Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Question

I am getting the following error when I try to connect to mysql:

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Is there a solution for this error? What might be the reason behind it?

Answer 1

please use socket detail if you are not using default socket path.

for mariadb

mariadb-secure-installation --socket=/u002/mysql/data/mysql.sock

for mysql

mysql-secure-installation --socket=/u002/mysql/data/mysql.sock

Answer 2

so it tells you that they cannot find the socket file at '/var/lib/mysql/mysql.sock'

what you'll do is you need to connect the mysql.sock file to it most probably it is at /tmp/mysql.sock if the file doesn' exist create it using

touch /tmp/mysql.sock

and then execute

sudo ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock

note if there is no mysql directory inside /var/lib create it

mkdir mysql

refresh your app

Answer 3

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' it can be solve by two way

1. using short link
2. mention socket file link in the client and server file.

Method 1: To do link you can use

ln -s /data/mysql_datadir/mysql.sock /var/lib/mysql/mysql.sock

Method 2: To mention socket file for client and server, you need to set socket file path like below for both client and server file. server file name could be server.cnf and client file name could be client.cnf. Inside that file you will find a section like [client] or [server] . You have to put update socket file path for both server and client to communicate..

client.cnf

[client]
socket=/mydata/db/mysql/mysql.sock

server.cnf

[server]
socket=/mydata/db/mysql/mysql.sock

My preference instead of method-1 use method-2. Because link is a dependent file if somehow it is deleted then you will get trouble. Since you know better option that link you should use it.

Answer 4

I'm using MyXQL to access the database in Elixir. My actual error was using /tmp/mysql.sock, when the /etc/my.conf was using /var/lib/mysql/mysql.sock.

The solution for me was to set an environment variable in the Elixir setup:
export MYSQL_UNIX_PORT=/var/lib/mysql/mysql.sock so that MyXQL would not use its default location.

The principle of this solution is that you can redirect MyXQL to another location to avoid this type of problem.

Answer 5

Navicat15: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

Ubuntu16.04, if mysql server is running and the configure in /etc/mysql like this:

[mysqld] socket = /var/run/mysqld/mysqld.sock

Then Navicat15 localhost default setting is: "/var/lib/mysql/mysql.sock"

You can edit in advance like this:

Answer 6

I don't find any solutions from all the answers above, I do have mariadb installation that was installed from source in Debian 11 (not from Debian apt package). So whenever I trigger mysql command in terminal, I will get this error:

ERROR 2002 (HY000): Can't connect to local server through socket '/run/mysqld/mysqld.sock' (2)

and the mysql error log only shows the same error socket above which was hard for me to know the reason behind this

What I did was to remove mailutils package in my distro that has mariadb dependencies files in it.

So, I just need to trigger these 2 commands

apt -y remove mailutils
apt -y autoremove

and when I run mysql command in terminal, I don't have that socket error anymmore

Answer 7

I came to this issue when i reinstall mariadb with yum, which rename my /etc/my.cnf.d/client.cnf to /etc/my.cnf.d/client.cnf.rpmsave but leave /etc/my.cnf unchanged.

For I has configed mysqld's socket in /etc/my.cnf, and mysql's socket in /etc/my.cnf.d/client.cnf with customized path.

So after the installation, mysql client cannot find the mysql's socket conf, so it try to use the default socket path to connect the msyqld, which will cause this issue.

Here are some steps to locate this isue.

1. check if mysqld is running with ps -aef | grep mysqld

$ps -aef | grep mysqld | grep -v grep
mysql    19946     1  0 09:54 ?        00:00:03 /usr/sbin/mysqld

2. if mysqld is running, show what socket it use with netstat -ln | grep mysql

$netstat -ln | grep mysql
unix  2      [ ACC ]     STREAM     LISTENING     560340807 /data/mysql/mysql.sock

3. check if the socket is mysql client trying to connect. if not, edit /etc/my.conf.d/client.cnf or my.conf to make the socket same with it in mysqld

[client]
socket=/data/mysql/mysql.sock

You also can edit the mysqld's socket, but you need to restart or reload mysqld.

Answer 8

I have the same problem and when I digged into the log:

sudo tail -f /var/log/mysqld.log

InnoDB: mmap(137363456 bytes) failed; errno 12
200610  6:27:27 InnoDB: Completed initialization of buffer pool
200610  6:27:27 InnoDB: Fatal error: cannot allocate memory for the buffer pool
200610  6:27:27 [ERROR] Plugin 'InnoDB' init function returned error.
200610  6:27:27 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
200610  6:27:27 [ERROR] Unknown/unsupported storage engine: InnoDB
200610  6:27:27 [ERROR] Aborting

Clearly there's not enough memory and stopping InnoDB to start. I realized I never set up the swap file...

I followed this to set up the swap file and it works.

Answer 9

In my case, I was importing a new database, and I wasnt able to connect again after that. Finally I realized that was a space problem.

So you can delete the last database and expand you hard drive or what I did, restored a snapshot of my virtual machine.

Just in case someone thinks that is useful

Answer 10

Check if your mysqld service is running or not, if not run, start the service.

If your problem isn't solved, look for /etc/my.cnf and modify as following, where you see a line starting with socket. Take a backup of that file before doing this update.

socket=/var/lib/mysql/mysql.sock  

Change to

socket=/opt/lampp/var/mysql/mysql.sock -u root

Answer 11

Make sure you have enough space left in /var. If Mysql demon is not able to write additional info to the drive the mysql server won't start and it leads to the error Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Consider using

expire_logs_days = 10
max_binlog_size = 100M

This will help you keep disk usage down.

Answer 12

MariaDB, a community developed fork of MySQL, has become the default implementation of MySQL in many distributions.

So first you should start,

$ sudo systemctl start mariadb

If this fails rather try,

$ sudo systemctl start mysqld

Then to start mysql,

$ mysql -u root -p

---

As of today, in Fedora the package is named mariadb And in Ubuntu it is called mariadb-server.

So you may have to install it if its not already installed in your system.

Answer 13

If you are on a recent RHEL, you may need to start mariadb (an open source mysql db) instead of the mysql db:

yum remove mysql
yum -y install mariadb-server mariadb
service mariadb start

You should then be able to access mysql in the usual fashion:

mysql -u root -p

Answer 14

This might be a stupid suggestion but make 100% sure your DB is still hosted at localhost. For example, if a Network Admin chose (or changed to) Amazon DB hosting, you will need that hostname instead!

Answer 15

If you are in the shell of sf.net, try:

mysql --host=mysql-{LETTER} --user={LETTER}{GROUP ID}admin -p

Change {LETTER} and {GROUP ID} as shown in your MySQL Database of project admin profile.

Answer 16

if you change files in /var/lib/mysql [ like copy or replace that ], you must set owner of files to mysql this is so important if mariadb.service restart has been faild

chown -R mysql:mysql /var/lib/mysql/*

chmod -R 700 /var/lib/mysql/*

Answer 17

Please ensure you have installed MySQL server correctly, I met this error many times and I think it's complicated to debug from the socket, I mean it might be easier to reinstall it.

If you are using CentOS 7, here is the correct way to install it:

First of all, add the mysql community source
yum install http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm

Then you can install it by yum install mysql-community-server

Start it with systemctl: systemctl start mysqld

Answer 18

Here's what worked for me:

ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
service mysqld restart

Answer 19

Try first 2, 3 solutions. Error is stil popup & If you can not find /var/lib/mysql/mysql.sock

find /var/ -name mysql.sock

Check the space available in /var/

df

If the directory is full remove some unusefull files/directories

rm /var/cache/*

Probably your issue will sorted now.

Answer 20

One way to reproduce this error: If you meant to connect to a foreign server but instead connect to the non existent local one:

eric@dev ~ $ mysql -u dev -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through 
socket '/var/lib/mysql/mysql.sock' (2)
eric@dev ~ $

So you have to specify the host like this:

eric@dev ~ $ mysql --host=yourdb.yourserver.com -u dev -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 235
Server version: 5.6.19 MySQL Community Server (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+-------------------------+
| Database                |
+-------------------------+
| information_schema      |
| mysql                   |
| performance_schema      |
+-------------------------+
3 rows in set (0.00 sec)

mysql> exit
Bye
eric@dev ~ $

Answer 21

I had to disable explicit_defaults_for_timestamp from my.cnf.

Answer 22

Ensure that your mysql service is running

service mysqld start

Then, try the one of the following following:

(if you have not set password for mysql)

mysql -u root

if you have set password already

mysql -u root -p

Answer 23

Make sure you started the server:

mysql.server start

Then connect with root user:

mysql -uroot

Answer 24

This is a problem if you are running out of disk space. Solution is to free some space from the HDD.

Please read more to have the explanation :

If you are running MySQL at LINUX check the free space of HDD with the command disk free :

 df 

if you are getting something like that :

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2              5162828   4902260         0 100% /
udev                    156676        84    156592   1% /dev
/dev/sda3              3107124     70844   2878444   3% /home

Then this is the problem and now you have the solution!

Since mysql.sock wants to be created at the mysql folder which is almost always under the root folder could not achieve it because lack of space.

If you are periodicaly give the ls command under the mysql directory (at openSUSE 11.1 is at /var/lib/mysql) you will get something like :

hostname:/var/lib/mysql #
.protected  IT     files        ibdata1             mysqld.log  systemtemp
.tmp        NEWS   greekDB      mysql               mysqld.pid  test
ARXEIO      TEMP1  ib_logfile0  mysql.sock          polis
DATING      deisi  ib_logfile1  mysql_upgrade_info  restore

The mysql.sock file appearing and disappearing often (you must to try allot with the ls to hit a instance with the mysql.sock file on folder).

This caused by not enough disk space.

I hope that i will help some people!!!! Thanks!

Answer 25

It worked for me with the following changes

Whatever path for socket is mentioned in [mysqld] and same in [client] in my.cnf and restart mysql

[mysqld] socket=/var/lib/mysql/mysql.sock

[client] socket=/var/lib/mysql/mysql.sock

Answer 26

Just edit /etc/my.cnf Add following lines to my.cnf

[mysqld]

socket=/var/lib/mysql/mysql.sock 

[client]

socket=/var/lib/mysql/mysql.sock

Restart mysql and connect again

mysql -u user -p password database -h host;

Answer 27

ran into this issue while trying to connect mysql in SSH client, found adding the socket path to the command helpful when switching between sockets is necessary.

> mysql -u user -p --socket=/path/to/mysql5143.sock

Answer 28

In my case I have moved socket file to another location inside /etc/my.cnf from /var/lib/mysql/mysql.sock to /tmp/mysql.sock

Even after restarting the mysqld service, I still see the error message when I try to connect. ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

The problem is with the way that the client is configured. Running diagnostics will actually show the correct socket path. eg ps aux | grep mysqld

Works:

mysql -uroot -p -h127.0.0.1
mysql -uroot -p --socket=/tmp/mysql.sock

Does not Work:

mysql -uroot -p
mysql -uroot -p -hlocalhost

You can fix this problem by adding the same socket line under [client] section inside mysql config.

Answer 29

Note that while mysql reads the info of the location of the socketfile from the my.cnf file, the mysql_secure_installation program seems to not do that correctly at times.

So if you are like me and shuffle things around at installationtime you might get into the situation where you can connect to the database with mysql just fine, but the thing can not be secured (not using that script anyway).

To fix this the suggestion from sreddy works well: make a softlink from where the script would expect the socket to where it actually is. Example:

ln -s /tmp/mysql.sock /var/lib/mysql/mysql.sock

(I use /tmp/ as a default location for sockets)

Answer 30

My problem was that I installed mysql successfully and it worked fine.

But one day, the same error occurred.

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

And no mysql.sock file existed.

This sollution solved my problem and mysql was up and running again:

Log in as root:

sudo su -

Run:

systemctl stop mysqld.service
systemctl start mysqld.service
systemctl enable mysqld.service

Test as root:

mysql -u root -p

mysql should now be up and running.

I hope this can help someone else as well.