[SOLVED] zfs/zed.d not sending email

[Giganic]

I have decided to automate the scrubbing of my pool with the advice provided by @tom from this post ZFS Health and because it is no good scrubbing if you aren't notified of a problem looked in the suggestion at the end of that post about using /etc/zfs/zed.d/zed.rc.

Information about this ZFS Event Daemon is very scarce on the internet and not a lot of mentioned about it's configuration but the config file does a pretty good job and letting you know what you need to setup for things to work. As I want to ensure everything works correctly I ran a scrub on my pool and after completion no email was sent.

Looking at "systemctl status zfs-zed.service" you can see why.

zfs-zed.service - ZFS Event Daemon (zed)
   Loaded: loaded (/lib/systemd/system/zfs-zed.service; disabled)
   Active: active (running) since Fri 2016-08-26 01:21:06 AEST; 1min 26s ago
     Docs: man:zed(8)
Main PID: 10173 (zed)
   CGroup: /system.slice/zfs-zed.service
           └─10173 /sbin/zed -F

Aug 26 01:21:06 test zed[10173]: ZFS Event Daemon 0.6.5-pve9~jessie (PID 10173)
Aug 26 01:21:06 test zed[10173]: Processing events since eid=26
Aug 26 01:21:20 test zed[10194]: eid=27 class=scrub.start pool=tank
Aug 26 01:22:21 test zed[10270]: eid=28 class=scrub.finish pool=tank
Aug 26 01:22:21 test postfix[10282]: fatal: usage: postfix [-c config_dir] [-Dv] command
Aug 26 01:22:22 test zed[10286]: error: scrub.finish-notify.sh: eid=28: postfix exit=1
root@test:/etc/zfs/zed.d#

It seems the command that zed sends to postfix is invalid, perhaps @tom you can let me know how you were able to successfully able to get this to work? Thanks in advance.

zed.rc configuration

##
# zed.rc
#
# This file should be owned by root and permissioned 0600.
##

##
# Absolute path to the debug output file.
#
ZED_DEBUG_LOG="/tmp/zed.log"

##
# Email address of the zpool administrator for receipt of notifications;
#   multiple addresses can be specified if they are delimited by whitespace.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
# Disabled by default; uncomment to enable.
#
ZED_EMAIL_ADDR="email@gmail.com"

##
# Name or path of executable responsible for sending notifications via email;
#   the mail program must be capable of reading a message body from stdin.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
#
ZED_EMAIL_PROG="postmail"

##
# Command-line options for ZED_EMAIL_PROG.
# The string @ADDRESS@ will be replaced with the recipient email address(es).
# The string @SUBJECT@ will be replaced with the notification subject;
#   this should be protected with quotes to prevent word-splitting.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
#
#ZED_EMAIL_OPTS="-s '@SUBJECT@' @ADDRESS@"

##
# Default directory for zed lock files.
#
#ZED_LOCKDIR="/var/lock"

##
# Minimum number of seconds between notifications for a similar event.
#
#ZED_NOTIFY_INTERVAL_SECS=3600

##
# Notification verbosity.
#   If set to 0, suppress notification if the pool is healthy.
#   If set to 1, send notification regardless of pool health.
#
ZED_NOTIFY_VERBOSE=1

##
# Pushbullet access token.
# This grants full access to your account -- protect it accordingly!
#   <https://www.pushbullet.com/get-started>
#   <https://www.pushbullet.com/account>
# Disabled by default; uncomment to enable.
#
#ZED_PUSHBULLET_ACCESS_TOKEN=""

##
# Pushbullet channel tag for push notification feeds that can be subscribed to.
#   <https://www.pushbullet.com/my-channel>
# If not defined, push notifications will instead be sent to all devices
#   associated with the account specified by the access token.
# Disabled by default; uncomment to enable.
#
#ZED_PUSHBULLET_CHANNEL_TAG=""

##
# Default directory for zed state files.
#
#ZED_RUNDIR="/var/run"

##
# Replace a device with a hot spare after N checksum errors are detected.
# Disabled by default; uncomment to enable.
#
#ZED_SPARE_ON_CHECKSUM_ERRORS=10

##
# Replace a device with a hot spare after N I/O errors are detected.
# Disabled by default; uncomment to enable.
#
#ZED_SPARE_ON_IO_ERRORS=1

##
# The syslog priority (e.g., specified as a "facility.level" pair).
#
#ZED_SYSLOG_PRIORITY="daemon.notice"

##
# The syslog tag for marking zed events.
#
#ZED_SYSLOG_TAG="zed"

 

[Giganic]

UPDATE: Fixed.

If you find yourself in a similar situation uncomment ZED_EMAIL_PROG and leave it as mail and lastly uncomment ZED_EMAIL_OPTS.

After performing those two tweaks I am now able to receive an email notification every time zfs scrubs. If you only wish to be notified on errors set ZED_NOTIFY_VERBOSE to 0.

Hopefully this helps someone.