Mender

IMAGE GALLERY (1)

Remove the jumper from CMOS clock or the entire battery, press and hold power button for sometime 20 sec to discharge.

Note: the difference between ‘zImage’ files and ‘bzImage’ files is that ‘bzImage’ uses a different layout and a different loading algorithm, and thus has a larger capacity. Both files use gzip compression. The ‘bz’ in ‘bzImage’ stands for ‘big zImage’, not for ‘bzip’!

• System partition and boot partition

• Is a /boot partition always necessary?

  scp -v skysails-mastercontrol-image-genericx86-64.mender root@192.168.122.36:/data
  /etc/fstab
  /etc/mender/artifact_ingo
  /sbin/init.sh
  fw_printenv
  
  mender -rootfs /data/skysails-mastercontrol-image-genericx86-64.mender
  
  ................................  96% 139264 KiB
  ................................  97% 140288 KiB
  ................................  97% 141312 KiB
  ................................  98% 142336 KiB
  ................................  99% 143360 KiB
  ..........................INFO[0051] wrote 1072693248/1072693248 bytes of update to device /dev/sda3  module=device
  .      100% 144224 KiB
  INFO[0053] Enabling partition with new image installed to be a boot candidate: 3  module=device
  

After reboot

root@genericx86-64:~# lsblk --fs
NAME   FSTYPE LABEL    UUID                                 MOUNTPOINT
sda
|-sda1 vfat   efi      A5F1-6F37                            /boot/efi
|-sda2 ext4   rootfs_0 909242fd-11b5-4f29-a94f-44a3b8790faa
|-sda3 ext4            e5a42c52-6bef-43c4-824a-5ea3ef4d817a /
|-sda4
|-sda5 ext4   config   93831baf-6c60-4883-96e0-3d6e78a55c8d
`-sda6 ext4   data     6c4ce979-e364-4315-a346-9b9662f87c6f /data

Reboot again and / will change to sda2

root@genericx86-64:~# fw_printenv
bootcount=1
mender_boot_part=3
upgrade_available=1
mender_boot_part_hex=3

#REBOOT

root@genericx86-64:~# fw_printenv
bootcount=0
mender_boot_part=2
upgrade_available=0
mender_boot_part_hex=3

After upgrade, .mender file is lost

Footnotes

[1]: What is the difference between the following kernel Makefile terms: vmLinux, vmlinuz, vmlinux.bin, zimage & bzimage? [2]: Roderick W. Smith -linux expert