Running a movie on an external DVD drive on a Chromebook (like HP x360)

In a first step this task sounds very easy:

• watch a DVD on a chromebook

But...

What are the problems?

1. Using an external drive to access the dvd
2. No appropriate app available in play store or chrome web store

There are different solutions out there. 

1. Convert the DVD to a mp4 and watch this
2. Use VLC from play store --> does not recognize the DVD
3. Use VLC from chrome web store --> does not start at all
4. Use linux development environment

Option 4 seemed to me as the most promising way to go.

Setting up linux is very easy:

 After that you have a debian bullseye running inside a container. Go to /etc/apt/sources.list and add "contrib" after "deb https://debian.org/debian bullseye main " ("sudo bash" to get root). Then 

apt update
apt upgrade
apt install vlc libdvd-pkg
dpkg-reconfigure libdvd-pkg

After that vlc is configured including the libdvdcss for the DVD region codes.

One last problem is to access the DVD inside this linux container. This can be done via a double tap inside the file-manager on the chromebook and then you can choose inside the context menu "share with linux (Mit Linux teilen)".

This last step has to be done each time a DVD is inserted. 

So watching DVDs on a chromebook is not impossible, but it is not really user friendly...

influxdb: copying data with SELECT INTO - pay attention to the TAGS (or they are transformed to fields)

 If you are using influxdb, one usecase could be, copy the data from a measurement ("table") to another.

This can be done with this statement:

select * into testtable2 from testtable1

By the way: the CLI is opened with

/usr/bin/influx -unsafeSsl -ssl -database telegraf

(if your database is named telegraf)

In my case (zigbee / mqtt / telegraf) the layout of mqtt_consumer measurement was like this:

> show tag keys from mqtt_consumer
name: mqtt_consumer
tagKey
------
host
topic
> show field keys from mqtt_consumer
name: mqtt_consumer
fieldKey    fieldType
--------    ---------
battery     float
contact     boolean
current     float
...

But after copying this to a testtable, the tags where gone and everything was a field. 

This is not a big problem - you can work with that data without a problem. BUT if you want to copy it back or merge it to the original table, you will get a table with the additional columns host_1 and topic_1.

This is because for influx you already had a column host. So it added a column field host_1. 

If a query in this new table (with host + host_1) spans over a time where both of this columns are in, you only select the data, with the entry host. If the time spans only entries with host_1, it is shown as host and you get your data. Really a unpredictable way to get data.

What is the solution? Easy:

select * into table1 from mqtt_consumer group by host,topic

The "group by" does not group anything. It just tells influx: host & topic are tags and not fields. Please do not transform them...