kubernetes系列之十六：Kubernetes CRD sample-controller的编译和测试
一、前言
在文章《kubernetes系列之十四：Kubernetes CRD(CustomResourceDefinition)概览》中，对于Kubernetes官方提供的CRD例子进行了分析，包括CRD的定义以及后端controller的实现。同时如下两篇文章也对k8s的controller进行了更详尽的分析和示例：
- A Deep Dive Into Kubernetes Controllers
- Kubewatch, An Example Of Kubernetes Custom Controller
但是由于k8s官方提供的CRD以及controller的例子没有相关编译和运行的说明，本文将给出step-by-step设置编译环境和进行编译的例子，以及通过Dockerfile进行一键编译和运行的例子。
转载自https://blog.csdn.net/cloudvtech
二、CRD example-controllerde编译
2.1 编译环境
CentOS Linux release 7.4.1708 (Core)
yum install -y go git
2.2 下载代码和依赖
mkdir /root/gowork
export GOPATH=/root/gowork/
cd /root/gowork/
git clone https://github.com/kubernetes/sample-controller.git
mv sample-controller src
cd src
mkdir -p k8s.io/sample-controller
cp -a pkg k8s.io/sample-controller
go get k8s.io/apimachinery其中安装apimachinery是根据这篇文章的提示，否则会出现类似如下错误：
Error: Failed executing generator: some packages had errors:
type "k8s.io/apimachinery/pkg/runtime.Object" in k8s:deepcopy-gen:interfaces tag of type k8s.io/apimachinery/pkg/runtime.Object is not an interface, but: ""
goroutine 1 [running]:2.3 运行codegen
./hack/update-codegen.sh
Generating deepcopy funcs
Generating clientset for samplecontroller:v1alpha1 at k8s.io/sample-controller/pkg/client/clientset
Generating listers for samplecontroller:v1alpha1 at k8s.io/sample-controller/pkg/client/listers
Generating informers for samplecontroller:v1alpha1 at k8s.io/sample-controller/pkg/client/informers\cp -af vendor/* ./
rm -rf vendor/
go build -v -o samplecontroller
…
k8s.io/sample-controller/pkg/apis/samplecontroller
k8s.io/sample-controller/pkg/apis/samplecontroller/v1alpha1
k8s.io/sample-controller/pkg/client/clientset/versioned/scheme
k8s.io/sample-controller/pkg/client/clientset/versioned/typed/samplecontroller/v1alpha1
k8s.io/sample-controller/pkg/client/clientset/versioned
k8s.io/sample-controller/pkg/client/informers/externalversions/internalinterfaces
k8s.io/sample-controller/pkg/client/listers/samplecontroller/v1alpha1
k8s.io/sample-controller/pkg/client/informers/externalversions/samplecontroller/v1alpha1
k8s.io/sample-controller/pkg/client/informers/externalversions/samplecontroller
k8s.io/sample-controller/pkg/client/informers/externalversions
k8s.io/sample-controller/pkg/signals编译出来的binary名为samplecontroller，在src目录下面。
转载自https://blog.csdn.net/cloudvtech
三、运行sample-controller并部署CRD
3.1 example CRD的功能
这个CRD的功能就是在Foo类型CRD的实例example-foo被创建的时候，sample-controller根据example-foo里面指定的replica来部署一个具有相应数目replica的nginx的deployment。
3.2 运行sample-controller
sample-controller的参数如下：
./samplecontroller --help
Usage of ./samplecontroller:
-alsologtostderr
log to standard error as well as files
-kubeconfig string
Path to a kubeconfig. Only required if out-of-cluster.
-log_backtrace_at value
when logging hits line file:N, emit a stack trace
-log_dir string
If non-empty, write log files in this directory
-logtostderr
log to standard error instead of files
-master string
The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.
-stderrthreshold value
logs at or above this threshold go to stderr
-v value
log level for V logs
-vmodule value
comma-separated list of pattern=N settings for file-filtered logging通过kubeconfig可以指定cluster的access，测试Kubernetes的cluster的kubeconfig在如下位置：
/etc/kubernetes/admin.conf 运行：
./samplecontroller -kubeconfig /etc/kubernetes/admin.conf
3.3 部署CRD
[root@k8s-master src]# kubectl apply -f artifacts/examples/crd.yaml
customresourcedefinition.apiextensions.k8s.io "foos.samplecontroller.k8s.io" created
[root@k8s-master src]# kubectl apply -f artifacts/examples/example-foo.yaml
foo.samplecontroller.k8s.io "example-foo" created3.4 查看状态
[root@k8s-master src]# kubectl get crd
NAME AGE
foos.samplecontroller.k8s.io 52s
[root@k8s-master src]# kubectl get Foo
NAME AGE
example-foo 44s
[root@k8s-master src]# kubectl describe Foo example-foo
Name: example-foo
Namespace: default
Labels:
Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"samplecontroller.k8s.io/v1alpha1","kind":"Foo","metadata":{"annotations":{},"name":"example-foo","namespace":"default"},"spec":{"deploym...
API Version: samplecontroller.k8s.io/v1alpha1
Kind: Foo
Metadata:
Cluster Name:
Creation Timestamp: 2018-05-25T20:28:47Z
Generation: 1
Resource Version: 79222
Self Link: /apis/samplecontroller.k8s.io/v1alpha1/namespaces/default/foos/example-foo
UID: 3a4e7cd3-605a-11e8-9f24-000c29d3e746
Spec:
Deployment Name: example-foo
Replicas: 1
Status:
Available Replicas: 1
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Synced 16s (x8 over 1m) sample-controller Foo synced successfully 查看deployment和POD
[root@k8s-master src]# kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
example-foo 1 1 1 1 1m
[root@k8s-master src]# kubectl get pods
NAME READY STATUS RESTARTS AGE
example-foo-d74cd7fbc-nql68 1/1 Running 0 2m转载自https://blog.csdn.net/cloudvtech
四、Dockerfile方式编译和部署
4.1 Dockerfile
FROM centos
ENV PATH=$PATH:/user/bin/
ENV GOPATH=/gowork
WORKDIR /gowork
RUN yum install -y go git
RUN git clone https://github.com/kubernetes/sample-controller.git
RUN mv sample-controller src
WORKDIR /gowork/src
RUN mkdir -p k8s.io/sample-controller
RUN cp -a pkg k8s.io/sample-controller
RUN echo || go get k8s.io/apimachinery
RUN \cp -af vendor/* ./
RUN rm -rf vendor/
RUN go build -v -o samplecontroller4.2 build
docker build -t samplecontrolle .
4.3 运行
[root@k8s-master sample-controller_docker]# docker run -it -v /etc/kubernetes:/k8s a9
[root@9640be7aa387 src]# /gowork/src/samplecontroller -kubeconfig /k8s/admin.conf 转载自https://blog.csdn.net/cloudvtech