Plugins in grafana docker don't appear

Why when i do in grafana docker:

docker run \
   -d \
   -p 5000: 3000 \
   --name = grafana \
   grafana: my_grafana

I see the plugins installed and when i do:

docker run \
   -d \
   -p 5000: 3000 \
   --name = grafana \
    -v /docker/grafana/data: /var/lib/grafana \
   grafana: my_grafana

I don’t see the installed plugins?

I tried to do this too and even then the plugins do not appear:

  docker run \
   -d \
   -p 5000: 3000 \
   --name = grafana \
    -v /docker/grafana/data:/var/lib/grafana \
    -v /docker/grafana/data/plugins:/var/lib/grafana/plugins \
   grafana: my_grafana

Apparently, Grafana plugins are stored in the /var/lib/grafana/plugins in the Docker image grafana:my_grafana, so any volume mount to the container path /var/lib/grafana or /var/lib/grafana/plugins will “overwrite” them with the content from your host FS.

I do :

docker run \
  -d \
  -p 5000:3000 \
  --name=grafana \
   -v /docker/grafana/data:/var/lib/grafana/plugins \
  grafana:my_grafana

But don’t work for me.

Exactly, because your folder /docker/grafana/data doesn’t contain any plugins.
You should follow official doc - http://docs.grafana.org/installation/docker/