k8s原生配置管理Kustomize利器生成资源

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

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目录

• 一.kustmize生成资源方式
• 二.configMapGenerator生成cm资源清单
  • 1 基于属性文件来生成configMap资源清单
• 三.基于env文件生成configMap资源清单
  • 2 deploy引用cm资源实战
  • 2.1 创建工作目录
  • 2.2 创建用于生成cm的配置文件
  • 2.3 deploy引用cm资源
  • 2.4 创建kustomization.yaml文件，让"deployments.yaml"文件引用cm资源的名称
  • 2.5 生成deployment引用configMap资源清单
• 四.设置贯穿性字段方法
  • 1 贯穿性字段使用场景说明
  • 2 创建测试目录
  • 3 编写deploy资源清单原模板
  • 4 创建kustomization.yaml文件
  • 5 基于kustomize生成deploy模板
• 五.组合资源
  • 1 组合资源概述
  • 2 组合案例
    • 2.1 创建测试目录
    • 2.2 编写deploy资源清单
    • 2.3 编写svc资源清单
    • 2.4 创建kustomization.yaml文件组合deploy和svc资源
    • 2.5 基于kustomize生成模板
• 六 全局补丁patchStrategicMerge
  • 1 patchStrategicMerge概述
  • 2 编写deploy资源清单
  • 3 生成一个patch_replicas.yaml补丁文件
  • 4 生成另一个补丁patch_resources.yaml补丁文件
  • 5 创建kustomization.yaml文件进行打补丁
  • 6 基于kustomize生成模板
• 七 布局补丁patchesJson6902
  • 1 patchesJson6902概述
  • 2 编写deploy资源清单
  • 3 创建一个patch_json_replicas.yaml补丁文件
  • 4 创建kustomization.yaml文件进行打补丁
  • 5 基于kustomize生成模板
• 八.kustomization.yaml的images字段修改镜像
  • 1 image概述
  • 2 编写deploy资源清单
  • 3 创建kustomization.yaml文件进行动态注入
  • 4 测试验证
• 八 kustomization.yaml的replicas字段修改副本数
  • 1 replicas概述
  • 2 编写deploy资源清单
  • 3 创建kustomization.yaml文件进行动态注入
• 九 基于变量注入字段替换名称引用
  • 1 变量注入字段概述
  • 2 编写MySQL相关的资源清单
  • 3 编写wordpress相关的资源清单
  • 4 创建kustomization.yaml文件编写
  • 5 测试验证

一.kustmize生成资源方式

configMap和secret包含其他kubernetes对象(如Pod)所需要的配置或铭感数据来源往往是集群外部，例如某个".properties",".my.cnf"等文件或者SSH秘钥文件。

kustmize提供secretGenerator和configMapGenerator，可以基于文件或字面值来生成secret和configMap。

推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/configmapgenerator/
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/secretgenerator/

二.configMapGenerator生成cm资源清单

1 基于属性文件来生成configMap资源清单

	1.创建存放kustomize相关的目录信息
[root@master231 yinzhengjie]# mkdir -pv kustomize/cm

	2.创建application.properties测试文件
[root@master231 yinzhengjie]# cat > kustomize/cm/application.properties <<EOF
HOST=10.0.0.250
USER=admin
PASSWORD="1"
EOF

	3.创建kustomization.yaml文件
[root@master231 yinzhengjie]# cat > kustomize/cm/kustomization.yaml << EOF
configMapGenerator:
- name: yinzhengjie-cm-harbor
  files:
  - application.properties
EOF


	4.生成configMap资源清单
[root@master231 yinzhengjie]# kubectl kustomize kustomize/cm/
apiVersion: v1
data:
  application.properties: |
    HOST=10.0.0.250
    USER=admin
    PASSWORD="1"
kind: ConfigMap
metadata:
  name: yinzhengjie-cm-harbor-dmgd2c6dct
[root@master231 yinzhengjie]#  

三.基于env文件生成configMap资源清单

	1.创建存放kustomize相关的目录信息
[root@master231 yinzhengjie]# mkdir kustomize/cm/env

	2.创建jdk.sh测试文件
[root@master231 yinzhengjie]# cat > kustomize/cm/env/jdk.sh <<'EOF'
JAVA_HOME=/yinzhengjie/softwares/jdk
PATH=$PATH:$JAVA_HOME/bin
EOF

	3.创建kustomization.yaml文件
[root@master231 yinzhengjie]# cat > kustomize/cm/env/kustomization.yaml << EOF
configMapGenerator:
- name: yinzhengjie-cm-envs-jdk
  envs:
  - jdk.sh
EOF

	4.生成configMap资源清单
[root@master231 yinzhengjie]# kubectl kustomize kustomize/cm/env
apiVersion: v1
data:
  JAVA_HOME: /yinzhengjie/softwares/jdk
  PATH: $PATH:$JAVA_HOME/bin
kind: ConfigMap
metadata:
  name: yinzhengjie-cm-envs-jdk-k2fc6768cf
[root@master231 yinzhengjie]# 

2 deploy引用cm资源实战

2.1 创建工作目录

[root@master231 yinzhengjie]# mkdir kustomize/deploy

2.2 创建用于生成cm的配置文件

[root@master231 yinzhengjie]# cat > kustomize/deploy/application.properties <<EOF
HOST=10.0.0.250
USER=admin
PASSWORD="1"
EOF

2.3 deploy引用cm资源

[root@master231 yinzhengjie]# cat > kustomize/deploy/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      volumes:
      - name: data
        configMap:
          name: yinzhengjie-cm-harbor
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
        volumeMounts:
        - name: data
          mountPath: /yinzhengjie/cm
EOF

2.4 创建kustomization.yaml文件，让"deployments.yaml"文件引用cm资源的名称

[root@master231 yinzhengjie]# cat > kustomize/deploy/kustomization.yaml << EOF
resources:
- deployments.yaml
configMapGenerator:
- name: yinzhengjie-cm-harbor
  files:
  - application.properties
EOF	

2.5 生成deployment引用configMap资源清单

[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/
apiVersion: v1
data:
  application.properties: |
    HOST=10.0.0.250
    USER=admin
    PASSWORD="1"
kind: ConfigMap
metadata:
  name: yinzhengjie-cm-harbor-dmgd2c6dct
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        name: c1
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: /yinzhengjie/cm
          name: data
      volumes:
      - configMap:
          name: yinzhengjie-cm-harbor-dmgd2c6dct
        name: data
[root@master231 yinzhengjie]# 

四.设置贯穿性字段方法

1 贯穿性字段使用场景说明

贯穿性字段的一些使用场景如下:
	- 为对象添加相同的标签(Labels)集合;
	- 为所有对象添加注解(annotations)集合;
	- 为所有的资源设置相同的名称空间(namespace);
	- 为所有对象添加相同的前缀或后缀;
	
	
推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/commonannotations/
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/commonlabels/
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/namespace/
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/nameprefix/
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/namesuffix/

2 创建测试目录

[root@master231 yinzhengjie]# mkdir -pv kustomize/deploy/case-demo-2

3 编写deploy资源清单原模板

[root@master231 yinzhengjie]# cat > kustomize/deploy/case-demo-2/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

4 创建kustomization.yaml文件

[root@master231 yinzhengjie]# cat > kustomize/deploy/case-demo-2/kustomization.yaml << EOF
resources:
- deployments.yaml
namespace: kube-public
namePrefix: production-env-
nameSuffix: "-001"
commonLabels:
  apps: xiuxian
commonAnnotations:
  version: v1
EOF	



温馨提示:
	resources:
		表示针对那个资源清单作为基础模板。
	namespace:
		添加名称空间字段。
	namePrefix:
		添加资源名称的前缀。
	nameSuffix:
		添加资源名称的后缀。
	commonLabels:
		添加标签，若模板有标签，则直接覆盖。
	commonAnnotations
		添加注解标签。

5 基于kustomize生成deploy模板

[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/case-demo-2/
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    version: v1
  labels:
    apps: xiuxian
  name: production-env-deploy-xiuxian-001
  namespace: kube-public
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: xiuxian
  template:
    metadata:
      annotations:
        version: v1
      labels:
        apps: xiuxian
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        name: c1
        ports:
        - containerPort: 80
[root@master231 yinzhengjie]# 

五.组合资源

1 组合资源概述

kustomize提供基于不同文件来组织资源并向其应用补丁或者其他定制的能力。

kustomize支持组合不同的资源，kustomization.yaml文件中的resources字段定义配置要包含的资源列表。

2 组合案例

2.1 创建测试目录

[root@master231 yinzhengjie]# mkdir kustomize/deploy/case-demo-3

2.2 编写deploy资源清单

[root@master231 yinzhengjie]# cat > kustomize/deploy/case-demo-3/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

2.3 编写svc资源清单

[root@master231 yinzhengjie]# cat > kustomize/deploy/case-demo-3/service.yaml <EOF
apiVersion: v1
kind: Service
metadata:
  name: svc-xiuxian
  labels:
    auther: yinzhengjie-svc
spec:
  type: ClusterIP
  ports:
  - port: 80
  selector:
    apps: v1
EOF

2.4 创建kustomization.yaml文件组合deploy和svc资源

[root@master231 yinzhengjie]# cat > kustomize/deploy/case-demo-3/kustomization.yaml << 'EOF'
resources:
- deployments.yaml
- service.yaml
EOF	

2.5 基于kustomize生成模板

[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/case-demo-3/
apiVersion: v1
kind: Service
metadata:
  labels:
    auther: yinzhengjie-svc
  name: svc-xiuxian
spec:
  ports:
  - port: 80
  selector:
    apps: v1
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        name: c1
        ports:
        - containerPort: 80
[root@master231 yinzhengjie]# 

六 全局补丁patchStrategicMerge

1 patchStrategicMerge概述

补丁文件(Patches)可以用来对资源执行不同的定制，kustomize通过patchStrategicMerge和patchesJson6902支持不同的打补丁机制。

patchStrategicMerge的内容是一个文件路径的列表，其中每个文件都可解析为策略性合并补丁(Strategic Merge Patch)。

补丁文件中的名称必须与已经加载资源的名称匹配。建议构造规模较小的，仅做一件事情的补丁。例如，构造一个补丁来增加Deployment的副本个数，构造另外一个补丁来设置内存机制。


推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/patchesstrategicmerge/

2 编写deploy资源清单

[root@master231 yinzhengjie]# mkdir kustomize/deploy/patchStrategicMerge
[root@master231 yinzhengjie]#
[root@master231 yinzhengjie]# cat > kustomize/deploy/patchStrategicMerge/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

3 生成一个patch_replicas.yaml补丁文件

[root@master231 yinzhengjie]# cat > kustomize/deploy/patchStrategicMerge/patch_replicas.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 5
EOF

4 生成另一个补丁patch_resources.yaml补丁文件

[root@master231 yinzhengjie]# cat > kustomize/deploy/patchStrategicMerge/patch_resources.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  template:
    spec:
      containers:
      - name: c1
        resources:
          limits:
            cpu: 0.5
            memoroy: 200Mi
EOF

5 创建kustomization.yaml文件进行打补丁

[root@master231 yinzhengjie]# cat > kustomize/deploy/patchStrategicMerge/kustomization.yaml << 'EOF'
resources:
- deployments.yaml
patchesStrategicMerge:
- patch_replicas.yaml
- patch_resources.yaml
EOF

6 基于kustomize生成模板

[root@master231 yinzhengjie]# ll kustomize/deploy/patchStrategicMerge
total 24
drwxr-xr-x 2 root root 4096 Dec  8 07:41 ./
drwxr-xr-x 5 root root 4096 Dec  8 07:32 ../
-rw-r--r-- 1 root root  353 Dec  8 07:32 deployments.yaml
-rw-r--r-- 1 root root   98 Dec  8 07:41 kustomization.yaml
-rw-r--r-- 1 root root   90 Dec  8 07:35 patch_replicas.yaml
-rw-r--r-- 1 root root  218 Dec  8 07:38 patch_resources.yaml
[root@master231 yinzhengjie]# 
[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/patchStrategicMerge
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 5
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        name: c1
        ports:
        - containerPort: 80
        resources:
          limits:
            cpu: 0.5
            memoroy: 200Mi
[root@master231 yinzhengjie]# 

七 布局补丁patchesJson6902

1 patchesJson6902概述

并非所有资源或者字段都支持策略性合并补丁。为了支持对所有资源的任意字段进行修改，kustomize提供通过patchesJson6902来应用JSON补丁的能力。

为了给JSON补丁找到正确的资源，需要在kustomization.yaml文件中制定资源的组(group)，版本(version)，类别(kind)和名称(name)。

官网链接:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/patchesjson6902/

2 编写deploy资源清单

[root@master231 yinzhengjie]# mkdir kustomize/deploy/patchesJson6902
[root@master231 yinzhengjie]#
[root@master231 yinzhengjie]# cat > kustomize/deploy/patchesJson6902/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

3 创建一个patch_json_replicas.yaml补丁文件

[root@master231 yinzhengjie]# cat > kustomize/deploy/patchesJson6902/patch_json_replicas.yaml <<EOF
- op: replace
  path: /spec/replicas
  value: 10
EOF

4 创建kustomization.yaml文件进行打补丁

[root@master231 yinzhengjie]# cat > kustomize/deploy/patchesJson6902/kustomization.yaml << 'EOF'
resources:
- deployments.yaml
patchesJson6902:
- target:
    group: apps
    version: v1
    kind: Deployment
    name: deploy-xiuxian
  # 使用path字段，基于文件的方式导入
  path: patch_json_replicas.yaml
  # 也可以不导入文件的方式，而知将文件的内容直接写到patch字段中，如下所示。
  #patch: |-
  #  - op: replace
  #    path: /spec/replicas
  #    value: 8
EOF

5 基于kustomize生成模板

[root@master231 yinzhengjie]# ll kustomize/deploy/patchesJson6902/
total 20
drwxr-xr-x 2 root root 4096 Dec  8 08:31 ./
drwxr-xr-x 6 root root 4096 Dec  8 07:49 ../
-rw-r--r-- 1 root root  353 Dec  8 07:49 deployments.yaml
-rw-r--r-- 1 root root  386 Dec  8 08:31 kustomization.yaml
-rw-r--r-- 1 root root   49 Dec  8 08:26 patch_json_replicas.yaml
[root@master231 yinzhengjie]# 
[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/patchesJson6902/
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 10
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        name: c1
        ports:
        - containerPort: 80
[root@master231 yinzhengjie]# 

八.kustomization.yaml的images字段修改镜像

1 image概述

kustomize提供修改容器镜像的能力，支持修改镜像名称(name)，版本号(tags)和摘要信息(digest)，并且不需要创建补丁。

可以通过以下方式更改image:
	name:
		旧的镜像名称。
		
	newName:
		新的镜像名称。
	
	newTag:
		新的镜像的版本号(tags)或者摘要(digest)信息。

推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/images/

2 编写deploy资源清单

[root@master231 yinzhengjie]# mkdir kustomize/deploy/images
[root@master231 yinzhengjie]#
[root@master231 yinzhengjie]# cat > kustomize/deploy/images/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

3 创建kustomization.yaml文件进行动态注入

[root@master231 yinzhengjie]# cat > kustomize/deploy/images/kustomization.yaml << 'EOF'
resources:
- deployments.yaml
images:
- name: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
  newName: harbor.yinzhengjie.com/kubesphere/kubekey
  newTag: v4.1
EOF

4 测试验证

[root@master231 yinzhengjie]# ll kustomize/deploy/images/
total 16
drwxr-xr-x 2 root root 4096 Dec  8 08:56 ./
drwxr-xr-x 7 root root 4096 Dec  8 08:55 ../
-rw-r--r-- 1 root root  353 Dec  8 08:55 deployments.yaml
-rw-r--r-- 1 root root  183 Dec  8 08:56 kustomization.yaml
[root@master231 yinzhengjie]# 
[root@master231 yinzhengjie]# kubectl kustomize kustomize/deploy/images/
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v2
        name: c1
        ports:
        - containerPort: 80
[root@master231 yinzhengjie]# 

八 kustomization.yaml的replicas字段修改副本数

1 replicas概述

kustomize官方提供了更改资源的副本数量。

推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/replicas/

2 编写deploy资源清单

[root@master231 yinzhengjie]# mkdir kustomize/deploy/replicas
[root@master231 yinzhengjie]#
[root@master231 yinzhengjie]# cat > kustomize/deploy/replicas/deployments.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-xiuxian
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: v1
    spec:
      containers:
      - name: c1
        image:  registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
        ports:
        - containerPort: 80
EOF

3 创建kustomization.yaml文件进行动态注入

[root@master231 yinzhengjie]# cat > kustomize/deploy/replicas/kustomization.yaml << 'EOF'
resources:
- deployments.yaml
replicas:
- name: deploy-xiuxian
  count: 5
EOF

九 基于变量注入字段替换名称引用

1 变量注入字段概述

Pod中运行的应用可能需要使用来自其他对象的配置值，例如部署wordpress需要连接MySQL数据库的场景，在使用deployment部署wordpress时，就得在wordpress写上MySQL的svc名称，而svc的名称如果使用了namePrefix或者nameSuffix时svc的名称变化是随机的。

对于上述场景，kustomize可以通过vars将svc名称注入到容器中。


推荐阅读:
	https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/vars/

2 编写MySQL相关的资源清单

	1.创建资源清单目录
[root@master231 yinzhengjie]# mkdir -pv kustomize/case-demo/wordpress
[root@master231 yinzhengjie]#

	2.基于rc部署MySQL服务
[root@master231 yinzhengjie]# cat > kustomize/case-demo/wordpress/replicationcontrollers.yaml <<EOF
apiVersion: v1
kind: ReplicationController
metadata:
  name: rc-db
spec:
  replicas: 1
  selector:
    apps: db
  template:
    spec:
      containers:
      - name: c1
        image: harbor.yinzhengjie.com/yinzhengjie-db/mysql:8.0.36-oracle
        env:
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "yes"
        - name: MYSQL_USER
          value: JieGeJiangYunWei
        - name: MYSQL_PASSWORD
          value: yinzhengjie
        - name: MYSQL_DATABASE
          value: wordpress
    metadata:
      labels:
        apps: db
EOF


	3.基于svc暴露MySQL
[root@master231 yinzhengjie]# cat > kustomize/case-demo/wordpress/svc-db.yaml <<EOF
apiVersion: v1
kind: Service
metadata:
  name: svc-db 
spec:
  type: ClusterIP
  selector:
     apps: db
  ports:
  - port: 3306
    targetPort: 3306
EOF

3 编写wordpress相关的资源清单

	1.基于deploy部署WordPress（注意变量引用）
[root@master231 yinzhengjie]# cat > kustomize/case-demo/wordpress/deployments.yaml << 'EOF'
apiVersion: apps/v1
kind: Deployment
metadata:
  name: deploy-wp
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    spec:
      containers:
      - name: c1
        image: harbor.yinzhengjie.com/yinzhengjie-wp/wordpress:latest
        env:
        - name: WORDPRESS_DB_HOST
          # 注意，此处是我引用的svc变量名称
          value: "$(YINZHENGJIE_SVC_WORDPRESS_DB_HOST)"
        - name: WORDPRESS_DB_USER
          value: JieGeJiangYunWei
        - name: WORDPRESS_DB_PASSWORD
          value: yinzhengjie
        - name: WORDPRESS_DB_NAME
          value: wordpress
    metadata:
      labels:
        apps: wp
EOF


	2.基于svc暴露WordPress服务
[root@master231 yinzhengjie]# cat > kustomize/case-demo/wordpress/svc-wp.yaml <<EOF
apiVersion: v1
kind: Service
metadata:
  name: svc-wp
spec:
  type: NodePort
  selector:
     apps: wp
  ports:
  - port: 80
    targetPort: 80
    nodePort: 30090
EOF

4 创建kustomization.yaml文件编写

[root@master231 yinzhengjie]# cat > kustomize/case-demo/wordpress/kustomization.yaml << 'EOF'
namePrefix: test-
nameSuffix: "-001"
resources:
- deployments.yaml
- replicationcontrollers.yaml
- svc-db.yaml
- svc-wp.yaml
vars:
- name: YINZHENGJIE_SVC_WORDPRESS_DB_HOST
  objref:
    apiVersion: v1
    kind: Service
    name: svc-db
EOF

5 测试验证

[root@master231 yinzhengjie]# kubectl kustomize kustomize/case-demo/wordpress/
apiVersion: v1
kind: Service
metadata:
  name: test-svc-db-001
spec:
  ports:
  - port: 3306
    targetPort: 3306
  selector:
    apps: db
  type: ClusterIP
---
apiVersion: v1
kind: Service
metadata:
  name: test-svc-wp-001
spec:
  ports:
  - nodePort: 30090
    port: 80
    targetPort: 80
  selector:
    apps: wp
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-deploy-wp-001
spec:
  replicas: 3
  selector:
    matchLabels:
      apps: v1
  template:
    metadata:
      labels:
        apps: wp
    spec:
      containers:
      - env:
        - name: WORDPRESS_DB_HOST
          value: test-svc-db-001
        - name: WORDPRESS_DB_USER
          value: JieGeJiangYunWei
        - name: WORDPRESS_DB_PASSWORD
          value: yinzhengjie
        - name: WORDPRESS_DB_NAME
          value: wordpress
        image: harbor.yinzhengjie.com/yinzhengjie-wp/wordpress:latest
        name: c1
---
apiVersion: v1
kind: ReplicationController
metadata:
  name: test-rc-db-001
spec:
  replicas: 1
  selector:
    apps: db
  template:
    metadata:
      labels:
        apps: db
    spec:
      containers:
      - env:
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "yes"
        - name: MYSQL_USER
          value: JieGeJiangYunWei
        - name: MYSQL_PASSWORD
          value: yinzhengjie
        - name: MYSQL_DATABASE
          value: wordpress
        image: harbor.yinzhengjie.com/yinzhengjie-db/mysql:8.0.36-oracle
        name: c1
[root@master231 yinzhengjie]#