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Ignite Talk DevOpsDays Berlin 2014 helb by Joern Bartel
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Docker offshore – packaging applications for hard to reach data- centers
Joern Barthel
Berlin, 23.10.2014
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Benefits
Executable documentation
“What you check in is what you
get”
Determinism for your runtime
environment
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Not so fast, not so reliable
Age of vessel & equipment
Geolocation
Geopolitics
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Solution: immutable environments
Docker!
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Docker in a nutshell
Golang client & server
Containers virtualize perspective
not hardware
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Immutable images
Build
Name and distribute
Run (as containers)
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What’s in abuild?
Commands build layers
Union of changes
Environment
Immutable filesystem
Caching rules
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What’s in aname?
Repository of images
Projects names, git revisions,
versions etc.
Implicit pull & push
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What’s in a container?
Parameterized process
Sharing ports, volumes
Restricting stuff
Mutable filesystem
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Easier determinism
Same image everywhere
Easier reasoning about state of
remote datacenter
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Ship changes
Save bandwidth by shipping only
incremental diffs
Release or patch
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Simplified packaging
Concrete provisioning
No custom packaging for LTS
environments
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Separation of concerns
Regulations!
Developers build images
Operators run containers
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Summary
Being immutable helps with
reasoning
Concrete vs. abstract reduces
complexity
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