diff --git a/slides/containers/Pods_Anatomy.md b/slides/containers/Pods_Anatomy.md new file mode 100644 index 00000000..e5272970 --- /dev/null +++ b/slides/containers/Pods_Anatomy.md @@ -0,0 +1,47 @@ +# Container Super-structure + +- Multiple orchestration platforms support some kind of container super-structure. + + (i.e., a construct or abstraction bigger than a single container.) + +- For instance, on Kubernetes, this super-structure is called a *pod*. + +- A pod is a group of containers (it could be a single container, too). + +- These containers run together, on the same host. + + (A pod cannot straddle multiple hosts.) + +- All the containers in a pod have the same IP address. + +- How does that map to the Docker world? + +--- + +class: pic + +## Anatomy of a Pod + +![Pods](images/kubernetes_pods.svg) + +--- + +## Pods in Docker + +- The containers inside a pod share the same network namespace. + + (Just like when using `docker run --net=container:` with the CLI.) + +- As a result, they can communicate together over `localhost`. + +- In addition to "our" containers, the pod has a special container, the *sandbox*. + +- That container uses a special image: `k8s.gcr.io/pause`. + + (This is visible when listing containers running on a Kubernetes node.) + +- Containers within a pod have independent filesystems. + +- They can share directories by using a mechanism called *volumes.* + + (Which is similar to the concept of volumes in Docker.) diff --git a/slides/images/kubernetes_pods.drawio b/slides/images/kubernetes_pods.drawio new file mode 100644 index 00000000..05573b10 --- /dev/null +++ b/slides/images/kubernetes_pods.drawio @@ -0,0 +1 @@ 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 \ No newline at end of file diff --git a/slides/images/kubernetes_pods.svg b/slides/images/kubernetes_pods.svg new file mode 100644 index 00000000..b878be95 --- /dev/null +++ b/slides/images/kubernetes_pods.svg @@ -0,0 +1,3 @@ + + +
host (/var/lib/kubelet/...)
<div>host (/var/lib/kubelet/...)<br></div>
Pod
Pod
pause container
pause container
nginx
nginx
prometheus exporter
prometheus exporter
Network & IPC
namespace sharing
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:80
:80
private IP
private IP \ No newline at end of file diff --git a/slides/intro-fullday.yml b/slides/intro-fullday.yml index 7daec807..17837293 100644 --- a/slides/intro-fullday.yml +++ b/slides/intro-fullday.yml @@ -69,6 +69,7 @@ chapters: #- containers/Containers_From_Scratch.md - - containers/Container_Engines.md + - containers/Pods_Anatomy.md #- containers/Ecosystem.md - containers/Orchestration_Overview.md - shared/thankyou.md diff --git a/slides/intro-selfpaced.yml b/slides/intro-selfpaced.yml index 07a5bca6..03bf7bca 100644 --- a/slides/intro-selfpaced.yml +++ b/slides/intro-selfpaced.yml @@ -60,6 +60,7 @@ chapters: - containers/Copy_On_Write.md #- containers/Containers_From_Scratch.md - - containers/Container_Engines.md + - containers/Pods_Anatomy.md - containers/Ecosystem.md - containers/Orchestration_Overview.md - shared/thankyou.md