Kubernetes + Helm-仅在新版本/更改时重新启动Pod

时间:2020-09-04 17:39:57

标签: kubernetes kubernetes-helm

每当我运行基本的deploy命令时,一切都将重新部署到我的环境中。有什么办法告诉Helm仅在进行更改时才应用这些东西,或者这仅仅是它的工作方式?

我正在跑步:

helm upgrade --atomic MyInstall . -f CustomEnvironmentData.yaml

Helm Upgrade documentation中没有看到任何似乎表明该功能的东西。

除非有必要,否则我不想退缩整个环境。

2 个答案:

答案 0 :(得分:3)

无法告诉Helm做到这一点,但也没有必要。如果您向Kubernetes API服务器提交与已经存在的对象完全匹配的对象,通常不会发生任何事情。

例如,假设您有一个Deployment对象,该对象指定image: my/image:{{ .Values.tag }}replicas: 3。您使用tag: 20200904.01提交一次。现在,您运行显示的helm upgrade命令,而tag文件中的CustomEnvironmentData.yaml值保持不变。实际上,这将触发Kubernetes内部的部署控制器。这样可以看到它与图像my/image:20200904.01存在3个容器。这三个吊舱已经存在,所以它什么也不做。

(这与“请勿使用latest标签”建议基本相同:如果您尝试设置image: my/image:latest,并使用此标签重新部署,因为Deployment规范是不变的Kubernetes不会做任何事情,即使注册表中映像的版本已更改。)

答案 1 :(得分:1)

您可能应该使用helm diff upgrade

https://github.com/databus23/helm-diff

$ helm diff upgrade - h
Show a diff explaining what a helm upgrade would change.

    This fetches the currently deployed version of a release
    and compares it to a chart plus values.
    This can be used visualize what changes a helm upgrade will
perform.

    Usage:
diff upgrade[flags] [RELEASE] [CHART]

Examples:
helm diff upgrade my-release stable / postgresql--values values.yaml

Flags:
-h, --help                   help for upgrade
    --detailed - exitcode      return a non - zero exit code when there are changes
--post - renderer string the path to an executable to be used for post rendering. If it exists in $PATH, the binary will be used, otherwise it will try to look for the executable at the given path
--reset - values           reset the values to the ones built into the chart and merge in any new values
    --reuse - values           reuse the last release's values and merge in any new values
    --set stringArray        set values on the command line(can specify multiple or separate values with commas: key1 = val1, key2 = val2)
--suppress stringArray   allows suppression of the values listed in the diff output
    - q, --suppress - secrets       suppress secrets in the output
    - f, --values valueFiles      specify values in a YAML file(can specify multiple)(default[])
    --version string         specify the exact chart version to use.If this is not specified, the latest version is used

    Global Flags:
--no - color   remove colors from the output