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Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
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Nico Schottelius 2014-03-30 19:36:31 +02:00
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blog/treat-virtual-machines-like-hardware.mdwn
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@ -33,10 +33,10 @@ What about their IP addresses? Where to store, define and assign them?
What are the virtual properties of the VM? How many disks, how much memory and What are the virtual properties of the VM? How many disks, how much memory and
how many cpu (cores) are utilised? how many cpu (cores) are utilised?
To solve these problems, specialised tools like To solve these problems, specialised tools like
[[!libvirt]], [![openstack]] and many other are deployed. [[!libvirt]], [[!openstack]] and many other are deployed.
Problem solved? Problem solved?
## Problem invented: (D)RY ## Problem created: (D)RY
Interestingly, au contraire de common belief, with inventing tools specific to Interestingly, au contraire de common belief, with inventing tools specific to
virtualisation management, new problems have been created: virtualisation management, new problems have been created:
@ -63,14 +63,15 @@ Some of you may now be wondering, ...
In my opinion (I believe in the [[!kiss]]), managing large scale infrastructures can be as easy In my opinion (I believe in the [[!kiss]]), managing large scale infrastructures can be as easy
as managing small infrastructures - given you take the right approach. From a technical as managing small infrastructures - given you take the right approach. From a technical
point of view, manage an infrastucture you need point of view, to manage an infrastucture you need
* an inventory management tool (like [[cinv|software/cinv]]) * an inventory management tool (like [[cinv|software/cinv]])
* that is the central tool to record all your hosts * that is the central tool to record all your hosts
* that defines IP address mapppings (mac<->ip, f.i. [[!dhcp]] and ip<->name, like [[!dns]]) * that defines IP address mapppings (mac<->ip, f.i. [[!dhcp]] and ip<->name, like [[!dns]])
* assists you with lifecycle management of your hosts
* a configuration management system (like [[cdist|software/cdist]]) * a configuration management system (like [[cdist|software/cdist]])
* that realises your centrally defined configurations * that realises your centrally defined configurations
* that manages all your configurations (including VMs!) * that manages all your configurations (including VMs!)
## Summary ## Summary
@ -79,9 +80,10 @@ We at [[!ungleich]] take this approach for every infrastructure of our customers
and so far succeed very well with this approach. We do in fact eat our own dogfood and so far succeed very well with this approach. We do in fact eat our own dogfood
and manage the inventories of our customers (HW and VM!) with [[cinv|software/cinv]] and manage the inventories of our customers (HW and VM!) with [[cinv|software/cinv]]
and configure their infrastructures with [[cdist|software/cdist]]. and configure their infrastructures with [[cdist|software/cdist]].
To support multiple customers, we keep their configurations in To support multiple customers, we keep their configurations under version
different branches using [[!git]] (logically, if you follow the control in different branches using [[!git]] (Logically cdist and
[[!unixphilosophy]]). cdist don't support this, because git can do it much better - we
follow the [[!unixphilosophy]] when developing software).
## Future ## Future