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04-Limit-Node-Access.md

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Limit Node Access

In this section, we will take a look at Limit Node Access.

The Four types of user accounts in linux

  • The user account refers to individuals who need access to the Linux system.

  • A super user account is the root, which has UID 0.

  • System accounts are typically created during the OS installation.

  • Service accounts are similar to system accounts and created when services are installed in linux. Such as an nginx service that makes use of a service account called nginx.

Access control files in Linux

  • Most of the access control files in Linux are stored under the /etc directory.

  • The first one of interest is the /etc/passwd file which is also commonly known as the password file. This file contains basic information about the users in the system, including the username,UID/GID, home directory and their default shell.

  • The passwords are stored in the next file and we are going to see /etc/shadow file. The contents of this file are hashed.

  • The /etc/group file stores information about all user groups on the system such as the group name and GID and members.