Many of these steps were borrowed from other blogs around the place. I've used this technique many times and it has saved me at least once from a dramatic harddrive failure.
This is what we are going to do:
- Setup Postfix to use gmail as a mail relay
- Setup smartmontools to monitor your disks and do regular self-tests
Using Postfix as a relay with gmail
Get yourself a gmail address dediciated for machine monitoring.
Install postfix, mailutils and the sasl magic:
sudo apt-get install postfix mailutils libsasl2-modules
- Choose 'Internet site'
- Accept the default System mail name (your hostname)
Choose the defaults for the rest of the options – if you’re not running IPv6 then choose IPv4 on the last screen.
Now, postfix is up and running, but we have to reconfigure it.
Log into your gmail account and generate an app password.
Create a password file for it with:
sudo vim /etc/postfix/sasl/sasl_passwd
Put the following line in the file:
[smtp.gmail.com]:587 [email protected]:apppassword
Make sure that root is the only person who can see it:
sudo chmod 600 /etc/postfix/sasl/sasl_passwd
Create the hash db file for Postfix by running the postmap command:
sudo postmap /etc/postfix/sasl/sasl_passwd
Edit your postfix mail configuration file with:
sudo vim /etc/postfix/main.cf
modify the relayhost line to read:
relayhost = [smtp.gmail.com]:587
Then add to the end of the file:
smtp_sasl_auth_enable = yes smtp_sasl_security_options = noanonymous smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd smtp_tls_security_level = encrypt smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
Restart postfix with:
sudo service postfix restart
sudo apt-get install smartmontools
Check your hardrive name (if you are using one drive it should be /dev/sda):
Should get something like:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 465.8G 0 disk ├─sda1 8:1 0 512M 0 part /boot/efi ├─sda2 8:2 0 461.4G 0 part / └─sda3 8:3 0 3.9G 0 part [SWAP]
Then check the status of the SMART compatibility of the drive:
smartctl -i /dev/sda
You should get something like:
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-116-generic] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: WDC WD5000LPLX-00ZNTT0 Serial Number: WD-WXU1AB7JFUDZ LU WWN Device Id: 5 0014ee 608430033 Firmware Version: 01.01A01 User Capacity: 500,107,862,016 bytes [500 GB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 7200 rpm Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Mon Mar 19 13:22:01 2018 AEDT SMART support is: Available - device has SMART capability. SMART support is: Enabled
Note here that SMART support is available and enabled but the device is not in the smartctl database.
To enable SMART on sda1:
sudo smartctl -s on /dev/sda
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-116-generic] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org === START OF ENABLE/DISABLE COMMANDS SECTION === SMART Enabled.
Want to run a test now? Have a look at the options with:
sudo smartctl --help
Next, we want to set this up to run every morning.
Enable it to run as a daemon:
sudo vim /etc/default/smartmontools
Uncomment the line that says ‘start_smartd=yes’
Edit the smartd.conf file:
sudo vim /etc/smartd.conf
Comment out the line that looks like:
DEVICESCAN -d removable -n standby -m root -M exec /usr/share/smartmontools/smartd-runner
Replace it with something like:
DEVICESCAN -H -l error -l selftest -f -s (O/../.././01|L/../.././04|C/../.././06) -m [email protected] -M test -M daily
This will now:
a. Run self tests every morning of every day on your disks
b. Send you an email if there is a problem
c. Send you an email at startup of the smartmontools daemon to test if the email communication is working
d. Mail you daily reminders about a failed disk
Now, start the smartmontools daemon with:
sudo service smartmontools start