CentOS installs JDK1.8 and mysql5 and 8 (the same command 58 in the second installation mode is common, opening access rights and changing passwords)

jdk And mysql Both contain tar Package and yum Two installation methods

The first one is jdk
Download good tar package
tar zxvf jdk-8u181-linux-x64.tar.gz /usr/local/java

Configure environment variables
vim /etc/profile

Add at the bottom
export JAVA_HOME=/usr/local/java/jdk1.8.0_181
export PATH=$JAV{A}_{H}OME/bin:$PATH
wq preservation

Input java -version、javac、 java Come and check 8481bc1aa61953d.png)
Whether the certificate is installed

The second kind jdk use yum install
yum -y remove java*
After uninstalling, restart
yum -y install java-1.8.0-openjdk-devel.x86_64

mysql Installation mode

The first one is mysql use yum install
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql-community-server
Download dependent installation services ,8 As the corresponding 8 Of rpm that will do

start-up :systemctl start mysqld.service

View service :systemctl status mysqld.service
Check the password :grep “password” /var/log/mysqld.log

The last is mysql The opening of password and access rights is put in tar Package installed together

The second kind mysqltar Package installation method
tar -zxvf /root/mysql-5.7.30-linux-glibc2.12-x86_64.tar.gz -C
/usr/local/
mv mysql-5.7.30-linux-glibc2.12-x86_64 mysql
groupadd mysql
useradd -g mysql mysql
mkdir /usr/local/mysql/data
chown -R mysql:mysql ./

vim /etc/my.cnf
[mysql]

Set up mysql Client default character set

default-character-set=utf8
socket=/var/lib/mysql/mysql.sock
[mysqld]
skip-name-resolve
# Set up 3306 End ⼝
port = 3306
socket=/var/lib/mysql/mysql.sock

Set up mysql Installation ⽬ record

basedir=/usr/local/mysql

Set up mysql The storage of data in the database ⽬ record

datadir=/usr/local/mysql/data

Allow the most ⼤ The number of connections

max_connections=200

The server makes ⽤ The default character set is 8⽐ Special coded latin1 Character set

character-set-server=utf8

Creating a new table will make ⽤ The default storage engine for

default-storage-engine=INNODB
lower_case_table_names=1
max_allowed_packet=16M

mkdir /var/lib/mysql
chmod 777 /var/lib/mysql
cd /usr/local/mysql
./bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql –
datadir=/usr/local/mysql/data
cp ./support-files/mysql.server /etc/init.d/mysqld

vim /etc/init.d/mysqld
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data

chmod +x /etc/init.d/mysqld
chkconfig --add mysqld
chkconfig --list mysqld
service mysqld start

vim ~/.bash_profile
export PATH=$PATH:/usr/local/mysql/bin

source ~/.bash_profile

mysql -u root -p
alter user user() identified by “root”;
flush privileges;
use mysql;
update user set user.Host=’%’ where user.User=‘root’;
flush privileges;

All installed , The second kind mysql The installation method is applicable to 5 And 8 Fine , Just copy it , Copy in large sections
Every time you install this