CoreOS + Mail + Toolbox + Updates.

[Teedo]

Hi,

I'm trying to setup a systemd startup script/service so that every time CoreOS boots up, it sends an me email so that I can get an idea when an update happened.  Or even a script that sends a "hello" mail to me when i run it at the command line.

Of course, the command mail or mailx doesn't exist in CoreOS so I have to run "toolbox" and fork a fedora container and install it there.  The problem is that the installed mail tools are only available inside the toolbox's fedora container.  Since I'm trying to set up scripts/service outside of the fedora container that obviously won't work.  

My question is:

In a case like this, is there a parameter to pass to toolbox to tell it you want run a command inside it's fedora container without launching the fedora container?  Or do we have to keep a separate OS container running and do something like this:

docker exec -it {OS_Container} /bin/echo "Test Mail" | /usr/bin/mailx ........................... us...@somedomain.com 

Thanks in advance!

[Brandon Philips]

Hello Teedo-

This is totally untested.

I would suggest doing docker export as the toolbox script does and then instead of doing systemd-nspawn. Something like:

/usr/bin/chroot /var/lib/toolbox/core-fedora-latest /bin/bash -c 'echo "Test Mail" | mailx us...@somedomain.com'

Brandon

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[Teedo]

Thanks for the quick response Brian.   I'll look into modifying the toolbox script and will post the results.

Teedo

[Teedo]

Oops.  I meant Brandon.  :)

Teedo

[Adrien]

Hi Teedo,

It's an older topic, but that's exactly what I want to do. 

Can you tell me your configuration now ? With toolbox ? With a container ? ..

Thanks.

[Adrien]

Hi Teedo, 

I follow-up your private answer after my private message, and I can tell you that I have a solution !

On a reboot for example, my docker containers restart auto and I receive an email on my mailbox :)

My solution is : 

A systemd script enable at startup and it call a script to send email.

This script to send email is based on this container : https://github.com/xueshanf/docker-aws-ses

It based on AWS SES to send email (my coreos is stored on AWS and I have un account in SES) but I think there is others containers with gmail or other (sendmail).

For your second question, yes it is possible to run commands from coreos inside the toolbox container like that : 

toolbox -q mkdir /home/toto

// and the folder /home/toto was created in the toolbox and you are always in your coreos

// g for quiet

So you can also run command to send email from toolbox but I didn't test it.

I hope I help you (and others ?) with my message and don't hesitate to contact me if needed.

Adrien