1、报错如下：
CMake Error at cmake/boost.cmake:76 (MESSAGE):
  You can download it with -DDOWNLOAD_BOOST=1 -DWITH_BOOST=<directory>
 
  This CMake script will look for boost in <directory>.  If it is not there,
  it will download and unpack it (in that directory) for you.
 
  If you are inside a firewall, you may need to use an http proxy:
 
  export http_proxy=http://example.com:80
 
Call Stack (most recent call first):
  cmake/boost.cmake:228 (COULD_NOT_FIND_BOOST)
  CMakeLists.txt:435 (INCLUDE)
 
 
-- Configuring incomplete, errors occurred!
See also "/byrd/tools/mysql-5.7.9/CMakeFiles/CMakeOutput.log".
解决方法：编译时添加红色部分
cmake . -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR} \
-DDEFAULT_CHARSET=UTF8 \
-DDEFAULT_COLLATION=utf8_general_ci \
-DENABLED_LOCAL_INFILE=ON \
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
-DWITH_FEDERATED_STORAGE_ENGINE=1 \
-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \
-DWITHOUT_EXAMPLE_STORAGE_ENGINE=1 \
-DWITH_PARTITION_STORAGE_ENGINE=1 \
-DWITH_PERFSCHEMA_STORAGE_ENGINE=1 \
-DCOMPILATION_COMMENT='dxmysql' \
-DWITH_READLINE=ON \
-DSYSCONFDIR=/mysqldata/3306 \
-DDOWNLOAD_BOOST=1 \
-DWITH_BOOST=/usr/local/boost \
-DMYSQL_UNIX_ADDR=/mysqldata/3306/mysql.sock

2、报错如下：
[root@oracle mysql]# bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql --datadir=/mysqldata/3306/data
2018-11-07T08:41:21.959792Z 0 [Warning] 'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
2018-11-07T08:41:21.959848Z 0 [Warning] 'NO_AUTO_CREATE_USER' sql mode was not set.
2018-11-07T08:41:21.961486Z 0 [ERROR] --initialize specified but the data directory has files in it. Aborting.
解决方法：清空数据目录,再执行初始化命令即可
rm -fr /mysqldata/3306/data/*

3、修改密码时报错如下：
(root@localhost) [mysql]> update user set password=password("newpassword") where user='root';
ERROR 1054 (42S22): Unknown column 'password' in 'field list
解决方法：mysql5.7.x数据库下已经没有password这个字段了，password字段改成了authentication_string，即可
(root@localhost) [mysql]> update mysql.user set authentication_string=password('root') where user='root' ;

4、service mysql start时报错如下：

[root@pdata-svr115 local]# service mysql start
Starting MySQL... ERROR! The server quit without updating PID file (/mysqldata/3306/mysql.pid).
解决方法：

1.可能是/usr/local/mysql/data/rekfan.pid文件没有写的权限
解决方法 ：给予权限，执行 “chown -R mysql:mysql /var/data” “chmod -R 755 /usr/local/mysql/data”  然后重新启动mysqld！

2.可能进程里已经存在mysql进程
解决方法：用命令“ps -ef|grep mysqld”查看是否有mysqld进程，如果有使用“kill -9  进程号”杀死，然后重新启动mysqld！

3.可能是第二次在机器上安装mysql，有残余数据影响了服务的启动。
解决方法：去mysql的数据目录/data看看，如果存在mysql-bin.index，就赶快把它删除掉吧，它就是罪魁祸首了。本人就是使用第三条方法解决的 ！http://blog.rekfan.com/?p=186

4.mysql在启动时没有指定配置文件时会使用/etc/my.cnf配置文件，请打开这个文件查看在[mysqld]节下有没有指定数据目录(datadir)。
解决方法：请在[mysqld]下设置这一行：datadir = /usr/local/mysql/data

5.skip-federated字段问题
解决方法：检查一下my.cnf文件中有没有没被注释掉的skip-federated字段，如果有就立即注释掉吧。

6.错误日志目录不存在
解决方法：使用“chown” “chmod”命令赋予mysql所有者及权限

7.selinux惹的祸，如果是centos系统，默认会开启selinux
解决方法：关闭它，打开/etc/selinux/config，把SELINUX=enforcing改为SELINUX=disabled后存盘退出重启机器试试。

我解决的方法是注释掉my.cnf文件不适用的字段,一下是文件内容可供参考：

#The MySQL client
[client]
port=3306
socket=/mysqldata/3306/mysql.sock
#default-charcter-set=utf8#The MySQL server
[mysqld]
port=3306
user=mysql
socket=/mysqldata/3306/mysql.sock
pid-file=/mysqldata/3306/mysql.pid
basedir=/usr/local/mysql
datadir=/mysqldata/3306/data
tmpdir=/mysqldata/3306/tmp
open_files_limit=10240
explicit_defaults_for_timestamp#Buffer
max_allowed_packet=256M
max_heap_table_size=256M
net_buffer_length=8K
sort_buffer_size=2M
join_buffer_size=4M
read_buffer_size=2M
read_rnd_buffer_size=16M#Log
log-bin=/mysqldata/3306/binlog/mysql-bin
binlog_cache_size=32M
max_binlog_cache_size=512M
max_binlog_size=512M
binlog_format=mixed
log_output=FILE
log-error=../mysql-error.log
slow_query_log=1
slow_query_log_file=../slow_query.log
general_log=0
general_log_file=../general_query.log
expire-logs-days=14#InnoDB
innodb_data_file_path=ibdata1:2048M:autoextend
innodb_log_file_size=256M
innodb_log_files_in_group=3
innodb_buffer_pool_size=1024M
character-set-server=utf8#sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLESserver-id=1
max_connections=1000
wait_timeout=30
interactive_timeout = 30
lower_case_table_names=1
#skip-grant-tables[mysql]
no-auto-rehash
prompt=(\u@\h) [\d]>\_
#default-character-set=utf8
##character_set_server=utf8