跑一个demo contorller
1.购买一个海外ECS，系统Centos7.6.避免网络问题。
2.安装golang。
curl https://dl.google.com/go/go1.17.8.linux-amd64.tar.gz -o golang.tar.gz
rm -rf /usr/local/go && tar -C /usr/local -xzf golang.tar.gz
添加下面两列到/etc/profile
export PATH=$PATH:/usr/local/go/bin
export GOPATH=/root/go
source /etc/profile
然后go version查看系统版本。
go version go1.17.8 linux/amd64
go env -w GO111MODULE="on"
3.安装kubebuilder
curl -L -o kubebuilder https://go.kubebuilder.io/dl/latest/$(go env GOOS)/$(go env GOARCH)
chmod +x kubebuilder && mv kubebuilder /usr/local/bin/
4.
mkdir $GOPATH/src/projects/guestbook -p
cd $GOPATH/src/projects/guestbook
kubebuilder init --domain my.domain --repo my.domain/guestbook
[root@10-27-41-134 guestbook]# kubebuilder init --domain my.domain --repo my.domain/guestbook
Writing kustomize manifests for you to edit...
Writing scaffold for you to edit...
Get controller runtime:
$ go get sigs.k8s.io/controller-runtime@v0.11.0
go: downloading sigs.k8s.io/controller-runtime v0.11.0
go: downloading k8s.io/apimachinery v0.23.0
go: downloading github.com/gogo/protobuf v1.3.2
go: downloading github.com/google/gofuzz v1.1.0
go: downloading github.com/go-logr/logr v1.2.0
go: downloading k8s.io/client-go v0.23.0
go: downloading k8s.io/utils v0.0.0-20210930125809-cb0fa318a74b
go: downloading github.com/prometheus/client_golang v1.11.0
go: downloading gopkg.in/inf.v0 v0.9.1
go: downloading github.com/google/go-cmp v0.5.5
go: downloading k8s.io/klog/v2 v2.30.0
go: downloading sigs.k8s.io/structured-merge-diff/v4 v4.2.0
go: downloading golang.org/x/net v0.0.0-20210825183410-e898025ed96a
go: downloading github.com/evanphx/json-patch v4.12.0+incompatible
go: downloading golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
go: downloading gomodules.xyz/jsonpatch/v2 v2.2.0
go: downloading k8s.io/api v0.23.0
go: downloading k8s.io/apiextensions-apiserver v0.23.0
go: downloading github.com/imdario/mergo v0.3.12
go: downloading github.com/spf13/pflag v1.0.5
go: downloading golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b
go: downloading k8s.io/component-base v0.23.0
go: downloading github.com/prometheus/client_model v0.2.0
go: downloading github.com/prometheus/common v0.28.0
go: downloading github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
go: downloading sigs.k8s.io/json v0.0.0-20211020170558-c049b76a60c6
go: downloading github.com/json-iterator/go v1.1.12
go: downloading gopkg.in/yaml.v2 v2.4.0
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f
go: downloading github.com/pkg/errors v0.9.1
go: downloading k8s.io/kube-openapi v0.0.0-20211115234752-e816edb12b65
go: downloading github.com/golang/protobuf v1.5.2
go: downloading github.com/googleapis/gnostic v0.5.5
go: downloading golang.org/x/sys v0.0.0-20211029165221-6e7872819dc8
go: downloading sigs.k8s.io/yaml v1.3.0
go: downloading github.com/beorn7/perks v1.0.1
go: downloading github.com/cespare/xxhash/v2 v2.1.1
go: downloading github.com/prometheus/procfs v0.6.0
go: downloading github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369
go: downloading github.com/google/uuid v1.1.2
go: downloading github.com/fsnotify/fsnotify v1.5.1
go: downloading github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
go: downloading github.com/modern-go/reflect2 v1.0.2
go: downloading golang.org/x/text v0.3.7
go: downloading google.golang.org/protobuf v1.27.1
go: downloading gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
go: downloading google.golang.org/appengine v1.6.7
Update dependencies:
$ go mod tidy
go: downloading github.com/stretchr/testify v1.7.0
go: downloading github.com/onsi/ginkgo v1.16.5
go: downloading github.com/onsi/gomega v1.17.0
go: downloading github.com/go-logr/zapr v1.2.0
go: downloading go.uber.org/zap v1.19.1
go: downloading github.com/pmezard/go-difflib v1.0.0
go: downloading github.com/Azure/go-autorest/autorest v0.11.18
go: downloading github.com/Azure/go-autorest v14.2.0+incompatible
go: downloading github.com/Azure/go-autorest/autorest/adal v0.9.13
go: downloading go.uber.org/goleak v1.1.12
go: downloading go.uber.org/atomic v1.7.0
go: downloading go.uber.org/multierr v1.6.0
go: downloading github.com/benbjohnson/clock v1.1.0
go: downloading gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f
go: downloading github.com/Azure/go-autorest/logger v0.2.1
go: downloading github.com/Azure/go-autorest/tracing v0.6.0
go: downloading github.com/Azure/go-autorest/autorest/mocks v0.4.1
go: downloading github.com/Azure/go-autorest/autorest/date v0.3.0
go: downloading github.com/form3tech-oss/jwt-go v3.2.3+incompatible
go: downloading golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
go: downloading cloud.google.com/go v0.81.0
go: downloading github.com/nxadm/tail v1.4.8
go: downloading github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e
go: downloading golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
go: downloading gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7
go: downloading github.com/kr/text v0.2.0
go: downloading github.com/cespare/xxhash v1.1.0
Next: define a resource with:
$ kubebuilder create api
You have mail in /var/spool/mail/root、
查看目录结构
[root@10-27-41-134 guestbook]# tree
.
├── config
│ ├── default
│ │ ├── kustomization.yaml
│ │ ├── manager_auth_proxy_patch.yaml
│ │ └── manager_config_patch.yaml
│ ├── manager
│ │ ├── controller_manager_config.yaml
│ │ ├── kustomization.yaml
│ │ └── manager.yaml
│ ├── prometheus
│ │ ├── kustomization.yaml
│ │ └── monitor.yaml
│ └── rbac
│ ├── auth_proxy_client_clusterrole.yaml
│ ├── auth_proxy_role_binding.yaml
│ ├── auth_proxy_role.yaml
│ ├── auth_proxy_service.yaml
│ ├── kustomization.yaml
│ ├── leader_election_role_binding.yaml
│ ├── leader_election_role.yaml
│ ├── role_binding.yaml
│ └── service_account.yaml
├── Dockerfile
├── go.mod
├── go.sum
├── hack
│ └── boilerplate.go.txt
├── main.go
├── Makefile
└── PROJECT
6 directories, 24 files
创建API（创建resource和controller）
由于我的k8s集群版本是1.15,低于1.16，其支持的拓展API为 apiextensions.k8s.io/v1beta1版本，所以生成API的命令要加--crd-version v1beta1参数。如果k8s版本低于1.14，还需要更多配置。
支持老版本k8s集群
kubebuilder create api --group webapp --version v1 --kind Guestbook --crd-version v1beta1
[root@10-27-41-134 guestbook]# kubebuilder create api --group webapp --version v1 --kind Guestbook
Create Resource [y/n]
y
Create Controller [y/n]
y
Writing kustomize manifests for you to edit...
Writing scaffold for you to edit...
api/v1/guestbook_types.go
controllers/guestbook_controller.go
Update dependencies:
$ go mod tidy
Running make:
$ make generate
go: creating new go.mod: module tmp
Downloading sigs.k8s.io/controller-tools/cmd/controller-gen@v0.8.0
go: downloading sigs.k8s.io/controller-tools v0.8.0
go: downloading github.com/spf13/cobra v1.2.1
go: downloading github.com/inconshreveable/mousetrap v1.0.0
go: downloading github.com/gobuffalo/flect v0.2.3
go: downloading golang.org/x/tools v0.1.6-0.20210820212750-d4cc65f0b2ff
go: downloading github.com/fatih/color v1.12.0
go: downloading sigs.k8s.io/structured-merge-diff/v4 v4.1.2
go: downloading golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e
go: downloading github.com/mattn/go-colorable v0.1.8
go: downloading github.com/mattn/go-isatty v0.0.12
go: downloading github.com/google/go-cmp v0.5.6
go: downloading golang.org/x/mod v0.4.2
go get: installing executables with 'go get' in module mode is deprecated.
To adjust and download dependencies of the current module, use 'go get -d'.
To install using requirements of the current module, use 'go install'.
To install ignoring the current module, use 'go install' with a version,
like 'go install example.com/cmd@latest'.
For more information, see https://golang.org/doc/go-get-install-deprecation
or run 'go help get' or 'go help install'.
go get: added github.com/fatih/color v1.12.0
go get: added github.com/go-logr/logr v1.2.0
go get: added github.com/gobuffalo/flect v0.2.3
go get: added github.com/gogo/protobuf v1.3.2
go get: added github.com/google/go-cmp v0.5.6
go get: added github.com/google/gofuzz v1.1.0
go get: added github.com/inconshreveable/mousetrap v1.0.0
go get: added github.com/json-iterator/go v1.1.12
go get: added github.com/mattn/go-colorable v0.1.8
go get: added github.com/mattn/go-isatty v0.0.12
go get: added github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
go get: added github.com/modern-go/reflect2 v1.0.2
go get: added github.com/spf13/cobra v1.2.1
go get: added github.com/spf13/pflag v1.0.5
go get: added golang.org/x/mod v0.4.2
go get: added golang.org/x/net v0.0.0-20210825183410-e898025ed96a
go get: added golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e
go get: added golang.org/x/text v0.3.7
go get: added golang.org/x/tools v0.1.6-0.20210820212750-d4cc65f0b2ff
go get: added golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
go get: added gopkg.in/inf.v0 v0.9.1
go get: added gopkg.in/yaml.v2 v2.4.0
go get: added gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
go get: added k8s.io/api v0.23.0
go get: added k8s.io/apiextensions-apiserver v0.23.0
go get: added k8s.io/apimachinery v0.23.0
go get: added k8s.io/klog/v2 v2.30.0
go get: added k8s.io/utils v0.0.0-20210930125809-cb0fa318a74b
go get: added sigs.k8s.io/controller-tools v0.8.0
go get: added sigs.k8s.io/json v0.0.0-20211020170558-c049b76a60c6
go get: added sigs.k8s.io/structured-merge-diff/v4 v4.1.2
go get: added sigs.k8s.io/yaml v1.3.0
/root/go/src/projects/guestbook/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
Next: implement your new API and generate the manifests (e.g. CRDs,CRs) with:
$ make manifests
[root@10-27-41-134 guestbook]# tree
.
├── api
│ └── v1
│ ├── groupversion_info.go
│ ├── guestbook_types.go
│ └── zz_generated.deepcopy.go
├── bin
│ └── controller-gen
├── config
│ ├── crd
│ │ ├── kustomization.yaml
│ │ ├── kustomizeconfig.yaml
│ │ └── patches
│ │ ├── cainjection_in_guestbooks.yaml
│ │ └── webhook_in_guestbooks.yaml
│ ├── default
│ │ ├── kustomization.yaml
│ │ ├── manager_auth_proxy_patch.yaml
│ │ └── manager_config_patch.yaml
│ ├── manager
│ │ ├── controller_manager_config.yaml
│ │ ├── kustomization.yaml
│ │ └── manager.yaml
│ ├── prometheus
│ │ ├── kustomization.yaml
│ │ └── monitor.yaml
│ ├── rbac
│ │ ├── auth_proxy_client_clusterrole.yaml
│ │ ├── auth_proxy_role_binding.yaml
│ │ ├── auth_proxy_role.yaml
│ │ ├── auth_proxy_service.yaml
│ │ ├── guestbook_editor_role.yaml
│ │ ├── guestbook_viewer_role.yaml
│ │ ├── kustomization.yaml
│ │ ├── leader_election_role_binding.yaml
│ │ ├── leader_election_role.yaml
│ │ ├── role_binding.yaml
│ │ └── service_account.yaml
│ └── samples
│ └── webapp_v1_guestbook.yaml
├── controllers
│ ├── guestbook_controller.go
│ └── suite_test.go
├── Dockerfile
├── go.mod
├── go.sum
├── hack
│ └── boilerplate.go.txt
├── main.go
├── Makefile
└── PROJECT
13 directories, 37 files
编译windows可用的controller(GOGO=windows)
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -o manager main.go
生成的控制器没有任何业务逻辑，空架子
make install会在config/crd/base目录下生成webapp.my.domain_guestbooks.yaml，然后apply。
make manifests只生成crd。
按照config/crd/base/webapp.my.domain_guestbooks.yaml 修改config/samples/webapp_v1_guestbook.yaml中的spec字段，此处修改为
将config/crd/base/webapp.my.domain_guestbooks.yaml和config/samples/webapp_v1_guestbook.yaml apply
