1. Installation
Method 1: Install MySQL via Docker
1. search
docker search mysql
2. pull
docker pull mysql3. images
docker images
4. Install mapped port rename
docker run -p 3306:3306 --name mysql -e MYSQL_ROOT_PASSWORD=root -d mysql --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci5. View the running container
docker ps
At this point, you're done! Use database software to connect
Chinese garbled characters appear when Docker installs mysql, please click here!
Method 2: Install MySQL through mirroring
The first step: download
Method 1: Click here to download , as shown below:
Method 2: Execute the following statement in the directory where you want to place the installation package
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.26-linux-glibc2.12-x86_64.tar.gzStep 2: Unzip and move
Note: Moving is not necessary, but there are specified file directories in the following configuration, and the installation of mysql on the Mac will also be placed in /usr/local by default, so it is best to follow the steps below.
Unzip:
tar -zxvf mysql-5.7.29-linux-glibc2.12-x86_64.tar.gzmobile:
mv mysql-5.7.29-linux-glibc2.12-x86_64 /usr/mysqlRename (rename and soft link, choose one of the two)
① Rename:
mv mysql-5.7.29-linux-glibc2.12-x86_64/ mysql-5.7.29② Soft connection command:
ln -s mysql-5.7.29-linux-glibc2.12-x86_64/ mysql-5.7.29Step 3: Create users and assign permissions to the data directory
Create the mysql group and user:
groupadd mysql
useradd -r -g mysql mysqlCreate the mysq data directory (back to the root directory):
cd /
mkdir -p data
cd data/
mkdir -p mysql
Grant permissions:
chown mysql:mysql -R /data/mysqlStep 4: Configure parameters
carried out:
vim /etc/my.cnf
Then press i to enter the editing mode and copy the following content into it:
[mysqld]
bind-address=0.0.0.0
port=3306
user=mysql
basedir=/usr/mysql/mysql-5.7.29/
datadir=/data/mysql
socket=/tmp/mysql.sock
log-error=/data/mysql/mysql.err
pid-file=/data/mysql/mysql.pid
# character config
character_set_server=utf8mb4
symbolic-links=0
After editing, press esc and hold down shift+: input wq to save and exit.
Step 5: Initialize mysql
cd /usr/mysql/mysql-5.7.29/bin/./mysqld --defaults-file=/etc/my.cnf --basedir=/usr/mysql/mysql-5.7.29/ --datadir=/data/mysql/ --user=mysql --initializeThe following problems may occur (please ignore if not):
Solution: This is but less numactl. At this time, if it is Centos, execute yum -y install numactl to solve this problem. Run sudo apt-get install numactl in ubuntu. as follows:
Then execute the above statement and find that the execution is successful:
Check the initial password and copy it out:
cat /data/mysql/mysql.err
Step 6: Start mysql and change the root password
First put mysql.server in /etc/init.d/mysql:
cp /usr/mysql/mysql-5.7.29/support-files/mysql.server /etc/init.d/mysqlstart up:
service mysqld startThe following problems may occur (please ignore if not):
Reason: Because there is no path and no permissions, this path is created and authorized to the mysql user, as follows:
solve!
Check whether to start:
ps -ef|grep mysql
change the password:
cd /usr/mysql/mysql-5.7.29/bin
./mysql -u root -pPrompt for the password, paste the password you just copied
Then perform the modification and refresh
SET PASSWORD = PASSWORD('**********');
ALTER USER 'root'@'localhost' PASSWORD EXPIRE NEVER;
FLUSH PRIVILEGES;
This is the end, if you want to close mysql, execute service mysqld stop
If you use a remote connection at this time, you will find that you cannot connect...
The following three commands are mainly executed here (log into the database first):
use mysql # 访问mysql库
update user set host = '%' where user = 'root'; # 使root能再任何host访问
FLUSH PRIVILEGES; # 刷新
solve:
Precautions:
If the above steps have permission problems, you can execute the following commands and turn on the autostart:
cp ./support-files/mysql.server /etc/init.d/mysqld
chown 777 /etc/my.cnf
chmod +x /etc/init.d/mysqldAlso, if your system has Mariadb before installation, uninstall it.
The first command is used to view, if there is, use the following command to uninstall
rpm -qa|grep mariadb
rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64In addition, if something that appears during the 5.7 installation is not resolved, it may be that your system was not clean before installation and you need to uninstall the residual mysql files.
Set MySQL to start at boot
1. Copy the service file to init.d and rename it to mysqld
cp /usr/mysql/mysql-5.7.29/support-files/mysql.server /etc/init.d/mysqld2. Grant executable permissions
chmod +x /etc/init.d/mysqld3. Add service
chkconfig --add mysqld4. Display service list
chkconfig --list
If you see the mysql service, and 3, 4, and 5 are all on, then it succeeds, if it is off, type
chkconfig --level 345 mysqld on5. Restart to take effect
rebootTwo, uninstall
1. Check the current installation of mysql
rpm -qa | grep -i mysql2. Stop the mysql service and delete the previously installed mysql
Delete command:rpm -ev 包名
If it prompts a dependency package error, use the following command to try:rpm -ev 包名 –-nodeps
If you get an error:, error: %preun(xxxxxx) scriptlet failed, exit status 1try the following command:rpm -e --noscripts 包名
3. Find the directory of the previous old version of mysql, and delete the files and libraries of the old version of mysql
find / -name mysqlUse the following command to delete the specified directory:rm -rf 路径
Note: /etc/my.cnf will not be deleted after uninstallation, it needs to be deleted manually:
rm -rf /etc/my.cnf4. Find again whether the machine has mysql installed
rpm -qa | grep -i mysqlIf there is no result, mysql has been completely uninstalled.
If there is a problem outside the article, you can privately write to the author.