The database used more specific nagging not directly mounted on the base operation mysql:
1, check whether the Linux installation mariadb database, mariadb mysql database is a branch of
Excuting an order:
yum list installed | grep mariadb
2, if Linux is installed in the mariadb database, uninstall first, because CentOS 7.6 integrates a mariadb, and then install mysql and will file conflicts mariadb, so you need to uninstall mariadb
Excuting an order:
yum -y remove mariadb-libs.x86_64
3, start the installation mysql, mysql first download the software compression package from the official website and upload it to the Linux opt / mysoft directory
Mysql extract the downloaded software compression package, execute the command:
tar -zxvf /opt/mysoft/mysql-5.7.24-linux-glibc2.12-x86_64.tar.gz -C /usr/local
4, will be renamed after extracting mysql-5.7.24-linux-glibc2.12-x86_64 to mysql-5.7.24 or mysql, this depends on personal habits, and unnecessary operations
Excuting an order:
mv mysql-5.7.24-linux-glibc2.12-x86_64 mysql-5.7.24
5, created in the mysql-5.7.24 folder directory / data / 3306 folder, this is also a matter of personal habit, and non-essential operations
Switch to 5.7-MySQL .24 directory, execute the command:
mkdir -vp ./data/3306 (v represents the creation of new directories are displayed information, p represents the recursive creation)
6, add a mysql user and group
Excuting an order:
groupadd mysql
MySQL useradd -g MySQL (-g: Specifies the user is set)
7, switch to the mysql-5.7.24 / bin directory execute:
./mysqld --initialize-insecure --user=mysql --datadir=/usr/local/mysql-5.7.24/data/3306 --basedir=/usr/local/mysql-5.7.24
（--initialize-insecure标识不设置密码， root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.）
8, in the mysql-5.7.24 / bin directory
Excuting an order:
. / Mysql_ssl_rsa_setup --datadir = / usr / local / MySQL 5.7.24-/ Data / 3306 (access of a secure connection, generates an RSA private key)
9, change mysql-5.7.24 entire folder directory permissions belongs
Excuting an order: chown -R & lt MySQL: MySQL /usr/local/mysql-5.7.24 (- R & lt recursive iteration represented) chmod: file / directory permissions command
1 0 create a my.cnf file in the mysql-5.7.24 / data / 3306 directory
Use the command: vim my.cnf [client] port = 3306 socket = /usr/local/mysql-5.7.24/data/3306/mysql.sock default-character-set=utf8 [mysqld] port = 3306 socket = /usr/local/mysql-5.7.24/data/3306/mysql.sock datadir = /usr/local/mysql-5.7.24/data/3306 log-error = /usr/local/mysql-5.7.24/data/3306/error.log pid-file = /usr/local/mysql-5.7.24/data/3306/mysql.pid character-set-server =utf8 # Whether to ignore case, lower_case_table_names the unix default value 0 .Windows default value is 1 (case-insensitive comparison name) .Mac OS X default value is 2 . lower_case_table_names = 1 # 0 indicates whether to automatically submit not automatically submit 1 means the automatic submission, mysql transaction support engine is InnoDB, in the case of default autocommit value of 1 autocommit = 1
At this point MySQL installation is complete;
11, start the MySQL service
In the mysql-5.7.24 / command in the bin directory:
. / File---defaults the mysqld_safe = / usr / local / MySQL 5.7.24-/ Data / 3306 / the my.cnf & (wherein the symbol represents & backgrounding)
12, change passwords
Log into mysql, the mysql-5.7.24 / command in the bin directory: ./mysql -uroot -p -P3306 -h127.0.0.1 Modify the mysql password, execute: alter user 'root'@'localhost' identified by '123456';
13, unauthorized remote access
a, After logging in, execute the command :( so that remote clients can access) grant all privileges on *.* to root@'%' identified by '123456'; Where * * * represents all first database name, * second means all database tables; @ root '%' in the root represents the user name, address means ip%,% can also specify a particular ip address, such as root @ localhost, root @ 192.168.10.888 b, if not remote access, execute the following command to refresh the following rights: flush privileges; c, if after the implementation of the above authorized remote access remote connection is still not on the mysql, may be blocked by the firewall on Linux d, open firewall port command: firewall-cmd --zone=public --add-port=3306/tcp --permanent Command Meaning: --zone # Scope: View current locale: Firewall-cmd --get- default - Zone --add-Port = 3306 / tcp # Add port, the format is: port / protocol - Permanent # permanent, no this parameter is invalid after the restart Reload the firewall configuration: Firewall -cmd - reload Restart the firewall: systemctl restart firewalld Cancel ports open: firewall-cmd --zone=public --remove-port=3306/tcp --permanent Query port number 8080 is turned on: firewall-cmd --query-port=8080/tcp Discover what ports are open: firewall-cmd --list-port
14, shut down MySQL service
Enter mysql-5.7.24 / command in the bin directory:
./mysqladmin -uroot -p -P3306 -h127.0.0.1 shutdown
15, other commands
mysql 5.5, mysql 5.6, mysql 5.7 : default maximum number of connections are 151, upper limit: 100,000 th; mysql5.0 version: The default maximum number of connections is 100, the upper limit is 16384; Check the maximum number of connections mysql: show variables like '%max_connections%'; View the current number of connections: show global status like 'max_used_connections';
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