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Qiming Teng 2024-08-26 06:58:06 +08:00 committed by GitHub
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@ -122,6 +122,7 @@ Let's take a look at why Kubernetes is so useful by going back in time.
![Deployment evolution](/images/docs/Container_Evolution.svg) ![Deployment evolution](/images/docs/Container_Evolution.svg)
**Traditional deployment era:** **Traditional deployment era:**
Early on, organizations ran applications on physical servers. There was no way to define Early on, organizations ran applications on physical servers. There was no way to define
resource boundaries for applications in a physical server, and this caused resource resource boundaries for applications in a physical server, and this caused resource
allocation issues. For example, if multiple applications run on a physical server, there allocation issues. For example, if multiple applications run on a physical server, there
@ -130,7 +131,9 @@ the other applications would underperform. A solution for this would be to run e
on a different physical server. But this did not scale as resources were underutilized, and it on a different physical server. But this did not scale as resources were underutilized, and it
was expensive for organizations to maintain many physical servers. was expensive for organizations to maintain many physical servers.
**Virtualized deployment era:** As a solution, virtualization was introduced. It allows you **Virtualized deployment era:**
As a solution, virtualization was introduced. It allows you
to run multiple Virtual Machines (VMs) on a single physical server's CPU. Virtualization to run multiple Virtual Machines (VMs) on a single physical server's CPU. Virtualization
allows applications to be isolated between VMs and provides a level of security as the allows applications to be isolated between VMs and provides a level of security as the
information of one application cannot be freely accessed by another application. information of one application cannot be freely accessed by another application.
@ -143,7 +146,9 @@ resources as a cluster of disposable virtual machines.
Each VM is a full machine running all the components, including its own operating Each VM is a full machine running all the components, including its own operating
system, on top of the virtualized hardware. system, on top of the virtualized hardware.
**Container deployment era:** Containers are similar to VMs, but they have relaxed **Container deployment era:**
Containers are similar to VMs, but they have relaxed
isolation properties to share the Operating System (OS) among the applications. isolation properties to share the Operating System (OS) among the applications.
Therefore, containers are considered lightweight. Similar to a VM, a container Therefore, containers are considered lightweight. Similar to a VM, a container
has its own filesystem, share of CPU, memory, process space, and more. As they has its own filesystem, share of CPU, memory, process space, and more. As they