I changed my /usr permission of ec2 instance to read only . After that not able to perform any command

Question

I changed my /usr permission to read only . After that not able to perform any command.

Not event able to execute , "clear" or any other operation , nor able to login as sudo . sudo command is not found.

/usr/ now has following permission : dr--------

What can I do to get following permission back : drwxr-xr-x

I am unable to perform any operation like : vi sudo chmod clear

i was trying to update my node version , for which it wanted to create a folder in bin , so I tried changing its permission and this happened. Any idea , how can I perform othrer activities and set my /usr/ permission back to previous ones ? :( Now I can't even "cd" inside /usr/ . — Akshat singh bais, Sep 14, 2021 at 9:02
Create an Ubuntu image on a USB drive. Boot from it. Then mount your / drive and try changing the permissions back. — Ray, Sep 14, 2021 at 9:05
@Ray . This I did on an ec2 instance . How can i do that what you have suggested ? — Akshat singh bais, Sep 14, 2021 at 9:07
If it’s an EC2 instance, you’re out of luck. Terminate and recreate 😕 — matigo, Sep 14, 2021 at 9:10

Rinzwind · Accepted Answer · 2021-09-14 12:00:53Z

0

When you are using instances (google cloud, aws, azure) the method to do this is:

Create a new instance, attach the old instance as a mountpoint, fix your settings on the mount point, and boot into your old instance.

answered Sep 14, 2021 at 12:00

Rinzwind

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Hey @Rinzwind , thanks for you answer , can you please help me with some steps . Didn't understand.
– Akshat singh bais
Sep 14, 2021 at 12:22
That is going to a very long read and I know how to do it in google gce AWS seems similar and AWS has a guide here: docs.aws.amazon.com/AWSEC2/latest/UserGuide/EC2_GetStarted.html But you probably know most of that since you already have an instance(?)
– Rinzwind
Sep 14, 2021 at 13:47

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