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CONTAINERS
in
CLOUD FOUNDRY
Application Runtime
+
Container Runtime
A
container
running on a machine is just a
process
on the
host operating system
like any other.
The
unique
part though is in how that process is
isolated
and
restricted
in very
intentional
ways.
STEMCELL
BUILDPACK
APPLICATION
DROPLET
STACK
What is a
STEMCELL
?
A
bare minimum OS
skeleton with a few common utilities pre-installed
+
a
BOSH Agent
, and a few configuration files to
securely
configure the OS by default.
A
stemcell
is the
OS
that runs on the
VM
(or bare metal)
The concept of a
Stemcell
solves the following:
capturing a
base
operating system
versioning
changes
to the
operating system
image
reusing base operating system images across
VMs of different types
reusing base operating system images across
IaaS's of different types
What are
BUILDPACKS
?
Buildpacks provide
framework and runtime support
for your applications.
For Example
The Ruby buildpack
has a
Ruby
interpreter and
Rubygems
Knows how to
install
your application
dependencies
by processing the
Gemfile
What is a
STACK
?
A
stack
is a prebuilt root filesystem (
rootfs
) that supports a specific operating system
cflinuxfs2
or
windows2012R2
What is a
DROPLET
?
A
droplet
is an archive of
application
+
buildpack
DROPLET
+ STACK (rootfs)
=
OCI
CONTAINER
This is then run with
runC
runC
is a cli tool for spawning and running
containers
according to the
OCI
specification
Text
The level of
abstraction
is your
application
not
containers
$ cf push application
I am Mick Pollard
@aussielunix
Containers in Cloud Foundry
By Mick Pollard
Made with Slides.com
Containers in Cloud Foundry
A quick explanation of what is a container in a Cloud Foundry world.
3,117
Mick Pollard
aussie.lunix.com.au
aussielunix
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Mick Pollard