# Service Management

## Overview

Applications must use service manager daemon to configure services like
phosphor-ipmi-net, bmcweb, obmc-console etc in the system, instead of directly
controlling the same using 'systemd' or 'iptables'. This way client applications
doesn't need to change to configure services, when the implementations differ.
The list of services supported are:

- "bmcweb"
- "obmc-console"`
- "phosphor-ipmi-kcs"
- "phosphor-ipmi-net"
- "start-ipkvm"

## Implementation Details

Service manager daemon will create D-Bus objects for configurable services in
the system under the object path `/xyz/openbmc_project/control/service`. For
each instance of the service there will be a D-Bus object
`/xyz/openbmc_project/control/service/<service-name>`. For example, if there are
two instances of `phosphor-ipmi-net` then there will be two D-Bus objects
`/xyz/openbmc_project/control/service/phosphor_2dipmi_2dnet_40eth0` and
`/xyz/openbmc_project/control/service/phosphor_2dipmi_2dnet_40eth1`. The D-Bus
object manages both the associated service and socket unit files. The D-Bus
object implements the interface
`xyz.openbmc_project.Control.Service.Attributes`. Network services like bmcweb,
phosphor-ipmi-net also implements the
`xyz.openbmc_project.Control.Service.SocketAttributes` interface.

In order to update the property value of a service, `override.conf` file under
`/etc/systemd/system/<Service unit name>/` is updated and the unit is restarted
through `org.freedesktop.systemd1`.

### xyz.openbmc_project.Control.Service.Attributes interface

#### properties

- Enabled - indicates whether the service is enabled or disabled, `true`
  indicates the service will be started on the next boot and `false` indicates
  that service will not be started on the next boot. This property can be used
  to change the service behaviour on the next boot, `true` to start the service
  on the next boot and `false` to not start the service on the next boot. Even
  if the service is disabled, on the next boot it can be started if there are
  other service dependencies to satisfy. The service cannot be enabled if the
  service is masked.

- Masked - indicates whether the service is masked, `true` indicates the service
  is permanently disabled and `false` indicates the service is enabled. If the
  property is set to `true`, then the service is permanently disabled and the
  service is stopped. If the property is set to `false` then the service is
  enabled and starts running.

- Running - indicates the current state of the service, `true` if the service is
  running and `false` if the service is not running. This property can be used
  to change the running state of the service, to start the service set to `true`
  and to stop the service set to `false`. The service cannot be started if the
  service is Masked.

### xyz.openbmc_project.Control.Service.SocketAttributes interface

#### properties

- Port - Port number to which the service is configured to listen, if applicable
  for service. Services like obmc-console will not implement this interface.

## Usage

To permanently disable a service the `Masked` property under the interface
`xyz.openbmc_project.Control.Service.Attributes` needs to be set to `true` and
vice versa to enable a service.

RMCP+ port number can be modified from the default port number 623 to a custom
one by updating the `Port` property value under the interface
`xyz.openbmc_project.Control.Service.SocketAttributes`.