Merge pull request #33 from epinio/update_s3_documentation

Doc how to configure S3 using Helm

Author: ldevulder

src/howtos/setup-external-s3.md

@@ -4,46 +4,31 @@ One of the steps involved in running `epinio push` is storing the requested vers
 in the configured Epinio S3 compatible storage. By default, Epinio installs and configures [Minio](https://github.com/minio/minio)
 to be used for this purpose. This document describes how to point Epinio to another S3 compatible storage and skip the Minio installation.
 
-The [`epinio install` command](../references/cli/epinio_install.md), has the following optional parameters:
-
-
-```
---s3-endpoint
---s3-access-key-id
---s3-secret-access-key
---s3-bucket
---s3-location
---s3-use-ssl
-```
-
-To configure Epinio to store application sources to an external S3 compatible storage, at least the following should be set:
-
-```
---s3-endpoint
---s3-access-key-id
---s3-secret-access-key
---s3-bucket
-```
-
-the other 2 are optional:
-
-```
---s3-location
---s3-use-ssl
-```
-
+The Epinio Helm chart has the following optional parameters:
+
+|  Variable name | Description | Mandatory |Default |
+|:---|:---|:---:|:---:|
+| `useS3Storage`  | Use S3 storage | yes | "" |
+| `s3Bucket`  | S3 bucket where you want to store your apps | yes | `epinio` |
+| `s3Endpoint`  | S3 endpoint | yes | `minio.minio-epinio.svc.cluster.local` |
+| `s3AccessKeyId`  | S3 access key id to authenticate to the endpoint | yes | "" |
+| `s3SecretAccessKey`  | S3 secret access key id to authenticate to the endpoint| yes | "" |
+| `s3UseSSL`  | Use SSL for encryption | no | `false` |
+| `s3Location`  | S3 region where your bucket is | no | "" |
+
+To configure Epinio to store application sources to an external S3 compatible storage, at least the mandatory options should be set.
 (Some implementations don't need the location (e.g. Minio) and `s3-use-ssl` has a default value of "false")
 
-An example that points Epinio to AWS S3 will look like this:
+For instance, add the following options to your Helm command to make Epinio pointing to AWS:
 
 ```
-epinio install \
---s3-endpoint s3.amazonaws.com \
---s3-access-key-id your_access_key_here \
---s3-secret-access-key your_secret_key_here \
---s3-bucket epinio_sources \
---s3-location eu-central-1
---s3-use-ssl
+--set useS3Storage=true \
+--set s3UseSSL=true \
+--set s3Bucket=<your_bucket_here> \
+--set s3Location=<your_region_here> \
+--set s3Endpoint=s3.amazonaws.com \
+--set s3AccessKeyId=<your_access_key_here> \
+--set s3SecretAccessKey=<your_secret_access_key_here> \
 ```
 
 If the bucket doesn't exist, Epinio will try to create it when it first tries