Silta downscaler

概述

Silta downscaler是一套由两个应用组成的工具集，用于通过基于时间的调度暂停Kubernetes部署来节省资源。

• downscaler.js：cronjob启动的进程，用于选择集群中带有特殊注解的Ingress资源，标记可缩减的部署。当应用被缩减时，Kubernetes服务类型会更改为externalName并指向占位符网站。
• index.js：提供占位符网站，允许被缩减的应用恢复扩展。

该工具仅适用于非生产集群。

支持的版本

• Networking API V1仅在Kubernetes v1.19及以上版本可用。旧版本的downscaler支持旧版Kubernetes。

开发

Downscaler cronjob测试

bash
PLACEHOLDER_SERVICE_NAME=silta-cluster-placeholder-upscaler \
PLACEHOLDER_SERVICE_NAMESPACE=silta-cluster \
PLACEHOLDER_PROXY_IMAGE=wunderio/silta-downscaler:v1-proxy \
DEFAULT_MIN_AGE=1h \
RELEASE_MIN_AGE='{"^(dev|develop|development)":"2w","^(master|main|stage|staging)":"4w","^dependabot":"1h","^production":"10y"}' \
node downscale.js

downscaler.js终端日志示例：

Marked ingress drupal-project-k8s/cli-test-drupal as down
Downscaled deployment drupal-project-k8s/cli-test-drupal from 1 to 0
Downscaled deployment drupal-project-k8s/cli-test-shell from 1 to 0
Suspended cronjob drupal-project-k8s/cli-test-cron-drupal
Downscaled statefulset drupal-project-k8s/cli-test-mariadb from 1 to 0

Placeholder site测试

启动占位符网站：

bash
node index.js

触发恢复扩展请求：

bash
curl -X POST "http://localhost:3000/upscale?domain=cli-test.drupal-project-k8s.[cluster-domain]
# 成功响应：
# {"message":"cli-test-drupal triggered"}

# 重复或错误请求响应
# Not Found

index.js终端日志示例：

node ./index.js
Example app listening on port 3000!
Requesting to scale cli-test-drupal to 1 replica(s)
Requesting to scale cli-test-shell to 1 replica(s)
Requesting to scale cli-test-mariadb to 1 replica(s)
Updated last-update annotation on drupal-project-k8s/cli-test-drupal ingress
Unsuspended cronjob drupal-project-k8s/cli-test-cron-drupal
Upscaled deployment drupal-project-k8s/cli-test-shell from 0 to 1
Upscaled statefulset drupal-project-k8s/cli-test-mariadb from 0 to 1
Upscaled deployment drupal-project-k8s/cli-test-drupal from 0 to 1
drupal-project-k8s/release=cli-test selector resources are ready
drupal-project-k8s/app.kubernetes.io/instance=cli-test selector resources are ready
Reset service drupal-project-k8s/cli-test-drupal to original service
Someone tried to upscale cli-test.drupal-project-k8s.[cluster-domain] via ingress/cli-test-drupal

Docker镜像构建

自动构建

在GitHub中标记新发布版本后，Docker Hub集成将自动构建并发布镜像。

手动构建（仅在自动构建失效时使用）

bash
docker build --tag 'wunderio/silta-downscaler:v1' --tag 'wunderio/silta-downscaler:v1.X' --tag 'wunderio/silta-downscaler:v1.X.Y' .
docker push wunderio/silta-downscaler:v1 
docker push wunderio/silta-downscaler:v1.X
docker push wunderio/silta-downscaler:v1.X.Y

docker build --tag 'wunderio/silta-downscaler:v1-proxy' proxy/
docker push wunderio/silta-downscaler:v1-proxy