Sudo不工作 - “sudo：有效的uid不是0，sudo是否安装了setuid root？”

Question

I have been trying to allow access to the normal user of an EC2 amazon server ('ec2-user') to a certain library.

I did: "sudo chown -R ec2-user /usr" which I realize now had been a fatal mistake. It worked, but sudo is gone. If I try to use sudo I get: "sudo: effective uid is not 0, is sudo installed setuid root?"

I tried "chmod u+s /usr" like it is suggested in another answer. It does not solve the issue.

I guess that there is something basic I am missing. Forgive my newb ignorance.

Answer 1

The suid bit of the permissions for sudo changes the effective user to the owner of the sudo command file, which you changed to be ec2-user. You need to give ownership of the sudo command back to root.