04.11.2017

Microservices: Ubuntu Core and snap - a minimal linux

After some first steps with coreOS
i read about Ubuntu Core, which targets also on a minimal linux. Here an architecture overview from ubuntu:
Ubuntu provides an image for KVM (the link points to an installation howto), but i want to stay with Virtualbox. I followed this tutorial:
wget http://releases.ubuntu.com/ubuntu-core/16/ubuntu-core-16-amd64.img.xz
unxz ubuntu-core-16-amd64.img.xz
VBoxManage convertdd ubuntu-core-16-amd64.img ubuntu-core-16-amd64.vdi --format VDI

VBoxManage modifyhd ubuntu-core-16-amd64.vdi --resize 20480
And then configure the virtualbox vm:




And Go!




To pass this step you have to create an account at https://login.ubuntu.com
 
 At login.ubuntu.com you have to provide your public ssh keyfile:

and then a login which does not work:


and the login via ssh:

schroff@zerberus:~$ ssh d-schroff@192.168.178.31
The authenticity of host '192.168.178.31 (192.168.178.31)' can't be established.
ECDSA key fingerprint is SHA256:yKE/g7JYnlED6jOF/8gsUeVrdkuEU/zytFdlCcVzNEs.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.178.31' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 16.04.1 LTS (GNU/Linux 4.4.0-45-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

Welcome to Snappy Ubuntu Core, a transactionally updated Ubuntu.

 * See https://ubuntu.com/snappy

It's a brave new world here in Snappy Ubuntu Core! This machine
does not use apt-get or deb packages. Please see 'snap --help'
for app installation and transactional updates.

d-schroff@localhost:~$
First impression: Getting a ssh login is much easier than configuring ssh with ignition at coreOS.

If you want to learn how to install and run a webserver with snap, take a look here.
This posting will show, how to build your own application into a snap.

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