The single bay My Cloud devices use a custom Linux OS. It’s why one generally cannot do an apt-get to update modules. Apt-get tends to brick the single bay My Cloud units. If one wants to add their own modules they can attempt to build their own firmware from the firmware GPL files WD has made available for the WD My Cloud unit on the single bay support site.
If you want to run Docker or other OS’s then see the long running thread about using other OS’s on the My Cloud devices.
The first gen v4.x single bay My Cloud is end of life and won’t receive, at least per the following WD Knowledgebase Article, further updates. I suspect the 2nd gen likewise will go End of Life shortly as WD is apparently leaving these units, and others, behind with the release of OS 5. Currently the v2.x single bay My Cloud is listed as “limited updates”.
