I am currently running PostgreSQL server in AWS EC2 (Ubuntu) and having trouble accessing it from local server. How can I access remote database from local RStudio?
Code in R:
library(RPostgreSQL)
library(DBI)
drv <- dbDriver("PostgreSQL")
con <- dbConnect(drv, user='postgres', password='password', dbname='dvd', host='ec2-xx-xxx-xxxx-xxxx.ap-northeast-2.compute.amazonaws.com',port=5432)
dbListTables(con)
Result:
Error in postgresqlNewConnection(drv, ...) :
RS-DBI driver: (could not connect postgres#ec2-xx-xxx-xxxx-xxxx.ap-northeast-2.compute.amazonaws.com:5432 on dbname "dvd": FATAL: no pg_hba.conf entry for host "130.17.152.1”, user "postgres", database "dvd", SSL off
)
Calls: <Anonymous> ... eval -> dbConnect -> dbConnect -> postgresqlNewConnection
Execution halted
For AWS security group, I have added an inbound for PostgreSQL with its source set it to anywhere with port range 5432.
By default Postgres does not allow remote connections. To allow remote connections you will need to add an entry to the pg_hba.conf file on the EC2 server. The exact location of pg_hba.conf varies with different installations, but here are some paths to try:
/etc/postgresql/[VERSION]/main/
/var/lib/postgresql/[version]/
Once you've found your pg_hba.conf you need to add a line to allow remote connections, for example.
# TYPE DATABASE USER ADDRESS METHOD
host dvd postgres 130.17.152.1/32 md5
This assumes that your local server IP (130.17.152.1) is static. If not, you could use 0.0.0.0/0 for ADDRESS, also, you can use all for DATABASE and USER like so:
# TYPE DATABASE USER ADDRESS METHOD
host all all 0.0.0.0:0 md5
Depends how tight you want your security to be, but bear in mind this is security at the database level and is completely separate to your AWS security groups.
See https://www.postgresql.org/docs/9.1/auth-pg-hba-conf.html for more information.
Related
I needed to put 3 shards of a database on three different servers. So I created 3 servers in pgAdmin(s1,s2,s3), then I put each server one shard. Then, I tried to connect one of the servers in R; however, I couldn't make the connection. I always get an error:
Error in postgresqlNewConnection(drv, ...) : RS-DBI driver: (could not connect postgres#172.17.0.1:5432 on dbname "postgres": could not connect to server: Operation timed out Is the server running on host "172.17.0.1" and accepting TCP/IP connections on port 5432?
My code is:
#install.packages("RPostgreSQL")
require("RPostgreSQL")
library(DBI)
# create a connection
# save the password that we can "hide" it as best as we can by collapsing it
pw <- {
"postgres"
}
# loads the PostgreSQL driver
drv <- dbDriver("PostgreSQL")
# creates a connection to the postgres database
con <- dbConnect(
drv,
dbname = "postgres",
host = "172.17.0.1",
port = 5432,
user = "postgres",
password = pw
)
rm(pw) # removes the password
pgAdmin snap
Did I write something wrong?
if this is using container make sure to forward the port 5432 on 0.0.0.0 i.e the container is listening on the port 5432.
Also you've gotta check this setting if you are not doing the connection locally ONLY>, in the postgresql.conf file:
# - Connection Settings -
#listen_addresses = 'localhost' >>>> This should be = '*' instead of localhost
Save the conf and restart the service. Hope this helps!
I have an ec2 instance set up with my shiny app and my postgresql database, I want to get the shiny-app to read from the database
If I type psql and \conninfo while ssh-ed into my instance I get
You are connected to database "ubuntu" as user "ubuntu" via socket in "/var/run/postgresql" at port "5432".
When I use R in the ec2 command line and type the following, I can read from my database no problem!
drv <- dbDriver("PostgreSQL")
con <- dbConnect(drv, dbname = "ubuntu", host = "/var/run/postgresql", port = 5432, user = "ubuntu", password = pw)
However, when I put these same lines in my shiny app.R file I get
Error in postgresqlNewConnection(drv, ...) :
RS-DBI driver: (could not connect ubuntu#/var/run/postgresql:5432 on dbname "ubuntu": FATAL: Peer authentication failed for user "ubuntu")
I've tried so many different values for host like
host = "localhost"
host = "my ec2 public ip address"
host = "127.0.0.1"
for example and nothing has been working.
my security group for this ec2 instance has an inboud connection to port 5432.
could this be it: why is one file green and the other pink? the green one is the one that works (local) and the pink one is on my instance
Finally figured it out.. this is the same problem as Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails
except that I was getting a different error for the same underlying problem.
the answer that worked for me is the second one:
1.
nano /etc/postgresql/9.x/main/pg_hba.conf
change peer in this line
local all postgres peer
to
local all postgres trust
Restart the server
sudo service postgresql restart
Login into psql and set your password
psql -U postgres
ALTER USER postgres with password 'your-pass';
Finally change the pg_hba.conf from
local all postgres trust
to
local all postgres md5
and that finally worked
I am having trouble creating an SSL connection using RPostgreSQL to an AWS hosted PostgreSQL database.
Here is what I've tried so far:
Created the PostgreSQL database on AWS.
Set the database parameter "rds.force_ssl" to 1.
Downloaded the AWS public key from https://s3.amazonaws.com/rds-downloads/rds-combined-ca-bundle.pem
Test the connection from a windows command prompt with psql (it works).
Executed the following in R:
library(RPostgreSQL)
cert <- paste0("C:/Users/johnr/Downloads/", "rds-combined-ca-bundle.pem")
dbname <- paste0("dbname=", "flargnog", " ", "sslrootcert=", cert, " ", "sslmode=verify-full")
host <- "xxxxxx.xxxxx.us-region-2.rds.amazonaws.com"
con <- dbConnect(dbDriver("PostgreSQL"), user="username", host=host, port=5432, dbname=dbname, password="abcd1234!")
I receive an error message after executing the last statement:
Error in postgresqlNewConnection(drv, ...) :
RS-DBI driver: (could not connect username#xxxxxx.xxxxx.us-region-2.rds.amazonaws.com on dbname "flargnog"
If I change the rds.force_ssl setting to 0 (and remove the ssl stuff from dbname) the connection works just fine.
I have looked at other posts on Stackoverflow related to this issue. This and this seem to indicate an SSL connection is not possible due to issues with RPostgreSQL. However, this post indicates that you can.
Any guidance would be appreciated!
You can try to ssh to the rds instance using e.g. putty and port-forward your local port 5432 to the remote port 5432. Once the ssh connection is open in R just connect to localhost:5432...
Here is how to port-forward using putty:
http://www.akadia.com/services/ssh_putty.html
Here is how this works via command-line:
https://gist.github.com/magnetikonline/3d239b82265398568f31
P.S.: Make sure your instance is in a security-group that accepts ssh connections - port 22
I have a large data-set and I will preform some analysis in R software.
While I could not import the data properly to R.
I get this error:
Error in postgresqlNewConnection(drv, ...) : RS-DBI driver: (could not connect User#local on dbname "Intel"
I have used PostgreSQL to open data and somehow manage it. How can I import the existing data in the PostgreSQL to the R software?
drv <- dbDriver("PostgreSQL")
con <- dbConnect(drv, host='localhost', port='5432', dbname='Swiss',
user='postgres', password='123456')
Moreover, "RPostgreSQL" package in R should be installed.
Try the R package RPostgreSQL http://cran.r-project.org/web/packages/RPostgreSQL/ .
You can see how to use it in http://code.google.com/p/rpostgresql/ .
Example:
library(RPostgreSQL)
drv <- dbDriver("PostgreSQL") ## loads the PostgreSQL driver
con <- dbConnect(drv, dbname="R_Project") ## Open a connection
rs <- dbSendQuery(con, "select * from R_Users") ## Submits a statement
fetch(rs,n=-1) ## fetch all elements from the result set
dbGetQuery(con, "select * from R_packages") ## Submit and execute the query
dbDisconnect(con) ## Closes the connection
dbUnloadDriver(drv) # Frees all the resources on the driver
You have to configure two things on the PostgreSQL server before you are able to connect remotely. This is a instruction how to configure this under Linux:
1. Find and configure postgresql.conf to allow the TCP service to accept connections from any host, not only localhost
find / -name "postgresql.conf"
In my linux OS the file is locate in /etc/postgresql/9.6/main/, so I modify it there. Add the line "listen_addresses = '*'" as follows:
/etc/postgresql/9.6/main/postgresql.conf
#listen_addresses = 'localhost' # what IP address(es) to listen on;
# insert the following line
listen_addresses = '*'
2. Find and configure pg_hba.conf to allow to connect with a client from any host
sudo find / -name "pg_hba.conf"
In my linux OS the file is locate in /etc/postgresql/9.6/main/, so I modify it there. Add the line "host all all 0.0.0.0/0" as follows:
sudo nano /etc/postgresql/9.6/main/pg_hba.conf
# Put your actual configuration here
# ----------------------------------
#
# If you want to allow non-local connections, you need to add more
# "host" records. In that case you will also need to make PostgreSQL
# listen on a non-local interface via the listen_addresses
# configuration parameter, or via the -i or -h command line switches.
#
# insert the following line
host all all 0.0.0.0/0 trust
3. Stop and start the server
sudo service postgresql stop
sudo service postgresql start
4. Connect with you client, now it should work.
GOOD LUCK!
I am making the move from RSQLite to RMySQL and I am confused by the user and password fields. FWIW, I'm running Windows 7, R 2.12.2, MySQL 5.5 (all 64 bit), and RMySQL 0.7-5.
I installed RMySQL as prescribed in this previous SO question, and as far as I know it works (i.e., I can load the package with library(RMySQL)). But when I try to run the tutorial from the R data import guide, I get a "failed to connect to database..." error. This is the code from the tutorial from the guide:
library(RMySQL) # will load DBI as well
## open a connection to a MySQL database
con <- dbConnect(dbDriver("MySQL"), user = "root", password = "root", dbname = "pookas")
## list the tables in the database
dbListTables(con)
## load a data frame into the database, deleting any existing copy
data(USArrests)
dbWriteTable(con, "arrests", USArrests, overwrite = TRUE)
dbListTables(con)
## get the whole table
dbReadTable(con, "arrests")
## Select from the loaded table
dbGetQuery(con, paste("select row_names, Murder from arrests",
"where Rape > 30 order by Murder"))
dbRemoveTable(con, "arrests")
dbDisconnect(con)
On the second line I get the following error:
> con <- dbConnect(dbDriver("MySQL"), user = "richard", password = "root", dbname = "pookas")
Error in mysqlNewConnection(drv, ...) :
RS-DBI driver: (Failed to connect to database: Error: Access denied for user 'richard'#'localhost' (using password: NO)
)
I have tried with and without user and password and with admin as user. I have also tried using a dbname that I made before with the command line and with one that doesn't exist.
Any tips? Is there a good reference here? Thanks!
That is most likely a setup issue on the server side. Make sure that networked access is enabled.
Also, a local test with the command-line client is not equivalent as that typically uses sockets. The mysql server logs may be helpful.
First try to connect to MySQL server using MySQL Workbench or command line mysql using the same parameter. If it connects then R should also be able to connect.
Typically this issue comes when MySQL server doesn't allow connections from remote machines.
As people have told you, you can try to connect to the host with other application as mysql workbench. How odd! When I have tried in RStudio to connect to my db with your code without indicate the host in the command I haven't been able to connect.
I have needed to indicate the host ( host = 'localhost' ) in the command.