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Update docs for mc admin update #3110

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Update docs for mc admin update #3110

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19 changes: 14 additions & 5 deletions docs/minio-admin-complete-guide.md
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Expand Up @@ -289,18 +289,27 @@ Skip SSL certificate verification.

<a name="update"></a>
### Command `update` - updates all MinIO servers
`update` command provides a way to update all MinIO servers in a cluster.

> NOTE:
> - An alias pointing to a distributed setup this command will automatically update all MinIO servers in the cluster.
> - `update` is an disruptive operations for your MinIO service, any on-going API operations will be forcibly canceled. So, it should be used only when you are planning MinIO upgrades for your deployment.
`update` command provides a way to update all MinIO servers in a cluster. You can also use a private mirror server with `update` command to update your MinIO cluster. This is useful in cases where MinIO is running in an environment that doesn't have Internet access.

*Example: Update all MinIO servers.*
```
mc admin update play
Server `play` updated successfully from RELEASE.2019-08-14T20-49-49Z to RELEASE.2019-08-21T19-59-10Z
```

#### Steps to update MinIO using a private mirror
For using `update` command with private mirror server, you need to mirror the directory structure on `https://dl.minio.io/server/minio/release/linux-amd64/` on your private mirror server and then provide:

```
mc admin update myminio https://myfavorite-mirror.com/minio-server/linux-amd64/minio.sha256sum
Server `myminio` updated successfully from RELEASE.2019-08-14T20-49-49Z to RELEASE.2019-08-21T19-59-10Z
```

> NOTE:
> - An alias pointing to a distributed setup this command will automatically update all MinIO servers in the cluster.
> - `update` is a disruptive operation for your MinIO service, any on-going API operations will be forcibly canceled. So, it should be used only when you are planning MinIO upgrades for your deployment.
> - It is recommended to perform a restart after `update` successfully completes.

<a name="service"></a>
### Command `service` - restart and stop all MinIO servers
`service` command provides a way to restart and stop all MinIO servers.
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