下文内容主要给大家带来linux系统应该如何安装mysql5.7.21版本数据库，所讲到的知识，与书籍略有不同，都是专业技术人员在与用户接触过程中，总结出来的，具有一定的经验分享价值，希望给广大读者带来帮助。

1、下载数据库版本

mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz

2、解压

tar -zxvf mysql-5.7.21-linux-glibc2.12-x86_64.tar.gz
mv mysql-5.7.21-linux-glibc2.12-x86_64 mysql

3、 初始化数据库

5.7与以前的版本初始化有所不同
mkdir /ghca/mysql/data
mkdir /ghca/mysql/log
安装numactl    yum  install    numactl

./mysqld --initialize --user=mysql --basedir=/ghca/mysql/ --datadir=/ghca/mysql/data

2018-03-29T06:44:18.994928Z 0 [Warning] [MY-011070] Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it is deprecated and will be removed in a future release.
2018-03-29T06:44:18.995070Z 0 [System] [MY-010116] /ghca/mysql/bin/mysqld (mysqld 8.0.4-rc) starting as process 23100 ...
2018-03-29T06:44:23.952948Z 0 [Warning] [MY-010068] CA certificate ca.pem is self signed.
2018-03-29T06:44:24.389231Z 5 [Note] [MY-010454] A temporary password is generated for root@localhost: Y%7923Moc7dd  这是root密码

复制mysql.server到/etc/init.d/
cp support-files/mysql.server  /etc/init.d/mysql

修改配置文件
cat my.cnf
[client]
port = 3306
socket =/ghca/mysql/mysql.sock

[mysqld]
port = 3306
user = mysql
character-set-server = utf8
#default_storage_engine = innodb
log_timestamps = SYSTEM
socket =/ghca/mysql/mysql.sock
basedir =/ghca/mysql/
datadir =/ghca/mysql/data
pid-file =/ghca/mysql/data/mysql.pid
max_connections = 1000
max_connect_errors = 1000
table_open_cache = 1024
max_allowed_packet = 128M
open_files_limit = 65535
#####====================================[innodb]==============================
innodb_buffer_pool_size = 1024M
innodb_file_per_table = 1
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_purge_threads = 2
innodb_flush_log_at_trx_commit = 1
innodb_log_file_size = 512M
innodb_log_files_in_group = 2
innodb_log_buffer_size = 16M
innodb_max_dirty_pages_pct = 80
innodb_lock_wait_timeout = 30
innodb_data_file_path=ibdata1:1024M:autoextend

#####====================================[log]==============================
log_error =/ghca/mysql/log/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file =/ghca/mysql/log/mysql-slow.log

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

4、 添加开机自动启动

chkconfig --add mysql
chkconfig mysql on
service mysql start

5、不知道root密码操作步骤

1、停止mysql
2、./mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
3、登录mysql
mysql
mysql> update mysql.user set authentication_string=password('123456') where user='root' and Host = 'localhost';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;

6、数据库安装完成之后，无法启动

service mysql start
Starting MySQL. ERROR! The server quit without updating PID file (/ghca/mysql/data/mysql.pid).
修改my.cnf文件权限
chmod 775 /ghca/mysql/my.cnf

service mysql start

my_print_defaults: [Warning] World-writable config file '/ghca/mysql/my.cnf' is ignored.
Starting MySQL.my_print_defaults: [Warning] World-writable config file '/ghca/mysql/my.cnf' is ignored.
my_print_defaults: [Warning] World-writable config file '/ghca/mysql/my.cnf' is ignored.
SUCCESS!

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