centos7安装mysql-8.0.15

1.获取mysql
   wget https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.15-linux-glibc2.12-x86_64.tar.xz
   (安装wget命令：yum install wget -y)
2.解压mysql
   xz -d mysql-8.0.15-linux-glibc2.12-x86_64.tar.xz
   tar -xvf mysql-8.0.15-linux-glibc2.12-x86_64.tar
3.移动文件到安装目录/usr/local/mysql
   mv mysql-8.0.15-linux-glibc2.12-x86_64 /usr/local/mysql
4.添加mysql用户
  adduser mysql
5.添加编辑/etc/my.cnf配置文件

[client]
port = 3306
socket = /usr/local/mysql/data/mysql.sock
[mysqld]
# Skip #
skip_name_resolve = 1
skip_external_locking = 1 
skip_symbolic_links = 1
# GENERAL #
user = mysql
default_storage_engine = InnoDB
character-set-server = utf8
socket = /usr/local/mysql/data/mysql.sock
pid_file = /usr/local/mysql/data/mysqld.pid
basedir = /usr/local/mysql
port = 3306
bind-address = 0.0.0.0
explicit_defaults_for_timestamp = off
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#read_only=on
# MyISAM #
key_buffer_size = 32M
#myisam_recover = FORCE,BACKUP

# undo log #
innodb_undo_directory = /usr/local/mysql/undo
innodb_undo_tablespaces = 8

# SAFETY #
max_allowed_packet = 100M
max_connect_errors = 1000000
sysdate_is_now = 1
#innodb = FORCE
#innodb_strict_mode = 1
secure-file-priv='/tmp'
default_authentication_plugin='mysql_native_password'
# Replice #
server-id = 1001
relay_log = mysqld-relay-bin
gtid_mode = on
enforce-gtid-consistency
log-slave-updates = on
master_info_repository =TABLE
relay_log_info_repository =TABLE


# DATA STORAGE #
datadir = /usr/local/mysql/data/
tmpdir = /tmp

# BINARY LOGGING #
log_bin = /usr/local/mysql/sql_log/mysql-bin
max_binlog_size = 1000M
binlog_format = row
binlog_expire_logs_seconds=86400
# sync_binlog = 1

# CACHES AND LIMITS #
tmp_table_size = 32M
max_heap_table_size = 32M
max_connections = 4000
thread_cache_size = 2048
open_files_limit = 65535
table_definition_cache = 4096
table_open_cache = 4096
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 2M
# thread_concurrency = 24
join_buffer_size = 1M
# table_cache = 32768
thread_stack = 512k
max_length_for_sort_data = 16k


# INNODB #
innodb_flush_method = O_DIRECT
innodb_log_buffer_size = 16M
innodb_flush_log_at_trx_commit = 2
innodb_file_per_table = 1
innodb_buffer_pool_size = 256M
#innodb_buffer_pool_instances = 8
innodb_stats_on_metadata = off
innodb_open_files = 8192
innodb_read_io_threads = 16
innodb_write_io_threads = 16
innodb_io_capacity = 20000
innodb_thread_concurrency = 0
innodb_lock_wait_timeout = 60
innodb_old_blocks_time=1000
innodb_use_native_aio = 1
innodb_purge_threads=1
innodb_change_buffering=all
innodb_log_file_size = 64M
innodb_log_files_in_group = 2
innodb_data_file_path = ibdata1:256M:autoextend

innodb_rollback_on_timeout=on
# LOGGING #
log_error = /usr/local/mysql/sql_log/mysql-error.log
# log_queries_not_using_indexes = 1
# slow_query_log = 1
slow_query_log_file = /usr/local/mysql/sql_log/slowlog.log

# TimeOut #
#interactive_timeout = 30
#wait_timeout = 30
#net_read_timeout = 60

[mysqldump]
quick
max_allowed_packet = 100M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 256M
sort_buffer_size = 256M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

6.生成data sql_log undo目录，并修改属主
   mkdir data sql_log undo
   chown mysql:mysql -R data/ sql_log/ undo/
7.将/user/local/mysql/bin路径添加到/etc/profile中
   export PATH=$PATH:/user/local/mysql/bin
   执行命令 source /etc/profile重启
8.初始化mysql
   mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data
9.拷贝support-files目录下的mysql.server到/etc/init.d/mysqld
   cd /usr/etc/mysql/support-files
   cp mysql.server /etc/init.d/mysqld
10.启动mysql服务
   /etc/init.d/mysqld start
   查看mysql进程：ps -ef | grep mysql

   设置开机启动：
   赋予可执行权限：chmod +x /etc/init.d/mysqld
   添加服务：chkconfig --add mysqld
   显示服务列表：chkconfig --list
   如果看到mysql的服务，并且3,4,5都是开的话则成功，如果是关，则键入：chkconfig --level 345 mysqld on

11.查询初试密码sql_log/mysql-error.log
   cd /usr/local/mysql/sql_log
   grep password mysql-error.log
12.使用上面的初试密码登录mysql
   mysql -uroot -p
13.修改密码，这里密码设置为123456
  alter user user() identified by '123456';
14.设置外网可以连接
  mysql -u root -p
  进入mysql数据库：use mysql;
  查看user表中的数据：select Host, User from user;
  修改user表中的Host:update user set Host='%' where User='root';
  最后刷新一下：flush privileges;