go构建项目与打包

环境搭建

使用的组件及版本
- operator-sdk v1.22.0
- go 1.20.0 linux/amd64
- git 1.8.3.1
- k8s 1.18.5
- docker 20.10.5
前期配置
- 安装Git yum install git
- 安装docker yum install docker-ce
- 安装go 官网下载 tar -C /usr/local/ -xvf go1.20.linux-amd64.tar.gz
环境配置

// 将go配置到/etc/profile
export GOROOT=/usr/local/go
export GOPATH=/data/gopath // 路径自定义
export PATH=$GOROOT/bin:$PATH
export GO111MODULE=on  //可有可无
export GOPROXY=https://goproxy.cn

source /etc/profile


> - `GO111MODULE=off` 无模块支持，go 会从 GOPATH 和 vendor 文件夹寻找包。
> - `GO111MODULE=on` 模块支持，go 会忽略 GOPATH 和 vendor 文件夹，只根据 `go.mod` 下载依赖。
> - `GO111MODULE=auto` 在 `$GOPATH/src` 外面且根目录有 `go.mod` 文件时，开启模块支持。

安装operator-sdk（直接下载可执行文件）

curl -LO https://github.com/operator-framework/operator-sdk/releases/download/v1.7.2/operator-sdk_linux_amd64
chmod +x operator-sdk_linux_amd64
mv operator-sdk_linux_amd64 /usr/local/bin/operator-sdk

创建项目

创建一个项目目录，使用operator-sdk进行初始化init

mkdir rds-operator
cd rds-operator
operator-sdk init --domain=example.com --repo=paas.cvicse.com/rds/app

创建api

*（注意，若使用低版本如v1.1.0则还需要加一个参数  --make=false，否则会报错。当前使用的版本只需要执行以下命令即可）*
operator-sdk create api --group rds --version v1 --kind Rds --resource=true --controller=true

修改代码（红色标记处需要替换）

修改完后执行命令，重新生成 zz_generated.deepcopy.go 文件
make generate

运行

运行方式两种

本地代码运行
- 代码在k8s节点上，直接在项目的根目录运行如下命令（此方式主要开发测试使用）make generate && make manifests && make install && make run

注意：

本机需确保安装了 kubectl 工具，并且证书文件 ~/.kube/config 存在（保证为集群管理员权限）
测试完毕后使用 ctrl + c 停止程序，然后 make uninstall 删除 crd 定义
若没有发生依赖改变，可直接使用go run main.go指令执行代码

make generate：生成包含 DeepCopy、DeepCopyInto 和 DeepCopyObject 方法实现的代码

make manifests：生成 WebhookConfiguration、ClusterRole 和 CustomResourceDefinition 对象

make install：将 CRD 安装到 ~/.kube/config 中指定的 K8s 集群中

make run：运行代码

make uninstall: 从 ~/.kube/config 中指定的 K8s 集群中卸载 CRD

在k8s集群中运行

修改Dockerfile文件（文件在项目的根目录下），修改内容如下

# Build the manager binary
  FROM golang:1.15 as builder

  WORKDIR /workspace
  # Copy the Go Modules manifests
  COPY go.mod go.mod
  COPY go.sum go.sum
  # cache deps before building and copying source so that we don't need to re-download as much
  # and so that source changes don't invalidate our downloaded layer

  ENV GOPROXY https://goproxy.cn,direct

  RUN go mod download

  # Copy the go source
  COPY main.go main.go
  COPY api/ api/
  COPY controllers/ controllers/
  COPY resource/ resource/

  # Build
  RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager main.go

  # Use distroless as minimal base image to package the manager binary
  # Refer to https://github.com/GoogleContainerTools/distroless for more details

  # 使用 distroless 作为最小基础镜像来打包管理器二进制文件
  # FROM gcr.io/distroless/static:nonroot
  FROM kubeimages/distroless-static:latest
  WORKDIR /
  COPY --from=builder /workspace/manager .
  USER 65532:65532

  ENTRYPOINT ["/manager"]

增加了环境变量 ENV GOPROXY https://goproxy.cn,direct
增加了COPY resource/ resource/
修改FROM镜像 FROM kubeimages/distroless-static:latest

执行如下命令制作镜像

make docker-build IMG=***.***.**.**:5000/redis-operator:v1.0

运行operator-controller-manager
operator-controller-manager运行后会启动两个容器 [kube-rbac-proxy manager]

容器manager所使用的镜像是【步骤2】所制作的镜像

容器kube-rbac-proxy所使用的镜像需要修改（只需修改镜像），路径： 项目根目录/config/default/manager_auth_proxy_patch.yaml，内容如下：

# This patch inject a sidecar container which is a HTTP proxy for the
     # controller manager, it performs RBAC authorization against the Kubernetes API using SubjectAccessReviews.
     apiVersion: apps/v1
     kind: Deployment
     metadata:
       name: controller-manager
       namespace: system
     spec:
       template:
         spec:
           containers:
           - name: kube-rbac-proxy
             image: 124.223.82.79:5000/kube-rbac-proxy:v0.11.0  # 默认镜像为grc.io/kubesphere/kube-rbac-proxy:v0.8.0, 拉取不到，可从dockerhub上拉取, 此镜像需要修改！！！
             args:
             - "--secure-listen-address=0.0.0.0:8443"
             - "--upstream=http://127.0.0.1:8080/"
             - "--logtostderr=true"
             - "--v=10"
             ports:
             - containerPort: 8443
               name: https
           - name: manager
             args:
             - "--health-probe-bind-address=:8081"
             - "--metrics-bind-address=127.0.0.1:8080"
             - "--leader-elect"

kube-rbac-proxy镜像拉取地址: https://hub.docker.com/r/kubesphere/kube-rbac-proxy/tags

执行如下命令创建 operator-controller-manager

make deploy IMG=**.**.**.**:5000/redis-operator:v1.0

创建ClusterRoleBinding

创建operator-controller-manager后，直接创建自定义资源，查看controller的日志会发现权限报错，报错信息如下：

E0210 05:45:33.131287       1 reflector.go:138] pkg/mod/k8s.io/client-go@v0.20.2/tools/cache/reflector.go:167: Failed to watch *v1.StatefulSet: failed to list *v1.StatefulSet: statefulsets.apps is forbidden: User "system:serviceaccount:redis-operator-system:redis-operator-controller-manager" cannot list resource "statefulsets" in API group "apps" at the cluster scope
E0210 05:45:34.271962       1 reflector.go:138] pkg/mod/k8s.io/client-go@v0.20.2/tools/cache/reflector.go:167: Failed to watch *v1.StatefulSet: failed to list *v1.StatefulSet: statefulsets.apps is forbidden: User "system:serviceaccount:redis-operator-system:redis-operator-controller-manager" cannot list resource "statefulsets" in API group "apps" at the cluster scope
E0210 05:45:36.971944       1 reflector.go:138] pkg/mod/k8s.io/client-go@v0.20.2/tools/cache/reflector.go:167: Failed to watch *v1.StatefulSet: failed to list *v1.StatefulSet: statefulsets.apps is forbidden: User "system:serviceaccount:redis-operator-system:redis-operator-controller-manager" cannot list resource "statefulsets" in API group "apps" at the cluster scope
E0210 05:45:40.383080       1 reflector.go:138] pkg/mod/k8s.io/client-go@v0.20.2/tools/cache/reflector.go:167: Failed to watch *v1.StatefulSet: failed to list *v1.StatefulSet: statefulsets.apps is forbidden: User "system:serviceaccount:redis-operator-system:redis-operator-controller-manager" cannot list resource "statefulsets" in API group "apps" at the cluster scope

方案一：直接将controller-manager绑定到集群管理员cluster-admin

创建cluster-admin.yaml文件，内容如下：

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cluster-admin-rolebinding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: redis-operator-controller-manager
  namespace: redis-operator-system

创建命令如下：

kubectl apply -f clutser-admin.yml

方案二：修改rbac目录下role.yaml

创建CRD资源

文件路径： 项目根目录/config/samples/rds_v1_rds.yaml

在项目根目录下执行如下命令进行创建：
```
kubectl apply -f ./config/samples/rds_v1_rds.yaml
```
删除CRD资源
```
make uninstall
```
删除controller-manager
```
make undeploy
```