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在CentOS中默认安装有MariaDB,是MySQL的一个分支,主要由开源社区维护。
CentOS 7及以上版本已经不再使用MySQL数据库,而是使用MariaDB数据库。
如果直接安装MySQL,会和MariaDB的文件冲突。
因此,需要先卸载自带的MariaDB,再安装MySQL。
[root@localhost ~]# rpm -qa|grep mariadb
[root@localhost ~]# rpm -e --nodeps 文件名
[root@localhost ~]# rpm -qa|grep mariadb
下载资源包:下载地址:MySQL :: Download MySQL Installer (Archived Versions)
选择自己需要的版本下载
用Xftp 7工具直接拖拽
在Xftp 7里面创建install,直接把MySQL拖到install里面
然后就可以到Xshell里面查看
[root@localhost install]# tar -Jxvf 文件名 -C ../soft/ ---- 解压
[root@localhost soft]# mv mysql-8.0.30-linux-glibc2.12-x86_64/ mysql8 --- 重命名
[root@localhost mysql8]# mkdir -p /opt/soft/mysql8/datas
[root@localhost mysql8]# groupadd mysql
[root@localhost mysql8]# useradd -r -g mysql mysql --- 创建用户指定用户组
[root@localhost mysql8]# chown -R mysql:mysql /opt/soft/mysql8/datas
[root@localhost mysql8]# chmod -R 770 /opt/soft/mysql8/datas
添加PATH变量后,可在全局使用MySQL。
[root@localhost mysql8]# vim /etc/profile
vim可能需要安装(yum -y install vim)
在最后面加上变量的命令
- #Mysql
- export PATH=$PATH:/opt/soft/mysql8/bin
执行命令使其生效
[root@localhost mysql8]# source /etc/profile
在/data/software/mysql8/
下,创建my.cnf
配置文件,用于初始化MySQL数据库
[root@localhost mysql8]# vim my.cnf
[mysql] # 默认字符集 default-character-set=utf8mb4 [client] port = 3306 socket = /tmp/mysql.sock [mysqld] port = 3306 server-id = 3306 user = mysql socket = /tmp/mysql.sock # 安装目录 basedir = /opt/soft/mysql8 # 数据存放目录 datadir = /opt/soft/mysql8/datas/mysql log-bin = /opt/soft/mysql8/datas/mysql/mysql-bin innodb_data_home_dir =/opt/soft/mysql8/datas/mysql innodb_log_group_home_dir =/opt/soft/mysql8/datas/mysql #日志及进程数据的存放目录 log-error =/opt/soft/mysql8/datas/mysql/mysql.log pid-file =/opt/soft/mysql8/datas/mysql/mysql.pid # 服务端使用的字符集默认为8比特编码 character-set-server=utf8mb4 lower_case_table_names=1 autocommit =1 ##################以上要修改的######################## skip-external-locking key_buffer_size = 256M max_allowed_packet = 1M table_open_cache = 1024 sort_buffer_size = 4M net_buffer_length = 8K read_buffer_size = 4M read_rnd_buffer_size = 512K myisam_sort_buffer_size = 64M thread_cache_size = 128 #query_cache_size = 128M tmp_table_size = 128M explicit_defaults_for_timestamp = true max_connections = 500 max_connect_errors = 100 open_files_limit = 65535 binlog_format=mixed binlog_expire_logs_seconds =864000 # 创建新表时将使用的默认存储引擎 default_storage_engine = InnoDB innodb_data_file_path = ibdata1:10M:autoextend innodb_buffer_pool_size = 1024M innodb_log_file_size = 256M innodb_log_buffer_size = 8M innodb_flush_log_at_trx_commit = 1 innodb_lock_wait_timeout = 50 transaction-isolation=READ-COMMITTED [mysqldump] quick max_allowed_packet = 16M [myisamchk] key_buffer_size = 256M sort_buffer_size = 4M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout
[root@localhost mysql8]# mysqld --defaults-file=/opt/soft/mysql8/my.cnf --basedir=/opt/soft/mysql8/ --datadir=/opt/soft/mysql8/datas/mysql --user=mysql --initialize-insecure
[root@localhost mysql8]# mysqld_safe --defaults-file=/opt/soft/mysql8/my.cnf &
[root@localhost tmp]# mysqladmin -uroot -proot shutdown
[root@localhost tmp]# ps -ef | grep mysql
如果是这样则为启动成功
[root@localhost mysql8]# mysql -uroot --skip-password
看见下面有mysql>则为登录成功
[root@localhost mysql8]# mysql -uroot -p
mysql> alter user 'root'@'localhost' identified with mysql_native_password by '123456';
mysql> update user set user.Host='%' where user.User='root';
在SQLyog上面测试远程登录情况,出现下面界面则为设置成功
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