问题
I have installed Centos7 update, removed MariaDB and done a fresh install of MySQL - additionally I have removed it and reinstalled it but everytime I connect to mysql -u root -p I get the titled error. Additionally I have looked at other tickets associated with this but still not making progress. If I run service mysqld restart it says "Redirecting to /bin/systemctl restart mysqld.service" and then just hangs. Really not a linux expert so not sure what is causing this?
回答1:
I had the same problem and found out a few things after digging around. MariaDB is a drop-in replacement for mysql. On the new system, mysql is the MariaDB client (although I'm not clear on what that means). I checked to see if the service was running:
service mysqld status
which indicated:
Redirecting to /bin/systemctl status mysqld.service mysqld.service Loaded: not-found (Reason: No such file or directory) Active: inactive (dead)
In other words, the mysqld service is not running.
Starting the service worked for me:`systemctl start mariadb.service`
Now all the mysql commands work as expected.
To tie the last knot, enable the service at boot:`systemctl enable mariadb.service`
回答2:
Check the 'socket=' entry in your /etc/my.cnf within the [mysqld] section:
[mysqld1]
socket = /tmp/mysql.sock1
An alternate method is to provide the '-hhost' & '-Pport' parameters to the 'mysqladmin' or 'mysql' commands, to avoid using the socket.
mysql -u user -hservername -P3006 -p -Dschema
mysqladmin -u user -p -hhostname -Pport
回答3:
Removing the dir fixed it - deleted the dir (with rm -rf "dir name") and then unintalled mysql "yum remove mysql mysql-server" then reinstalled "yum install mysql-server" and ran "service mysqld start"
If you have this problem with the start mysql service hanging - check the logs /var/log/mysqld.log as suggested by Jeremiah.
来源：https://stackoverflow.com/questions/26163704/error-2002-hy000-cant-connect-to-local-mysql-server-through-socket-var-lib