zlogin(1)                                                          User Commands                                                         zlogin(1)

NAME

       zlogin - enter a zone

SYNOPSIS

       zlogin [-CE] [-e c] [-l username] zonename

       zlogin [-ES] [-e c] [-l username] zonename utility [argument...]

DESCRIPTION

       The zlogin utility is used by the administrator to enter an operating system zone. Only a superuser operating in the global system zone can
       use this utility.

       zlogin operates in one of three modes:

       Interactive Mode

           If no utility argument is given and the stdin file descriptor for the zlogin process is a tty device, zlogin  operates  in  interactive
           mode.  In  this mode, zlogin creates a new pseudo terminal for use within the login session. Programs requiring a tty device, for exam-
           ple, vi(1), work properly in this mode. In this mode, zlogin invokes login(1) to provide a suitable login session.

       Non-Interactive Mode

           If a utility is specified, zlogin operates in non-interactive mode. This mode can be useful for script authors since stdin, stdout, and
           stderr  are  preserved and the exit status of utility is returned upon termination. In this mode, zlogin invokes su(1M) in order to set
           up the user's environment and to provide a login environment.

       Console Mode

           If the -C option is specified, the user is connected to the zone console device and zlogin operates in console mode. The  zone  console
           is available once the zone is in the installed  state. Connections to the console are persistent across reboot of the zone.

OPTIONS

       The following options are supported:

       -C              Connects to the zone console.

       -e c            Specifies  a  different  escape character, c, for the key sequence used to access extended functions and to disconnect from
                       the login. The default escape character is the tilde (~).

       -E              Disables the ability to access extended functions or to disconnect from the login by using the escape sequence character.

       -l username     Specifies a different username for the zone login. If you do not use this option, the zone username used  is  "root".  This
                       option is invalid if the -C option is specified.

       -S              "Safe"  login mode. zlogin does minimal processing and does not invoke login(1) or su(1M). The -S option can not be used if
                       a username is specified through the -l option, and cannot be used with console logins. This mode should  only  be  used  to
                       recover a damaged zone when other forms of login have become impossible.

   Escape Sequences
       Lines  that  you  type  that  start  with  the tilde character (~) are "escape sequences". The escape character can be changed using the -e
       option.

       ~.       Disconnects from the zone. This is not the same as a logout, because the local host breaks the connection with no warning  to  the
                zone's end.

SECURITY

       Once a process has been placed in a zone other than the global zone, the process cannot change zone again, nor can any of its children.

OPERANDS

       The following operands are supported:

       zonename        The name of the zone to be entered.

       utility         The utility to be run in the specified zone.

       argument...     Arguments passed to the utility.

EXIT STATUS

       In  interactive and non-interactive modes, the zlogin utility exits when the command or shell in the non-global zone exits. In non-interac-
       tive mode, the exit status of the remote program is returned as the exit status of zlogin. In interactive mode and console login mode,  the
       exit status is not returned. zlogin returns a 0 exit status as long as no connection-related error occurred.

       In  all  modes, in the event that a connection to the zone cannot be established, the connection fails unexpectedly, or the user is lacking
       sufficient privilege to perform the requested operation, zlogin exits with status 1.

       To summarize, the following exit values are returned:

       0        Successful entry.

       1        Permission denied, or failure to enter the zone.

       Any      Return code from utility, or from su(1M) if operating in non-interactive mode.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWzoneu                    |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       login(1), vi(1), su(1M), zoneadm(1M), zonecfg(1M), attributes(5), zones(5)

NOTES

       zlogin fails if its open files or any portion of its address space corresponds to an NFS file. This includes the executable itself  or  the
       shared libraries.

SunOS 5.10                                                          14 May 2004                                                          zlogin(1)