MySQL5.7安装

Tips：

关于MySQL版本选择、官网下载地址、相关系统配置等操作可以参照之前的博文,本文就不在赘述咯。

https://www.cnblogs.com/gjc592/p/9198323.html

本次进行MySQL5.7版本的安装，下面直奔主题，进行相关安装工作。

总体安装步骤概述如下：

操作系统等相关配置设置
安装依赖包
创建用户
修改配置文件、创建相关数据目录、日志目录等并授权
运行安装命令，启动数据库
配置环境变量、服务等（看需要）

因为我之前已经安装了MySQL5.6，本次继续在同一台机器上安装一个MySQL5.7版本的实例，相关配置及依赖包等操作之前已处理完毕，

现在就接着后续操作进行了。如果首次安装，需先进行配置。详情见https://www.cnblogs.com/gjc592/p/9198323.html

一、准备工作

# 安装必要依赖包

yum install -y libaio

# 创建用户

groupadd mysql

useradd -r -g mysql mysql

# 上传安装包至 /usr/local ,如上传至其他路径，以下操作过程中注意修改路径，或者在/usr/local目录创建软连接

#解压

tar -zxvf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz

# 创建软连接

ln -s mysql-5.7.22-linux-glibc2.12-x86_64 /usr/local/mysql5.7

# 修改目录权限

cd /usr/local

chown -R mysql:root mysql5.7

二、创建相关数据目录、日志目录、配置文件等并授权

# 创建相关目录

mkdir -p /data/mysql/mysql3307/{data,logs,etc,tmp}

# 配置文件

vi /data/mysql/mysql3307/etc/my3307.cnf

## 可以参考如下配置文件，注意根据自己的环境修改相关配置

[mysqld]

########basic settings########

server-id = 463307
port = 3307
user = mysql
character_set_server=utf8mb4
skip_name_resolve = 1
max_connections = 800
max_connect_errors = 1000
datadir = /data/mysql/mysql3307/data      #根据实际情况修改,建议和程序分离存放
transaction_isolation = READ-COMMITTED
explicit_defaults_for_timestamp = 1
join_buffer_size = 512M
tmp_table_size = 512M
tmpdir = /data/mysql/mysql3307/tmp
pid-file = /data/mysql/mysql3307/tmp/mysqld3307.pid
socket = /data/mysql/mysql3307/tmp/mysql3307.sock
max_allowed_packet = 128M
sql_mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER"
interactive_timeout = 1800
wait_timeout = 1800
read_buffer_size = 16M
read_rnd_buffer_size = 32M
sort_buffer_size = 32M
language = /usr/local/mysql5.7/share/english  ## 以后版本将取消该参数

########log settings########

log_error =/data/mysql/mysql3307/logs/mysqld3307.log
slow_query_log = 1
slow_query_log_file = /data/mysql/mysql3307/logs/slow.log
log_queries_not_using_indexes = 1
log_slow_admin_statements = 1
log_slow_slave_statements = 1
log_throttle_queries_not_using_indexes = 10
expire_logs_days = 3
long_query_time = 2
min_examined_row_limit = 100

########replication settings########

master_info_repository = TABLE
relay_log_info_repository = TABLE
log_bin = /data/mysql/mysql3307/logs/mysql_binlog
sync_binlog = 1
gtid_mode = on
enforce_gtid_consistency = 1
log_slave_updates
binlog_format = row
relay_log = /data/mysql/mysql3307/logs/relay.log
relay_log_recovery = 1
binlog_gtid_simple_recovery = 1
slave_skip_errors = ddl_exist_errors

########innodb settings########

innodb_page_size = 8192
innodb_buffer_pool_size = 1G    #根据实际情况修改
innodb_buffer_pool_instances = 8
innodb_buffer_pool_load_at_startup = 1
innodb_buffer_pool_dump_at_shutdown = 1
innodb_lru_scan_depth = 2000
innodb_lock_wait_timeout = 5
innodb_io_capacity = 4000
innodb_io_capacity_max = 8000
innodb_flush_method = O_DIRECT
innodb_file_format = Barracuda
innodb_file_format_max = Barracuda
innodb_log_group_home_dir = /data/mysql/mysql3307/logs/  #根据实际情况修改
innodb_undo_directory =  /data/mysql/mysql3307/logs/      #根据实际情况修改
innodb_undo_logs = 128
innodb_undo_tablespaces = 3
innodb_flush_neighbors = 1
innodb_log_file_size = 512M               #根据实际情况修改
innodb_log_buffer_size = 16777216
innodb_purge_threads = 4
innodb_large_prefix = 1
innodb_thread_concurrency = 64
innodb_print_all_deadlocks = 1
innodb_strict_mode = 1
innodb_sort_buffer_size = 67108864

########semi sync replication settings########

plugin_dir=/usr/local/mysql5.7/lib/plugin      #根据实际情况修改
plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so"
loose_rpl_semi_sync_master_enabled = 1
loose_rpl_semi_sync_slave_enabled = 1
loose_rpl_semi_sync_master_timeout = 5000

[mysqld-5.7]
innodb_buffer_pool_dump_pct = 40
innodb_page_cleaners = 4
innodb_undo_log_truncate = 1
innodb_max_undo_log_size = 1G
innodb_purge_rseg_truncate_frequency = 128
binlog_gtid_simple_recovery=1
log_timestamps=system
transaction_write_set_extraction=MURMUR32
show_compatibility_56=on

# 授权

chown -R mysql:mysql /data/mysql/mysql3307

三、安装及启动

1.指定本实例的配置文件进行安装

# 建议写全路径运行命令进行安装

/usr/local/mysql5.7/bin/mysqld --defaults-file=/data/mysql/mysql3307/etc/my3307.cnf --initialize --user=mysql

注意：mysql5.7安装后默认会产生一个临时密码，存放于错误日志里，可以查看错误日志进行查看

# 查看日志

vim /data/mysql/mysql3307/logs/mysqld3307.log

此时可以看到临时密码，并查看是否有错误产生

如果不想产生临时密码，可以运行如下命令进行操作，建议使用initialize产生随机密码（下面的语句只是科普使用，无需执行）

/usr/local/mysql5.7/bin/mysqld --defaults-file=/data/mysql/mysql3307/etc/my3307.cnf --initialize-insecure --user=mysql

即：使用--initialize生成随机密码，使用--initialize-insecure生成空密码。

注意：如果安装过程中出现错误，需要将 datadir及 logs下对应的文件删除，并将错误原因查出解决后再运行安装命令，否则将无法再次安装。

2. 启动MySQL实例

#启动数据库，并在后台运行（执行下面命令时多次回车，专为小白而备注）

/usr/local/mysql5.7/bin/mysqld_safe --defaults-file=/data/mysql/mysql3307/etc/my3307.cnf &