REDIS php extension connect error

REDIS php extension connect error - php

When I use redis PHP extension, I get the error, the host is 127.0.0.1 and the port is 6379.
Redis::connect(): php_network_getaddresses: getaddrinfo failed: Name or service not known.

I had the same issue happening sporadically on my local server with a number of attempted fixes yielding no resolution. This post here gave me an idea that seems to have finally fixed the problem.
Basically, I have a number of vhosts set up on my local machine (running Ubuntu) which allows me to use domain names to access locally-run sites instead of the usual 'localhost/sitename' approach. As a result, I had no IP assigned to 'localhost' name.
This might not be the same root cause for the problem for you, but here's how I've solved mine:
See what is the value of 'redis-host' in your redis config file
(for me it's set to 'localhost').
In your /etc/hosts file check
that there's an IP assigned to that host name. (In your case, where
redis-host is 127.0.0.1, check that there isn't some other host name
assigned to that IP, like phpmyadmin, for example.)
Of course, as a sanity check, make sure your redis-server is up and running, try rebooting Apache in case you've made any config changes, etc.

For mac users:
Open terminal and try this command:
sudo vi /etc/hosts (sudo to execute the command as a root user,
You have enter the password for this)
press 'i' to get into input mode of VI editor
Add this line at the end 127.0.0.1 redis
press esc to go to command mode
type :wq (to save and quit the vi
editor)

In my case, the issue was simple; the host name was incorrectly typed.
To find out the exact issue, I had to do the following in my console:
ping <host-name>
or if you have redis-cli installed, you can just call that from the console as such:
redis-cli -h <host-name> -p <port-number> -a <auth-pass>
Source

Related

EPSO CRM 500 error, Log Says file not found [duplicate]

I'm trying to set up WordPress. I have Apache and MySQL running, and the accounts and database are all set up. I tried to make a simple connection:
<?php
$conn = mysql_connect('localhost', 'USER', 'PASSWORD');
if(!$conn) {
echo 'Error: ' . mysql_errno() . ' - ' . mysql_error();
}
?>
And I always get this:
Error: 2002 - No such file or
directory
What file or directory could it be talking about?
I'm on a OS X Snow Leopard, using the built-in Apache. I installed MySQL using the x86_64 dmg.
UPDATE: I found that the socket is at /tmp/mysql.sock, so In php.ini, I replaced all occurrences of the wrong path with that.

I had a similar problem and was able to solve it by addressing my mysql with 127.0.0.1 instead of localhost.
This probably means I've got something wrong in my hosts setup, but this quick fix get's me going for right now.

If you use Linux: the path to the mysql.sock file is wrong. This is usually because you are using (LAMPP) XAMPP and it isn't in /tmp/mysql.sock
Open the php.ini file and find this line:
mysql.default_socket
And make it
mysql.default_socket = /path/to/mysql.sock

This is for Mac OS X with the native installation of Apache HTTP and custom installation of MySQL.
The answer is based on #alec-gorge's excellent response, but since I had to google some specific changes to have it configured in my configuration, mostly Mac OS X-specific, I thought I'd add it here for the sake of completeness.
Enable PHP5 support for Apache HTTP
Make sure the PHP5 support is enabled in /etc/apache2/httpd.conf.
Edit the file with sudo vi /etc/apache2/httpd.conf (enter the password when asked) and uncomment (remove ; from the beginning of) the line to load the php5_module module.
LoadModule php5_module libexec/apache2/libphp5.so
Start Apache HTTP with sudo apachectl start (or restart if it's already started and needs to be restarted to re-read the configuration file).
Make sure that /var/log/apache2/error_log contains a line that tells you the php5_module is enabled - you should see PHP/5.3.15 (or similar).
[notice] Apache/2.2.22 (Unix) DAV/2 PHP/5.3.15 with Suhosin-Patch configured -- resuming normal operations
Looking up Socket file's name
When MySQL is up and running (with ./bin/mysqld_safe) there should be debug lines printed out to the console that tell you where you can find the log files. Note the hostname in the file name - localhost in my case - that may be different for your configuration.
The file that comes after Logging to is important. That's where MySQL logs its work.
130309 12:17:59 mysqld_safe Logging to '/Users/jacek/apps/mysql/data/localhost.err'.
130309 12:17:59 mysqld_safe Starting mysqld daemon with databases from /Users/jacek/apps/mysql/data
Open the localhost.err file (again, yours might be named differently), i.e. tail -1 /Users/jacek/apps/mysql/data/localhost.err to find out the socket file's name - it should be the last line.
$ tail -1 /Users/jacek/apps/mysql/data/localhost.err
Version: '5.5.27' socket: '/tmp/mysql.sock' port: 3306 MySQL Community Server (GPL)
Note the socket: part - that's the socket file you should use in php.ini.
There's another way (some say an easier way) to determine the location of the socket's file name by logging in to MySQL and running:
show variables like '%socket%';
Configuring PHP5 with MySQL support - /etc/php.ini
Speaking of php.ini...
In /etc directory there's /etc/php.ini.default file. Copy it to /etc/php.ini.
sudo cp /etc/php.ini.default /etc/php.ini
Open /etc/php.ini and look for mysql.default_socket.
sudo vi /etc/php.ini
The default of mysql.default_socket is /var/mysql/mysql.sock. You should change it to the value you have noted earlier - it was /tmp/mysql.sock in my case.
Replace the /etc/php.ini file to reflect the socket file's name:
mysql.default_socket = /tmp/mysql.sock
mysqli.default_socket = /tmp/mysql.sock
Final verification
Restart Apache HTTP.
sudo apachectl restart
Check the logs if there are no error related to PHP5. No errors means you're done and PHP5 with MySQL should work fine. Congrats!

Restarting the mysql server might help. In my case, restarting the server saved a lot of time.
service mysql restart
P.S.- use sudo service mysql restart for non-root user.

Replacing 'localhost' to '127.0.0.1' in config file (db connection) helped!

First, ensure MySQL is running. Command: mysqld start
If you still cannot connect then:
What does your /etc/my.cnf look like? (or /etc/msyql/my.cnf)
The other 2 posts are correct in that you need to check your socket because 2002 is a socket error.
A great tutorial on setting up LAMP is: http://library.linode.com/lamp-guides/centos-5.3/index-print

Expanding on Matthias D's answer here I was able to resolve this 2002 error on both MySQL and MariaDB with exact paths using these commands:
First get the actual path to the MySQL socket:
netstat -ln | grep -o -m 1 '/.*mysql.sock'
Then get the PHP path:
php -r 'echo ini_get("mysql.default_socket") . "\n";'
Using the output of these two commands, link them up:
sudo ln -s /actualpath/mysql.sock /phppath/mysql.sock
If that returns No such file or directory you just need to create the path to the PHP mysql.sock, for example if your path was /var/mysql/mysql.sock you would run:
sudo mkdir -p /var/mysql
Then try the sudo ln command again.

Not that it helps you much, but in the recent versions (and even less recent) of MySQL, error code 2002 means “Can't connect to local MySQL server through socket [name-of-socket]”, so that might tell you a bit more.

I'd check your php.ini file and verify the mysql.default_socket is set correctly and also verify that your mysqld is correctly configured with a socket file it can access. Typical default is "/tmp/mysql.sock".

I encountered this problem too, then i modified 'localhost' to '127.0.0.1',it works.

in my case I have problem with mysqli_connect.
when I want to connect
mysqli_connect('localhost', 'myuser','mypassword')
mysqli_connect_error() return me this error "No such file or directory"
this worked for me
mysqli_connect('localhost:3306', 'myuser','mypassword')

The error 2002 means that MySQL can't connect to local database server through the socket file (e.g. /tmp/mysql.sock).
To find out where is your socket file, run:
mysql_config --socket
then double check that your application uses the right Unix socket file or connect through the TCP/IP port instead.
Then double check if your PHP has the right MySQL socket set-up:
php -i | grep mysql.default_socket
and make sure that file exists.
Test the socket:
mysql --socket=/var/mysql/mysql.sock
If the Unix socket is wrong or does not exist, you may symlink it, for example:
ln -vs /Applications/MAMP/tmp/mysql/mysql.sock /var/mysql/mysql.sock
or correct your configuration file (e.g. php.ini).
To test the PDO connection directly from PHP, you may run:
php -r "new PDO('mysql:host=localhost;port=3306;charset=utf8;dbname=dbname', 'root', 'root');"
Check also the configuration between Apache and CLI (command-line interface), as the configuration can be differ.
It might be that the server is running, but you are trying to connect using a TCP/IP port, named pipe, or Unix socket file different from the one on which the server is listening. To correct that you need to invoke a client program (e.g. specifying --port option) to indicate the proper port number, or the proper named pipe or Unix socket file (e.g. --socket option).
See: Troubleshooting Problems Connecting to MySQL
Other utils/commands which can help to track the problem:
mysql --socket=$(php -r 'echo ini_get("mysql.default_socket");')
netstat -ln | grep mysql
php -r "phpinfo();" | grep mysql
php -i | grep mysql
Use XDebug with xdebug.show_exception_trace=1 in your xdebug.ini
On OS X try sudo dtruss -fn mysqld, on Linux debug with strace
Check permissions on Unix socket: stat $(mysql_config --socket) and if you've enough free space (df -h).
Restart your MySQL.
Check net.core.somaxconn.

Make sure your local server (MAMP, XAMPP, WAMP, etc..) is running.

May be I am late to answer this, but what solved my problem was to install the mysql-server
sudo apt-get install mysql-server
after spending more than 5 hours I found this solution which helped me to proceed.
I hope this would help someone if the top answers won't help them

by using 127.0.0.1 insteady of localhost solve the problem

Digital Ocean MySql 2002-no-such-file-or-directory
Add this end of file /etc/mysql/my.cnf
[mysqld]
innodb_force_recovery = 1
Restart MySql
service mysql restart

First check MySQL server is running or not. if running then check socket path by login to MySQL through command line.
mysql -uUSER -pPASSWORD
then
show variables like 'socket';
You'll find path of mysql socket which you can use further in connection string like below:
$conn = mysqli_connect('localhost', 'USER', 'PASSWORD', 'path of
socket file');
If MySQL is not running. Then Please share error logs which you are getting to troubleshoot further.

I had a similar problem.
Basically here the problem is there are probably two instances of mysql running.
A) One running at /etc/init.d
B) Lamp being installed at /opt/lamp
Solution :
Step 1 :- Find all mysql running instances using commnad "find / | grep mysqld"
Step 2 :- Shutdown the services running at /etc/init.d using service mysql stop
Step 3 :- Restart your Lamp services using /opt/lamp/lamp restart
You should be good to go :)

On a Mac, before doing all the hard work, simply check your settings in System Preferences > MySQL. More often than not, I've experienced the team running into this problem since The MySQL Server Instance is stopped.
Click the Start MySQL Server button, and magic will happen.

Im using PHP-FPM or multiple php version in my server. On my case i update mysqli value since there is not mysql default socket parameter :
mysqli.default_socket
to :
mysql.default_socket = /path/to/mysql.sock
thanks to #Alec Gorge

I had the same problem. My socket was eventually found in /tmp/mysql.sock. Then I added that path to php.ini. I found the socket there from checking the page "Server Status" in MySQL Workbench. If your socket isn't in /tmp/mysql.sock then maybe MySQL Workbench could tell you where it is? (Granted you use MySQL Workbench...)

I've installed MySQL using installer. In fact, there was no data directory alongside 'bin' directory.
So, I manually created the 'data' directory under "C:\Program Files\MySQL\MySQL Server 8.0". And it worked (changing the root password following steps suggested on https://dev.mysql.com/doc/mysql-windows-excerpt/5.7/en/resetting-permissions-windows.html.

enable and start mariadb service
sudo systemctl enable mariadb.service
sudo systemctl start mariadb.service

No such file or directory [duplicate]

I'm trying to set up WordPress. I have Apache and MySQL running, and the accounts and database are all set up. I tried to make a simple connection:
<?php
$conn = mysql_connect('localhost', 'USER', 'PASSWORD');
if(!$conn) {
echo 'Error: ' . mysql_errno() . ' - ' . mysql_error();
}
?>
And I always get this:
Error: 2002 - No such file or
directory
What file or directory could it be talking about?
I'm on a OS X Snow Leopard, using the built-in Apache. I installed MySQL using the x86_64 dmg.
UPDATE: I found that the socket is at /tmp/mysql.sock, so In php.ini, I replaced all occurrences of the wrong path with that.

I had a similar problem and was able to solve it by addressing my mysql with 127.0.0.1 instead of localhost.
This probably means I've got something wrong in my hosts setup, but this quick fix get's me going for right now.

If you use Linux: the path to the mysql.sock file is wrong. This is usually because you are using (LAMPP) XAMPP and it isn't in /tmp/mysql.sock
Open the php.ini file and find this line:
mysql.default_socket
And make it
mysql.default_socket = /path/to/mysql.sock

Restarting the mysql server might help. In my case, restarting the server saved a lot of time.
service mysql restart
P.S.- use sudo service mysql restart for non-root user.

Replacing 'localhost' to '127.0.0.1' in config file (db connection) helped!

First, ensure MySQL is running. Command: mysqld start
If you still cannot connect then:
What does your /etc/my.cnf look like? (or /etc/msyql/my.cnf)
The other 2 posts are correct in that you need to check your socket because 2002 is a socket error.
A great tutorial on setting up LAMP is: http://library.linode.com/lamp-guides/centos-5.3/index-print

Expanding on Matthias D's answer here I was able to resolve this 2002 error on both MySQL and MariaDB with exact paths using these commands:
First get the actual path to the MySQL socket:
netstat -ln | grep -o -m 1 '/.*mysql.sock'
Then get the PHP path:
php -r 'echo ini_get("mysql.default_socket") . "\n";'
Using the output of these two commands, link them up:
sudo ln -s /actualpath/mysql.sock /phppath/mysql.sock
If that returns No such file or directory you just need to create the path to the PHP mysql.sock, for example if your path was /var/mysql/mysql.sock you would run:
sudo mkdir -p /var/mysql
Then try the sudo ln command again.

Not that it helps you much, but in the recent versions (and even less recent) of MySQL, error code 2002 means “Can't connect to local MySQL server through socket [name-of-socket]”, so that might tell you a bit more.

I'd check your php.ini file and verify the mysql.default_socket is set correctly and also verify that your mysqld is correctly configured with a socket file it can access. Typical default is "/tmp/mysql.sock".

I encountered this problem too, then i modified 'localhost' to '127.0.0.1',it works.

in my case I have problem with mysqli_connect.
when I want to connect
mysqli_connect('localhost', 'myuser','mypassword')
mysqli_connect_error() return me this error "No such file or directory"
this worked for me
mysqli_connect('localhost:3306', 'myuser','mypassword')

The error 2002 means that MySQL can't connect to local database server through the socket file (e.g. /tmp/mysql.sock).
To find out where is your socket file, run:
mysql_config --socket
then double check that your application uses the right Unix socket file or connect through the TCP/IP port instead.
Then double check if your PHP has the right MySQL socket set-up:
php -i | grep mysql.default_socket
and make sure that file exists.
Test the socket:
mysql --socket=/var/mysql/mysql.sock
If the Unix socket is wrong or does not exist, you may symlink it, for example:
ln -vs /Applications/MAMP/tmp/mysql/mysql.sock /var/mysql/mysql.sock
or correct your configuration file (e.g. php.ini).
To test the PDO connection directly from PHP, you may run:
php -r "new PDO('mysql:host=localhost;port=3306;charset=utf8;dbname=dbname', 'root', 'root');"
Check also the configuration between Apache and CLI (command-line interface), as the configuration can be differ.
It might be that the server is running, but you are trying to connect using a TCP/IP port, named pipe, or Unix socket file different from the one on which the server is listening. To correct that you need to invoke a client program (e.g. specifying --port option) to indicate the proper port number, or the proper named pipe or Unix socket file (e.g. --socket option).
See: Troubleshooting Problems Connecting to MySQL
Other utils/commands which can help to track the problem:
mysql --socket=$(php -r 'echo ini_get("mysql.default_socket");')
netstat -ln | grep mysql
php -r "phpinfo();" | grep mysql
php -i | grep mysql
Use XDebug with xdebug.show_exception_trace=1 in your xdebug.ini
On OS X try sudo dtruss -fn mysqld, on Linux debug with strace
Check permissions on Unix socket: stat $(mysql_config --socket) and if you've enough free space (df -h).
Restart your MySQL.
Check net.core.somaxconn.

Make sure your local server (MAMP, XAMPP, WAMP, etc..) is running.

May be I am late to answer this, but what solved my problem was to install the mysql-server
sudo apt-get install mysql-server
after spending more than 5 hours I found this solution which helped me to proceed.
I hope this would help someone if the top answers won't help them

by using 127.0.0.1 insteady of localhost solve the problem

Digital Ocean MySql 2002-no-such-file-or-directory
Add this end of file /etc/mysql/my.cnf
[mysqld]
innodb_force_recovery = 1
Restart MySql
service mysql restart

First check MySQL server is running or not. if running then check socket path by login to MySQL through command line.
mysql -uUSER -pPASSWORD
then
show variables like 'socket';
You'll find path of mysql socket which you can use further in connection string like below:
$conn = mysqli_connect('localhost', 'USER', 'PASSWORD', 'path of
socket file');
If MySQL is not running. Then Please share error logs which you are getting to troubleshoot further.

I had a similar problem.
Basically here the problem is there are probably two instances of mysql running.
A) One running at /etc/init.d
B) Lamp being installed at /opt/lamp
Solution :
Step 1 :- Find all mysql running instances using commnad "find / | grep mysqld"
Step 2 :- Shutdown the services running at /etc/init.d using service mysql stop
Step 3 :- Restart your Lamp services using /opt/lamp/lamp restart
You should be good to go :)

On a Mac, before doing all the hard work, simply check your settings in System Preferences > MySQL. More often than not, I've experienced the team running into this problem since The MySQL Server Instance is stopped.
Click the Start MySQL Server button, and magic will happen.

Im using PHP-FPM or multiple php version in my server. On my case i update mysqli value since there is not mysql default socket parameter :
mysqli.default_socket
to :
mysql.default_socket = /path/to/mysql.sock
thanks to #Alec Gorge

I had the same problem. My socket was eventually found in /tmp/mysql.sock. Then I added that path to php.ini. I found the socket there from checking the page "Server Status" in MySQL Workbench. If your socket isn't in /tmp/mysql.sock then maybe MySQL Workbench could tell you where it is? (Granted you use MySQL Workbench...)

I've installed MySQL using installer. In fact, there was no data directory alongside 'bin' directory.
So, I manually created the 'data' directory under "C:\Program Files\MySQL\MySQL Server 8.0". And it worked (changing the root password following steps suggested on https://dev.mysql.com/doc/mysql-windows-excerpt/5.7/en/resetting-permissions-windows.html.

enable and start mariadb service
sudo systemctl enable mariadb.service
sudo systemctl start mariadb.service

PHP/mysql requiring 127.0.0.1 on OS X Mavericks

On Mac OS X 10.6, I am able to connect to mysql in php with
$mysql = mysql_connect(localhost,user,password)
However, if I use the same in Mac OS X 10.9 (Mavericks), I get the error message:
Warning: mysql_connect(): No such file or directory
if I use $mysql = mysql_connect("127.0.0.1",user,password), it works OK, but I'd rather not make the change everywhere.
I've read on this site that there is a socket issue, but I already have this in php.ini.default: pdo_mysql.default_socket=/tmp/mysql.sock
Any idea on how to make mysql_connect(localhost,user,password) work on 10.9 ?

Please read those articles:
http://www.coolestguidesontheplanet.com/downtown/get-apache-mysql-php-and-phpmyadmin-working-osx-109-mavericks
AllowOverride for .htaccess on local machine giving 403 Forbidden
http://coolestguidesontheplanet.com/how-to-install-mcrypt-for-php-on-mac-osx-lion-10-7-development-server/
http://michaelgracie.com/2013/10/29/plugging-mcrypt-into-php-on-mac-os-x-mavericks-10-9/

what you need is to edit the hostnames file, but I am a PC user, so I can't walk you with that on mac. Anyway here is what I found and I suppose it is the same as your OS version
Step 1 – Open the Terminal.app
Either by start typing Terminal on the Spotlight, or by going into
Applications -> Utilities -> Terminal.
Step 2 – Open the hosts file
Open the hosts by typing on the Terminal that you have just opened:
1$ sudo nano /private/etc/hosts Type your user password when
prompted.
Step 3 – Edit the hosts file
The hosts file contains some comments (lines starting with the #
symbol), as well as some default hostname mappings (e.g. 127.0.0.1 –
localhost).
source: http://decoding.wordpress.com/2009/04/06/how-to-edit-the-hosts-file-in-mac-os-x-leopard/
what you need is to write an entry for 127.0.0.1 - localhost
if it is not already there.

If you call mysql_connect() with localhost as a first argument PHP tries to connect using a UNIX domain socket instead of TCP.
Probably it looks for wrong socket name and/or you mysql only listens on TCP.
You should check your mysql settings (/etc/mysql ? search for socket) and the php mysql.default_socket config variable. (The pdo_mysql.default_socket you mentions is used when you connect using pdo.)
For example on my debian:
$ grep socket /etc/mysql/my.cnf
socket = /var/run/mysqld/mysqld.sock
(Otherwise your life would be easier if you use any kind of db abstraction layer, and storing the connection details only once.)

Mac OS X 10.8 MySQL connection error: localhost does not work, 127.0.0.1 all OK

I have now a new MabBook with 10.8 and I am trying to set up all the Apache & MySQL etc.
Apache successfully runs including vhosts.
In my /etc/hosts I have all the local hosts set including 127.0.0.1 localhost etc.
When I try to coennct to one of my local vhost, e.g. alpensonne, I can connect to MySQL without any troubles. If I try to have the MySQL host to be localhost, I get the follwoing error:
Database connection error (2): Could not connect to MySQL.
I know the error (2) means username or password incorrect, but they are fine.
If I connect with
mysql -u root
SELECT password,host FROM user where user='root';
Also I have just done to be double sure:
SET PASSWORD FOR 'root'#'localhost' = '';
Is it possible that localhost uses a different MySQL socket? Maybe it then tries to connect to a different MySQL?

Ok I found the mistake...
The problam was, that I have forgot to change the php.ini file to point to the mysql.default_socket...
My default_socket was set to /var/mysql/mysql.sock
so I just created a symlink to /tmp/mysql.sock and now all works fine! :)
#shadyyx
Thanks for the proposal of MAMP, I know this of course but not such a big fan of MAMP, XAMPP, LAMP etc. for windows user its good so you can use apache instead of IIS, but for Linux, Unix and also Mac user you can use the build in apache server... so no need to use an other third party software. also you are depended then on the php version etc. I like it more to be able to configure it myself.

To elaborate on the answer from #schurtertom...
The problem is that mysql.default_socket setting in PHP.INI defaults to a different location than where MySQL actually puts that file.
Instead of editing the config files, create an alias in the location that PHP is looking that connects to the real mysql.sock by running these two commands (no restart needed):
mkdir /var/mysql
ln -s /tmp/mysql.sock /var/mysql/mysql.sock

With MySQL from MacPorts it works with this path:
mysql.default_socket = /opt/local/var/run/mysql56/mysqld.sock

In case MySQL still does not connected, run:
brew switch openssl 1.0.2s

MySQL working with 127.0.0.1 but not working with localhost?

I have a strange problem in php MySQL:
php connects with 127.0.0.1 but not with localhost.
How to solve this issue?

Try ping localhost in a command line, it may be resolving to ::1: the IP6 equivalent to 127.0.0.1
To fix it, add (or uncomment) the line:
127.0.0.1 localhost
in C:\WINDOWS\system32\drivers\etc\hosts

localhost must be defined in your hosts file, which it is by default on Windows and most OSs.
Check the following text file and see what's up:
C:\WINDOWS\system32\drivers\etc\hosts
Please note "hosts" is the file, no extension, it's not a folder. This file should be pretty much empty, if you see entries either your AV/spam blocker added a ton of entries that point to 127.0.0.1 or nasty malware has written garbage in there, despite, newer entries are below older ones. Localhost should be the first entry in that file.

For macs, here's the solution:
Connect to MySQL using localhost instead of 127.0.0.1 on a MAC. For a long while now I’ve been connecting to MySQL on my development platform with 127.0.0.1 because for some reason localhost didn’t work. Turns out it’s because 127.0.0.1 uses TCP/IP and localhost uses sockets. The php.ini file points to the wrong place for the mysql.sock so all you have to do is change it, restart apache and voila!
Open php.ini: /private/etc/php.ini
Find the following line: mysql.default_socket = /var/mysql/mysql.sock
Replace with: mysql.default_socket = /tmp/mysql.sock
Restart apache: apachectl restart
Note: Depending on your setup, you may also have to update these lines in your php.ini:
mysqli.default_socket = /tmp/mysql.sock
pdo_mysql.default_socket = /tmp/mysql.sock
Note: If you don’t have a php.ini file, you need to copy the provided default called php.ini.default
sudo cp /private/etc/php.ini.default /private/etc/php.ini
via http://madproject.com/general/connect-to-mysql-using-localhost-instead-of-127-0-0-1-on-a-mac/

Also have a look inside the mysql database which defines the user access privileges. You can define there from which source hosts a given user is allowed to connect. You can consult http://dev.mysql.com/doc/refman/5.1/en/connection-access.html for more details

I remember that being a longstanding and documented feature of Mysql on Windows. Something about the way local sockets work or something.

Try:
IE-->Tools-->Options--> Connection --> LAN Settings Check Bypass Proxy for local addresses

If MySQL connects to 127.0.0.1 it does so via TCP/IP whereas if it connects to localhost it does so via a socket.
Is PHP looking in the right place for mysql.sock? Make sure php.ini and my.conf have matching locations

Is localhost resolving to the IPv6 address, as opposed to the IPv4, and MySQL is not listening on the v4 address?
The solution is make localhost resolve to the v4 address, OR make MySQL listen on the v6 address.

If you not on windows also test if mysql is connecting via socket, locally it normally does.
Force tcp with the mysql client
mysql -usomeone -p --protocol=TCP
vs. socket (default on linux)
mysql -usomeone -p
mysql -usomeone -p --protocol=socket
The latter didn't work for my someone#127.0.0.1

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