在centos7.2 X64位上安装mysql 笔记
1.创建两个文件 cd / mkdir tools mkdir application 2.进入tools目录，下载mysql安装包 cd tools wget http://mirrors.sohu.com/mysql/MySQL-5.7/mysql-5.7.16-linux-glibc2.5-x86_64.tar.gz 3.进入安装目录，解压并且改名 cd application tar -xzvf /tools/mysql-5.7.16-linux-glibc2.5-x86_64.tar.gz ls mv mysql-5.7.16-linux-glibc2.5-x86_64 mysql 4.创建mysql用户组，使得mysql用户禁止登录，只能数据库连接 groupadd mysql useradd -M -s /sbin/nologin mysql
修改/etc/my.cnf配置文件，如果当期没有，则copy一个 copy,先进入mysql cd /application/mysql cp support-files/my-default.cnf /etc/my.cnf 然后使用vi或者vim进行修改，centos好像不支持vim命令 本地采用配置文件如下
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[client]
port = 3306
socket = /tmp/mysql.sock
default-character-set = utf8mb4
[mysql]
prompt="MySQL [\d]> "
no-auto-rehash
[mysqld]
port = 3306
socket = /tmp/mysql.sock
basedir = /application/mysql
datadir = /application/mysql/var
pid-file = /application/mysql/var/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1
init-connect = 'SET NAMES utf8mb4'
character-set-server = utf8mb4
skip-name-resolve
#skip-networking
back_log = 300
max_connections = 330
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 500M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 8M
key_buffer_size = 4M
thread_cache_size = 8
query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M
ft_min_word_len = 4
log_bin = mysql-bin
binlog_format = mixed
expire_logs_days = 7
log_error = /application/mysql/var/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /application/mysql/var/mysql-slow.log
performance_schema = 0
explicit_defaults_for_timestamp
#lower_case_table_names = 1
skip-external-locking
default_storage_engine = InnoDB
innodb_file_per_table = 1
innodb_open_files = 500
innodb_buffer_pool_size = 64M
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_thread_concurrency = 0
innodb_purge_threads = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 32M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120
bulk_insert_buffer_size = 8M
myisam_sort_buffer_size = 8M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1
interactive_timeout = 28800
wait_timeout = 28800
[mysqldump]
quick
max_allowed_packet = 500M
[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M
其中安装目录是/application/mysql 数据源目录是/application/mysql/var copy server配置文件 cp support-files/mysql.server /etc/init.d/mysqld vi /etc/init.d/mysqld //编辑或者修改 basedir=/application/mysql datadir=/application/mysql/var
在mysql目录下执行 bin/mysqld –initialize –user=mysql –basedir=/application/mysql –datadir=/application/mysql/var 会报错，解决办法，使用yum命令加载libaio必要 yum install libaio* yum -y install libaio.so.1 执行这两个后再执行 bin/mysqld –initialize –user=mysql –basedir=/application/mysql –datadir=/application/mysql/var
修改进入mysql密码，在新版本mysql数据库中，默认用户root密码已经指定成为一个随机，所以直接用 root登录会报错，解决办法
在mysql关闭情况下，执行 /etc/init.d/mysqld start –skip-grant-tables 执行成功后就可以通过该命令进入到mysql控制台 bin/mysql -u root mysql 接下来进行修改root密码 use mysql UPDATE user SET Password=PASSWORD(‘123456’) where USER=’root’; FLUSH PRIVILEGES;
在执行update的时候会报错 需要在my.cnf中加上 一行skip-grant-tables 或者用下面命令 /etc/init.d/mysqld restart –skip-grant-tables
错误原因：mysql数据库下已经没有password这个字段了，password字段改成了authentication_string。 使用下面的语句进行更改密码 update mysql.user set authentication_string=PASSWORD(‘Test_12345’) where User=’root’;
flush privileges; MySQL5.7 设置的密码中必须至少包含一个大写字母、一个小写字母、一个特殊符号、一个数字， 密码长度至少为8个字符
退出重启mysql /etc/init.d/mysqld restart 在第一次登录进去后会被要求改密码，使用alter ALTER USER ‘root’@’localhost’IDENTIFIED BY ‘Test_1234’; 开放外网权限访问数据库
root使用密码从任何主机连接到mysql服务器 GRANT ALL PRIVILEGES ON . TO ‘root’@’%’ IDENTIFIED BY ‘Test_1234’ WITH GRANT OPTION; flush privileges; 如果你想允许用户root从ip为192.168.1.104的主机连接到mysql服务器 GRANT ALL PRIVILEGES ON . TO ‘myuser’@’192.168.1.104′ IDENTIFIED BY ‘admin123′ WITH GRANT OPTION; flush privileges;
