System User Accounts
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
e-mail 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.
root:*:0:0:Superuser:/root:/bin/csh
toor:*:0:0:Bourne-again Superuser:/root:
daemon:*:1:1:Owner of many system processes:/root:/sbin/nologin
operator:*:2:5:System ":/:/sbin/nologin
bin:*:3:7:Binaries Commands and Source:/:/sbin/nologin
tty:*:4:65533:Tty Sandbox:/:/sbin/nologin
kmem:*:5:65533:KMem Sandbox:/:/sbin/nologin
games:*:7:13:Games pseudo-user:/usr/games:/sbin/nologin
news:*:8:8:News Subsystem:/:/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
bind:*:53:53:Bind Sandbox:/:/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.
wheel:*:0:root
daemon:*:1:daemon
kmem:*:2:root
sys:*:3:root
tty:*:4:root
operator:*:5:root
mail:*:6:
bin:*:7:
news:*:8:
man:*:9:
games:*:13:
staff:*:20:root
ftp:*:21:
sshd:*:22:
smmsp:*:25:
mailnull:*:26:
guest:*:31:root
bind:*:53:
cyrus:*:60:
www:*:80:
web:*:81:
pop:*:82:
imap:*:83:
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.
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