MySQL8.0安装
0.环境：
os : CentOS release 6.10 (Final)
Msyql: mysql8.0.14
1.下载官方打包好的二进制安装包：
#wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.14-linux-glibc2.12-x86_64.tar.xz
8.0采用了新的.xz压缩方式，文件很小，只有350M左右
2.解压：
tar -xJvf mysql-8.0.14-linux-glibc2.12-x86_64.tar.xz
3.放到/usr/local下
[root@iceman local]# ln -s mysql-8.0.14-linux-glibc2.12-x86_64 mysql
4.配置参数文件 /etc/my.cnf
[mysqld]
server-id = 1
port = 3306
datadir = /data/mysql
socket = /tmp/mysql.sock
pid-file = /tmp/mysqld.pid
log-error = error.log
slow-query-log = 1
slow-query-log-file = slow.log
long_query_time = 0.2
log-bin = bin.log
binlog_format =ROW
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect ='SET NAMES utf8mb4'
innodb_buffer_pool_size = 200M
join_buffer_size = 10M
sort_buffer_size = 2M
read_rnd_buffer_size = 2M
log_timestamps = SYSTEM
5.创建用户和目录
[root@iceman ~]# groupadd mysql
[root@iceman ~]# useradd -r -g mysql -s /bin/false mysql ### /bin/false的意思是，禁止一起登录行为
[root@iceman ~]# mkdir -p /data/mysql
[root@iceman ~]# chown -R mysql:mysql /data/mysql/
[root@iceman ~]# chmod -R 775 /data/mysql/
6.初始化数据库：可以用--initialize-insecure不生成密码
[root@iceman bin]# pwd
/usr/local/mysql/bin
[root@iceman bin]# ./mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql
初始化的时候遇到如下两个问题，用Yum 安装上即可。
./mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
yum -y install libaio
./mysqld: error while loading shared libraries: libnuma.so.1: cannot open shared object file: No such file or directory
yum -y install numactl
7.设置启动文件：
#cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql
--启动数据库：
# /etc/init.d/mysql start
Starting MySQL.Logging to '/data/mysql/error.log'.
SUCCESS!
8.修改环境变量
# vim /etc/profile.d/mysql.sh
export PATH=$PATH:/usr/local/mysql/bin
# source /etc/profile.d/mysql.sh
9 .修改密码
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql>
mysql>
mysql> alter user root@localhost identified by 'Hellxxxeiyun!@#$';
Query OK, 0 rows affected (0.01 sec)
