Deploying a Rails 5 app to EC2- RDS DB Instance connectivity error - ruby-on-rails

I have created DB instance and gone through the config process of aws rds instance as per the documentation.
created an instance of db successfully.
also changed the connection params in database.yml accordingly.
I ran the following commands in ngnix server installed on ubuntu 16.04 at aws and also rebooted the db instance several times.
RAILS_ENV=production rake db:create
and db created successfully
and then ran
RAILS_ENV=production rake db:migrate
and database migrated successfully.
an then ran the command
sudo service nginx restart
after all of the process
when I am visiting my app its says
PG::ConnectionBad
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?
here is my database.yml
development:
host: localhost
database: ups_developement_db
adapter: postgresql
encoding: unicode
port: 5432
username: postgres
password: postgres
production:
host: dbcustom.cjocvmnblsa4.us-east-2.rds.amazonaws.com
database: ups_db
adapter: postgresql
encoding: unicode
port: 5432
username: dbmasteruser
password: dbmasterPassword
I am open to provide any kind of information required.
Thanks a lot for your time and solution in advance

It's almost certain that you have not configured the security groups on the RDS instance correctly.
Log into your EC2 and issue the command
telnet <rds hostname> 5432
You should see something like
Trying 10.1.1.2...
Connected to 10.1.1.2.
Escape character is '^]'.
which means that TCP can flow between your EC2 and your RDS.
If not, you need to permit your EC2 to connect to your RDS instance by adding the correct security group configuration.

You should create Environment variables in your AWS RDS instance you should use them in your rails app config file. Check here
database.yml should look like this
production:
adapter: mysql2
encoding: utf8
database: <%= ENV['RDS_DB_NAME'] %>
username: <%= ENV['RDS_USERNAME'] %>
password: <%= ENV['RDS_PASSWORD'] %>
host: <%= ENV['RDS_HOSTNAME'] %>
port: <%= ENV['RDS_PORT'] %>

Related

Rails not able to access Postgresql deployed by Docker

I have a docker container that spins up my Postgres DB, Elasticsearch, and Redis; however, my rails server is unable to connect to the Postgres DB... The server starts, but when it attempts to connect to the DB, I get the error
PG::ConnectionBad (could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
):
When Docker launches the DB, it does so on localhost:5432. Via the terminal, I'm able to connect to the DB by running psql -h localhost -U myUser, but running psql results in the same error...
My rails database.yml file is configured to connect to the database at localhost:5432 with myUser, but I cannot figure out why it is giving me this error. It seems like Rails is attempting to connect to my Postgres.app server instead of the server Docker is running.
Here is my database.yml file
default: &default
adapter: postgis // I have tried "postgresql" as well
encoding: unicode
reconnect: true
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
url: <%= ENV['DATABASE_URL'] %>
development:
<<: *default
database: my_db
username: <my username>
password: <my password>
Here is my .env
DATABASE_URL=postgres://***:***#novus-postgis-localdev:5432
My docker container shows the following
ENVIRONMENT:
DATABASE_URL: postgres://<my username>:<my password>#novus-postgis-localdev:5432
PATH:
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
...
PORTS:
5432/tcp: 0.0.0.0:5432
5432/tcp: :::5432
Therefore, my Rails environment is supposed to connect to my docker DB server, but it appears to be attempting to connect to my Postgres.app server (which isn't running).
What am I missing here / what is wrong with my configurations that have Rails looking at the wrong server?
FWIW, I'm on macOS and I installed Postgres via the Postgres.app.
When the Postgres.app is running a server, the psql command connects to it.
When the Docker container is running, I am unable to start the Postgres. App server because port 5432 is already used (as expected)
UPDATE
I did find out that my Docker DB container is listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" whereas my Rails is pointing to the socket /tmp/.s.PGSQL.5432. I am unable to figure out how to change either of these to be the same (rails to look at /var/run/postgresql/... or docker to launch socket at /tmp/...
In the Postgresql configuration file, try and enter,
listen_addresses='*';

How to connect to a remote database in a digital ocean server

I have a rails application in a windows local machine and i have a postgresql remote database in digital ocean server [ubuntu server]. How to connect it, I tried like this:
database.yml
default: &default
adapter: postgresql
encoding: unicode
host: xxx.xxx.xxx.xx
username: username
password: password
schema_search_path: "public,shared_extensions"
# For details on connection pooling, see Rails configuration guide
# http://guides.rubyonrails.org/configuring.html#database-pooling
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
development:
<<: *default
database: database_name
When i restarted my server i get error
could not connect to server: Connection timed out (0x0000274C/10060) Is the server running on host "xxx.xxx.xxx.xx" and accepting TCP/IP connections on port 5432?
am i doing the right procedure? can anyone get me through this?

Postgres database has no password - can't get into pgadmin

I have a rails app using postgres. When I made the app, I never created a password. In my database.yml file, no password is listed. My application works, but I am trying to connect to the db using pg_admin so I can see the tables. When I try to connect, I am given the following:
Server doesn't listen
The server doesn't accept connections: the connection library reports
could not connect to server: Connection refused Is the server running on host
"localhost" (::1) and accepting TCP/IP connections on port 3000?
How can i fix this? If it helps, here is the code from my database.yml file for development:
development:
adapter: postgresql
encoding: unicode
database: supersmart_dev
pool: 5
username: postgres
host: localhost

setting ip address of database on different server

I deployed a sample Rails app to a remote server with postgres hosted on the same server. The database.yml file was like this.
production:
adapter: postgresql
encoding: unicode
database: remotepg_production
pool: 5
host: localhost
username: mrmann
password: secret
Everything worked fine. I then went into the database.yml file and replaced host: localhost with the ip address of a postgres database on another server host: 178.XXX.XXX like this
production:
adapter: postgresql
encoding: unicode
database: remotepg_production
pool: 5
host: 178.XXX.XXX.XXX #ip address of server with other postgres database
username: mrmann
password: secret
When I restarted postgres on the server with the Rails app, the sample application now gave me the 'something went wrong' page for Rails.
The username and the password for the username are the same on both dbs. Can you suggest what the problem might be? Thanks
Update
These are the settings in pg_hba.conf on the server with the database that I want to connect to.
local all postgres peer
local all all peer
host all all 127.0.0.1/32 md5
host all all ::1/128 md5
Fake Rails app IP: 192.241.XXX.X
Fake Database IP: 192.34.XX.XXX
Do you have access to the database logs? If your connection got as far as attempting to connect to the database, there should be some messages there. My WAG is that you need to add that IP to server's pg_hba.conf file and reload Postgres.
To be more clear, the IP to add to the server's pg_hba.conf is the IP that your application is connecting from, and you should also check the value of the database's listen_addresses setting. If the latter is not set to '*' or to the IP of your application, you'll need to change it in the postgresql.conf and restart the db cluster.
[edit, new information provided]
The line in your pg_hba.conf should be
host all all 192.241.XXX.X md5
Reload (not restart) postgres (eg. pg_ctl reload) and then try connecting again. If it fails, find the db log and see what it shows. If there is no message, then it might be a firewall problem. If the latter is suspected, look for any rules relating to port 5432 in the output of iptables -nvL

can't connect to rds at ec2 server, missing mysql socket

I have an ec2 server and rds server.
and a Ruby On Rails App
connecting to the rds with these settings worked for me in local ENV:
host: myappnameandhash.us-west-2.rds.amazonaws.com
adapter: mysql2
encoding: utf8
reconnect: false
database: mainDb
pool: 20
username: root
password: xxxx
socket: /var/run/mysqld/mysqld.sock
port: 3306
but on my EC2 server I don't have that mysqld.sock file
so i get this error:
FATAL: failed to connect to MySQL (error=Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2))
what do i need to install in order to have the socket?
thanks
update:
I removed the socket definition and the port.
I deploy using capistrano , now i ssh to my server and go to the "current" folder. there i try to run: rake ts:start
and i get the following:
rake aborted!
Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
but i don't even have the socket definition in my database.yml file anymore
Remove the socket and port number from your database.yml file and then try, it will work.
You must specify the "host" of your RDS, and also configure the security groups in the RDS to allow your instance to connect to it.
I know this has been a while, just encountered this issue with my EC2 server connecting to RDS. Would like to share how I resolve this.
First removing socket and port from the database.yml help
#In your database.yml
development:
#some configuration
staging:
#some configuration
production:
adapter: mysql2
encoding: utf8
reconnect: false
pool: 20
host: url.to.rds.server
database: your-database
username: your-username
password: your-password
To run this rake command on production, you need to specify your rails-env, e.g. if you are using production environment, it should be
bundle exec rake ts:start RAILS_ENV=production

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