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I am new to Linux and I am using Centos7 from AWS and I am slightly confused. To my understanding, in order to use sudo, you need to be in sudoers and by default, the root user and group wheel are in sudoers. I am currently the centos user and I can use sudo, but I can't understand why. I don't believe I am in the group wheel. My sudoer file

And using cat /etc/group, I don't see centos in the group wheel

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  • Also, post (text) example of how you're successfully using sudo ?
    – steve
    Aug 8, 2022 at 21:43
  • Also check /etc/sudoers.d for any included files.
    – user516667
    Aug 8, 2022 at 21:49
  • I've no idea what those images show, other than it seems to be screenshots of text. Please replace them with the actual test so that the information is readable Aug 8, 2022 at 22:14

1 Answer 1

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In cloud environments, many distributions (including CentOS 7) use cloud-init to configure the system when it first boots.

If we look at /etc/cloud/cloud.cfg on the CentOS 7 cloud image, we find:

system_info:
  default_user:
    name: centos
    lock_passwd: true
    gecos: Cloud User
    groups: [wheel, adm, systemd-journal]
    sudo: ["ALL=(ALL) NOPASSWD:ALL"]
    shell: /bin/bash
  distro: rhel
  paths:
    cloud_dir: /var/lib/cloud
    templates_dir: /etc/cloud/templates
  ssh_svcname: sshd

This says, "create a user named centos and apply the sudo configuration ALL=(ALL) NOPASSWD:ALL to that user. This causes cloud-init to create the file /etc/sudoers.d/90-cloud-init-users with the content:

# Created by cloud-init v. 18.2 on Mon, 08 Aug 2022 22:07:23 +0000

# User rules for centos
centos ALL=(ALL) NOPASSWD:ALL

And that is why the centos user has sudo access.

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