How to convert Ubuntu to Mikrotik CHR

⚠️ WARNING

This process will completely erase Ubuntu on /dev/sda.

1. Download and unzip the CHR image

 
wget https://download.mikrotik.com/routeros/7.15.3/chr-7.15.3.img.zip
unzip chr-7.15.3.img.zip
 
 

2. Check the disk

 
lsblk
 
Make sure the primary disk is /dev/sda .

3. Remount → read-only

 
echo u > /proc/sysrq-trigger
 
 

4. Write the CHR image to disk (dd)

 
dd if =chr-7.15.3.img of =/dev/sda bs =4M oflag =sync status =progress
 
The entire file size should be written (around 128MB).

5. Forced reboot (mandatory SysRq)

 
sudo sync
sudo reboot -f
 
 

6. Login to CHR

Login:

 
admin
(empty password)
 
 

7. Quick initial setup

 
/user set 0 password =StrongPass123
/interface print
/ip address add address =your server IP/24 interface =ether1
/ip route add gateway = default gateway for your server
/ip dns set servers = 8 .8.8.8,8.8.4.4 allow-remote-requests = no
/ip service disable  ssh
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