowSymLinks | ||
+ | </code> | ||
+ | - Edit ''/etc/httpd/http.conf'' <code> | ||
+ | COMMENT: | ||
+ | LoadModule mpm_event_module lib64/httpd/modules/mod_mpm_event.so | ||
+ | UNCOMMENT: | ||
+ | #LoadModule mpm_prefork_module lib64/httpd/modules/mod_mpm_prefork.so | ||
+ | UNCOMMENT: | ||
+ | #LoadModule cgi_module lib64/httpd/modules/mod_cgi.so | ||
+ | |||
+ | (or #LoadModule cgi_module lib/httpd/modules/mod_cgi.so on 32bit installs) | ||
+ | |||
+ | CHANGE: | ||
+ | <IfModule dir_module> | ||
+ | DirectoryIndex index.html | ||
+ | </IfModule> | ||
+ | TO: | ||
+ | <IfModule dir_module> | ||
+ | DirectoryIndex index.html index.php | ||
+ | </IfModule> | ||
+ | CHANGE: | ||
+ | # Uncomment the following line to enable PHP: | ||
+ | # | ||
+ | # Include /etc/httpd/mod_php.conf | ||
+ | TO: | ||
+ | # Uncomment the following line to enable PHP: | ||
+ | # | ||
+ | Include /etc/httpd/mod_php.conf | ||
+ | |||
+ | RIGHT AFTER: | ||
+ | DocumentRoot /srv/httpd/htdocs | ||
+ | ADD: | ||
+ | Include /etc/httpd/extra/nagios.conf | ||
+ | </code> | ||
+ | - Make sure apache starts at boot and start/restart apache: <code> | ||
+ | chmod 755 /etc/rc.d/rc.httpd | ||
+ | /etc/rc.d/rc.httpd restart | ||
+ | </code> | ||
+ | - Set the password for //nagiosadmin// : <code> | ||
+ | htpasswd -c /etc/nagios/htpasswd.users nagiosadmin | ||
+ | </code> | ||
+ | - (Not sure if this is necessary but, leaving it in until I can test) \\ Make sure nagios starts at boot and start/restart nagios: | ||
+ | - Edit ''/etc/rc.d/rc.local'' and add: <code> | ||
+ | # Start nagios: | ||
+ | if [ -x /etc/rc.d/rc.nagios ]; then | ||
+ | echo "Starting nagios..." | ||
+ | /etc/rc.d/rc.nagios start | ||
+ | fi | ||
+ | </code> | ||
+ | - Edit ''/etc/rc.d/rc.local_shutdown'' (you may have to create this file if it does not exist, and make it executable) and add: <code> | ||
+ | # Stop nagios: | ||
+ | if [ -x /etc/rc.d/rc.nagios ]; then | ||
+ | echo "Stopping nagios..." | ||
+ | /etc/rc.d/rc.nagios stop | ||
+ | fi | ||
+ | </code> | ||
+ | - Make rc.nagios executable: <code> | ||
+ | # chmod 755 /etc/rc.d/rc.nagios | ||
+ | </code> | ||
+ | - Start nagios: <code> | ||
+ | # /etc/rc.d/rc.nagios restart | ||
+ | </code> | ||
+ | |||
+ | ====== Check That Nagios Is Running ====== | ||
+ | |||
+ | Goto **http://YOUR_MACHINE/nagios/** and you should see Nagios working. | ||
+ | |||
+ | ====== Add Users ====== | ||
+ | |||
+ | - Run the ''htpasswd'' command for each user: <code> | ||
+ | htpasswd -c /etc/nagios/htpasswd.users bob | ||
+ | htpasswd -c /etc/nagios/htpasswd.users sue | ||
+ | </code> | ||
+ | - Edit ''/etc/nagios/cgi.cfg'' and add the user(s) too: <code> | ||
+ | authorized_for_all_services=nagiosadmin,bob,sue | ||
+ | authorized_for_all_hosts=nagiosadmin,bob,sue | ||
+ | </code> (or add "''*''" to allow all authenticated users) | ||
+ | |||
+ | |||
+ | ====== TROUBLESHOOTING ====== | ||
+ | ERROR: When browsing to the nagios webpage (as nagiosadmin) you get "You do not have permission" | ||
+ | |||
+ | HINT: Check /var/log/httpd/error_log to see what is failing. | ||
+ | |||
+ | FIX1: Make sure that /srv/www/htdocs/nagios is "drwxrwxr-x nagios nagios" | ||
+ | |||
+ | FIX2: In /etc/http/httpd.conf make sure: | ||
+ | UNCOMMENT: Include /etc/httpd/mod_php.conf | ||
+ | Do the "<IfModule dir_module>" change listed above. | ||
+ | | ||
+ | ----- | ||
+ | |||
+ | ERROR: When clicking on Nagios cgi pages, they are downloaded and not executed. | ||
+ | |||
+ | FIX: Make sure the "LoadModule cgi_module" is uncommented as described above. | ||
+ | |||
+ | ----- | ||
+ | |||
+ | ERROR: "stderr: execvp(/usr/libexec/monitoring-plugins/check_ping, ...) failed. errno is 2: No such file or directory" | ||
+ | |||
+ | FIX: vi /etc/nagios/resource.cfg | ||
+ | CHANGE: $USER1$=/usr/libexec/monitoring-plugins | ||
+ | TO: $USER1$=/usr/libexec/nagios | ||
+ | |||
+ | ----- | ||
+ | |||
+ | ERROR: I've done the FIXes above and it's still not working... | ||
+ | |||
+ | FIX: Didya restart httpd and/or nagios? | ||
+ | /etc/rc.d/rc.httpd restart | ||
+ | /etc/rc.d/rc.nagios restart | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ====== Install NRPE On A Target Machine ====== | ||
+ | |||
+ | **ON THE TARGET MACHINE (as root):** | ||
+ | |||
+ | groupadd -g 213 nagios | ||
+ | useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios | ||
+ | |||
+ | Install nagios via SBo (Required by Nagios-plugins) | ||
+ | |||
+ | Install nagios-plugins via SBo (Required by NRPE) | ||
+ | |||
+ | Install nrpe via SBo | ||
+ | |||
+ | Ignore the xinetd stuff, you have to run NRPE as a daemon on Slackware (unless you want to go through the headache of replacing inetd with xinetd) | ||
+ | |||
+ | So, start NRPE in Daemon mode: | ||
+ | chmod 755 /etc/rc.d/rc.nrpe | ||
+ | /etc/rc.d/rc.nrpe start | ||
+ | |||
+ | Test NRPE | ||
+ | /usr/libexec/nagios/check_nrpe -H localhost | ||
+ | NRPE v2.15 | ||
+ | | ||
+ | /usr/libexec/nagios/check_nrpe -H localhost -c check_users | ||
+ | USERS OK - 1 users currently logged in |users=1;5;10;0 | ||
+ | |||
+ | Add your Nagios server's IP into the allowed_hosts list: | ||
+ | vi /etc/nagios/nrpe.cfg | ||
+ | allowed_hosts=127.0.0.1,192.168.1.77 (WHERE: 192.168.1.77 is the IP of your Nagios server) | ||
+ | |||
+ | chown nagios:nagios /etc/nagios/nrpe.cfg | ||
+ | |||
+ | ----- | ||
+ | **ON THE NAGIOS SERVER MACHINE:** | ||
+ | |||
+ | Add the client machine into one of the .cfg files | ||
+ | |||
+ | I did this: | ||
+ | vi /etc/nagios/nagios.cfg | ||
+ | ADD: | ||
+ | # Definitions for monitoring a linux machine | ||
+ | cfg_file=/etc/nagios/objects/linux.cfg | ||
+ | |||
+ | chown nagios:nagios /etc/nagios/nagios.cfg | ||
+ | |||
+ | vi /etc/nagios/objects/linux.cfg_file | ||
+ | ######################################################### | ||
+ | # Linux configuration file | ||
+ | ######################################################### | ||
+ | | ||
+ | define host { | ||
+ | use linux-server | ||
+ | host_name MyLinuxBox | ||
+ | alias LinuxBox1 | ||
+ | address 192.168.1.110 | ||
+ | register 1 | ||
+ | } | ||
+ | define service{ | ||
+ | host_name MyLinuxBox | ||
+ | service_description PING | ||
+ | check_command check_ping!100.0,20%!500.0,60% | ||
+ | max_check_attempts 2 | ||
+ | check_interval 2 | ||
+ | retry_interval 2 | ||
+ | check_period 24x7 | ||
+ | check_freshness 1 | ||
+ | contact_groups admins | ||
+ | notification_interval 2 | ||
+ | notification_period 24x7 | ||
+ | notifications_enabled 1 | ||
+ | register 1 | ||
+ | } | ||
+ | | ||
+ | ######################################################### | ||
+ | # END OF FILE | ||
+ | ######################################################### | ||
+ | |||
+ | chown nagios:nagios /etc/nagios/objects/linux.cfg_file | ||
+ | |||
+ | Restart Nagios | ||
+ | /etc/rc.d/rc.nagios restart | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ====== Sources ====== | ||
+ | |||
+ | <!-- If you are copying information from another source, then specify that source --> | ||
+ | <!-- * Original source: [[http://some.website.org/some/page.html]] --> | ||
+ | <!-- Authors are allowed to give credit to themselves! --> | ||
+ | * Originally written by [[wiki:user:arfon | arfon]] | ||
+ | <!-- * Contributions by [[wiki:user:yyy | User Y]] --> | ||
+ | |||
+ | <!-- Please do not modify anything below, except adding new tags.--> | ||
+ | <!-- You must remove the tag-word "template" below before saving your new page --> | ||
+ | {{tag>howtos software nagios network_monitoring author_arfon}} |