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