Your Virtual Private Server was configured with several user accounts and user groups that exist to allow specific
programs to run. Because these users and groups are used by the system, it is important that you do not make changes
to them unless you know what the results of your changes will do.
In order to avoid confusion, we have made the vlistuser command. This command will list only the
user accounts you have created, along with disk quota use and the home directory for these users. Any of the system
users will not be listed.
The first system user is root. Other important users
to be aware of are www, which is the user your Web server runs as, pop, smmsp, and mailnull,
which are for your email server, ftp for FTP, and sshd, for SSH.
The following is an example of a default /etc/passwd file. Your server will not function properly without
at least these users.
daemon:*:1:1:Owner of many system processes:/root:/sbin/nologin
bin:*:3:7:Binaries Commands and Source:/:/sbin/nologin
man:*:9:9:Mister Man Pages:/usr/share/man:/sbin/nologin
ftp:*:21:21:Anonymous FTP User:/ftp:/sbin/nologin
sshd:*:22:22:Secure Shell Daemon:/var/empty:/sbin/nologin
smmsp:*:25:25:Sendmail Submission User:/var/spool/clientmqueue:/sbin/nologin
mailnull:*:26:26:Sendmail Default User:/var/spool/mqueue:/sbin/nologin
cyrus:*:60:60:the cyrus mail server:/nonexistent:/sbin/nologin
pop:*:68:6:Post Office Owner:/nonexistent:/sbin/nologin
www:*:80:80:World Wide Web Owner:/nonexistent:/sbin/nologin
Many of the system users also have their own groups. Most of these groups do not need any additional
users in them. Some groups, however, require a user to be a member of in order to use the services. For more details
on groups that require membership for access to services, see
User Permissions. The following is an example of an
original /etc/group file on a new Virtual Private Server. As with users, you need to have at least these
groups for your server to function properly.
If you have any questions about the purpose of any of these users or groups, please
Ask our Support Staff or refer to a UNIX manual.