In CentOS7, can not start MySQL

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failed to start mariadb.service: unit not found.
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I want use MySQL on CentOS7. installed MySQL package using yum.

[root@node01 ~]# yum install mysql mysql-*

then,

[root@node01 ~]# systemctl start mysqld.service
Failed to issue method call: Unit mysqld.service failed to load: No such file or directory.

i can not execute MySQL. How can i solve this problem?

when you run

yum install mysql

command by default it installs mariadb not mysql. so try this following command

yum list installed | grep mariadb

if mariadb-server is missing try this following command

yum install mariadb-server

it installs the server package then start the service

systemctl start mariadb

or

service mariadb start

My issue is solved in this way. Thanks

Can't start MySQL on CentOS 7, Before you use mysql, you have to run through and initialize things using the command: /usr/bin/mysql_install_db. Now I want to start mysql use service mysqld start on centos7,but I got the follow error: OS: centos64 bit Redirecting to /bin/systemctl start mysqld.service Job for mysqld.service failed. See '

To check for the required packages, type the given command:

$ rpm -qa | grep mariadb

Output:

    mariadb-libs-5.5.44-2.el7.centos.x86_64
    mariadb-5.5.44-2.el7.centos.x86_64
    mariadb-devel-5.5.44-2.el7.centos.x86_64
    mariadb-server-5.5.44-2.el7.centos.x86_64

If the last package is absent, type the given commands:

$ sudo yum -y install mariadb-server

$ sudo systemctl start mariadb

$ cat /etc/redhat-release

Output:

CentOS Linux release 7.2.1511 (Core)

Cann't start MySQL on my Linux server with Centos 7 OS, I fixed this problem, so I want to answer it myself. If this self-answering behavior is not appropriate, please make comments below. Overall� 3. Starting MySQL and Checking its Status. MySQL does not automatically start right after the installation. Therefore, you need to start it manually through the following command: sudo systemctl start mysqld; You will get no response once MySQL starts so to check if it is working properly, use the command below: sudo systemctl status mysqld

Check /etc/init.d/ for your mysql service name and then

service mysql_service_name start

On centos it is either: service mysqld start or for MariaDB: service mariadb start

In CentOS7, can not start MySQL, installed MySQL package using yum. then, [root@node01 ~]# systemctl start mysqld. service Failed to issue method call: Unit mysqld. Next, set MySQL to start whenever the server boots up with the following command: sudo systemctl enable mysqld Note: If you ever want to change this behavior and disable MySQL from starting up at boot, you can do so by running: sudo systemctl disable mysqld MySQL is now installed, running, and enabled on your server.

mysql-community-common appears to be installed along with Red Hat-based *nix v7 installs and it in turn conflicts with mariadb installation. I'm using Oracle Linux 7, just ran into this. After a fresh install of OL7, mysql-community-common and mysql-community-libs are installed. Remove mysql-community-common THEN install mariadb and everything works like a champ.

root@ol7-101:~> yum list installed | grep mysql
mysql-community-common.x86_64       5.6.27-2.el7                   @Server-Mysql/7.2
mysql-community-libs.x86_64         5.6.27-2.el7                   @Server-Mysql/7.2
root@ol7-101:~>

root@ol7-101:~> yum install mariadb-server mariadb -y
Loaded plugins: ulninfo
Resolving Dependencies
--> Running transaction check    
[...]

86_64 conflicts with file from package mysql-community-common-5.6.27-2.el7.x86_64
  file /usr/share/mysql/spanish/errmsg.sys from install of MariaDB-server-10.1.11-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.6.27-2.el7.x86_64
  file /usr/share/mysql/swedish/errmsg.sys from install of MariaDB-server-10.1.11-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.6.27-2.el7.x86_64
  file /usr/share/mysql/ukrainian/errmsg.sys from install of MariaDB-server-10.1.11-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.6.27-2.el7.x86_64
  file /usr/share/mysql/errmsg-utf8.txt from install of MariaDB-server-10.1.11-1.el7.centos.x86_64 conflicts with file from package mysql-community-common-5.6.27-2.el7.x86_64

Error Summary
-------------

root@ol7-101:~> systemctl start mariadb
Failed to start mariadb.service: Unit mariadb.service failed to load: No such file or directory.

root@ol7-101:~> systemctl enable mariadb.service
Failed to execute operation: Access denied
root@ol7-101:~>

root@ol7-101:~> yum erase mysql-community-common.x86_64
Loaded plugins: ulninfo
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-common.x86_64 0:5.6.27-2.el7 will be erased
--> Finished Dependency Resolution
[...]    

root@ol7-101:~> yum install mariadb  mariadb-libs mariadb-server -y
Loaded plugins: ulninfo
Resolving Dependencies
--> Running transaction check    
[...]

Complete!

root@ol7-101:~> systemctl start mariadb.service
root@ol7-101:~>
root@ol7-101:~> systemctl enable mariadb.service
Created symlink from /etc/systemd/system/multi-user.target.wants/mariadb.service to /usr/lib/systemd/system/mariadb.service.
root@ol7-101:~>

Can't start mysqld - CentOS, Although I had tried to re-install mysql-server-4.1.7 and related rpms many times, I couldn't start mysqld by gui services panel or # chkconfig� I have installed MySQL on my CentOS 7 server, but it won’t start. When i try to start it with the command “sudo service mysqld start” i get the message “Job for mysqld.service failed. See ‘systemctl status mysqld.service’ and 'journalctl -xn’ for details.” after about 5 minutes.

CentOS7 use mariaDB replaced Mysql, you can use mariaDB as same as Mysql. Or you can download repo from mysql.com. And then you can install mysql

MySQL service not running on CentOS 7 system, MySQL service not starting on a CentOS 7 system. ls: cannot access /var/run/ mariadb/mariadb.pid: No such file or directory. I didn't see any� I had copied the contents of the /var/lib/mysql directory from the hard drive of the prior CentOS 5 system to the new CentOS 7 system to have all of the databases from the old system available on the new system, so that appeared to be the reason that the mysql_secure_installation, which can be found in /usr/bin, did not accept my just hitting

MySQL Bugs: #82049: MySQL Community fails to start on CentOS 7, Description: When MySQL Community 5.7 is installed on a fresh server but using an existing my.cnf where datadir is not specified, initialize fails� If you forget your root MySQL password, it can be reset. Stop the current MySQL server instance, then restart it with an option to not ask for a password. sudo systemctl stop mysqld sudo mysqld_safe --skip-grant-tables & Reconnect to the MySQL server with the MySQL root account. mysql -u root Use the following commands to reset root’s password.

How to Install MySQL on CentOS 7, If no error or mismatch occurs, enter y . sudo yum install mysql-server sudo systemctl start mysqld. MySQL will bind to localhost (127.0.0.1)�

Useful Tips to Troubleshoot Common Errors in MySQL, If MySQL service fails to start, check its status using systemctl or use the journetctl (with the -xe flag) command under systemd to examine the problem. You can also examine system log file such as /var/log/messages or similar for reasons for your problem.

Comments
  • I think you have to use MariaDB instead of MySql.
  • if coming from an earlier version of MariaDB to MariaDB 10.4.x this answer here is a life saver.
  • I also have same configuration, but none of the mentioned method is working. I am getting this error in installing mariadb-server from above command, Package 1:mariadb-server-5.5.50-1.el7_2.x86_64 is obsoleted by mysql-community-server-5.7.16-1.el7.x86_64 which is already installed Nothing to do. What can I do??
  • I can add that in my case, mariadb-devel-5.5.44-2.el7.centos.x86_64 was not present, so I $ yum install -y mariadb-dev and it was able to start.
  • This function worked after logging in from super admin. Thanks!