Linux Installation mysql8

uninstall MariaDB

1. Check

rpm -qa|grep mariadb

2. uninstall

rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64

3. Check if the unloading is clean

rpm -qa|grep mariadb

install MySQL

1. Two ways to install

• Download and install manually on the official website

 Official website address ：https://dev.mysql.com/downloads/mysql/
 After downloading, drag to Linux Of /usr/local

• network install

cd /usr/local
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz

2. decompression

.tar.gz suffix ：tar -zxvf  file name 
.tar.xz suffix ：tar -Jxvf  file name 

3. rename

mv  Original folder name  mysql8

4. Configure environment variables

• vim /etc/profile

JAVA_HOME=/usr/java/jdk1.8.0_152
JRE_HOME=/usr/java/jdk1.8.0_151/jre
HADOOP_HOME=/usr/local/hadoop-2.7.1
ZOOKEEPER_HOME=/usr/local/zookeeper-3.3.6
FLUME_HOME=/usr/local/flume-1.9.0
NGINX_HOME=/usr/local/nginx
TOMCAT_HOME=/usr/local/tomcat-8.5.81
MYSQL8_HOME=/usr/local/mysql8

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$ZOOKEEPER_HOME/bin:$FLUME_HOME/bin:$NGINX_HOME/sbin:$TOMCAT_HOME/bin:$MYSQL8_HOME/bin
export PATH CLASSPATH JAVA_HOME JRE_HOME HADOOP_HOME ZOOKEEPER_HOME FLUME_HOME NGINX_HOME TOMCAT_HOME MYSQL8_HOME

• source /etc/profile

5. Users and user groups

• Create a user group ：mysql

groupadd mysql

• Create a system user ：mysql, Specify the user group as mysql

useradd -r -g mysql mysql
	-r： Create system user 
	-g： Specify user groups 

6. Data directory

• Create directory

cd /usr/local/mysql8
mkdir datas

• Change owner and array

chown -R mysql:mysql /usr/local/mysql8/datas

• Change mode

chmod -R 750 /usr/local/mysql8/datas

initialization MySQL

1. Configuration parameters

• cd /usr/local/mysql8
• vim my.cnf

[mysql]
#  Default character set 
default-character-set=utf8mb4
[client]
port       = 3306
socket     = /tmp/mysql.sock

[mysqld]
port       = 3306
server-id  = 3306
user       = mysql
socket     = /tmp/mysql.sock
#  The installation directory 
basedir    = /usr/local/mysql8
#  Data storage directory 
datadir    = /usr/local/mysql8/datas/mysql
log-bin    = /usr/local/mysql8/datas/mysql/mysql-bin
innodb_data_home_dir      =/usr/local/mysql8/datas/mysql
innodb_log_group_home_dir =/usr/local/mysql8/datas/mysql
# The storage directory of logs and process data 
log-error =/usr/local/mysql8/datas/mysql/mysql.log
pid-file  =/usr/local/mysql8/datas/mysql/mysql.pid
#  The character set used by the server defaults to 8 Bit code 
character-set-server=utf8mb4
lower_case_table_names=1
autocommit =1
 
 ################## The above to be modified ########################
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache = 1024
sort_buffer_size = 4M
net_buffer_length = 8K
read_buffer_size = 4M
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 64M
thread_cache_size = 128
  
#query_cache_size = 128M
tmp_table_size = 128M
explicit_defaults_for_timestamp = true
max_connections = 500
max_connect_errors = 100
open_files_limit = 65535
   
binlog_format=mixed
    
binlog_expire_logs_seconds =864000
    
#  The default storage engine that will be used when creating a new table 
default_storage_engine = InnoDB
innodb_data_file_path = ibdata1:10M:autoextend
innodb_buffer_pool_size = 1024M
innodb_log_file_size = 256M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
transaction-isolation=READ-COMMITTED
      
[mysqldump]
quick
max_allowed_packet = 16M
       
[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 4M
read_buffer = 2M
write_buffer = 2M
        
[mysqlhotcopy]
interactive-timeout

2. initialization

• mysqld --defaults-file=/usr/local/mysql8/my.cnf --basedir=/usr/local/mysql8/ --datadir=/usr/local/mysql8/datas/mysql --user=mysql --initialize-insecure

defaults-file： Specify profile （ Put it on –initialize  front ）
user：  Designated user 
basedir： Specify the installation directory 
datadir： Specify the initialization data directory 
intialize-insecure： Initialization without password 

start-up MySQL

1. see MySQL Of bin Under the path , Does it include mysqld_safe

2. Start the service

• Full command

/usr/local/mysql8/bin/mysqld_safe --defaults-file=/usr/local/mysql8/my.cnf &

• Command after adding environment variables

mysqld_safe --defaults-file=/usr/local/mysql8/my.cnf &

3. See if it starts

• ps -ef|grep mysql
  

Sign in

1. No password login mode

• /usr/local/mysql8/bin/mysql -u root --skip-password
  

2. There is a password login method （ The initial random password is /data/mysql8_data/mysql/mysql.log Next ）

• mysql -u root -p
• password: Random cipher

Change Password

1. Change Password

• ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password
  BY ‘a’;

2. Refresh the permissions

• FLUSH PRIVILEGES;

Set allow remote login

1. Set up

• use mysql
• update user set user.Host='%'where user.User=‘root’;
• flush privileges;
• quit

2.Navicat test