Featured Insight Guide SSH Login Email Alerts Centmin Mod Style

If you want to setup SSH login email alerts whenever you log into your Centmin Mod server. You can backup your /root/.bashrc file and then edit it using nano linux text editor as root user and add these 4 lines to very bottom of /root/.bashrc file. Make sure to change the value of your@emailaddr.com to your email address where you want to send the alerts to.

Code (Text):

SSH_ALERTEMAIL='your@emailaddr.com'
MYTIMES=$(mytimes)
SSH_ALERTIP=$(echo $SSH_CLIENT | awk '{print $1}')
SSH_ALERTGEO=$(curl -4sL https://ipinfo.io/$SSH_ALERTIP/geo | sed -e 's|[{}]||' -e 's/\(^"\|"\)//g' -e 's|,||' -e 's| readme: https://ipinfo.io/missingauth||')
echo -e "ALERT: $(whoami) Shell Access $(hostname): $(date)\n$SSH_ALERTGEO\n$MYTIMES" | mail -s "Alert: $(whoami) Shell Access $(hostname) from $SSH_ALERTIP" $SSH_ALERTEMAIL

sample output for email subject title

Code (Text):

Alert: root Shell Access host.domain.com from 111.222.222.222

sample output for email contents

Code (Text):

ALERT: root Shell Access host.domain.com: Tue Apr  6 18:09:54 UTC 2021

  ip: 111.222.222.222
  city: Sydney
  region: New South Wales
  country: AU
  loc: -33.9032150.9677,
  postal: 2012

Tue Apr  6 18:08:11 UTC 2021    [UTC]
Wed Apr  7 04:08:11 AEST 2021   [Australia/Brisbane]
Tue Apr  6 11:08:11 PDT 2021    [America/Los_Angeles]
Tue Apr  6 13:08:11 CDT 2021    [America/Chicago]
Tue Apr  6 14:08:11 EDT 2021    [America/New_York]
Tue Apr  6 14:08:11 EDT 2021    [America/Montreal]
Tue Apr  6 19:08:11 BST 2021    [Europe/London]
Tue Apr  6 20:08:11 CEST 2021   [Europe/Berlin]
Wed Apr  7 01:08:11 +07 2021    [Asia/Bangkok]
Wed Apr  7 01:08:11 +07 2021    [Asia/Ho_Chi_Minh]
Wed Apr  7 01:08:11 WIB 2021    [Asia/Jakarta]
Wed Apr  7 02:08:11 +08 2021    [Asia/Kuala_Lumpur]
Wed Apr  7 02:08:11 +08 2021    [Asia/Singapore]

---

Notes:

• If you are new to using nano linux text editor, you can read up more about nano here and here. For vim text editor read here and here.
• You may need to whitelist the server from email address in your email inbox i.e. Gmail/Google app setup a filter for the server from email and set it to never mark as spam and add a custom label for alerts.

 

yeah hence Centmin Mod Styled = better that usual defaults

edit: made a slight change to the email subject info to include hostname

 

yeah geo data is only as accurate as the geo ip location database used so not always will show data

you can type your ISP ip address into https://www.iplocation.net/ and see what different geo ip databases report

 

yeah most folks won't realise how much optimisation and tweaks Centmin Mod does behind the scenes compared to non Centmin Mod setups. If a person had to manually replicate what Centmin Mod automates, you'd probably spend a good part of 4-12hrs straight even if you knew what you were doing system admin wise

 

why though, this way it's easier to expand and modify as needed

 

nice.. you can do pushover notifications with above too just set the pushover email addy

not sure, i don't think you can. I usually just stop pure-ftpd service and only start it via SSH when I need to use it

 

did you disable IPv6 ? got working IPv6 ?

 

You enabled?

Code (Text):

DISABLE_IPVSIX='y'

 

@RoldanLT if you edit /etc/hosts

find

Code (Text):

::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

comment it out with hash in front

Code (Text):

#::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

and set inet_interfaces = localhost again and restart postfix, does it work ?

or more proper way try setting postfix variable

Code (Text):

inet_protocols = all

to

Code (Text):

inet_protocols = ipv4

restart postfix