docs: note helm versions in deployment docs (#553)

deploy/aws/README.md

@@ -20,7 +20,7 @@ Before deploying a TiDB cluster on AWS EKS, make sure the following requirements
   > **Note:** The access key must have at least permissions to: create VPC, create EBS, create EC2 and create role
 * [terraform](https://learn.hashicorp.com/terraform/getting-started/install.html)
 * [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl) >= 1.11
-* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0
+* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0 and < 3.0.0
 * [jq](https://stedolan.github.io/jq/download/)
 * [aws-iam-authenticator](https://docs.aws.amazon.com/eks/latest/userguide/install-aws-iam-authenticator.html) installed in `PATH`, to authenticate with AWS
 

deploy/gcp/README.md

@@ -9,7 +9,7 @@ First of all, make sure the following items are installed on your machine:
 * [Google Cloud SDK](https://cloud.google.com/sdk/install)
 * [terraform](https://www.terraform.io/downloads.html) >= 0.12
 * [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl) >= 1.11
-* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0
+* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0 and < 3.0.0
 * [jq](https://stedolan.github.io/jq/download/)
 
 ## Configure

docs/aws-eks-tutorial.md

@@ -11,7 +11,7 @@ category: operations
 ## Requirements:
 * [awscli](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html) >= 1.16.73
 * [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl) >= 1.11
-* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0
+* [helm](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client) >= 2.9.0 and < 3.0.0
 * [jq](https://stedolan.github.io/jq/download/)
 * [aws-iam-authenticator](https://github.com/kubernetes-sigs/aws-iam-authenticator#4-set-up-kubectl-to-use-authentication-tokens-provided-by-aws-iam-authenticator-for-kubernetes)
 * [terraform](https://www.terraform.io/downloads.html)

docs/local-dind-tutorial.md

@@ -18,7 +18,7 @@ Before deploying a TiDB cluster to Kubernetes, make sure the following requireme
 
     > **Note:** `kubeadm` validates installed Docker version during the installation process. If you are using Docker later than 18.06, there would be warning messages. The cluster might still be working, but it is recommended to use a Docker version between 17.03 and 18.06 for better compatibility. You can find older versions of docker [here](https://download.docker.com/).
 
-- [Helm Client](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client): 2.9.0 or later
+- [Helm Client](https://github.com/helm/helm/blob/master/docs/install.md#installing-the-helm-client): version >= 2.9.0 and < 3.0.0
 - [Kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl): 1.10 at least, 1.13 or later recommended
 
     > **Note:** The outputs of different versions of `kubectl` might be slightly different.

docs/minikube-tutorial.md

@@ -9,7 +9,7 @@ This document describes how to deploy a TiDB cluster in the [minikube](https://k
   * [Install minikube and start a Kubernetes cluster](#install-minikube-and-start-a-kubernetes-cluster)
   * [Install kubectl to access the cluster](#install-kubectl-to-access-the-cluster)
 - [Install TiDB operator and run a TiDB cluster with it](#install-tidb-operator-and-run-a-tidb-cluster-with-it)
-  * [Install helm](#install-helm)
+  * [Install helm](#install-helm) version >= 2.9.0 and < 3.0.0
   * [Install TiDB operator in the Kubernetes cluster](#install-tidb-operator-in-the-kubernetes-cluster)
   * [Launch a TiDB cluster](#launch-a-tidb-cluster)
   * [Test TiDB cluster](#test-tidb-cluster)

docs/setup.md

@@ -8,7 +8,7 @@ Before deploying the TiDB Operator, make sure the following requirements are sat
 * [DNS addons](https://kubernetes.io/docs/tasks/access-application-cluster/configure-dns-cluster/)
 * [PersistentVolume](https://kubernetes.io/docs/concepts/storage/persistent-volumes/)
 * [RBAC](https://kubernetes.io/docs/admin/authorization/rbac) enabled (optional)
-* [Helm](https://helm.sh) v2.8.2 or greater
+* [Helm](https://helm.sh) version >= v2.8.2 and < v3.0.0
 * Kubernetes v1.12 is required for zone-aware persistent volumes.
 
 > **Note:** Allthough TiDB Operator can use network volume to persist TiDB data, this is slower due to redundant replication. It is highly recommended to set up [local volume](https://kubernetes.io/docs/concepts/storage/volumes/#local) for better performance.