MySQL5.7升级到8.0过程详解

# 安装包上传至原安装包目录下 我的是/usr/local/
cd /usr/local/
# 解压安装包
xz -d mysql-8.0.19-linux-glibc2.12-x86_64.tar.xz
tar -xvf mysql-8.0.19-linux-glibc2.12-x86_64.tar

# 文件夹重命名为mysql8
mv mysql-8.0.19-linux-glibc2.12-x86_64 mysql8

# 更改文件夹所属
chown -R mysql.mysql /usr/local/mysql8/

# 最后几个for8.0的参数要格外注意
[mysqld]
user = mysql
datadir = /data/mysql/data
port = 3306               
socket = /data/mysql/tmp/mysql.sock
pid-file  = /data/mysql/tmp/mysqld.pid
tmpdir = /data/mysql/tmp
skip_name_resolve = 1
max_connections = 2000
group_concat_max_len = 1024000
lower_case_table_names = 1
log_timestamps=SYSTEM
max_allowed_packet = 32M
binlog_cache_size = 4M
sort_buffer_size = 2M
read_buffer_size = 4M
join_buffer_size = 4M
tmp_table_size = 96M
max_heap_table_size = 96M
max_length_for_sort_data = 8096
default_time_zone = '+8:00'

#logs
server-id = 1003306
log-error = /data/mysql/logs/error.log
slow_query_log = 1
slow_query_log_file = /data/mysql/logs/slow.log
long_query_time = 3
log-bin = /data/mysql/logs/binlog
binlog_format = row
log_bin_trust_function_creators = 1
gtid_mode = ON
enforce_gtid_consistency = ON

#for8.0
sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
character-set-server = utf8
collation_server = utf8_general_ci
basedir = /usr/local/mysql8
skip_ssl
default_authentication_plugin=mysql_native_password

# 进入原5.7 mysql命令行 正确关闭数据库
mysql> select version();
+------------+
| version()  |
+------------+
| 5.7.23-log |
+------------+
1 row in set (0.00 sec)
mysql> show variables like 'innodb_fast_shutdown';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| innodb_fast_shutdown | 1     |
+----------------------+-------+
1 row in set (0.00 sec)
# 确保数据都刷到硬盘上，更改成0
mysql> set global innodb_fast_shutdown=0;
Query OK, 0 rows affected (0.00 sec)
mysql> shutdown;
Query OK, 0 rows affected (0.00 sec)
mysql> exit
Bye

# 退出至终端 用mysql8.0.19客户端直接启动
[root@centos ~]# /usr/local/mysql8/bin/mysqld_safe --defaults-file=/etc/my.cnf --user=mysql &
[1] 23333
[root@centos ~]# 2020-05-20T07:07:02.337626Z mysqld_safe Logging to '/data/mysql/logs/error.log'.
2020-05-20T07:07:02.366244Z mysqld_safe Starting mysqld daemon with databases from /data/mysql/data

# 可观察下错误日志看是否报错 然后重新登录测试
[root@centos ~]# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 17
Server version: 8.0.19 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.19    |
+-----------+
1 row in set (0.00 sec)

# 修改mysql服务启动项配置
vi /etc/init.d/mysql
# 修改basedir目录
basedir=/usr/local/mysql8

# 修改PATH变量
vi /etc/profile
# 将PATH中的/usr/local/mysql/bin改为/usr/local/mysql8/bin

# 生效验证
[root@centos ~]# source /etc/profile
[root@centos ~]# which mysql
/usr/local/mysql8/bin/mysql
[root@centos ~]# mysql -V
mysql  Ver 8.0.19 for linux-glibc2.12 on x86_64 (MySQL Community Server - GPL)