Lightsail Django Instance access w/o SSH service running

Question

Hi, thanks for this forum to ask questions.

I foolishly ran sudo service ssh restart after editing my /etc/ssh/sshd_config file on my instance,
and have been struggling to gain access for a day now. Logging in with the browser Lightsail SSH route doesn't work, yields the Upstream_Not_Found error; the instance is "running"; I've attempted a launch script [ sudo service start ssh ; grep -v "-foolish lines I added to sshd file-" > newfile, mv newfile to sshd ] with a snapshot instance of the damaged instance, create the instance, wait 15 minutes, but same error as above.

I'm at a loss -- what can I do to gain access and fix those files?

I've also go through the tutorial provied by AWS for using the Systems Manager (https://repost.aws/knowledge-center/lightsail-resolve-ssh-console-errors) to use Run Command, but can't find my instance listed whenever I try to use it --- help!!!!! thanks!

Answer

Hello.

Did you copy any files before modifying /etc/ssh/sshd_config?  
If you have done so, I think you should write a startup script to restore the configuration file from the copy and restart sshd.  
If you do not have a copy left, try running a startup script that edits the configuration file using a command such as "sed" to restore the configuration file to its original state.

Answer

Have you considered making a snapshot of the instance, and then converting that into an EBS volume so that you can attach to another instance? This would let you view and edit the files, or clone them onto the new instance.

https://awscli.amazonaws.com/v2/documentation/api/latest/reference/lightsail/create-disk-from-snapshot.html

Lightsail Django Instance access w/o SSH service running

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