@frank-w May I ask why the device’s MAC address changes every time flash new firmware image?
Afaik Mac adress changes on every reboot because the eeprom has no fixed max and uses a random one.
From which interface you are talking about?
This is not too important, I’m just wondering that it doesn’t have a fixed MAC address, I see it happening on all ports. Please advise me, do I need to extend the default memory partition? I want to use more docker i have seen dangowrt talk about this
Imho openwrt is not capable for using docker or other virtualisation. It is a router-os…
But that was one reason i have debian on my routers 
(and easier update kernel vs. Userspace tools).
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Let me ask, why can’t I find the eMMC partition when using lsblk.
I am running OS on SD card and only see the SD card’s partition
This is because mediatek filogic chips only have 1 mmc controller which is switched via hw switch between sdcard and emmc
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We do support docker as well as podman officially in OpenWrt, and we even got our own minimalist container runtime called uxc. Actually a “router OS” turns out to be quite useful as a container host as well 
After all, you may need a complex network setup for the traffic between containers, or containers and the outside world.
And OpenWrt fork prplWrt even went as far as implementing support for CNI as a netifd protocol handler…