linux CentOS 7 安装mysql5.7 遇到的问题
mysql 5.7.19；官网下载地址：http://dev.mysql.com/downloads/mysql/
安装过程参考：http://blog.****.net/shuai825644975/article/details/54315424
安装问题：
1、执行 sudo rpm -ivh --force mysql-xxxx 命令
报错：error: Failed dependencies: xxx
在命令后加：--nodeps --force；如：sudo rpm -ivh --force mysql-community-libs-5.7.19-1.el6.x86_64.rpm --nodeps --force
2、启动、停止、重启命令
systemctl start mysqld
systemctl stop mysqld
systemctl restart mysqld
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启动问题：
启动可能会提示：Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
可执行systemctl status mysqld.servic 或journalctl -xe 查看详情
1、没有libaio.so.1包
/usr/sbin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
64位系统安装：
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/libaio-0.3.107-10.el6.x86_64.rpm
rpm -ivh libaio-0.3.107-10.el6.x86_64.rpm
32位系统安装（yum默认安装32位）：
yum install libaio.so.1
2、explicit_defaults_for_timestamp
TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp serve
修改my.conf文件
路径：/etc/my.conf
增加一句：explicit_defaults_for_timestamp=true
3、数据空间已有东西存在
--initialize specified but the data directory has files in it. Aborting.
查看并进入/etc/my.cnf文件的datadir配置路径
我是新装mysql，所以直接删除全部；如果你已有数据存在，请做好备份
以上异常、警告解决后，mysql可以正常启动