1.cmake时报错要安装openssl包，yum install openssl-devel
2.重启虚拟机之后，卡在进度条那里进不去，解决办法：
(1) 启动虚拟机，出现倒数321时，按e，然后进入
（2）接着按e，进入kernel
（3）接着按e，进入
（4）可以删除rhgb quiet，加上rdshell，点击回车，点击b可以看到
（5）根据提示，重启进入kernel后，在后面加上selinux=0，再点击回车，点击b，就可以正常启动了
3、在复制my-default.cnf文件到my.cnf时报错，没有my-default.cnf文件这个文件，是因为从5.7.18开始不在二进制包中提供my-default.cnf文件，所以需要我们手动在my.cnf添加，下面是我从其他版本myslq中复制出来的，可以直接使用，或者不用这个，自己进行配置，记得前面要加[mysqld]
# For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [mysqld] # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... # port = ..... # server_id = ..... # socket = ..... # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES