NetBackup Catalog Backup fails to send the notification e-mail when using "mail_dr_info.sh"

Problem

• After a successful catalog backup, the primary server doesn't send  DR email notification to respective users.
• We are able to send an email manually using mailx utility 
• SMTP server details are correctly mention in file /etc/mail.rc

set smtp=<smtp_server_name>:<port_number>

• This is applicable to BYOS Linux primary server
• This only impacts NetBackup 9.1 and above

Within the NetBackup catalog backup policy, there is a ‘Disaster Recovery’ tab that contains the option ‘Send in an E-mail attachment ( recommended )’.  If this option is checked when the catalog backup completes (successful or failed), on a UNIX/Linux master the file ‘ /usr/openv/netbackup/bin/mail_dr_info.sh ‘ is used to try and deliver the catalog backup results.

Note: By default (except on a Veritas NetBackup appliance), the file ‘ /usr/openv/netbackup/bin/mail_dr_info.sh ‘ does not exist and this must be manually created.  For further details see the “Veritas NetBackup Administrator’s Guide Volume II” (section: NetBackup notify scripts), as this provides details on the script variables which can be used.

/usr/openv/netbackup/bin/mail_dr_info.sh
NetBackup passes the following parameters to the script:

$1 Specifies the recipient's address. For multiple addresses, enter email1,email2
$2 Specifies the subject line.
$3 Specifies the message file name.
$4 Specifies the attached file name.

Error Message

The bpdbm log is showing error 126 while executing mail_dr_info.sh script

The bpdbm log location at master server:

• Unix: /usr/openv/netbackup/logs/bpdbm
• Windows: install_path\NetBackup\logs\bpdbm

07:00:33.785 [11570] <16> send_DR_report: failed to execute "/usr/openv/netbackup/bin/mail_dr_info.sh" "xxxxxxxxxx@xxxxx.xxx.xx" "NetBackup Catalog Backup successful on host xxxxxxxx status 0" "/usr/openv/netbackup/db/mail/xxxxxxxxx_1655067618" "/tmp/xxxxx/xxxxxxx_1655067618_INCR,/tmp/xxxxx/xxxxxxxxx_1655067618_INCR.drpkg" (126)
07:00:33.786 [11570] <4> db_error_add_to_file: Could not send DR report
07:00:33.786 [11570] <16> generate_DR_file_and_send_mail: Could not send DR report
07:00:33.786 [11570] <16> exec_catalog_DR_protection: Failed to send DR image to xxxxxxxxxx@xxxxx.xxx.xx (0)

Cause

The Primary server is running the NetBackup processes with a non-root user (service user feature of NetBackup 9.1 version) and the ownership of the script /usr/openv/netbackup/bin/mail_dr_info.sh with a different user. The user mentioned in SERVICE_USER and ownership of the file "mail_dr_info.sh" should match. It can be verified using parameter SERVICE_USER  in file /usr/openv/netbackup/bp.conf

Note: The ownership of this file does not cause this issue with the pre-9.1 NetBackup version. 

Solution

Modify the user ownership and group ownership of the script "mail_dr_info.sh" to match the SERVICE_USER  that is mentioned in the bp.conf

Here is an example

#cat /usr/openv/netbackup/bp.conf | grep SERVICE_USER

SERVICE_USER = nbu

#chown nbu:nbu /usr/openv/netbackup/bin/mail_dr_info.sh