I am having troubles getting started with psql. I can login using the script below
myusername#ubuntu:~/Desktop/dbscripts$ sudo su - postgres
postgres#ubuntu:~$
But, once here, I cannot figure out how to find my .sql file.
I tried the options supplied by Bolo here:
How to import existing *.sql files in PostgreSQL 8.4?
But they only give
myusername#ubuntu:~/Desktop/dbscripts$ psql -U root -d first -f myscript.sql
psql: FATAL: Peer authentication failed for user "root"
and
myusername#ubuntu:~/Desktop/dbscripts$ psql -f myscript.sqlp
sql: FATAL: role "myusername" does not exist
and
myusername#ubuntu:~/Desktop/dbscripts$ sudo su - postgres
postgres#ubuntu:~$ \i myscript.sql
The program 'i' is currently not installed. To run 'i' please ask your administrator to install the package 'iprint'
This can be handled from any of the above options you tried. In which path do you have myscript.sql? After you do su - postgres, give the full path . So it will be psql -d first -f <pathtosqlfile>/myscript.sql. psql -U root will not work unless you have a user root in the database. Try psql -U postgres. You can do \i sqlscript at psql prompt, not at linux command prompt as you have done. The error you are getting "role "myusername" does not exist" can be avoided either by using -U postgres (or any other db user) or by setting the PGUSER environment variable.
Related
I have installed PostgreSQL server in Google Colab as follows :
# Install postgresql server
!apt update > /dev/null
!apt install postgresql > /dev/null
!service postgresql start
and have then configured the 'postgres' userid and database as follows :
# Setup a password `pass` for username `postgres`
!sudo -u postgres psql -U postgres -c "ALTER USER postgres PASSWORD 'pass';"
#
# Setup a database with name `praxis` to be used
!sudo -u postgres psql -U postgres -c 'DROP DATABASE IF EXISTS praxisdb;'
!sudo -u postgres psql -U postgres -c 'CREATE DATABASE praxisdb;'
Subsequently, I have created a table, inserted data and run the select command
!psql -h localhost -p 5432 -Upostgres -W -dpraxisdb -c 'create table dept ... ;'
!psql -h localhost -p 5432 -Upostgres -W -dpraxisdb -c "INSERT INTO Dept ... ;"
!psql -h localhost -p 5432 -Upostgres -W -dpraxisdb -c "select * from dept;"
All this works perfectly but each time, I am prompted to enter the password. I wish to avoid having to enter the password each time. Based on what I read in the documentation on using password files, I created a file ~/.pgpass as follows :
!echo "localhost:5432:praxisdb:postgres:pass" > ~/.pgpass
!chmod 0600 ~/.pgpass
Now, when I execute any command, eg.
!psql -c "select * from dept;"
I get the error
psql: error: FATAL: role "root" does not exist
Where does this role root come from? I looked at the file ~/.pgpass and noted that its owner and group is root and I changed that to postgres using chown, chgrp, but that does not solve the problem. What else should I do in this case to solve the problem.
The version of Postgres and the OS is as follows :
!sudo -u postgres psql -V
psql (PostgreSQL) 12.13 (Ubuntu 12.13-0ubuntu0.20.04.1)
You misunderstand how the password file works. You still have to specify host, port, database and user in your connection request. The client library then searches the matching entry in the password file and reads the password.
I am able to run psql by doing the following:
Davids-d david$ psql --u postgres
Password for user postgres:
psql (9.4.18)
Type "help" for help.
postgres=#
However, when I run the following command, I get an error:
Davids-iMac:datadocs david$ sudo -u postgres psql -f resources/postgresql/initdb.sql
could not identify current directory: Permission denied
What does this mean, and how would I resolve this? Note that I do have the following var set:
david$ echo $PGDATA
/Users/david/PostgreSQL/data/pg94
The issue is the sudo -u postgres.
Your shell is running as you, but you're running the command as the postgres user. It does not have permission to see the file or even be in the current directory.
We can eliminate psql from the equation by just trying to read the file as the postgres user with sudo -u postgres cat resources/postgresql/initdb.sql. You should get the same error.
There's two things you have to do...
cd to a directory that the postgres user can be in.
Put the file in a place the postgres user can access.
/tmp, for example.
Your command seems wrong, try this:
sudo psql -U postgres -f resources/postgresql/initdb.sql
I am setting up a website and am having some trouble restoring a database .dump file. I am using centos7, selinux, postgresql 9.4, and apache2.
This is my pg_hba.conf file.
This is the command I am trying to move the dump:
psql --single-transaction -U postgres db_name < dump_location
When I do this, I get the error:
Permission denied.
Am I missing something or is there someway I should alter my settings? Let me know if you need more information.
Thank you!
The operating system user you are running your shell as does not have permission to read the path dump_location.
Note that this is not necessarily the operating system user you run psql as. In a statement like:
sudo -u postgres psql mydb < /some/path
then /some/path is read as the current user, before sudo, not as user postgres, because it's the shell that performs the input redirection, not psql.
If, in the above example, you wanted to read the file as user postgres you would:
sudo -u postgres psql -f /some/path mydb
That instructs psql to open and read /some/path when it's started.
Just make sure that you are using correct database user and you have at least read permission on the dump file.
"psql -d -U postgres -f "
will work.
I'm trying to build a setup script to automate the development environments creation, but I'm having trouble both trying to pipe or using the -c modifier for psql.
I've tried:
sudo su postgres psql -c "ALTER ROLE postgres WITH password 'pass'"
and
sudo su postgres psql -c "ALTER ROLE postgres WITH password 'pass';"
Both of which say "ALTER: command not found"
I've also tried pipe, but I'm not able to combine it with su correctly
eg: I tried something like
sudo su postgres echo "ALTER ROLE postgres WITH password 'pass'" | psql
But postgres can't execute "echo"
And:
echo "ALTER ROLE postgres WITH password 'pass'" | sudo su psql
Which just doesn't work.
So, my first question is: how can I execute this simple command from a sh file?
And the second one, less related: how can I use different users in the commands chained with pipe?
What's wrong is the lack of -c or --command for su to indicate that the rest of the line is a command.
But su is not needed anyway, because there's already sudo. Do this instead:
sudo -u postgres psql -c "ALTER ROLE postgres WITH password 'pass'"
If you are just like me, make sure you are not running this from:
bash-4.2$
but:
postgres=#
Whenever I try to run 'psql' I receieve the following error message:
ahcarpenter#ubuntu:~$ psql
psql: FATAL: role "ahcarpenter" does not exist
Any ideas on how to fix this?
That happens because
$ psql
is equivalent to
$ psql ahcarpenter -U ahcarpenter
As that user does not exist enter as user postgres
$ psql -U postgres
Once inside create the user and the database "ahcarpenter".
create user ahcarpenter;
create database ahcarpenter with owner ahcarpenter;
exit
\q
Reenter
$ psql