Mender OTA study
===

## architechture

server - client


### client

client use yocto project to build image (`.sdimg`)
or
rootfs image(`.ext4`)

#### opreation mode

- command
- deamon

#### partition layout


### server

use minio to store update file (`.mender`)

web ui interface (api gateway)

        |
        |                                            +-------------------------+
        |                                            |                         |
        |                                       +--->|  Device Authentication  |
        |                                       |    |  (mender-device-auth)   |
        |                                       |    +-------------------------+
        |        +-----------------------+      |    |                         |
   port |        |                       |      +--->|  Device Admission       |
    443 | <----> |  API Gateway          |      |    |  (mender-device-adm)    |
        |        |  (mender-api-gateway) |<-----+    +-------------------------+
        |        +-----------------------+      |    |                         |
        |                                       +--->|  Inventory              |
        |                                       |    |  (mender-inventory)     |
        |                                       |    +-------------------------+
        |                                       |    |                         |
        |                                       +--->|  User Administration    |
        |                                       |    |  (mender-useradm)       |
        |                                       |    +-------------------------+
        |                                       +--->|                         |
        |                                            |  Deployments            |
        |              +---------------------------->|  (mender-deployments)   |
        |              |                             +-------------------------+
        |              |
        |              |
        |              v
        |        +------------------+                 +---------+
   port |        |                  |                 |         |
   9000 | <----> |  Storage Proxy   |<--------------->| Minio   |
        |        |  (storage-proxy) |                 | (minio) |
        |        +------------------+                 +---------+
        |

### reference

- [mender document](https://docs.mender.io/)