一、准备
mysql下载
mysql官网-->download-->社区版，选择对应操作系统版本的mysql安装文件，如下，
mysql1.png
Libmecab2 下载
到kpgs.org 选择对应的 Libmecab2
mysql2.png
二、安装
上面两个文件下载完成后，手动扔到对应的服务器的目录下，如/home/mysql/
进入目录，并解压
tar -xf mysql-server_5.7.22-1ubuntu16.04_amd64.deb-bundle.tar
得到如下安装包：
libmecab2_0.996-5_amd64.deb
-rwxr--r-- 1 7155 31415 1301712 Jul 1 15:24 libmysqlclient21_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 1622012 Jul 1 15:24 libmysqlclient-dev_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 65012 Jul 1 15:24 mysql-client_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 68672 Jul 1 15:24 mysql-common_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 2799440 Jul 1 15:24 mysql-community-client_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 1689600 Jul 1 15:24 mysql-community-client-core_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 1104956 Jul 1 15:24 mysql-community-client-plugins_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 76312 Jul 1 15:24 mysql-community-server_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 20275952 Jul 1 15:24 mysql-community-server-core_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 35801880 Jul 1 15:24 mysql-community-server-debug_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 226301924 Jul 1 15:24 mysql-community-test_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 9374376 Jul 1 15:24 mysql-community-test-debug_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 65004 Jul 1 15:24 mysql-server_8.0.26-1ubuntu18.04_amd64.deb
-rwxr--r-- 1 7155 31415 65012 Jul 1 15:24 mysql-testsuite_8.0.26-1ubuntu18.04_amd64.deb
按顺序执行以下指令
sudo dpkg -i mysql-common_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg-preconfigure mysql-community-server_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-client-plugins_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqlclient21_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqlclient-dev_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-client-core_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-client_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-client_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i libmecab2_0.996-5_amd64.deb
sudo dpkg -i mysql-community-server-core_8.0.26-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-server_8.0.26-1ubuntu18.04_amd64.deb
注意按顺序哦，要不然安装失败，也可以把指令拷贝到创建的install.sh可执行文件中，执行指令进行安装
./install.sh
安装过程中，需要收入密码，密码要记下来
三、验证并登陆查看
验证
安装完成后，可以通过下面的命令来查看时候安装成功：
systemctl status mysql
mysql10.png
看到上面的信息就说明MySQL已经安装好并运行起来了。
登陆MySQL
以root用户登陆
# -u 指定用户名 -p输入安装时，输入的密码
sudo mysql -u root -p
#或者:
sudo mysql #可以不需要指定用户名密码
mysql11.png
已经成功连接到数据库服务器了。那接下来我们看看这里都有哪些databases.
mysql>show databases;
mysql12.png
其它信息
MySQL安装好后有默认的这几个数据库。其中mysql里有user表，这个表里放了user、host相关的一些信息。通过下面的命令看到这个表。
mysql> show tables from mysql;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| component |
| db |
| default_roles |
| engine_cost |
| func |
| general_log |
| global_grants |
| gtid_executed |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| innodb_index_stats |
| innodb_table_stats |
| password_history |
| plugin |
| procs_priv |
| proxies_priv |
| role_edges |
| server_cost |
| servers |
| slave_master_info |
| slave_relay_log_info |
| slave_worker_info |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
33 rows in set (0.00 sec)
设置允许远程登录和开启防火墙
ysql默认不允许远程登录，所以需要开启远程访问权限
可以先查看user表
mysql> select User, Host from mysql.user;
+------------------+-----------+
| User | Host |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
默认都是localhost， 把root调整为远程登陆用户
use mysql;
update user set host = '%' where user = 'root';
此时root的host是所有都可以了
mysql> select User, Host from mysql.user;
+------------------+-----------+
| User | Host |
+------------------+-----------+
| root | % |
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
然后刷新修改
mysql> FLUSH PRIVILEGES;
开启防火墙
[root@localhost ~]# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success
[root@localhost ~]# firewall-cmd --reload
success
优化配置
sql> set global max_connections=3000 ##最大连接数
sql> set global thread_cache_size=60; ##最大并发数
卸载
卸载mysql（能卸载5.7和8.0）
sudo apt-get remove mysql-*
然后清理残留的数据
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P
开启关闭
开启 service mysql start
关闭 service mysql stop