Any recover from sudo chmod 600 / [duplicate]

Question

I was configuring ssl certificate on server and while following documentation I accidentally pasted terminal command without checking.

sudo chmod 600 / usr/local/nginx/ssl/my-ssl.key

It immediately kicked me out of the server because I guess this result in changing permissions of ubuntu root folder. What can I do?

EDIT: I used chmod not chown command

Answer 1

In case sudo does not work this needs to be done from a live session.

If this is a cloud instance you need to go to the cloud console, create a new instance, mount your disk in the new instance and then fix it on the mountpoint. After that re-attach the disk to boot from it.

Everything in / except for mountpoints is set to root so this will revert your command:

sudo chown root / 

Then do a

sudo chown $USER {mountpoints}

for every mountpoint you have.

---

edit: When using chmod:

sudo chmod 777 /lib*/ /tmp/ /sbin/ /bin/
sudo chmod 770 /cdrom/ 
sudo chmod 750 /usr/ /sys/ /srv/ /snap/ /run/ /proc/ /opt/ /mnt/ 
sudo chmod 750 /media/ /home/ /etc/ /dev/ /boot/ 
sudo chmod 700 /root/ /lost+found/
sudo chmod 600 /swapfile

In case I missed anything this it what it should look like:

drwxr-xr-x  14 root     root           4096 mrt 30  2022 usr
drwxr-xr-x   2 root     root           4096 mrt 30  2022 srv
drwxr-xr-x   2 root     root           4096 mrt 30  2022 mnt
drwxr-xr-x  14 root     root           4096 mrt 30  2022 var
drwx------   2 root     root          16384 apr  3  2022 lost+found
-rw-------   1 root     root     1942548480 apr  3  2022 swapfile
lrwxrwxrwx   1 root     root              8 apr  3  2022 sbin -> usr/sbin
lrwxrwxrwx   1 root     root             10 apr  3  2022 libx32 -> usr/libx32
lrwxrwxrwx   1 root     root              9 apr  3  2022 lib64 -> usr/lib64
lrwxrwxrwx   1 root     root              9 apr  3  2022 lib32 -> usr/lib32
lrwxrwxrwx   1 root     root              7 apr  3  2022 lib -> usr/lib
lrwxrwxrwx   1 root     root              7 apr  3  2022 bin -> usr/bin
drwxrwxr-x   2 root     root           4096 apr  3  2022 cdrom
drwxr-xr-x   3 root     root           4096 apr  3  2022 home
drwxr-xr-x   3 root     root           4096 apr  8 20:29 media
drwxr-xr-x  14 root     root           4096 apr 18 08:35 snap
drwx------   7 root     root           4096 jul 18 20:33 root
drwxr-xr-x   4 root     root           4096 sep 21 06:36 boot
dr-xr-xr-x  13 root     root              0 okt  3 23:23 sys
dr-xr-xr-x 378 root     root              0 okt  3 23:23 proc
drwxr-xr-x  36 root     root            960 okt  4 17:29 run
drwxr-xr-x 143 root     root          12288 okt  4 17:30 etc
drwxr-xr-x   6 root     root           4096 okt  4 17:53 opt
drwxr-xr-x  19 root     root           4800 okt  4 18:49 dev
drwxrwxrwt  35 root     root           4096 okt  4 23:24 tmp

edit:

And you also need to do

sudo chmod 600 /usr/local/nginx/ssl/my-ssl.key

;)