I have CentOS 7 running in VirtualBox on OSX. Apache, PHP 5.4 and PostgreSQL 9.2 are all running. But, when my (simple) php-script tries to connect to PostgreSQL it doesn't work:
Warning: pg_connect(): Unable to connect to PostgreSQL server: could
not connect to server: Permission denied Is the server running on host
"127.0.0.1" and accepting TCP/IP connections on port 5432? in
/var/www/html/pg.php on line 7
Checks:
Apache is running
PHP is fine, phpinfo() tells me PostgreSQL functions are available
PostgreSQL 9.2 is running
psql can connect to the database using localhost or 127.0.0.1 and also 192.168.178.111
pgAdmin on my Mac can connect to this database using ip address 192.168.178.111
iptables has been turned off
pg_hba.conf has been changed to accept all connections without any password (stupid, I know):
host all all 0.0.0.0/0 trust
But php can't connect....
This is my script:
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
echo 'hello world!';
$conn = pg_connect('host=127.0.0.1 port=5432 user=postgres dbname=postgres');
?>
Internal connections work (psql), external connections also work (pgAdmin on a my laptop), but the php connection doesn't work...
What is going wrong? What is it that I'm missing?
Probably SELinux is blocking your database connection.
Make sure that you set the correct boolean to allow your web application to talk to the database:
sudo setsebool -P httpd_can_network_connect_db 1
Related
I am trying to install Postgres as a backend DB instead of Sqllite. I followed these steps but ran into an error. can someone help, please?
Steps followed:
activated virtual env.
installed postgreSQL
sudo apt-get install postgresql postgresql-contrib
created psql object with:
sudo -u postgres psql
4.create the user and database for the airflow
CREATE USER **** PASSWORD '****';
postgres=# CREATE DATABASE airflow;
postgres=# GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO newt;
updated postgresql.conf with listen_addresses= '*'
added pg_hba.conf with
host db-name user-name ip-address trust
updated airflow.cfg file with
sql_alchemy_conn = postgresql+psycopg2://user-name:password#localhost:5432/db-name
restarted airflow db.
airflow resetdb
After the 8th steps I got below error, what am i doing wrong here? any advise
Error message
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
After changing the pg_hba.conf and postgresql.conf you have to tell PostreSQL that a change has been made. You can do it by either restarting the database, e.g. on Ubuntu
$ sudo service postgresql restart
... or by executing the function pg_reload_conf
SELECT pg_reload_conf():
In case client and database are in different machines, make sure that there is no firewall between them messing things up.
Unrelated note: Also keep in mind that setting a connection to trust in the pg_hba.conf means that no password is required. For testing purposes more than legit but quite dangerous if forgotten in production ;)
** new to pgadmin and postgress **
my organization uses PostgreSQL on its server with ubuntu os, I try to connect it using pgadmin 3,
these are the stapes I have taken
changed pg_hba.conf using 'sudo nano /etc/postgresql/9.3/main/pg_hba.conf'
changed listen_addresses='*' in postgresql.conf file
sudo ufw allow 5432/tcp
but still, I am unable to connect I get this error from pg admin:
Server doesn't listen
The server doesn't accept connections: the connection library reports could not connect to server: Connection timed out Is the server running on host "103.72.131.155" and accepting TCP/IP connections on port 5432?
how can I fix it,
is there any website which can guide me step by step to connect pgadmin to PostgreSQL.
I install pgadmin4 using the following command sudo install pgadmin4 and then I installed postgresql using sudo install postgresql . In my terminal I ran the command psql -U postgres -h localhost
It shows connection refuse
Then I go to pgadmin4 and created a server and I wanted to connect to the server it shows
pgadmin connection refuse
Then I wrote host all all all md5 in pg_hba.conf file and I wrote listen_addresses = '*' to postgresql.conf file. and I wrote the following command sudo service postgresql restart but again It shows connection refuse message.
I wrote psql and it shows connections on Unix domain socket
Can you please help me in this regard? What I have missed?
I think I followed any possible guide before asking here.
I am trying to remotely connect to a PostgreSQL db installed on a EC2 Linux instance (Ubuntu server 18.04, free tier if it matters).
Here are all the steps I did before hitting a wall and begging for help.
I connected to my instance via SSH
I downloaded and installed postgres following this docs
I created a new used (umberto)
I created a new DB (wondermap)
I created a new OS user with the same name as in step 3 (umberto)
I connected to my new db with my new user from the server and everything woked fine
I edited /etc/postgresql/10/main/pg_hba.conf adding these lines:
host all all 0.0.0.0/0 md5
host all all ::/0 md5
I edited /etc/postgresql/10/main/postgresql.conf changing #listen_addresses = 'localhost' into listen_addresses = '*'
i restarted the postgres server with sudo service postgresql restart
I added a new Inbound rule in the instance security group like so:
TCP port:5432 source:0.0.0.0/0, ::/0
After all, I am trying to connect from my local mahine (either using pgadmin3 or psql) but I still receive a timeout error (host is hidden):
psql -h <PUBLIC-IP-OF-MY-INSTANCE> -U umberto -d wondermap
or even
psql -h <PUBLIC-IP-OF-MY-INSTANCE> -U postgres
psql: could not connect to server: Connection timed out
Is the server running on host "<PUBLIC-IP-OF-MY-INSTANCE>" and accepting
Doing SELECT version(); shows:
PostgreSQL 10.7 (Ubuntu 10.7-0ubuntu0.18.04.1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0, 64-bit
What could be the problem?
Apparently, I stil had to unblock postgres port on server's firewall.
sudo ufw allow 5432/tcp
That did the trick!
I'm trying to connect my local gui for postgres to a virtual server that I have running postgres.
I can
su postgres_user
Then
pgsql
Here pgsql loads.
When I go to my pg_hba.conf I have
host all all x.x.x.x/24 trust
In postgresql.conf
listen_addresses = 'localhost,x.x.x.x'
I have ubuntu 16 and postgres 9.5
I have the issue when I try to connect I get the error:
could not connect to server: Connection refused...Is the server running on host "hostip" and accepting TCP/IP connections on port 5432.
If you are using linode, you must either whitelist your ip or use putty (in windows) to tunnel postgres to connect to it.
putty tunneling is easier, however more annoying to deal with on a day to day basis
Follow the tutorial here.
here
Note, it's the same for PGAdmin as it is for any gui in windows.