Server ip: 172.16.1.169
mysql user name: root
passwd: xxxxxxxxxx
database name: example
I'm trying to access a database from a client (ip 172.16.0.114). Both the server and client are running the Fedora distribution of Linux. What settings need to be configured, and what should they be set to, for both the server and client? How do I access a specific database (here, "example")? I tried but I got an error:
ERROR 2003 (HY000): Can't connect to MySQL server on '172.16.1.169'.
That error message is generated by the client (not the server) because a connection to the server has been attempted but the server could not be reached.
There are various possible causes to that:
1) check that mysqld is running on the server:
ps -ef | grep mysqld
should return something like:
root 2435 2342 0 15:49 pts/1 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/var/ --user=mysql
mysql 2480 2435 0 15:49 pts/1 00:00:00 /usr/local/mysql/libexec/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/var/ --user=mysql ...
To run the daemon service, run on redhat/fedora/centos:
service mysqld start
or on Fedora release >= 16, which relies on systemd:
systemctl start mysqld.service
and for enabling daemon auto-startup at system boot:
systemctl enable mysqld.service
2) check the port on which mysqld is running on the server:
netstat -lnp | grep mysql
should return:
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2480/mysqld
unix 2 [ ACC ] STREAM LISTENING 8101 2480/mysqld /tmp/mysql.sock
the latter is the socket for local connections, the first the tcp port for networking (default 3306). If the port is not the default port, you must set the connection port on the client. If using mysql client:
mysql dbname -uuser -ppasswd -P<port> ...
3) being on a different net address, check that the server listens for the net addrees your are connecting from: in file /etc/my.cnf search for the line:
bind_address=127.0.0.1
if the address is 127.0.0.1 only local connections are allowed; if it were 172.16.1.0, you could not connect from 172.16.2.xxx
4) check that on the server there is no firewall running and blocking connections to mysql port (3306 is the default port); if it's a redhat/fedora/centos run
service iptables status
Open MySQL config file
sudo vim my.cnf
Ensure that the following are commented out.
#skip-external-locking
#skip-networking
#bind-address = xx.xx.xx.xx
Save and exit
Restart mysql service
In MySQL config file (/etc/mysql/my.cnf) comment '#bind-address = 127.0.0.1'
Save and restart mysql service.
I think the destination mysql server might use a different port.
You have to find the correct port first.
Once you get the correct port you can connect to that mysql server by using this command:
mysql -h 172.16.1.169 -P (port) -u root -p (password)
I got an error after loading new data to mysql.
Basically, I used something like mysqldump -u root -p --all-databases > alldb.sql to export data from my last DB.
Then I use mysql -u root -p ... then \. malldb.sql.
when I restart my system I can not connect to DB anymore.
I tried this
then I got this :
user#user $ mysqld_safe --skip-grant-tables &
2017-05-29T08:41:32.336559Z mysqld_safe Logging to '/var/log/mysql/error.log'.
2017-05-29T08:41:32.343064Z mysqld_safe Directory '/var/run/mysqld' for
UNIX socket file don't exists.
[1]+ Exit 1 mysqld_safe --skip-grant-tables
then
user#user$ : mysql -uroot
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
I think the diagnostic of this answer is correct, but still unable to understand why it not working.
can someone help?
Update
when I use :
`user#user# /etc/init.d/mysql start`
[ ok ] Starting mysql (via systemctl): mysql.service.
then :
user#user# mysql -uroot -p
ERROR 1524 (HY000): Plugin 'unix_socket' is not loaded
After that, I reinstalled mysql, but still got: Can't connect to Error: local MySQL server through socket'/tmp/mysql.sock'(2).
Tried to start the server: start mysql.server, but got:
ERROR! The server quit without updating PID file (/usr/local/var/mysql/appledeMacBook-Pro-6.local.pid).
The next thing I tried was:
mysqladmin -h 127.0.0.1 -u root -p shutdown
and got:
mysqladmin: connect to server at '127.0.0.1' failed
error: 'Can't connect to MySQL server on '127.0.0.1' (61)'
Check that mysqld is running on 127.0.0.1 and that the port is 3306.
You can check this by doing 'telnet 127.0.0.1 3306'
I followed this tip (telnet 127.0.0.1 3306) and got:
connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host
How can I fix this?
ps aux | grep mysql
sudo kill -9 [PID]
sudo mysql.server start
I hope you tried restarting your machine and I hope you give mysql correct permission to write.
Why can't I connect to the mysql server?
On the same server an Apache/PHP server is running and it connects without problems!?
var mysql_link = {
host : 'localhost',
port : 3308,
database: 'nodetest',
user : 'root',
password : 'xxx'
};
var connection = mysql.createConnection(mysql_link);
connection.connect(function(err){
console.log(err);
if(err != null){
response.write('Error connecting to mysql:' + err+'\n');
}
});
connection.end();
error
{ [Error: connect ECONNREFUSED]
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
fatal: true }
update
root#dyntest-amd-6000-8gb /var/www/node/dyntest # ps ax | grep mysqld
7928 pts/0 S+ 0:00 grep mysqld
28942 ? S 0:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/run/mysqld/mysqld.pid
29800 ? Sl 17:31 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/var/lib/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/var/lib/mysql/mysql-error.log --open-files-limit=65535 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
I know this question has been answered, but for me the problem was that the mysql server listens on a Unix socket not on a tcp socket. So the solution was to add:
port: '/var/run/mysqld/mysqld.sock'
to the connection options.
If this has worked before, my first guess would be that you've already got a copy of your node.js script running in the background which is holding the connection.
I believe connection refused is a tcp/ip error message, rather than something from MySQL which suggests that it is either not running or is running on another port or with sockets.
Could you try telnet'ing to port 3308? To see if the server is running on that port?
telnet localhost 3308
Can you also try:
mysql -hlocalhost -uroot -pxxx
Overview
For anyone else having this problem and is running mamp. I suspected the problem had to do with the network and not MySQL or Node.js.
Solution
If you open MAMP and click MySQL in the left navigation panel it will pull up the MySQL options page. In the center of the page you will see a checkbox that says,
"Allow network access to MySQL".
Check this box and then restart your MAMP. At this point you can now test your connection to MySQL with telnet or a node.js script.
Hint
Remember you can check which port your MySQL is running on by opening MAMP and clicking the ports link on the left navigation panel.
Visual Aid
For some very odd reason, my computer only allowed me to have port 3306 as default port for my connection in order for it to work.
Mac OS on M1 MacBook Pro here with MySQL installation via brew:
Changing the host from 'localhost' to '127.0.0.1' and creating a different user with a password solved this issue for me.
For some reason I cannot connect to my DB with root user and no password.
I created the new user on MySQL Workbench, but you can create a new user with admin privileges via the mysql CLI also.
Just google it.
This is how my backend looks:
const express = require('express');
const mysql = require('mysql');
const app = express();
const port = 3500;
const db = mysql.createConnection({
host: '127.0.0.1',
user: 'admin',
password: 'admin',
});
db.connect((err) => {
if (err) throw err;
console.log('connected to database');
});
app.listen(port, () => {
console.log('server listening on port 3500');
});
I wanted to comment my solution here, just in case there were people as newbie as me in databases.
I was getting this error because I had installed the mysql NPM package correctly but I hadn't installed any implementation of MySQL on my computer (I didn't know I had to).
I'm using Arch Linux so, in my case, with the NPM package already installed in my project, I did pacman -Syu mariadb (MariaDB is the default implementation of MySQL in Arch Linux) and then configured it following the guide.
Then, you can use the root user you just configured or create a new one to use in your project. For the latter:
Enter mysql CLI by running mysql -u root -p.
Enter the password for root user.
Create a new database with CREATE DATABASE mydatabase;.
Create a new user with CREATE USER test IDENTIFIED BY "testpass";.
Grant privileges to test user to use your new database with GRANT ALL PRIVILEGES ON mydatabase.* TO test#localhost IDENTIFIED BY "testpass";. See for more information on this.
And then, in my project, I would have:
let connection = mysql.createConnection({
host: "localhost",
user: "test",
password: "testpass",
database: "mydatabase"
});
If you are using MAMP please note that mysql default db_port is set to 8889 so you for this purpose I had to change it to 3306 (or whatever your app mysql db_port is set to).
My issue was that node server was connecting using port 3306, so it was giving the error below then crashing but mysql was up and seemed to establishing a connection through localhost, although I couldnt test it because node server was down.
errno: -61,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 3306,
fatal: true
Once I changed the port on MAMP mysql from 8889 to 3306, node server established connection through port 3000 and giving the statement below:
server running on port 3000
The solution is: 2
I use Windows 10 and I have Windows Subsystem For Linux (WSFL). I can execute my project from the WSFL console, but my MySQL is installed in Windows and they can not connect, however when I execute my project from a Windows console then it works without any problems.
Server ip: 172.16.1.169
mysql user name: root
passwd: xxxxxxxxxx
database name: example
I'm trying to access a database from a client (ip 172.16.0.114). Both the server and client are running the Fedora distribution of Linux. What settings need to be configured, and what should they be set to, for both the server and client? How do I access a specific database (here, "example")? I tried but I got an error:
ERROR 2003 (HY000): Can't connect to MySQL server on '172.16.1.169'.
That error message is generated by the client (not the server) because a connection to the server has been attempted but the server could not be reached.
There are various possible causes to that:
1) check that mysqld is running on the server:
ps -ef | grep mysqld
should return something like:
root 2435 2342 0 15:49 pts/1 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/var/ --user=mysql
mysql 2480 2435 0 15:49 pts/1 00:00:00 /usr/local/mysql/libexec/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/var/ --user=mysql ...
To run the daemon service, run on redhat/fedora/centos:
service mysqld start
or on Fedora release >= 16, which relies on systemd:
systemctl start mysqld.service
and for enabling daemon auto-startup at system boot:
systemctl enable mysqld.service
2) check the port on which mysqld is running on the server:
netstat -lnp | grep mysql
should return:
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2480/mysqld
unix 2 [ ACC ] STREAM LISTENING 8101 2480/mysqld /tmp/mysql.sock
the latter is the socket for local connections, the first the tcp port for networking (default 3306). If the port is not the default port, you must set the connection port on the client. If using mysql client:
mysql dbname -uuser -ppasswd -P<port> ...
3) being on a different net address, check that the server listens for the net addrees your are connecting from: in file /etc/my.cnf search for the line:
bind_address=127.0.0.1
if the address is 127.0.0.1 only local connections are allowed; if it were 172.16.1.0, you could not connect from 172.16.2.xxx
4) check that on the server there is no firewall running and blocking connections to mysql port (3306 is the default port); if it's a redhat/fedora/centos run
service iptables status
Open MySQL config file
sudo vim my.cnf
Ensure that the following are commented out.
#skip-external-locking
#skip-networking
#bind-address = xx.xx.xx.xx
Save and exit
Restart mysql service
In MySQL config file (/etc/mysql/my.cnf) comment '#bind-address = 127.0.0.1'
Save and restart mysql service.
I think the destination mysql server might use a different port.
You have to find the correct port first.
Once you get the correct port you can connect to that mysql server by using this command:
mysql -h 172.16.1.169 -P (port) -u root -p (password)