I am working on a remote Redhat system over SSH. Tomcat 7 and MySQL 5.5 server are both installed and appear to be running correctly.
I can connect to MySQL from a local install of Workbench over SSH tunneling using localhost and a defined MySQL user. I can run queries and navigate tables without incident.
When I try to connect to the same MySQL Server with a Tomcat application running in the same environment using the MySQL defined user (same credentials) that Workbench is connecting with successfully, it fails.
At this point I don't know the exact error message that gets generated (I am not an admin) so any guidance here is appreciated.
My question is why can I connect with Workbench (which is effectively connecting locally), but not with my Tomcat application, which actually is local to the server?
Might it be a permissions issue with the context Tomcat is running under?
References:
Connection string example (credentials have been altered):
jdbc:mysql://localhost/mysql_database_name?user=ApplicationUsername&password=ApplicationPassword"
Furthermore, I have verified that
mysql-connector-java-5.1.27-bin.jar
is in the WEB-INF folder, and:
Class.forName("com.mysql.jdbc.Driver");
resolves.
This web application works in both dev and test on another server connecting using respective credentials.
Be sure the port number of mysql server exists in connection string. Normally if port is not specified, default value would be used as 3306. Maybe your mysql runs on different port?
jdbc:mysql://[host][,failoverhost...][:port]/[database] »
[?propertyName1][=propertyValue1][&propertyName2][=propertyValue2]...
If the host name is not specified, it defaults to 127.0.0.1. If the port is not specified, it defaults to 3306, the default port number for MySQL servers.
Related
I want to be able to connect to and work with a MySQL database that I have on DigitalOcean via PyCharm's database interface (instead of MySQL Workbench, which is what I'm currently using), but when I try to use PyCharm's interface to connect, I get the following error when I click 'Test Connection':
Packet for query is too large (###### > ######). You can change this value on the server by setting the max_allowed_packet' variable.
I'm connecting to DigitalOcean via SSH, and PyCharm is saying that my SSH connection is OK (it's working).
The issue ended up being that I was putting the wrong IP address and port into PyCharm's prompt: I was putting the IP address to my DigitalOcean VM instead of the local IP address of the MySQL db.
Here's a screenshot of the PyCharm settings that ended up working (remember, I was connecting via SSH):
Here's a screenshot of my (working) MySQL Workbench settings, showing which settings I should have copied over to PyCharm:
Im having trouble connecting to my sql server on digital ocean through my flask webapp. Im using flask-sqlalchemy to bind the mysql database to Flask.
Im able to access the mysql server through the phpmyadmin interface at myipaddress:5000/phpmyadmin
Since Im using Nginx (I bound it to port 80). Bound Apache to Port 5000. So my phpmyadmin interface is accessible at
myipaddress:5000/phpmyadmin
In my flask app, i specify the
SQLALCHEMY_DATABASE_URI ='mysql://root:password#myipaddress:5000/databasename'
when i try to create the tables on my database using the shell with db.create_all() - it just doesnt respond. The cursor blinks forever and then i get the operational error that i quote on the title afte a few minutes
Im able to get the same setup running on my local dev machine. So i know its not a flask configuration problem but just a mysql access issue. I have my webapp up on digitalocean (Not sure if mysql server is behind a firewall or something like that making it inaccessible
On the
/etc/mysql/my.cnf
for the bind-address under mysql_d section, i tried all possible combinations and restarted the mysql server with no success
i tried localhost, 127.0.0.1, 127.0.0.1:5000, myipaddress for the bind-address (Also tried commenting it out) without any results.
Also i tried to get the user, current_user on the table properties from the mysql command line, it's listed as root#localhost for both
From this post:Lost connection to MySQL server at 'reading initial communication packet', system error: 0; i get the idea that its related to firewall but not sure how to rectify this.
Anyidea how can i connect my flask app to the mysql server ? Any help would be much appreciated
I was specifying the mysql address as
mysql://root:password#myipaddress:5000/databasename
But since my flask app and the mysql server are running on the same server, the flask app was be able to access the mysql server when i replaced the myipaddress:5000 with localhost:5000
mysql://root:password#localhost:5000/databasename
The phpmyadmin is just a web interface for your database, if you're looking at connecting your Flask application to your MySql database, you need to point the SQLALCHEMY_DATABASE_URI to the actual MySQL database, rather then the web interface to that database.
Usually MySql runs on port 3306. I believe that SQLAlchemy is clever enough to know that's the default, so your connection string should just be: SQLALCHEMY_DATABASE_URI ='mysql://root:password#localhost/databasename' or if you are running on a different port/external IP address: SQLALCHEMY_DATABASE_URI ='mysql://root:password#myipaddress:4444/databasename'. Remember, if you're connecting to a MySQL database on an external server (not the same one as your Flask app is running on) you will have to change the configuration to allow that kind of access.
I'm trying to access a database from the default Linux MySQL client, but all I get is a timeout. It's actually the database used by a WordPress website, and in the configuration file I can see that the IP address of the DB server is actually localhost (127.0.0.1). So I assume that the host name of the DB server is the same as the website's.
I am able to connect to the database with a PHP script that I wrote and uploaded to the server with this same information, and with the show variables query I was able to verify the port number (which was 3306) and specify it to the client. I can see a lot of variables but I'm not sure which one to use.
Any help?
If your Wordpress site is remote, you must connect to DB server like remote connection not local connection. If wordpress and DB server are in the same server, the configuration file to connect with DB is localhost, but if you want connect from remote host you must config your connecto with remote data.
I am working on windows and having a remote desktop connection of another machine. I am trying to connect to the mysql running on the remote machine through my MySql workbench, installed on my machine.
When I specify the details to connect to mysql i.e.
IP- a.b.c.d
port-3306
username=root
password=
But everytime it shows me an error saying-
Your connection attempt to connect to user='root'failed from your host to server at a.b.c.d:3306
Is it possible that I can connect to mysql on a different machine?
Certainly that is possible, mysql is a network transparent service. However obviously the normal access authorization rules apply.
do you have network access to the mysql port, this might be blocked by a firewall. You can check that by using telnet ip-address-of-server 3306. Does the server answer or do you get a timeout or are blocked? (the answer would look cryptic, soomething like 5.5.33-MariaDB[*[n7p~g!�iXccI$r9``Y{$mysql_native_password or similar )
the mysql server can be configured to not listen to remote connections. This can add security to the setup, but would obviously block any remote connection attempts. You will have to check the configuration files of mysql for that.
mysql itself implements an authorization level. So check if that 'root' user actually is allowed to connect from the outside. Those authorizations are stored in the internal "mysql" database.
Also it is not clear from the question what your network topology is: is the mysql server running on that system you have a "remote connection" to? Is the mysql-workbench running on that remote system or on your local system? This might affect the ip address you have to use inside the workbench.
I am working a Django tutorial and I want to connect my project to a MySQL database. I did everything as told by the djangoproject tutorial to connect to database. When running python manage.py syncdb , however, I got the
following error:
_mysql_exceptions.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' (10061)")
What seems problematic? I have XAMMP downloaded and I have created databases through XAMMP before but I don't know how
that affects the connection with Django.
Thanks.
Actually under the settings.py, I set HOST to "127.0.0.1" and PORT to 3306, filled out the rest of DATABASE
portion and it worked!
If you are using Windows 7, you might run into problems if your MySQL is configured to use named pipes. Set your MySQL config to use TCP instead.
Once your reconfigured MySQL allows local network connections, your MySQLdb should work over TCP.
It doesn't seem to be able to use
Windows 7 named pipes, although the "mysql" command line client can.
There may be a bug. This wouldn't be noticed unless MySQL
was configured without network connections, which is rare. I set
up MySQL that way on a development machine with a local MySQL instance.
A detailed article here - http://interconnectit.com/764/using-mysql-workbench-with-xampp/ - shows you the screen where you can switch your Connection Method from named pipes (Local Socket/Pipes) to TCP/IP via Xampp.
Alternatively, if using named pipes (windows) or sockets (linux/mac) for your python/django app to connect to your MySQL is important to you and you do not want to change your connection method to TCP/IP, you should try setting the servername to "." in your xampp's my.conf configuration file; instead of "localhost" or "127.0.0.1". Using pipes/sockets bypasses the TCP/IP network protocol, giving slightly better performance.