This is the command pg_isready that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
pg_isready - check the connection status of a PostgreSQL server
SYNOPSIS
pg_isready [connection-option...] [option...]
DESCRIPTION
pg_isready is a utility for checking the connection status of a PostgreSQL database
server. The exit status specifies the result of the connection check.
OPTIONS
-d dbname
--dbname=dbname
Specifies the name of the database to connect to.
If this parameter contains an = sign or starts with a valid URI prefix (postgresql://
or postgres://), it is treated as a conninfo string. See Section 31.1.1, “Connection
Strings”, in the documentation for more information.
-h hostname
--host=hostname
Specifies 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=port
Specifies the TCP port or the local Unix-domain socket file extension on which the
server is listening for connections. Defaults to the value of the PGPORT environment
variable or, if not set, to the port specified at compile time, usually 5432.
-q
--quiet
Do not display status message. This is useful when scripting.
-t seconds
--timeout=seconds
The maximum number of seconds to wait when attempting connection before returning that
the server is not responding. Setting to 0 disables. The default is 3 seconds.
-U username
--username=username
Connect to the database as the user username instead of the default.
-V
--version
Print the pg_isready version and exit.
-?
--help
Show help about pg_isready command line arguments, and exit.
EXIT STATUS
pg_isready returns 0 to the shell if the server is accepting connections normally, 1 if
the server is rejecting connections (for example during startup), 2 if there was no
response to the connection attempt, and 3 if no attempt was made (for example due to
invalid parameters).
ENVIRONMENT
pg_isready, like most other PostgreSQL utilities, also uses the environment variables
supported by libpq (see Section 31.14, “Environment Variables”, in the documentation).
NOTES
It is not necessary to supply correct user name, password, or database name values to
obtain the server status; however, if incorrect values are provided, the server will log a
failed connection attempt.
EXAMPLES
Standard Usage:
$ pg_isready
/tmp:5432 - accepting connections
$ echo $?
0
Running with connection parameters to a PostgreSQL cluster in startup:
$ pg_isready -h localhost -p 5433
localhost:5433 - rejecting connections
$ echo $?
1
Running with connection parameters to a non-responsive PostgreSQL cluster:
$ pg_isready -h someremotehost
someremotehost:5432 - no response
$ echo $?
2
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