linux下安裝mysql8

參考鏈接：https://blog.csdn.net/atongmu2017/article/details/90610444

檢查並卸載

rpm -qa|grep -i mysql

打印結果

mysql-community-libs-8.0.18-1.el7.x86_64
mysql80-community-release-el7-3.noarch
mysql-community-common-8.0.18-1.el7.x86_64
mysql-community-libs-compat-8.0.18-1.el7.x86_64
mysql-community-client-8.0.18-1.el7.x86_64

卸載

yum remove mysql-community-libs-8.0.18-1.el7.x86_64
yum remove mysql80-community-release-el7-3.noarch
yum remove mysql-community-common-8.0.18-1.el7.x86_64
yum remove mysql-community-libs-compat-8.0.18-1.el7.x86_64
yum remove mysql-community-client-8.0.18-1.el7.x86_64

下載和安裝

• 下載地址 https://dev.mysql.com/downloads/repo/yum/
• 下載 mysql-8.0.18-linux-glibc2.12-x86_64.tar.xz

解壓

tar xvJf  mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz
# 重新命名
mv mysql-8.0.18-linux-glibc2.12-x86_64 mysql
# 移動
mv mysql /usr/local

進入到/usr/local目錄下，創建用戶和用戶組並授權

cd /usr/local
groupadd mysql
useradd -r -g mysql mysql
#注意：進入mysql文件下授權所有的文件
cd mysql
chown -R mysql:mysql ./
#修改mysql用戶密碼
passwd mysql

創建data文件夾

pwd
# /usr/local/myql
mkdir data

初始化數據庫，並會自動生成隨機密碼，記下等下登陸要用

bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data
# for root@localhost:  oVeyi8*SM*.W

修改/usr/local/mysql當前目錄的用戶

chown -R root:root ./
chown -R mysql:mysql data
# 查看結果
ll

打印出的結果爲：

drwxr-xr-x.  2 root  root    4096 9月  20 20:57 bin
drwxr-xr-x.  6 mysql mysql   4096 11月  3 21:30 data
drwxr-xr-x.  2 root  root      86 9月  20 20:57 docs
drwxr-xr-x.  3 root  root    4096 9月  20 20:57 include
drwxr-xr-x.  7 root  root    4096 9月  20 20:57 lib
-rwxr-xr-x.  1 root  root  408918 9月  20 16:30 LICENSE
-rwxr-xr-x.  1 root  root  102977 9月  20 16:30 LICENSE.router
drwxr-xr-x.  4 root  root      30 9月  20 20:57 man
-rwxr-xr-x.  1 root  root     687 9月  20 16:30 README
-rwxr-xr-x.  1 root  root     700 9月  20 16:30 README.router
drwxr-xr-x.  2 root  root       6 9月  20 20:57 run
drwxr-xr-x. 28 root  root    4096 9月  20 20:57 share
drwxr-xr-x.  2 root  root     108 11月  3 20:37 support-files
drwxr-xr-x.  3 root  root      17 9月  20 20:57 var

編輯 etc/my.cnf 文件

# 在目錄support-files下
pwd
cd support-files
#新建文件
touch my-default.cnf
#賦權
chmod 777 ./my-default.cnf 
#複製
cp my-default.cnf /etc/my.cnf 
#編輯/etc/my.cnf文件
vim /etc/my.cnf

/etc/my.cnf 文件內容如下【端口號可自己設置本例爲5186】

[mysqld]
 
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
 
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
 
# These are commonly set, remove the # and set as required.
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
socket = /tmp/mysql.sock
log-error = /usr/local/mysql/data/error.log
pid-file = /usr/local/mysql/data/mysql.pid
tmpdir = /tmp
port = 5186
#lower_case_table_names = 1
# server_id = .....
# socket = .....
#lower_case_table_names = 1
max_allowed_packet=32M
default-authentication-plugin = mysql_native_password
#lower_case_file_system = on
#lower_case_table_names = 1
log_bin_trust_function_creators = ON
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M 
 
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

開機自啓，進入/usr/local/mysql/support-files進行設置

cd /usr/local/mysql/support-files
 cp mysql.server /etc/init.d/mysql
 chmod +x /etc/init.d/mysql

註冊服務

chkconfig --add mysql

etc/ld.so.conf要配置路徑

vim /etc/ld.so.conf

添加如下內容

/usr/local/mysql/lib

配置環境變量

vim /etc/profile

增加如下內容

#MYSQL ENVIRONMENT
export PATH=$PATH:/usr/local/mysql/bin:/usr/local/mysql/lib

增加後使文件生效

source /etc/profile

啓動mysql

#啓動命令
systemctl start mysql
#查看狀態
systemctl status mysql
# 停服務
systemctl stop mysql

Mysql 查看端口號的幾種方式

1.ps

ps -ef|grep mysql|grep port
#或者

ps aux|grep mysql|grep port

2.netstat用於顯示各種網絡相關信息

netstat -antp|grep mysql|grep LISTEN

3.察看/etc/my.cnf 文件

grep port /etc/my.cnf

登錄sql

mysql -u root -p
#密碼爲之前生成的隨機密碼

進入mysql之後修改登錄密碼

alter user 'root'@'localhost' identified by '123456';

遠程連接

create user 'cici'@'%' identified by '123123';
grant all on *.* to 'cici'@'%';
flush privileges;

遠程連接賬戶 cici 密碼 123123

注意如果連不上，需要檢查一下防火牆