Docker vs. Virtual Machines

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DOCKER
VIRTUAL MACHINES
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DOCKER
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Operating System
VIRTUAL MACHINES
Hosted on a single physical server running a
host OS
Have the host OS and guest OS like Linux or
Windows inside each VM regardless of the host OS
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DOCKER
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Size
VIRTUAL MACHINES
Compact and often only a few megabytes in size
Can be many gigabytes or even terabytes in size
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DOCKER
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Portability
VIRTUAL MACHINES
Easily portable due to the lack of a separate OS
and can be launched right away after
being ported to a different OS
Porting is complicated as VMs have their own OS
and takes much longer due to the size of the
virtual computer
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DOCKER
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Used for
VIRTUAL MACHINES
Running multiple applications over a single OS
kernel
Running applications or services on different OS
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DOCKER
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Speed
VIRTUAL MACHINES
Boots immediately due to the OS being operational
Require more time to run applications
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DOCKER
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Security
VIRTUAL MACHINES
Less secure as attackers can compromise
the entire cluster of containers
More secure, so applications requiring greater
security and privileges run on VMs
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DOCKER
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Performance
VIRTUAL MACHINES
Easy to start and performs well
Start slowly and performs poorly
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DOCKER
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Duration to create
VIRTUAL MACHINES
Can be created easily in seconds
Take a relatively long time to create
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DOCKER
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Replicability
VIRTUAL MACHINES
Simple to replicate
Challenging to replicate
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