mirror of
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134 lines
3.0 KiB
Markdown
134 lines
3.0 KiB
Markdown
<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
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If you are using a released version of Kubernetes, you should
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refer to the docs that go with that version.
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Documentation for other releases can be found at
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[releases.k8s.io](http://releases.k8s.io).
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</strong>
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--
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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# Notes on Different UX with rkt container runtime
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### Doesn't support ENTRYPOINT + CMD feature
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To run a Docker image, rkt will convert it into [App Container Image (ACI) format](https://github.com/appc/spec/blob/master/SPEC.md) first.
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However, during the conversion, the `ENTRYPOINT` and `CMD` are concatentated to construct ACI's `Exec` field.
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This means after the conversion, we are not able to replace only `ENTRYPOINT` or `CMD` without touching the other part.
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So for now, users are recommended to specify the **executable path** in `Command` and **arguments** in `Args`.
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(This has the same effect if users specify the **executable path + arguments** in `Command` or `Args` alone).
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For example:
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: nginx
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labels:
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name: nginx
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spec:
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containers:
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- name: nginx
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image: nginx
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ports:
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- containerPort: 80
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```
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The above pod yaml file is valid as it's not specifying `Command` or `Args`, so the default `ENTRYPOINT` and `CMD` of the image will be used.
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox
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labels:
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name: busybox
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spec:
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containers:
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- name: busybox
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image: busybox
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command:
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- /bin/sleep
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- 1000
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```
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox
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labels:
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name: busybox
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spec:
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containers:
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- name: busybox
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image: busybox
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command:
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- /bin/sleep
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args:
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- 1000
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```
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox
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labels:
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name: busybox
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spec:
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containers:
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- name: busybox
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image: busybox
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args:
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- /bin/sleep
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- 1000
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```
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All the three examples above are valid as they contain both the executable path and the arguments.
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: busybox
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labels:
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name: busybox
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spec:
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containers:
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- name: busybox
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image: busybox
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args:
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- 1000
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```
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The last example is invalid, as we cannot override just the `CMD` of the image alone.
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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