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helmfile声明式部署Helm Chart使用详解

公众号: 云原生生态圈 人气:0

说明

使用 helmfile 时,我们首先得了解 helm 的使用,以及如何开发一个 helm chart。helm 是 kubernetes 的包管理工具。在实际的使用场景中我们涉及同时部署多个 chart、区分不同的部署环境、版本控制等需求。基于此需求,可以使用 helmfile 工具。helmfile 通过 helmfile 文件帮助用户管理和维护多个 helm chart,可以来区分环境、实现版本控制。github 链接:helmfile[1]

场景说明

我们在公有云场景或者私有化场景中,同一个产品可能涉及多套环境的配置,例如:每套环境部署依赖的环境差异、使用的数据库、消息队列中间件等实例的地址、账号密码等都不同。因此针对不同环境我们需要维护开发环境、测试环境、预生产环境、生产环境甚至多套环境的部署文件以及秘钥文件,每个小小的改动将涉及多套环境配置的修改,这给运维人员增加了极大的负担,以及多套环境的配置如何保持统一,也极大的考验运维人员的细致程度,极大的增加了运维的复杂度。同时涉及的数据库中间件实例的账户密码的存放,也给运维流程增加了巨大的安全隐患。基于上面的述求,这里可以将业务部署的各服务文件改造成 helm chart,同时区分多套环境以及版本控制,我们使用 helmfile 来统一部署管理。涉及实例涉及的账户密码,我们可以使用 helm secrets 来实现加密解密,以及来保证运维的安全性,从而极大的减少运维的复杂度。关于 helm secrets 的使用,我们在其他文章进行的详细的介绍。

安装

helmfile 提供了多种安装方式,具体可以参考:helmfile release[2]helmfile 还支持运行在容器中,可以很方便的集成到 CICD 的流程中:

# helm 2
$ docker run --rm --net=host -v "${HOME}/.kube:/root/.kube" -v "${HOME}/.helm:/root/.helm" -v "${PWD}:/wd" --workdir /wd quay.io/roboll/helmfile:v0.135.0 helmfile sync
# helm 3
$ docker run --rm --net=host -v "${HOME}/.kube:/root/.kube" -v "${HOME}/.config/helm:/root/.config/helm" -v "${PWD}:/wd" --workdir /wd quay.io/roboll/helmfile:helm3-v0.135.0 helmfile sync

helmfile.yaml 介绍

helmfile.yaml 是 helmfile 的核心文件,其用来声明所有的配置。下面会简要介绍一下,具体说明可以参考官方文档:helmfile-configuration[3]

# 声明 repo 配置
repositories:
- name: <repo-name>
  # url: repo url
  # 可以设置基础配置 或 tls 认证
  # certFile: certificate 文件
  # keyFile: key 文件
  # username: 用户名
  # password: 密码
# helm 二进制文件的路径
helmBinary: path/to/helm3
# helm 的一些默认设置,这些配置与 `helm SUBCOMMAND` 相同,可以通过这个配置声明一些,默认的配置
helmDefaults:
  tillerNamespace: tiller-namespace  #dedicated default key for tiller-namespace
  tillerless: false                  #dedicated default key for tillerless
  kubeContext: kube-context          #dedicated default key for kube-context (--kube-context)
  cleanupOnFail: false               #dedicated default key for helm flag --cleanup-on-fail
  # additional and global args passed to helm (default "")
  args:
    - "--set k=v"
  # verify the chart before upgrading (only works with packaged charts not directories) (default false)
  verify: true
  # wait for k8s resources via --wait. (default false)
  wait: true
  # time in seconds to wait for any individual Kubernetes operation (like Jobs for hooks, and waits on pod/pvc/svc/deployment readiness) (default 300)
  timeout: 600
  # performs pods restart for the resource if applicable (default false)
  recreatePods: true
  # forces resource update through delete/recreate if needed (default false)
  force: false
  # when using helm 3.2+, automatically create release namespaces if they do not exist (default true)
  createNamespace: true
  ...
# 为 helmfile 中所有的 release 设置相同的 label,可用于为所有 release 标记相同的版本
commonLabels:
  hello: world
# 设置 release 配置(支持多 release)
releases:
  # 远程 chart 示例(chart 已经上传到 remote 仓库)
  - name: vault                            # name of this release
    namespace: vault                       # target namespace
    createNamespace: true                  # helm 3.2+ automatically create release namespace (default true)
    labels:                                # Arbitrary key value pairs for filtering releases
      foo: bar
    chart: roboll/vault-secret-manager     # the chart being installed to create this release, referenced by `repository/chart` syntax
    version: ~1.24.1                       # the semver of the chart. range constraint is supported
    condition: vault.enabled               # The values lookup key for filtering releases. Corresponds to the boolean value of `vault.enabled`, where `vault` is an arbitrary value
    missingFileHandler: Warn # set to either "Error" or "Warn". "Error" instructs helmfile to fail when unable to find a values or secrets file. When "Warn", it prints the file and continues.
    # Values files used for rendering the chart
    values:
      # Value files passed via --values
      - vault.yaml
      # Inline values, passed via a temporary values file and --values, so that it doesn't suffer from type issues like --set
      - address: https://vault.example.com
      # Go template available in inline values and values files.
      - image:
          # The end result is more or less YAML. So do `quote` to prevent number-like strings from accidentally parsed into numbers!
          # See https://github.com/roboll/helmfile/issues/608
          tag: {{ requiredEnv "IMAGE_TAG" | quote }}
          # Otherwise:
          #   tag: "{{ requiredEnv "IMAGE_TAG" }}"
          #   tag: !!string {{ requiredEnv "IMAGE_TAG" }}
        db:
          username: {{ requiredEnv "DB_USERNAME" }}
          # value taken from environment variable. Quotes are necessary. Will throw an error if the environment variable is not set. $DB_PASSWORD needs to be set in the calling environment ex: export DB_PASSWORD='password1'
          password: {{ requiredEnv "DB_PASSWORD" }}
        proxy:
          # Interpolate environment variable with a fixed string
          domain: {{ requiredEnv "PLATFORM_ID" }}.my-domain.com
          scheme: {{ env "SCHEME" | default "https" }}
    # Use `values` whenever possible!
    # `set` translates to helm's `--set key=val`, that is known to suffer from type issues like https://github.com/roboll/helmfile/issues/608
    set:
    # single value loaded from a local file, translates to --set-file foo.config=path/to/file
    - name: foo.config
      file: path/to/file
    # set a single array value in an array, translates to --set bar[0]={1,2}
    - name: bar[0]
      values:
      - 1
      - 2
    # set a templated value
    - name: namespace
      value: {{ .Namespace }}
    # will attempt to decrypt it using helm-secrets plugin
  # 本地 chart 示例(chart 保存在本地)
  - name: grafana                            # name of this release
    namespace: another                       # target namespace
    chart: ../my-charts/grafana              # the chart being installed to create this release, referenced by relative path to local helmfile
    values:
    - "../../my-values/grafana/values.yaml"             # Values file (relative path to manifest)
    - ./values/{{ requiredEnv "PLATFORM_ENV" }}/config.yaml # Values file taken from path with environment variable. $PLATFORM_ENV must be set in the calling environment.
    wait: true
# 可以嵌套其他的 helmfiles,支持从本地和远程拉取 helmfile
helmfiles:
- path: path/to/subhelmfile.yaml
  # label 选择器可以过滤需要覆盖的 release
  selectors:
  - name=prometheus
  # 覆盖 value
  values:
  # 使用文件覆盖
  - additional.values.yaml
  # 覆盖单独的 key
  - key1: val1
- # 远程拉取配置
  path: git::https://github.com/cloudposse/helmfiles.git@releases/kiam.yaml?ref=0.40.0
# 如果指向不存在路径,则打印告警错误
missingFileHandler: Error
# 多环境管理
environments:
  # 当没有设置 `--environment NAME` 时,使用 default
  default:
    values:
    # 内容可以是文件路径或者 key:value
    - environments/default/values.yaml
    - myChartVer: 1.0.0-dev
  # "production" 环境,当设置了 `helmfile --environment production sync` 时
  production:
    values:
    - environment/production/values.yaml
    - myChartVer: 1.0.0
    # disable vault release processing
    - vault:
        enabled: false
    ## `secrets.yaml` is decrypted by `helm-secrets` and available via `{{ .Environment.Values.KEY }}`
    secrets:
    - environment/production/secrets.yaml
    # 当占不到 `environments.NAME.values` 时,可以设置为 "Error", "Warn", "Info", "Debug",默认是 "Error"
    missingFileHandler: Error
# 分层管理,可以将所有文件合并,顺序为:environments.yaml < - defaults.yaml < - templates.yaml < - helmfile.yaml
bases:
- environments.yaml
- defaults.yaml
- templates.yaml
# API 功能
apiVersions:
- example/v1

helmfile 调试

这里,编排好相关的 helmfile 后,我们可以使用下面的命令进行调试

# 查看目录结构
$ ls
README.org    environments  helm          helmfile      helmfile.yaml releases
# 查看helmfile.yaml
$ cat helmfile.yaml
environments:
  # 不指定环境时,默认使用默认测试环境
  default:
    values:
       - environments/test/config.yaml
       - environments/test/versions.yaml
       - environments/test//namespaces.yaml
    secrets:
       - environments/test/secrets.yaml
  test:
    values:
      - environments/test/config.yaml
      - environments/test/versions.yaml
      - environments/test/namespaces.yaml
    secrets:
       - environments/test/secrets.yaml
helmDefaults:
  createNamespace: true
releases:
  - name: password-secrets
    kubeContext: {{ .Values.kubeContext.service }}
    namespace: {{ .Values.namespaces.service }}
    chart: helm/charts/secrets
    values:
      - releases/secrets.yaml.gotmpl
    labels:
      app: secrets
  - name: web
    kubeContext: {{ .Values.kubeContext.business }}
    namespace: {{ .Values.namespaces.business }}
    chart: helm/charts/web
    values:
      - releases/web.yaml.gotmpl
    labels:
      app: web
# helmfile调试
$ helmfile -e test template

安装 chart

helmfile -e test sync

helmfile 更新或者删除某个 chart

这里可以通过--selector指定 label 来进行更新或者删除:

# 更新web服务
helmfile -e test --selector app=web sync
# 删除web服务
helmfile -e test --selector app=web delete

查看变更

# 查看文件的变更信息
helmfile -e test --selector app=web diff
# 只查看文件的变更部分信息
helmfile -e test --selector app=web diff --context 4

资料参考

[1]helmfile: https://github.com/roboll/helmfile

[2]helmfile release: https://github.com/roboll/helmfile/releases

[3]helmfile-configuration: https://github.com/roboll/helmfile#configuration

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