Provided by: postgresql-common_154_all bug


       pg_virtualenv - Create a throw-away PostgreSQL environment for running regression tests


       pg_virtualenv [-ash -v 'version ...'] [command]


       pg_virtualenv creates a virtual PostgreSQL server environment, and sets environment
       variables such that command can access the PostgreSQL database server(s). The servers are
       destroyed when command exits.

       The environment variables PGHOST, PGDATABASE, PGUSER, and PGPASSWORD will be set. Per
       default, a single new cluster is created on port 5432, using the newest PostgreSQL server
       version installed. When more clusters are created for other versions, they will use other
       port numbers.

       pg_createcluster is used to create the database clusters. The clusters are named
       version/regress. To access a cluster, set PGCLUSTER=version/regress. For ease of access,
       the clusters are also registered in /etc/postgresql-common/pg_service.conf, with the
       version number as cluster name. Clusters can be accessed by passing the connection string
       "service=version", e.g. psql service=9.2.

       When invoked as root user, the servers and command are run in an unshared mount and
       network namespace; the servers are created on tmpfses, so actions caused by command in the
       database do not affect the running system.  command can drop privileges as needed,
       provided the environment variables are passed.

       When invoked as non-root user, PG_CLUSTER_CONF_ROOT and PGSYSCONFDIR are set to a
       temporary directory where all files belonging to the clusters are created.


       -a  Use all PostgreSQL server versions installed.

       -v version ...
           Use these versions (space-separated list).

       -c pg_createcluster options
           Extra options to pass to pg_createcluster.

       -i initdb options
           Extra initdb options to pass to pg_createcluster.

       -o guc=value
           Configuration option to set in the postgresql.conf file, passed to pg_createcluster.

       -s  Launch a shell inside the virtual environment when command fails.

       -h  Show program help.


         # pg_virtualenv make check


       When run with fakeroot(1), pg_virtualenv will fall back to the non-root mode of operation.
       Running "fakeroot pg_virtualenv" as root will fail, though.


       initdb(1), pg_createcluster(1), unshare(1).


       Christoph Berg <>