Hi,
is there any possibility to download data  into local grass database 
(topologcal) from remote postgis server? (without getting error)
Or is the issue still pending? (http://osgeo-org.1560.x6.nabble.com/Unable-
to-link-to-postgis-postgresql-td5285313.html)
I am using Python to work with GRASS. And honestly, I got lost in outputs of
db.* functions:

#set database and login
gscript.run_command('db.connect', database="host=172.21.3.20,dbname=mydb", 
driver="pg",  verbose = True)
gscript.run_command('db.login', user="dbusername", password="passwd", 
overwrite = True)

#verifying connection
gscript.run_command('db.connect', flags='p')
output:
driver: pg
database: host=172.21.3.20,dbname=mydb
schema:
group:
#so everything looks fine so far

#here comes the trouble - simple list tables in db
gscript.run_command('db.tables', flags='p', verbose = True)
output:
DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

ERROR: Unable to open database <host=172.21.3.20,dbname=mydb>

#but for example:
gscript.run_command('v.external',
                    input="PG:dbname=mydb host=172.21.3.20",
                    flags='l', overwrite =  True)
output:
--actuall list of all tables in mydb - so i CAN connect to the server!

#same for mapping external link - following will create external link
gscript.run_command('v.external',
                    input="PG:dbname=mydb host=172.21.3.20 user=dbusername
password=password",
                    layer="myschema.mytable", output='outpoints, overwrite =
  True)
output:
WARNING: No key column detected.
WARNING: Feature table <outpoints> has no primary key defined. Unable to
         define DB links.
WARNING: Feature table <outpoints> has no primary key defined
WARNING: Random read is not supported for this layer. Unable to build
         topology.
v.external complete. Link to vector map <outpoints> created.

#weird, because i have primary key defined in the table, following is
printing description of that external link
gscript.vector_info("outpoints")

#if i try to load data from database
gscript.run_command('v.in.ogr',
                    input="PG:dbname=mydb host=172.21.3.20",
                    layer='myschema.mytable',geometry="mygeomcolumn", output
= "outpoints2", overwrite =  True, type="point")
output:
Check if OGR layer <myschema.mytable> contains polygons...
 100%�����
WARNING: Vector map <outpoints2> already exists and will be overwritten
DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

WARNING: Unable to open database <host=172.21.3.20,dbname=macfishdb> by
         driver <pg>
WARNING: Unable open database <host=172.21.3.20,dbname=macfishdb> by driver
         <pg>
WARNING: Unable to find table <outpoints2> linked to vector map <lp_grass>
Creating attribute table for layer <at_macfish.loggerpos>...
DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

DBMI-PostgreSQL driver error:
Connection failed.
could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

WARNING: Unable to open database <host=172.21.3.20,dbname=mydb> by
         driver <pg>
ERROR: Unable to open database <host=172.21.3.20,dbname=mydb> by
       driver <pg>

My version of grass:
GRASS version: 7.4.0                                                        
   
GRASS SVN revision: exported                                                
   
Build date: 2018-01-26                                                      
   
Build platform: x86_64-pc-linux-gnu                                         
   
GDAL: 2.2.2                                                                 
   
PROJ.4: 4.9.2                                                               
   
GEOS: 3.5.1                                                                 
   
SQLite: 3.11.0                                                              
   
Python: 2.7.12                                                              
   
wxPython: 3.0.2.0                                                           
   
Platform: Linux-4.4.0-112-generic-x86_64-with-Ubuntu-16.04-xenial  

Version of python:

Python 2.7.12 64bits

Content of my .grass7/dblogin:
pg|host=172.21.3.20, dbname=mydb|dbusername|passwd||
sqlite|$GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db|dbusername|passwd||
pg|macfishdb|dbusername|passwd||
pg|host=172.21.3.20,dbname=mydb|dbusername|passwd||

Thank you for any comment
Dead Vil


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