Hello, I have build a monitoring system which is "portable" and based on OpenWrt (and docker for the monitoring part of app) and a raspberry pi 3. Why OpenWrt ? Because it is very convenient for managing the network access (WiFi + ethernet + 4G dongle + VPN) and also for the easy upgrade process. …

[image] orfait: @erdoukki : rootfs overlay is new for me. Can you explain more what you did and how ? Thank you both for answering such a specific request. The wiki has recently changed, but it looks like here are some stuff : https://openwrt.org/docs/guide-user/additional-software/extroot_c…

[image] orfait: Is there any better solution or any advise for my use case ? you may use a rootfs overlay... Your main rootfs will stay ro (and mount as /rom)... You will have a modifiable system, crashless, and with original rootfs as rom (ReadOnly)... May need some tweak to fit your need…

@frollic : /etc/fstab is empty by default. So, when I added the ro flag in cmdline, I also tried fstab 2 times. First with : /dev/mmcblk0p2 / ext4 ro,noatime 0 1 Then with /dev/root / ext4 ro,noatime 0 1 because /proc/mounts show /dev/root : /dev/root / ext4 rw,noatime 0 0 @erdoukki : rootfs …

can you in dmesg see something like this, containing the added ro param Bootloader command line (ignored): console=ttyHSL1,115200n8 root=mtd:rootfs rootfstype=squashfs

[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyAMA0,115200 console=tty1 root=/dev/mmc…

Thank you, this is a great option and I will give a try. But as long as I don't need to modify the rootfs (custom build preconfigured), I will still hear from @frollic for a real readonly rootfs.

Hi there. When I started this topic, I have updated my build with 21.02 r16278 (the ext4 failure happened with rc2). Then I tested it with a powerplug which integrate a contactor with a "random" cycle. It was working for more than 2 weeks without any problem and using ext4. So : is there any cha…

Finally went for your solution, thank you for your help.

advice on the updates of my recommendations here : Request for Best Practice for eMMC devices !

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Put rootfs in readonly

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erdoukki September 1, 2021, 3:08pm 11

Raspberry Pi 4 B extroot configuration Installing and Using OpenWrt

I prefer personaly use an ext4 system and extend the eMMC (or uSD) with an additional partition where I copy the system root (and mount as / for extroot)... Then fstab (block-mount ipk) take care of any crash and check fs with the option : config 'global' ... option check_fs '1' ... config 'mount' option target '/' option uuid 'replace with correct uuid found it with blkid command' option enabled '1' option enabled_fsck '1' It is a 24/24…

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