I am going to set
up a simple init script that will send a notification to a Slack room when the
machine shutsdown or starts up.
Simple Script
If you don't know
how to set up the webhook integration in Slack check out this video to get you
up to speed.
Also I posted
this tutorial as a youtube video at
Create this
simple script
|
> sudo vi
/etc/init.d/notify_slack
|
And post the
following into it.
|
#!/bin/bash
#
# This script notifies slack when the machine is shutdown
or started
#
##############
slack_url=https://hooks.slack.com/services/REPLACE-WITH-YOUR-URL
case "$1" in
start)
curl -H
"Content-type: application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"text":"Test text Start"
}' $slack_url
;;
stop)
curl -H
"Content-type: application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"text":"Test text Stop"
}' $slack_url
;;
*)
echo "INFO:
Script used to send notifications to Slack Shutdown/Startup" >&2
exit 3
;;
esac
exit 0
|
Change the
slac_url to your actual webhook url in slack.
Also change the
#dev_ops room to the name of the room you want this posted.
Make it
executable
|
> sudo chmod
u+x /etc/init.d/notify_slack
|
Now test it.
|
> sudo
/etc/init.d/notify_slack start
> sudo
/etc/init.d/notify_slack stop
|
It should post this simple message to the slack room.
Register the service
Run the following to register the service so it runs on
startup and shutdown.
|
> sudo
update-rc.d notify_slack defaults
|
Now reboot!
|
> sudo reboot
now
|
You should see the stop and stop messages post as the
computer reboots.
Making it prettier
Update your script to the following to make it a bit
prettier.
|
#!/bin/bash
#
# This script notifies slack when the machine is shutdown
or started
#
##############
slack_url=https://hooks.slack.com/services/REPLACE-WITH-YOUR-URL
case "$1" in
start)
curl -H
"Content-type: application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"username":"ESXi",
"icon_emoji":":esxi:",
"attachments" : [
{
"fallback":"Server Starting up!",
"color":"good",
"fields" : [
{
"title": "Server Starting up",
"value": "Starting up",
"short":
"true"
}
]
}
]
}' $slack_url
;;
stop)
curl -H
"Content-type: application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"username":"ESXi",
"icon_emoji":":esxi:",
"attachments" : [
{
"fallback":"Server Shutting down!",
"color":"good",
"fields" : [
{
"title": "Server Shutting down",
"value": "Starting down",
"short": "true"
}
]
}
]
}' $slack_url
;;
*)
echo "INFO:
Script used to send notifications to Slack Shutdown/Startup" >&2
exit 3
;;
esac
exit 0
|
Run a quick test (without rebooting)
|
> sudo
/etc/init.d/notify_slack start
> sudo
/etc/init.d/notify_slack stop
|
Looks a lot better now.
Note: I uploaded a
custom emoji named :esxi: that is why I get this view when it runs.
Useful information
It may look better but I want some more useful information
to be posted when a machine boots or shuts down. Things like IP address and Disk space left.
Here is what I came up with (You may need to tweak this a
bit)
|
#!/bin/bash
#
#
#
This script notifies slack
#
when this machine starts up
#
or shuts down
#
########################################
#This
reads in the webhook URL from a file
#just
replace it with you actual webhook URL
slack_url=`cat
/etc/init.d/slack_url`
start_text="Name :
`hostname`"
start_text+="\nIP : `ip route get 8.8.8.8 | awk '{print $NF;
exit}'`"
stop_text+=$start_text
start_text+="\nMemory :
`cat /proc/meminfo | grep MemTotal | awk '{mem= $2/1048576;
printf("%0.2g GiB",
mem)
; exit}'`"
drive_info="\n Drives :"
drive_info="`df
-h | grep Filesystem`"
drive_info+="\n`df
-h | grep /dev/sd
| sed ':a;N;$!ba;s/\n/\\\n/g'`"
case
"$1" in
start)
curl -H
"Content-type:application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"username" :
"ESXi",
"icon_emoji" :
":esxi:",
"attachments" : [
{
"fallback": "Server
Starting up!",
"color" :
"good",
"fields" : [
{
"title" :
"Server Starting Up!",
"value" :
"'"$start_text"'",
"short" :
"true"
},
{
"title" :
"Drive Status",
"value" :
"'"$drive_info"'",
"short" :
"true"
}
]
}
]
}
' $slack_url
;;
stop)
curl -H
"Content-type:application/json" \
-X POST -d \
'{
"channel":"#dev_ops",
"username" :
"ESXi",
"icon_emoji" :
":esxi:",
"attachments" : [
{
"fallback": "Server
Shutting Down!",
"color" :
"good",
"fields" : [
{
"title" :
"Server Shutting Down!",
"value" :
"'"$stop_text"'",
"short" :
"true"
}
]
}
]
}
' $slack_url
;;
*)
echo "INFO:Script used to send
notifications to Slack Shutdown/Startup" >&2
exit 3
;;
esac
exit
0
|
And here is the results of a reboot.
I get the IP address/Name/Memory size on a startup and Also
a quick view on how much disk space I have left.
This script as is probably won't work on your systems you
will need to tweak it a bit since it is doing a few greps and awks of the
information.
Happy Slacking!
That is nice!
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