Linux下MySQL安装（tar包）
1.下载并解压
tar -zxvf ./mysql-5.7.27-linux-glibc2.12-x86_64.tar.gz
mv /opt/mysql-5.7.27-linux-glibc2.12-x86_64 /opt/mysql-5.7.27
2.创建mysql用户组和用户
groupadd mysql
useradd -r -g mysql mysql
3.改变mysql安装目录的所有者以及访问权限
chown -R mysql:mysql /opt/mysql-5.7.27
chmod -R 755 /opt/mysql-5.7.27
4.修改mysql配置文件
vim /opt/mysql-5.7.27/support-files/mysql.server
if test -z "$basedir"
then
basedir=/opt/mysql-5.7.27
bindir=/opt/mysql-5.7.27/bin
if test -z "$datadir"
then
datadir=/opt/mysql-5.7.27/data
fi
sbindir=/opt/mysql-5.7.27/bin
libexecdir=/opt/mysql-5.7.27/bin
else
bindir="$basedir/bin"
if test -z "$datadir"
then
datadir="$basedir/data"
fi
sbindir="$basedir/sbin"
libexecdir="$basedir/libexec"
fi
复制配置文件到/etc/init.d目录下，为了能使用systemctl命令启动：
cp /opt/mysql-5.7.27/support-files/mysql.server /etc/init.d/mysqld
chmod 755 /etc/init.d/mysqld
5.创建my.cnf文件
vim /etc/my.cnf
[client]
no-beep
socket =/opt/mysql-5.7.27/mysql.sock
#pipe
#socket=0.0
port=3306
[mysql]
default-character-set=utf8
[mysqld]
basedir=/opt/mysql-5.7.27
datadir=/opt/mysql-5.7.27/data
port=3306
pid-file=/opt/mysql-5.7.27/mysqld.pid
#skip-grant-tables
skip-name-resolve
socket = /opt/mysql-5.7.27/mysql.sock
character-set-server=utf8
default-storage-engine=INNODB
explicit_defaults_for_timestamp = true
#Server Id.
server-id=1
max_connections=2000
query_cache_size=0
table_open_cache=2000
tmp_table_size=246M
thread_cache_size=300
#限定用于每个数据库线程的栈大小。默认设置足以满足大多数应用
thread_stack = 192k
key_buffer_size=512M
read_buffer_size=4M
read_rnd_buffer_size=32M
innodb_data_home_dir = /opt/mysql-5.7.27/data
innodb_flush_log_at_trx_commit=0
innodb_log_buffer_size=16M
innodb_buffer_pool_size=256M
innodb_log_file_size=128M
innodb_thread_concurrency=128
innodb_autoextend_increment=1000
innodb_buffer_pool_instances=8
innodb_concurrency_tickets=5000
innodb_old_blocks_time=1000
innodb_open_files=300
innodb_stats_on_metadata=0
innodb_file_per_table=1
innodb_checksum_algorithm=0
back_log=80
flush_time=0
join_buffer_size=128M
max_allowed_packet=1024M
max_connect_errors=2000
open_files_limit=4161
query_cache_type=0
sort_buffer_size=32M
table_definition_cache=1400
binlog_row_event_max_size=8K
sync_master_info=10000
sync_relay_log=10000
sync_relay_log_info=10000
#批量插入数据缓存大小，可以有效提高插入效率，默认为8M
bulk_insert_buffer_size = 64M
interactive_timeout = 120
wait_timeout = 120
log-bin-trust-function-creators=1
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#include all files from the config directory
!includedir /etc/my.cnf.d
6.初始化mysql
/opt/mysql-5.7.27/bin/mysqld -user=mysql --initialize
执行完后会有一个初始密码，一定要记住！！！
7.启动mysql
/etc/init.d/myqld start
#或者
systemctl restart mysqld
8.登陆mysql
/opt/mysql-5.7.27/bin/mysql -u root -p
输入临时密码进入。
9.修改临时密码，授予root用户所有权限
set password=password('root');
grant all privileges on * . * to root@'%' identified by 'root';
flush privileges;
完成！！！