createuser — define a new LightDB user account
createuser [connection-option...] [option...] [username]
createuser creates a
new LightDB user (or more precisely, a role).
Only superusers and users with CREATEROLE privilege can create
new users, so createuser must be
invoked by someone who can connect as a superuser or a user with
CREATEROLE privilege.
If you wish to create a new superuser, you must connect as a
superuser, not merely with CREATEROLE privilege.
Being a superuser implies the ability to bypass all access permission
checks within the database, so superuser access should not be granted lightly.
createuser is a wrapper around the SQL command CREATE ROLE. There is no effective difference between creating users via this utility and via other methods for accessing the server.
createuser accepts the following command-line arguments:
usernameSpecifies the name of the LightDB user to be created. This name must be different from all existing roles in this LightDB installation.
-c number--connection-limit=numberSet a maximum number of connections for the new user. The default is to set no limit.
-d--createdbThe new user will be allowed to create databases.
-D--no-createdbThe new user will not be allowed to create databases. This is the default.
-e--echoEcho the commands that createuser generates and sends to the server.
-E--encryptedThis option is obsolete but still accepted for backward compatibility.
-g role--role=role
Indicates role to which this role will be added immediately as a new
member. Multiple roles to which this role will be added as a member
can be specified by writing multiple
-g switches.
-i--inheritThe new role will automatically inherit privileges of roles it is a member of. This is the default.
-I--no-inheritThe new role will not automatically inherit privileges of roles it is a member of.
--interactive
Prompt for the user name if none is specified on the command line, and
also prompt for whichever of the options
-d/-D,
-r/-R,
-s/-S is not specified on the command
line. (This was the default behavior up to LightDB 9.1.)
-l--loginThe new user will be allowed to log in (that is, the user name can be used as the initial session user identifier). This is the default.
-L--no-loginThe new user will not be allowed to log in. (A role without login privilege is still useful as a means of managing database permissions.)
-P--pwpromptIf given, createuser will issue a prompt for the password of the new user. This is not necessary if you do not plan on using password authentication.
-r--createrole
The new user will be allowed to create new roles (that is,
this user will have CREATEROLE privilege).
-R--no-createroleThe new user will not be allowed to create new roles. This is the default.
-s--superuserThe new user will be a superuser.
-S--no-superuserThe new user will not be a superuser. This is the default.
-V--versionPrint the createuser version and exit.
--replication
The new user will have the REPLICATION privilege,
which is described more fully in the documentation for CREATE ROLE.
--no-replication
The new user will not have the REPLICATION
privilege, which is described more fully in the documentation for CREATE ROLE.
-?--helpShow help about createuser command line arguments, and exit.
createuser also accepts the following command-line arguments for connection parameters:
-h host--host=hostSpecifies the host name of the machine on which the server is running. If the value begins with a slash, it is used as the directory for the Unix domain socket.
-p port--port=portSpecifies the TCP port or local Unix domain socket file extension on which the server is listening for connections.
-U username--username=usernameUser name to connect as (not the user name to create).
-w--no-password
Never issue a password prompt. If the server requires
password authentication and a password is not available by
other means such as a .pgpass file, the
connection attempt will fail. This option can be useful in
batch jobs and scripts where no user is present to enter a
password.
-W--passwordForce createuser to prompt for a password (for connecting to the server, not for the password of the new user).
This option is never essential, since
createuser will automatically prompt
for a password if the server demands password authentication.
However, createuser will waste a
connection attempt finding out that the server wants a password.
In some cases it is worth typing -W to avoid the extra
connection attempt.
LTHOSTLTPORTLTUSERDefault connection parameters
LT_COLOR
Specifies whether to use color in diagnostic messages. Possible values
are always, auto and
never.
This utility, like most other LightDB utilities, also uses the environment variables supported by libpq (see Section 32.14).
In case of difficulty, see CREATE ROLE and ltsql for discussions of potential problems and error messages. The database server must be running at the targeted host. Also, any default connection settings and environment variables used by the libpq front-end library will apply.
To create a user joe on the default database
server:
$createuser joe
To create a user joe on the default database
server with prompting for some additional attributes:
$createuser --interactive joeShall the new role be a superuser? (y/n)nShall the new role be allowed to create databases? (y/n)nShall the new role be allowed to create more new roles? (y/n)n
To create the same user joe using the
server on host eden, port 5000, with attributes explicitly specified,
taking a look at the underlying command:
$createuser -h eden -p 5000 -S -D -R -e joeCREATE ROLE joe NOSUPERUSER NOCREATEDB NOCREATEROLE INHERIT LOGIN;
To create the user joe as a superuser,
and assign a password immediately:
$createuser -P -s -e joeEnter password for new role:xyzzyEnter it again:xyzzyCREATE ROLE joe PASSWORD 'md5b5f5ba1a423792b526f799ae4eb3d59e' SUPERUSER CREATEDB CREATEROLE INHERIT LOGIN;
In the above example, the new password isn't actually echoed when typed, but we show what was typed for clarity. As you see, the password is encrypted before it is sent to the client.