One time I accidentally messed with the `\/etc\/passwd` and locked myself out of being able to SSH into the machine. Since this is a remote machine in AWS I had no way of doing what I’d normally do. Which is attaching a keyboard and monitor and fixing this manually.<\/p>\n
To fix, use the AWS EC2 Management page to:
\n– spin up a new instance of vanilla ubuntu EC2 (let’s call it David)
\n– shutdown the locked machine (let’s call it Goliath)
\n– unmount Goliath’s volume
\n– attach the volume to David<\/p>\n
Then follow this guide: https:\/\/docs.aws.amazon.com\/AWSEC2\/latest\/UserGuide\/ebs-using-volumes.html<\/p>\n
Summary of what I did from this guide:
\n“`
\nlsblk
\nsudo file -s \/dev\/xvdf # MBR (not data type)
\nsudo file -s \/dev\/xvdf1 # ext4
\nsudo mkdir mount_folder
\nsudo mount \/dev\/xvdf1 mount_folder # ext4 mounted
\ncd mount_folder
\n# undo crazy setting (see Note #1)
\ncd .. # to unmount
\nsudo umount \/dev\/xvdf1
\n# Note #2
\n“`<\/p>\n
Note #1: For me I tried to modify `\/etc\/ssh\/sshd_config` to allow one more user to login. But this made me unable to login after. So I removed the offending line.<\/p>\n
Note #2: now in the Volume webpage One time I accidentally messed with the `\/etc\/passwd` and locked myself out of being able to SSH into the machine. Since this is a remote machine in AWS I had no way of doing what I’d normally do. Which is attaching a keyboard and monitor and fixing this manually. To fix, use the AWS EC2 … Continue reading How to recover locked out AWS EC2 ssh machine<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-751","post","type-post","status-publish","format-standard","hentry","category-thoughts"],"_links":{"self":[{"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/posts\/751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/comments?post=751"}],"version-history":[{"count":4,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/posts\/751\/revisions"}],"predecessor-version":[{"id":756,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/posts\/751\/revisions\/756"}],"wp:attachment":[{"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/media?parent=751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/categories?post=751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sunapi386.ca\/wordpress\/wp-json\/wp\/v2\/tags?post=751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n– undo attach to David (Volumes tab)
\n– mount to Goliath (Volumes tab: attach as EBS path \/dev\/sda1)<\/strong>
\n– boot up Goliath (Instance tab)<\/p>\n","protected":false},"excerpt":{"rendered":"