Kubernetes集群中怎么利用CRD实现分批发布
这篇文章给大家介绍Kubernetes集群中怎么利用CRD 实现分批发布，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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使用kubectl进行分批发布
新集群默认安装了alicloud-application-controller，老集群请先手动安装，安装方式，kubectl create -f alicloud-application-controller.yml
apiVersion: extensions/v1beta1 kind: Deploymentmetadata: name: alicloud-application-controller labels: owner: aliyun app: alicloud-application-controller namespace: kube-systemspec: replicas: 1 selector: matchLabels: owner: aliyun app: alicloud-application-controller template: metadata: labels: owner: aliyun app: alicloud-application-controller annotations: scheduler.alpha.kubernetes.io/critical-pod: '' spec: tolerations: - effect: NoSchedule operator: Exists key: node-role.kubernetes.io/master - effect: NoSchedule operator: Exists key: node.cloudprovider.kubernetes.io/uninitialized containers: - name: alicloud-application-controller image: registry.cn-hangzhou.aliyuncs.com/acs/aliyun-app-lifecycle-manager:0.1-93095ba imagePullPolicy: IfNotPresent serviceAccount: admin
我们这里以下面这个StatefulSet为例子演示分批发布的流程，
apiVersion: apps/v1 kind: StatefulSetmetadata: name: webspec: selector: matchLabels: app: nginx # has to match .spec.template.metadata.labels serviceName: "nginx" replicas: 3 # by default is 1 template: metadata: labels: app: nginx # has to match .spec.selector.matchLabels spec: terminationGracePeriodSeconds: 10 containers: - name: nginx image: registry.cn-hangzhou.aliyuncs.com/xianlu/old-nginx ports: - containerPort: 80 name: web
这是一个含有三个实例的nginx 实例，为了暴露此容器，我们使用Service来暴露，Service的Yaml如下
apiVersion: v1 kind: Servicemetadata: name: nginx labels: app: nginxspec: ports: - port: 80 name: web selector: app: nginx type: LoadBalancer
这里通过SLB 暴露nginx 服务。
为了保证用户的Yaml安全性，分批发布需要使用Secret来存储最终的yaml，这里需要将yaml执行一下base64操作，再存储。
这个是StatefulSet的Secret Yaml
apiVersion: v1 kind: Secretmetadata: name: mysts type: Opaquedata: yaml: 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
下面的为Service的Secret Yaml
apiVersion: v1 kind: Secretmetadata: name: mysvc type: Opaquedata: yaml: YXBpVmVyc2lvbjogdjEKa2luZDogU2VydmljZQptZXRhZGF0YToKICBuYW1lOiBuZ2lueAogIGxhYmVsczoKICAgIGFwcDogbmdpbngKc3BlYzoKICBwb3J0czoKICAtIHBvcnQ6IDgwCiAgICBuYW1lOiB3ZWIKICBzZWxlY3RvcjoKICAgIGFwcDogbmdpbngKICB0eXBlOiBMb2FkQmFsYW5jZXI=
分别将上面的两个Secret 创建出来，kubectl create -f xxxxx
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可以看到两个Secret都已经创建完毕，下面就可以来创建分批发布的 CRD。分批发布的 CRD 格式如下，
apiVersion: alicloud.com/v1beta1 kind: BatchReleasemetadata: name: example-batch-release annotations: aliyun.batchnum: "2"spec: statefulSetSecretName: mysts serviceSecretName: mysvc
�aliyun.batchnum: 代表分几批发布，目前默认是2批statefulSetSecretName: 表示存储StatefulSet的Secret 名称serviceSecretName: 表示存储Service的Secret 名称
使用kubectl create -f xxx 创建此CRD分批发布
可以看到，描述资源都已经创建出来了。
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get stsNAME DESIRED CURRENT AGE web 3 3 6m [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get pods -o=wideNAME READY STATUS RESTARTS AGE IP NODE web-0 1/1 Running 0 7m 172.16.2.2 cn-hangzhou.i-bp199b7a244chaux4ozh web-1 1/1 Running 0 6m 172.16.2.131 cn-hangzhou.i-bp199b7a244chaux4ozi web-2 1/1 Running 0 6m 172.16.1.136 cn-hangzhou.i-bp199b7a244chaux4ozg [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get svcNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 172.19.0.1443/TCP 4h nginx LoadBalancer 172.19.12.163 120.55.148.238 80:32065/TCP 7m [root@iZbp11x2k7by5gfy6pkrl1Z ~]# curl 120.55.148.238old
可以看到，nginx 的StatefulSet和对应的Service 都已经创建出来，并且curl 是可以直接访问。
下面我们开始分批发布一个新版本的StatefulSet，这里我们新的StatefulSet Yaml 模板如下
apiVersion: apps/v1 kind: StatefulSet metadata: name: web spec: selector: matchLabels: app: nginx # has to match .spec.template.metadata.labels serviceName: "nginx" replicas: 3 # by default is 1 template: metadata: labels: app: nginx # has to match .spec.selector.matchLabels spec: terminationGracePeriodSeconds: 10 containers: - name: nginx image: registry.cn-hangzhou.aliyuncs.com/xianlu/new-nginx ports: - containerPort: 80 name: web
可以看到，新老StatefulSet的区别在于，更换了新版本的镜像。
同样，我们需要创建一个Secret 来存储这个新的StatefulSet
apiVersion: v1 kind: Secretmetadata: name: my-new-sts type: Opaquedata: yaml: YXBpVmVyc2lvbjogYXBwcy92MQpraW5kOiBTdGF0ZWZ1bFNldAptZXRhZGF0YToKICBuYW1lOiB3ZWIKc3BlYzoKICBzZWxlY3RvcjoKICAgIG1hdGNoTGFiZWxzOgogICAgICBhcHA6IG5naW54ICMgaGFzIHRvIG1hdGNoIC5zcGVjLnRlbXBsYXRlLm1ldGFkYXRhLmxhYmVscwogIHNlcnZpY2VOYW1lOiAibmdpbngiCiAgcmVwbGljYXM6IDMgIyBieSBkZWZhdWx0IGlzIDEKICB0ZW1wbGF0ZToKICAgIG1ldGFkYXRhOgogICAgICBsYWJlbHM6CiAgICAgICAgYXBwOiBuZ2lueCAjIGhhcyB0byBtYXRjaCAuc3BlYy5zZWxlY3Rvci5tYXRjaExhYmVscwogICAgc3BlYzoKICAgICAgdGVybWluYXRpb25HcmFjZVBlcmlvZFNlY29uZHM6IDEwCiAgICAgIGNvbnRhaW5lcnM6CiAgICAgIC0gbmFtZTogbmdpbngKICAgICAgICBpbWFnZTogcmVnaXN0cnkuY24taGFuZ3pob3UuYWxpeXVuY3MuY29tL3hpYW5sdS9uZXctbmdpbngKICAgICAgICBwb3J0czoKICAgICAgICAtIGNvbnRhaW5lclBvcnQ6IDgwCiAgICAgICAgICBuYW1lOiB3ZWI=
然后我们更新刚才创建的 CRD，将statefulSetSecretName改成新的StatefulSet名称。
修改后的CRD Yaml 如下:
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get BatchRelease example-batch-release -o=yaml apiVersion: alicloud.com/v1beta1 kind: BatchRelease metadata: annotations: aliyun.batchnum: "2" clusterName: "" creationTimestamp: 2018-07-31T08:17:17Z generation: 1 name: example-batch-release namespace: default resourceVersion: "43484" selfLink: /apis/alicloud.com/v1beta1/namespaces/default/batchreleases/example-batch-release uid: 2386ddfd-949a-11e8-a3c2-00163e086528spec: serviceSecretName: mysvc statefulSetSecretName: my-new-sts
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl describe BatchRelease example-batch-releaseName: example-batch-release Namespace: default Labels:Annotations: aliyun.batchnum=2API Version: alicloud.com/v1beta1 Kind: BatchRelease Metadata: Cluster Name: Creation Timestamp: 2018-07-31T08:17:17Z Generation: 1 Resource Version: 43484 Self Link: /apis/alicloud.com/v1beta1/namespaces/default/batchreleases/example-batch-release UID: 2386ddfd-949a-11e8-a3c2-00163e086528 Spec: Service Secret Name: mysvc Stateful Set Secret Name: my-new-sts Status: Control: Release: Batch _ Order: 1 Progress: finished Status: WaitingForConfirm Resources: Service: Name: nginx Namespace: default Status: Updating Stateful Set: Name: web Namespace: default Status: Updating Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal CreateSubResource 2m aliyun-controller Create StatefulSet resource sucessfully Normal CreateSubResource 2m aliyun-controller Create service resource sucessfully Normal Synced 2m aliyun-controller Batch CRD synced successfully Normal UpdateResource 1m aliyun-controller Begin to update StatefulSet web with partition 2 Normal UpdateResource 1m aliyun-controller Waiting StatefulSet default:web ready, readyReplicas 2 replicas 3 times 1 Normal UpdateResource 1m aliyun-controller Waiting StatefulSet default:web ready, readyReplicas 2 replicas 3 times 2 Normal UpdateResource 1m aliyun-controller Begin to update service with new selector map[app:nginx aliyun.version:2] Normal UpdateResource 1m aliyun-controller Update StatefulSet and Service sucessfully, waiting confirm [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get pods -o=wideNAME READY STATUS RESTARTS AGE IP NODE web-0 1/1 Running 0 2m 172.16.2.132 cn-hangzhou.i-bp199b7a244chaux4ozi web-1 1/1 Running 0 2m 172.16.2.3 cn-hangzhou.i-bp199b7a244chaux4ozh web-2 1/1 Running 0 1m 172.16.1.138 cn-hangzhou.i-bp199b7a244chaux4ozg [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get svcNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 172.19.0.1 443/TCP 5h nginx LoadBalancer 172.19.2.184 101.37.107.187 80:32173/TCP 2m[root@iZbp11x2k7by5gfy6pkrl1Z ~]# curl 101.37.107.187new [root@iZbp11x2k7by5gfy6pkrl1Z ~]#
我们可以通过event 看到 CRD 的所有事件。同时可以看到，nginx的3个pod，已经有一个 pod发生了改变，变成了最新镜像，同时 curl对应的service，会发现流量已经指向了新的pod。这样用户就可以快速试错了。
下面我们来演示如何快速回滚，如果流量打到新的 pod后发现有问题，需要回滚，那么我们需要编辑CRD,
将Status 的action 置为rollback 就可以快速回滚。
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl edit BatchRelease example-batch-releasebatchrelease.alicloud.com "example-batch-release" edited [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get pods -o=wideNAME READY STATUS RESTARTS AGE IP NODE web-0 1/1 Running 0 7m 172.16.2.132 cn-hangzhou.i-bp199b7a244chaux4ozi web-1 1/1 Running 0 7m 172.16.2.3 cn-hangzhou.i-bp199b7a244chaux4ozh web-2 1/1 Running 0 3s 172.16.1.139 cn-hangzhou.i-bp199b7a244chaux4ozg [root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get svcNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 172.19.0.1443/TCP 5h nginx LoadBalancer 172.19.2.184 101.37.107.187 80:32173/TCP 7m [root@iZbp11x2k7by5gfy6pkrl1Z ~]# curl 101.37.107.187old
可以看到原来web-2所在的pod已经被回滚到了老镜像，现在curl service 也都是老的服务了。
发布第二批
发布第二批需要在action 置为continue 就可以
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get pods -o=wide
NAME READY STATUS RESTARTS AGE IP NODE
web-0 1/1 Running 0 3s 172.16.2.138 cn-hangzhou.i-bp199b7a244chaux4ozi
web-1 1/1 Running 0 13s 172.16.2.12 cn-hangzhou.i-bp199b7a244chaux4ozh
web-2 1/1 Running 0 2m 172.16.1.153 cn-hangzhou.i-bp199b7a244chaux4ozg
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get BatchRelease example-batch-release -o=yaml
apiVersion: alicloud.com/v1beta1
kind: BatchRelease
metadata:
annotations:
aliyun.batchnum: "2"
clusterName: ""
creationTimestamp: 2018-07-31T09:44:58Z
generation: 1
name: example-batch-release namespace: default
resourceVersion: "58066"
selfLink: /apis/alicloud.com/v1beta1/namespaces/default/batchreleases/example-batch-release
uid: 6321dcaf-94a6-11e8-a3c2-00163e086528spec:
serviceSecretName: mysvc
statefulSetSecretName: my-new-sts
status:
control: {}
release:
batch_order: "2"
progress: finished
status: WaitingForConfirm
resources:
Service:
name: nginx namespace: default
status: Updating
StatefulSet:
name: web namespace: default
status: Updating可以看到StatefulSet的三个 pod都被更新了。
这个时候就可以确认发布了
置为confirm 就确定了这次发布。
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get BatchRelease example-batch-release -o=yaml
apiVersion: alicloud.com/v1beta1
kind: BatchRelease
metadata:
annotations:
aliyun.batchnum: "2"
clusterName: ""
creationTimestamp: 2018-07-31T09:44:58Z
generation: 1
name: example-batch-release namespace: default
resourceVersion: "58542"
selfLink: /apis/alicloud.com/v1beta1/namespaces/default/batchreleases/example-batch-release
uid: 6321dcaf-94a6-11e8-a3c2-00163e086528spec:
serviceSecretName: mysvc
statefulSetSecretName: my-new-sts
status:
control: {}
release:
progress: finished
status: Success
resources:
Service:
name: nginx namespace: default
status: Success
StatefulSet:
name: web namespace: default
status: Success
[root@iZbp11x2k7by5gfy6pkrl1Z ~]# kubectl get secret -l owner=aliyun -n=kube-system
NAME TYPE DATA AGE
example-batch-release.v1 Opaque 4 18m
example-batch-release.v2 Opaque 4 56s关于Kubernetes集群中怎么利用CRD 实现分批发布就分享到这里了，希望以上内容可以对大家有一定的帮助，可以学到更多知识。如果觉得文章不错，可以把它分享出去让更多的人看到。
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