misswell系统 CentOS 7：
http://mirrors.aliyun.com/centos/7/isos/x86_64/
MySQL 安装
安装依赖包
yum install -y gcc gcc-c++ cmake ncurses ncurses-devel bison
yum -y install openssl-devel安装 MySQL ，编译安装需要 boost 库，在官网下载含 boost 的源码包
https://dev.mysql.com/downloads/mysql/5.7.html
curl -O https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-boost-5.7.30.tar.gz添加用户
useradd -s /sbin/nologin mysql建立所需目录并更改所有者为 mysql
mkdir -p /data/mysql/data
chown -R mysql:mysql /data/mysql解压，编译安装
tar -zxvf mysql-boost-5.7.30.tar.gz
cd mysql-5.7.30/
cmake -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_BOOST=boost
make && make install安装后得 /usr/local/mysql 目录
编辑配置文件 vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
user = mysql
basedir = /usr/local/mysql
datadir = /data/mysql/data
pid-file = /data/mysql/mysql.pid
log_error = /data/mysql/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /data/mysql/mysql-slow.log
skip-external-locking
key_buffer_size = 32M
max_allowed_packet = 1024M
table_open_cache = 128
sort_buffer_size = 768K
net_buffer_length = 8K
read_buffer_size = 768K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
thread_cache_size = 16
query_cache_size = 16M
tmp_table_size = 32M
performance_schema_max_table_instances = 1000
explicit_defaults_for_timestamp = true
#skip-networking
max_connections = 500
max_connect_errors = 100
open_files_limit = 65535
log_bin=mysql-bin
binlog_format=mixed
server_id = 232
expire_logs_days = 10
early-plugin-load = ""
default_storage_engine = InnoDB
innodb_file_per_table = 1
innodb_buffer_pool_size = 128M
innodb_log_file_size = 32M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 32M
sort_buffer_size = 768K
read_buffer = 2M
write_buffer = 2M安装目录和数据目录修改用户组
注：/data/mysql/data 目录要为空
chown -R mysql:mysql /usr/local/mysql
chown -R mysql:mysql /data/mysql初始化 MySQL
/data/mysql/data 这个目录须为空，指定的 basedir 和 datadir 目录须和/etc/my.cnf 配置的目录一致
cd /usr/local/mysql/bin
./mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql/data设置服务文件
cd /usr/local/mysql/support-files/
cp mysql.server /etc/init.d/mysqld启动
service mysqld start
连接测试（密码空）
cd /usr/local/mysql/bin
./mysql -hlocalhost -uroot -p修改环境变量
vim /etc/profile
最后增加一行
PATH=/usr/local/mysql/bin:$PATH
保存退出，刷新权限，设置服务
source /etc/profile
systemctl enable mysqldcentos7 源码编译安装 mysql5.7
https://blog.csdn.net/zhang_referee/article/details/88212695
https://www.cnblogs.com/NanZhiHan/p/11017158.html
无密码登录修改密码
update mysql.user set authentication_string=password("root") where user="root";
或者
ALTER USER root IDENTIFIED BY '123456';可能会出现报错
ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'%'mysql> use mysql
mysql> select user,host from user;
注意 root 的 host 是 localhost，所以语句修改为
ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';退出 MySQL 刷新权限
mysql> flush privileges;MySQL数据库如何修改密码
https://www.csdn.net/gather_27/MtTaIgysMzQxMC1ibG9n.html
开启外部访问（改表法）
mysql> use mysql
mysql> update user set host = '%' where user = 'root';
mysql> flush privileges;或者（授权法）
mysql> grant all privileges on *.* to root@'%' identified by "123456";
mysql> flush privileges;https://www.cnblogs.com/weifeng1463/p/7941625.html
mysql中grant all privileges on赋给用户远程权限
https://blog.csdn.net/qq_31725371/article/details/83019856
关闭防火墙或设置 3306 端口外部访问
firewall-cmd --state
systemctl stop firewalld#启动防火墙
systemctl start firewalld
#添加端口访问
firewall-cmd --permanent --add-port=3306/tcp
#重新加载防火墙配置
firewall-cmd --reload