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@@ -21,12 +21,12 @@ are VMWare's vmdk, Oracle Virtualbox's vdi, and Amazon EC2's ami. In theory thes
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automatically package their application into a "machine" for easy distribution and deployment. In practice, that almost never
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automatically package their application into a "machine" for easy distribution and deployment. In practice, that almost never
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happens, for a few reasons:
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happens, for a few reasons:
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- * *Size*: VMs are very large which makes them impractical to store and transfer.
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- * *Performance*: running VMs consumes significant CPU and memory, which makes them impractical in many scenarios, for example local development of multi-tier applications, and
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- large-scale deployment of cpu and memory-intensive applications on large numbers of machines.
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- * *Portability*: competing VM environments don't play well with each other. Although conversion tools do exist, they are limited and add even more overhead.
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- * *Hardware-centric*: VMs were designed with machine operators in mind, not software developers. As a result, they offer very limited tooling for what developers need most:
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- building, testing and running their software. For example, VMs offer no facilities for application versioning, monitoring, configuration, logging or service discovery.
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+ * *Size*: VMs are very large which makes them impractical to store and transfer.
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+ * *Performance*: running VMs consumes significant CPU and memory, which makes them impractical in many scenarios, for example local development of multi-tier applications, and
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+ large-scale deployment of cpu and memory-intensive applications on large numbers of machines.
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+ * *Portability*: competing VM environments don't play well with each other. Although conversion tools do exist, they are limited and add even more overhead.
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+ * *Hardware-centric*: VMs were designed with machine operators in mind, not software developers. As a result, they offer very limited tooling for what developers need most:
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+ building, testing and running their software. For example, VMs offer no facilities for application versioning, monitoring, configuration, logging or service discovery.
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By contrast, Docker relies on a different sandboxing method known as *containerization*. Unlike traditional virtualization,
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By contrast, Docker relies on a different sandboxing method known as *containerization*. Unlike traditional virtualization,
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containerization takes place at the kernel level. Most modern operating system kernels now support the primitives necessary
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containerization takes place at the kernel level. Most modern operating system kernels now support the primitives necessary
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Victor Vieux