zlogin(1) User Commands zlogin(1)NAMEzlogin - enter a zone
SYNOPSISzlogin [-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 example, vi(1),
work properly in this mode. In this mode, zlo‐
gin 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.
The specified command is passed as a string and
interpreted by a shell running in the non-
global zone. See rsh(1).
Console Mode If the -C option is specified, the user is con‐
nected 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 persis‐
tent 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 dis‐
connect 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 spec‐
ified.
-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-interactive
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 │system/zones │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOlogin(1), rsh(1), vi(1), su(1M), zoneadm(1M), zonecfg(1M),
attributes(5), zones(5)NOTESzlogin fails if its open files or any portion of its address space cor‐
responds to an NFS file. This includes the executable itself or the
shared libraries.
SunOS 5.11 18 Dec 2006 zlogin(1)
