docs: add doc about cri-annotation-support

Signed-off-by: Starnop <starnop@163.com>

.circleci/config.yml

@@ -13,7 +13,7 @@ jobs:
       - run:
           name: use markdownlint v0.4.0 to lint markdown file (https://github.com/markdownlint/markdownlint)
           command: |
-            find  ./ -name  "*.md" | grep -v vendor | grep -v commandline |  grep -v .github |  grep -v swagger |  grep -v api |  xargs mdl -r ~MD010,~MD013,~MD024,~MD029,~MD033,~MD036
+            find  ./ -name  "*.md" | grep -v vendor | grep -v commandline |  grep -v .github |  grep -v swagger |  grep -v api |  xargs mdl -r ~MD009, ~MD010,~MD013,~MD022,~MD024,~MD029,~MD031,~MD033,~MD036
       - run:
           name: use opensource tool client9/misspell to correct commonly misspelled English words 
           command: |

docs/kubernetes/pouch_cri_annotation_support.md

@@ -0,0 +1,154 @@
+# CRI ANNOTATIONS SUPPORTED CHANGELOG
+
+* [Overview](#overview "Overview")
+* [The Annotations Supported](#the-annotations-supported "The Annotations Supported")
+  * [Make runtime choosing supported](#make-runtime-choosing-supported "Make runtime choosing supported")
+  * [Make lxcfs configurable supported](#make-lxcfs-configurable-supported "Make lxcfs configurable supported")
+* [Pull Request](#pull-request "Pull Request")
+
+## Overview
+
+Currently, PouchContainer has lots of advantages over other container runtimes, such as:
+
+* resource review isolation via lxcfs
+* runtime choosing for runc-based container or runv-based containers
+* and so on
+
+While actually in kubernetes, there is no related API to support these feature.
+
+While for these extended features in Kubernetes, Kubernetes has a hiden way to support this: make user-defined parameters in annotations field in pod's definition.
+When CRI manager deals the annotation details, it could pass these parameters to container manager, and container manager definitely implement these features very well.
+
+So, we need to accomplish the following things:
+
+* define the specific naming in annotations for each feature;
+* implement the transformation in CRI manager and pass them to container manager.
+
+Kubernetes Version: V1.10.0+
+
+## The Annotations Supported
+
+| Requirement                       | Field definition                             | Pull Request                               |
+|-----------------------------------|----------------------------------------------|--------------------------------------------|
+| make runtime choosing supported   | KubernetesRuntime = "io.kubernetes.runtime"  | https://github.com/alibaba/pouch/pull/1593 |
+| make lxcfs configurable supported | LxcfsEnabled = "io.kubernetes.lxcfs.enabled" | https://github.com/alibaba/pouch/pull/2210 |
+
+### Make runtime choosing supported
+
+#### What To Solve
+
+1. Support choosing the runtime for a container by making runtime choosing supported.
+
+#### How to verify it
+
+1. Prerequisites Installation, the runtime binaries you will use is necessary.
+
+2. You should start pouchd with the configuration like this:
+
+```
+pouchd --enable-cri --cri-version v1alpha2 --add-runtime runv=runv >pouchd.log 2>&1  &
+```
+
+3. After setting up your kubernetes cluster, you can create a deployment like this :
+
+```
+# cat pouch.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pouch
+  labels:
+    pouch: pouch
+spec:
+  selector:
+    matchLabels:
+      pouch: pouch
+  template:
+    metadata:
+      labels:
+        pouch: pouch
+      annotations:
+        io.kubernetes.lxcfs.enabled: "true"
+    spec:
+      containers:
+      - name: pouch
+        image: docker.io/library/busybox:latest
+        command:
+          - top
+        resources:
+          requests:
+            memory: "256Mi"
+          limits:
+            memory: "256Mi"
+            
+# kubectl create -f pouch.yaml
+```
+
+4. Use command `pouch ps` to observe the runtime of the container.
+
+### Make lxcfs configurable supported
+
+#### What To Solve
+
+1. Support resource review isolation via lxcfs in CRI Manager by making lxcfs configurable supported.
+
+#### How to verify it
+
+1. Prerequisites Installation and make sure your lxcfs service is running.
+
+2. Enable pouchd lxcfs (with --enable-lxcfs flag).
+
+3. After setting up your kubernetes cluster, you can create a deployment like this :
+
+```
+# cat pouch.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pouch
+  labels:
+    pouch: pouch
+spec:
+  selector:
+    matchLabels:
+      pouch: pouch
+  template:
+    metadata:
+      labels:
+        pouch: pouch
+      annotations:
+        io.kubernetes.lxcfs.enabled: "true"
+    spec:
+      containers:
+      - name: pouch
+        image: docker.io/library/busybox:latest
+        command:
+          - top
+        resources:
+          requests:
+            memory: "256Mi"
+          limits:
+            memory: "256Mi"
+
+# kubectl create -f pouch.yaml
+```
+
+4. View the results.
+
+```
+# pouch ps
+Name                                                                                                           ID       Status       Created       Image                                                                 Runtime
+k8s_pouch_pouch-5ddd8fc467-rmtcw_default_bc4b7972-b181-11e8-adae-42010a8c0003_0                                5391a9   Up 8 hours   8 hours ago   docker.io/library/busybox:latest                                      runc
+k8s_POD_pouch-5ddd8fc467-rmtcw_default_bc4b7972-b181-11e8-adae-42010a8c0003_0                                  60a833   Up 8 hours   8 hours ago   registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0   runc
+
+# pouch exec k8s_pouch_pouch-5ddd8fc467-rmtcw_default_bc4b7972-b181-11e8-adae-42010a8c0003_0 cat /proc/meminfo 
+MemTotal:         262144 kB
+MemFree:          261368 kB
+MemAvailable:     261368 kB
+......
+```
+
+## Pull Request
+
+* feature: make runtime choosing supported [#1593](https://github.com/alibaba/pouch/pull/1593)
+* feature: make lxcfs configurable supportd in CRI [#2210](https://github.com/alibaba/pouch/pull/2210)

docs/kubernetes/pouch_cri_api_changelog.md

@@ -311,4 +311,4 @@ message Mount {
 + feature: extend cri apis for special needs [#1617](https://github.com/alibaba/pouch/pull/1617)
 + feature: extend cri apis for remove volume [#2124](https://github.com/alibaba/pouch/pull/2124)
 + feature: extend cri apis for support quotaID [#2138](https://github.com/alibaba/pouch/pull/2138)
-
++ feature: extend cri apis for get envs [#2163](https://github.com/alibaba/pouch/pull/2163)