生产环境中helm v2升级v3版本遇到的疑难杂症

$ wget https://get.helm.sh/helm-v3.2.3-linux-amd64.tar.gz -O /tmp/helm-v3.2.3-linux-amd64.tar.gz

# 解压
$ tar xf /tmp/helm-v3.2.3-linux-amd64.tar.gz

# 移动
$ cd /tmp/linux-amd64
$ mv helm /usr/local/bin/helm3

$ helm3 plugin install https://github.com/helm/helm-2to3

$ helm3 plugin list

NAME VERSION DESCRIPTION
2to3 0.5.1   migrate and cleanup Helm v2 configuration and releases in-place to Helm v3

$ helm3 2to3 move config

# 检查 repo
$ helm3 repo list

NAME       URL
stable     https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts

# 更新 repo
$ helm3 repo update

Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "stable" chart repository

# 检查 plugin
$ helm3 plugin list

NAME VERSION DESCRIPTION
2to3 0.5.1   migrate and cleanup Helm v2 configuration and releases in-place to Helm v3

$ helm3 2to3 convert --help

migrate Helm v2 release in-place to Helm v3

Usage:
  2to3 convert [flags] RELEASE

Flags:
      --delete-v2-releases         v2 release versions are deleted after migration. By default, the v2 release versions are retained
      --dry-run                    simulate a command
  -h, --help                       help for convert
      --kube-context string        name of the kubeconfig context to use
      --kubeconfig string          path to the kubeconfig file
  -l, --label string               label to select Tiller resources by (default "OWNER=TILLER")
  -s, --release-storage string     v2 release storage type/object. It can be 'secrets' or 'configmaps'. This is only used with the 'tiller-out-cluster' flag (default "secrets")
      --release-versions-max int   limit the maximum number of versions converted per release. Use 0 for no limit (default 10)
  -t, --tiller-ns string           namespace of Tiller (default "kube-system")
      --tiller-out-cluster         when  Tiller is not running in the cluster e.g. Tillerless

$ helm ls

NAME     REVISION    UPDATED                     STATUS      CHART          APP VERSION    NAMESPACE
redis    1           Mon Sep 16 19:46:58 2020    DEPLOYED    redis-9.1.3    5.0.5          default

$ helm3 2to3 convert redis --dry-run

NOTE: This is in dry-run mode, the following actions will not be executed.
Run without --dry-run to take the actions described below:

Release "redis" will be converted from Helm 2 to Helm 3.
[Helm 3] Release "redis" will be created.
[Helm 3] ReleaseVersion "redis.v1" will be created.

$ helm3 2to3 convert redis

Release "redis" will be converted from Helm 2 to Helm 3.
[Helm 3] Release "redis" will be created.
[Helm 3] ReleaseVersion "redis.v1" will be created.
[Helm 3] ReleaseVersion "redis.v1" created.
[Helm 3] Release "redis" created.
Release "redis" was converted successfully from Helm 2 to Helm 3. Note: the v2 releases still remain and should be removed to avoid conflicts with the migrated v3 releases.

# 查看 helm v2 release
$ helm ls

NAME     REVISION    UPDATED                     STATUS      CHART          APP VERSION    NAMESPACE
redis    1           Mon Sep 16 19:46:58 2020    DEPLOYED    redis-9.1.3    5.0.5          default

# 检查 helm v3 release
$ helm3 list -A

NAME   NAMESPACE REVISION UPDATED       STATUS   CHART      APP VERSION
redis   default     1        2020-06-15 18:19:12.409578018 +0800 CST deployed redis-9.1.3 1

  {{- if .Values.route.tls }}
  tls:
  {{ toYaml .Values.route.tls | indent 2 }}
  {{- end -}}

  {{- if .Values.route.tls }}
  tls:
  {{ toYaml .Values.route.tls | indent 2 }}
  {{- end }}

$ helm3 2to3 cleanup --dry-run

2019/11/14 15:06:59 NOTE: This is in dry-run mode, the following actions will not be executed.
2019/11/14 15:06:59 Run without --dry-run to take the actions described below:
2019/11/14 15:06:59
WARNING: "Helm v2 Configuration" "Release Data" "Release Data" will be removed.
This will clean up all releases managed by Helm v2. It will not be possible to restore them if you haven't made a backup of the releases.
Helm v2 may not be usable afterwards.

[Cleanup/confirm] Are you sure you want to cleanup Helm v2 data? [y/N]: y
2019/11/14 15:07:01
Helm v2 data will be cleaned up.
2019/11/14 15:07:01 [Helm 2] Releases will be deleted.
2019/11/14 15:07:01 [Helm 2] ReleaseVersion "postgres.v1" will be deleted.
2019/11/14 15:07:01 [Helm 2] ReleaseVersion "redis.v1" will be deleted.
2019/11/14 15:07:01 [Helm 2] Home folder "/Users/rimasm/.helm" will be deleted.

$ helm3 2to3 cleanup