Recover Percona Xtradb in container
That container uses volumes (see here), so your data is not inside the container.
To find where it is stored, use docker container inspect YOUR_CONTAINER_NAME, and search for Mounts in the output. If you have jqinstalled you can use something like
$ docker container inspect YOUR_CONTAINER_NAME | jq ".[0].Mounts"Once you found the directory where the data is stored, you should create a backup.
You can then create a new container, with a bind to that directory. Something like
$ docker run -it -v VOLUME_PATH:/var/lib/mysql OTHER_OPTIONS_HERE image_name /bin/shThis should give you a shell where you can execute any commands you may need.
Once you finished, you can delete this container, and hopefully the percona one should now work.