{"id":7562,"date":"2023-12-16T01:35:13","date_gmt":"2023-12-15T20:05:13","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=7562"},"modified":"2023-12-16T01:36:34","modified_gmt":"2023-12-15T20:06:34","slug":"how-to-enable-email-notifications-for-the-nagios-alerts","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/how-to-enable-email-notifications-for-the-nagios-alerts\/","title":{"rendered":"How to enable email notifications for the Nagios alerts"},"content":{"rendered":"\n

Introduction<\/strong><\/p>\n\n\n\n

Nagios is an open-source IT system monitoring tool. It sends alerts when critical infrastructure components fail and recover, providing administrators with notice of important events<\/p>\n\n\n\n

Prerequisites<\/strong><\/p>\n\n\n\n

    \n
  1. SSH (sudo ) access to the Nagios host server<\/li>\n\n\n\n
  2. The Nagios host should have an SMTP service (postfix – default) in the active state<\/li>\n<\/ol>\n\n\n\n

    Implementation<\/strong><\/p>\n\n\n\n

    (1) Define email notification commands
    <\/strong>
    $ vi \/usr\/local\/nagios\/etc\/objects\/commands.cfg<\/p>\n\n\n\n

    ========<\/p>\n\n\n\n

    Add \/edit the below lines<\/p>\n\n\n\n

    # ‘notify-host-by-email’ command definition<\/p>\n\n\n\n

    define command {<\/p>\n\n\n\n

    command_name    notify-host-by-email command_line    \/usr\/bin\/printf “%b” “***** Nagios *****\\n\\nNotification Type: $NOTIFICATIONTYPE$\\nHost: $HOSTNAME$\\nState: $HOSTSTATE$\\nAddress: $HOSTADDRESS$\\nInfo: $HOSTOUTPUT$\\n\\nDate\/Time: $LONGDATETIME$\\n” | mail -s “** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **” $CONTACTEMAIL$}<\/p>\n\n\n\n

    # ‘notify-service-by-email’ command definition<\/p>\n\n\n\n

    define command {<\/p>\n\n\n\n

        command_name    notify-service-by-email    command_line    \/usr\/bin\/printf “%b” “***** Nagios *****\\n\\nNotification Type: $NOTIFICATIONTYPE$\\n\\nService: $SERVICEDESC$\\nHost: $HOSTALIAS$\\nAddress: $HOSTADDRESS$\\nState: $SERVICESTATE$\\n\\nDate\/Time: $LONGDATETIME$\\n\\nAdditional Info:\\n\\n$SERVICEOUTPUT$\\n” | mail -s “** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$\/$SERVICEDESC$ is $SERVICESTATE$ **” $CONTACTEMAIL$}<\/p>\n\n\n\n

    =========<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    (2) Define email contacts and groups<\/strong><\/p>\n\n\n\n

    $ vi \/usr\/local\/nagios\/etc\/objects\/contacts.cfg<\/p>\n\n\n\n

    Add\/edit the below lines<\/p>\n\n\n\n

    define contact {<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0contact_name\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0nagiosadmin\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 generic-contact\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0alias \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Nagios Admin\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0email \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 user@email.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******<\/p>\n\n\n\n

    }<\/p>\n\n\n\n

    ############### NEW CONTACT ###################<\/p>\n\n\n\n

    define contact<\/p>\n\n\n\n

    {        <\/p>\n\n\n\n

    contact_name\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 contact-name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 generic-contact\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    alias \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Contact Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    email \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 username1@email.com\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    service_notification_commands \u00a0 notify-service-by-email\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    host_notification_commands\u00a0 \u00a0 \u00a0 notify-host-by-email\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    service_notification_period \u00a0 \u00a0 24\u00d77\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    host_notification_period\u00a0 \u00a0 \u00a0 \u00a0 24\u00d77\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    service_notification_options\u00a0 \u00a0 w,u,c,r,f\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n\n\n\n

    host_notification_options \u00a0 \u00a0 \u00a0 d,u,r,f<\/p>\n\n\n\n

    }<\/p>\n\n\n\n

    ############### ###################<\/p>\n\n\n\n

    Modify the \u201ccontact_name\u201d and \u201cemail\u201d addresses as per the requirement\u00a0<\/p>\n\n\n\n

    <\/p>\n\n\n\n

    w = notify on warning states<\/p>\n\n\n\n

    c = critical states<\/p>\n\n\n\n

    r = recovery<\/p>\n\n\n\n

    f = start\/stop of flapping<\/p>\n\n\n\n

    d = notify on down states<\/p>\n\n\n\n

    u = notify on unreachable states<\/p>\n\n\n\n

    s = notify on stopped states<\/p>\n\n\n\n

    (3) Define the email group to which the mail needs to be sent<\/strong><\/p>\n\n\n\n

    $ vi \/usr\/local\/nagios\/etc\/objects\/contacts.cfg<\/p>\n\n\n\n

    Add\/edit the below lines<\/p>\n\n\n\n

    ############# NEW CONTACT GROUPS ##############<\/p>\n\n\n\n

    define contactgroup{<\/p>\n\n\n\n

            contactgroup_name       admins<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0alias \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Nagios Administrators<\/p>\n\n\n\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0members \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 contact-name,mailadmin,nagiosadmin<\/p>\n\n\n\n

    }<\/p>\n\n\n\n

    ###############################################<\/p>\n\n\n\n

    (4) Define contact details in the host and service configuration<\/strong><\/p>\n\n\n\n

    $ vi \/usr\/local\/nagios\/etc\/hosts\/cl2.cfg<\/p>\n\n\n\n

    # Host configuration Section
    define host
    {
    use linux-server
    host_name hostname
    alias alias-name
    Server address IP
    register 1
    contact_groups admins
    }

    (5) Verify the Nagios configuration and check for error<\/strong><\/p>\n\n\n\n

    \/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/p>\n\n\n\n

    (6) Restart Nagios server <\/strong><\/p>\n\n\n\n

    $ systemctl restart nagios<\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    Introduction Nagios is an open-source IT system monitoring tool. 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