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Version: ⭐ 23.10

Configuring your Centreon to send emails

For your Centreon to be able to send notification emails, you need to configure a local SMTP server. If your operating system is RHEL or Oracle Linux, Postfix is already installed.

This page gives you an example of a possible configuration. Refer to the official Postfix documentation for more information.

Notification commands are executed by the poller that monitors the resource, so you need to configure the mail relay on all pollers.

We recommend that you use a dedicated email account to send notifications.

Step 1: Configuring Postfix​

  1. In your server's terminal, enter the following command:
dnf install mailx cyrus-sasl-plain

  1. Restart Postfix:

    systemctl restart postfix

  2. Configure Postfix to run at startup:

    systemctl enable postfix

  3. Edit the following file:

    vi /etc/postfix/main.cf

  4. Add the following information:

    myhostname = hostname
    relayhost = [smtp.isp.com]:port
    smtp_use_tls = yes
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
    smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
    smtp_sasl_security_options = noanonymous
    smtp_sasl_tls_security_options = noanonymous
    • myhostname is the hostname of the Centreon server.
    • relayhost is the email server for the account that will send notifications.

    In the following example, Centreon will use a Gmail account to send notifications:

    myhostname = centreon-central
    relayhost = [smtp.gmail.com]:587
    smtp_use_tls = yes
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
    smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
    smtp_sasl_security_options = noanonymous
    smtp_sasl_tls_security_options = noanonymous

Step 2: Configuring the credentials of the account that will send emails​

  1. Create a /etc/postfix/sasl_passwd file:

    touch /etc/postfix/sasl_passwd

  2. Add the following line (replace username:password with the credentials of the account that will send the notification emails):

    [smtp.isp.com]:port username:password

    Example:

    [smtp.gmail.com]:587 username@gmail.com:XXXXXXXX

  3. Save the file.

  4. In the terminal, enter the following command: 

    postmap /etc/postfix/sasl_passwd

  5. For security reasons, change the permissions on the file:

    chown root:postfix /etc/postfix/sasl_passwd*
    chmod 640 /etc/postfix/sasl_passwd*

  6. Reload Postfix so that changes are taken into account:

    systemctl reload postfix

Testing and troubleshooting email configuration​

  • To send a test email, enter the following command:

    echo "Test" | mail -s "Test" user@isp.com

    Replace user@isp.com with a real email address. The recipient should receive the test email.

  • If the user has not received the message, check the following log file:

    tail -f /var/log/maillog

  • To check that your Postfix service is running, enter:

    systemctl status postfix

    The results should look like this:

    image

Gmail configuration​

If you want to send emails through a Gmail account, you will need to turn on the Allow less secure apps option on this account. See Less secure apps & your Google Account.