Centos7安装Mysql5.7方法总结 - 实操手册

Centos7.x版本下针对Mysql的安装和使用多少跟之前的Centos6之前版本有所不同的，废话就不多赘述了，下面介绍下在centos7.x环境里安装mysql5.7的几种方法：
一、yum方式安装

Centos7.x版本下针对Mysql的安装和使用多少跟之前的Centos6之前版本有所不同的，废话就不多赘述了，下面介绍下在centos7.x环境里安装mysql5.7的几种方法：
一、yum方式安装

从CentOS 7.0发布以来，yum源中开始使用Mariadb来代替MySQL的安装。即使你输入的是yum install -y mysql , 显示的也是Mariadb的安装内容。
使用源代码进行编译安装又太麻烦。因此，如果想使用yum安装MySQL的话，就需要去下载官方指定的yum源.

yum下载网址为：https://dev.mysql.com/downloads/repo/yum/
找到Red Hat Enterprise Linux 7 / Oracle Linux 7 (Architecture Independent), RPM Package，单击后面的Download，
在新的页面中单击最下面的No thanks, just start my download.就可以下载到yum源了。 

1）安装MySQL YUM资源库
[root@kevin ~]# yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

2）安装MySQL 5.7
[root@kevin ~]# yum install -y mysql-community-server

3）启动MySQL服务器和MySQL的自动启动
[root@kevin ~]# systemctl start mysqld.service
[root@kevin ~]# systemctl enable mysqld.service

4）密码问题
由于MySQL从5.7开始不允许首次安装后使用空密码进行登录！为了加强安全性，系统会随机生成一个密码以供管理员首次登录使用，
这个密码记录在/var/log/mysqld.log文件中，使用下面的命令可以查看此密码：
[root@kevin ~]# cat /var/log/mysqld.log|grep 'A temporary password'
2018-01-24T02:32:20.210903Z 1 [Note] A temporary password is generated for root@localhost: DOqInortw9/<

最后一行冒号后面的部分DOqInortw9/<就是初始密码。
使用此密码登录MySQL:
[root@kevin ~]# mysql -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.21

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.

使用随机生产的密码登录到服务端后，必须马上修改密码，不然会报如下错误：
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

有两种方法解决上面的报错（如下的123456是修改后的密码）：
mysql> set password=password("123456");
或者
mysql> alter user 'root'@'localhost' identified by '123456';

刷新权限
mysql> flush privileges;

===============================================================================================
如果上面在执行set password=password("123456");命令后出现下面的报错：
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

解决办法：
这个与Mysql 密码安全策略validate_password_policy的值有关，validate_password_policy可以取0、1、2三个值：
0 or LOW       Length
1 or MEDIUM    Length; numeric, lowercase/uppercase, and special characters
2 or STRONG    Length; numeric, lowercase/uppercase, and special characters; dictionary

默认的数值是1，符合长度，且必须含有数字，小写或大写字母，特殊字符。
所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。

有时候，只是为了自己测试，不想密码设置得那么复杂，譬如说，我只想设置root的密码为123456。
必须修改两个全局参数：
mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)

修改上面两个参数后，就可以解决这个报错了。
=======================================================================================================

注意一点：
mysql5.7之后的数据库里mysql.user表里已经没有password这个字段了，password字段改成了authentication_string。
所以修改密码的命令如下：

mysql> update mysql.user set authentication_string=password('kevin@123') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql>

=======================================================================================================

查看mysql版本
mysql> select version();
+-----------+
| version() |
+-----------+
| 5.7.21    |
+-----------+
1 row in set (0.00 sec)

mysql>

=======================================================================================================
修改mysql5.7的编码由latin1为utf8

默认编码：
mysql> show variables like "%character%";show variables like "%collation%";
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| collation_connection | utf8_general_ci   |
| collation_database   | latin1_swedish_ci |
| collation_server     | latin1_swedish_ci |
+----------------------+-------------------+
3 rows in set (0.01 sec)

调整操作：
[root@kevin ~]# cat /etc/my.cnf
......
[mysqld]
......
character-set-server=utf8                //注意这个不能写成default-character-set=utf8，否则会导致5.7版本mysql无法打开

[client]
default-character-set=utf8

[root@kevin~]# systemctl restart mysqld.service
[root@kevin~]# mysql -p
......
mysql> show variables like "%character%";show variables like "%collation%";
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)

+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database   | utf8_general_ci |
| collation_server     | utf8_general_ci |
+----------------------+-----------------+
3 rows in set (0.00 sec)

mysql>

二、RPM包方式安装

1）卸载系统自带的 mysql和mariadb-lib
[root@kevin ~]# /bin/rpm -e $(/bin/rpm -qa | grep mysql|xargs) --nodeps
[root@kevin ~]# /bin/rpm -e $(/bin/rpm -qa | grep mariadb|xargs) --nodeps

2）下载mysql5.7.21 rpm安装包
下载地址：http://ftp.ntu.edu.tw/MySQL/Downloads/MySQL-5.7/
[root@kevin ~]# wget http://ftp.ntu.edu.tw/MySQL/Downloads/MySQL-5.7/mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar
[root@kevin ~]# tar -vxf mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar
[root@kevin ~]# ll
总用量 1160052
-rw-------. 1 root root       2090 1月  24 02:35 anaconda-ks.cfg
-rw-r--r--. 1 root root  593940480 12月 28 21:03 mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar
-rw-r--r--. 1 7155 31415  25107316 12月 28 20:53 mysql-community-client-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415    278844 12月 28 20:53 mysql-community-common-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415   3779988 12月 28 20:53 mysql-community-devel-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415  46256768 12月 28 20:53 mysql-community-embedded-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415  24078148 12月 28 20:53 mysql-community-embedded-compat-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415 128571868 12月 28 20:53 mysql-community-embedded-devel-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415   2238596 12月 28 20:53 mysql-community-libs-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415   2115904 12月 28 20:54 mysql-community-libs-compat-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415  55662616 12月 28 20:54 mysql-community-minimal-debuginfo-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415 171890056 12月 28 20:54 mysql-community-server-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415  15289580 12月 28 20:54 mysql-community-server-minimal-5.7.21-1.el7.x86_64.rpm
-rw-r--r--. 1 7155 31415 118654584 12月 28 20:54 mysql-community-test-5.7.21-1.el7.x86_64.rpm

依次执行（几个包有依赖关系，所以执行有先后）下面命令安装
[root@kevin ~]# rpm -ivh mysql-community-common-5.7.21-1.el7.x86_64.rpm --force
[root@kevin ~]# rpm -ivh mysql-community-libs-5.7.21-1.el7.x86_64.rpm --force
[root@kevin ~]# rpm -ivh mysql-community-client-5.7.21-1.el7.x86_64.rpm --force
[root@kevin ~]# rpm -ivh mysql-community-server-5.7.21-1.el7.x86_64.rpm --force

=============================================================================================================
可能在安装mysql-community-server-5.7.21-1.el7.x86_64.rpm的时候会有如下报错：
[root@kevin ~]# rpm -ivh mysql-community-server-5.7.21-1.el7.x86_64.rpm --force
warning: mysql-community-server-5.7.21-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
libaio.so.1()(64bit) is needed by mysql-community-server-5.7.21-1.el7.x86_64
libaio.so.1(LIBAIO_0.1)(64bit) is needed by mysql-community-server-5.7.21-1.el7.x86_64
libaio.so.1(LIBAIO_0.4)(64bit) is needed by mysql-community-server-5.7.21-1.el7.x86_64
net-tools is needed by mysql-community-server-5.7.21-1.el7.x86_64  

这个报错的意思是需要安装libaio包和net-tools包：

安装libaio-0.3.107-10.el6.x86_64.rpm
[root@kevin ~]# wget http://mirror.centos.org/centos/6/os/x86_64/Packages/libaio-0.3.107-10.el6.x86_64.rpm
[root@kevin ~]# rpm -ivh libaio-0.3.107-10.el6.x86_64.rpm --force

安装net-tools
[root@kevin ~]# yum install net-tools
=============================================================================================================

使用rpm安装方式安装mysql，安装的路径如下：
数据库目录
/var/lib/mysql/

配置文件
/usr/share/mysql(mysql.server命令及配置文件)
/etc/my.cnf

相关命令
/usr/bin(mysqladmin mysqldump等命令)

启动脚本
/etc/rc.d/init.d/(启动脚本文件mysql的目录)

3）数据库初始化
为了保证数据库目录为与文件的所有者为 mysql 登陆用户，如果你是以 root 身份运行 mysql 服务，需要执行下面的命令初始化
[root@kevin ~]# mysql_install_db --datadir=/var/lib/mysql      //必须指定datadir,执行后会生成~/.mysql_secret密码文件
[root@kevin ~]# mysqld --initialize --user=mysql      //新版的推荐此方法，执行生会在/var/log/mysqld.log生成随机密码。如果是以mysql身份运行，则可以去掉--user选项。

4）更改mysql数据库目录的所属用户及其所属组，然后启动mysql数据库
[root@kevin ~]# chown mysql:mysql /var/lib/mysql -R
[root@kevin ~]# systemctl start mysqld.service            //启动mysql数据库服务

5）根据第3步中的密码登录到mysql，更改root用户的密码，新版的mysql在第一次登录后更改密码前是不能执行任何命令的

另外--initialize 选项默认以“安全”模式来初始化，则会为 root 用户生成一个密码并将该密码标记为过期，登陆后你需要设置一个新的密码，
而使用--initialize-insecure命令则不使用安全模式，则不会为 root 用户生成一个密码。  

这里演示使用的--initialize初始化的，会生成一个 root 账户密码，密码在log文件里，如下最后的")1r3gi,hjgQa"即为随即生成的root密码
[root@kevin ~]# cat /var/log/mysqld.log
.......
07T04:41:58.420558Z 1 [Note] A temporary password is generated for root@localhost: )1r3gi,hjgQa  

[root@kevin ~]# mysql -uroot -p')1r3gi,hjgQa'
mysql> set password=password('kevin@123');
mysql> flush privileges

#######  报错问题  #######

=========================================================================
在进行mysql初始化的时候可能会报错：
[root@kevin ~]# mysqld --initialize --user=mysql
2020-03-31T03:10:23.077618Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2020-03-31T03:10:23.079134Z 0 [ERROR] --initialize specified but the data directory has files in it. Aborting.
2020-03-31T03:10:23.079159Z 0 [ERROR] Aborting

上面出现Warning的解决办法：
在my.cnf文件中加上" explicit_defaults_for_timestamp=true", 然后重启mysql服务就可以了。

上面出现ERROR的解决办法：
报这个错误的原因是因为mysql数据库已经进行初始化了，所以不能用这种方式再进行初始化用户了，因为mysql在初始化的时候会自动创建一个root用户的。
首先保证mysql处于停止状态，然后执行：
# cd /var/lib
# mv mysql mysql_bak
# > /var/log/mysqld.log
然后再次执行初始化
# mysqld --initialize --user=mysql

=========================================================================
rpm安装的时候报错：
mariadb-libs is obsoleted by mysql-community-libs-compat-5.7.21-1.el7.x86_64

如上的报错，由于centos 7默认是mariadb数据库，再去安装mysql之前要先下载mariadb
# rpm -e `rpm -qa | grep mariadb|xargs` --nodeps

三、编译方式安装

1）卸载系统自带的 mysql和mariadb-lib
[root@kevin ~]# /bin/rpm -e $(/bin/rpm -qa | grep mysql|xargs) --nodeps
[root@kevin ~]# /bin/rpm -e $(/bin/rpm -qa | grep mariadb|xargs) --nodeps

2）安装编译代码需要的包
/usr/bin/yum -y install make gcc-c++ cmake bison-devel ncurses-devel
[root@kevin ~]#

3）安装boost
[root@kevin ~]# mkdir -p /usr/local/boost
[root@kevin ~]# cd /usr/local/boost
[root@kevin boost]# wget http://www.sourceforge.net/projects/boost/files/boost/1.59.0/boost_1_59_0.tar.gz
[root@kevin boost]# tar -zvxf boost_1_59_0.tar.gz

4）编译安装mysql5.7.21
[root@kevin ~]# /usr/sbin/groupadd mysql
[root@kevin ~]# /usr/sbin/useradd -g mysql mysql -M -s /sbin/nologin
[root@kevin ~]# cd /usr/local/src
[root@kevin src]# wget -c http://ftp.ntu.edu.tw/MySQL/Downloads/MySQL-5.7/mysql-5.7.21.tar.gz
[root@kevin src]# /bin/tar -zxvf mysql-5.7.21.tar.gz
[root@kevin src]# cd mysql-5.7.21/
[root@kevin mysql-5.7.21]# /usr/bin/cmake -DCMAKE_INSTALL_PREFIX=/data/mysql -DMYSQL_DATADIR=/data/mysql/data -DSYSCONFDIR=/etc
-DWITH_MYISAM_STORAGE_ENGINE=1 -DWITH_INNOBASE_STORAGE_ENGINE=1 -DWITH_MEMORY_STORAGE_ENGINE=1 -DWITH_READLINE=1
-DMYSQL_UNIX_ADDR=/var/lib/mysql/mysql.sock -DMYSQL_TCP_PORT=3306 -DENABLED_LOCAL_INFILE=1 -DWITH_PARTITION_STORAGE_ENGINE=1
-DEXTRA_CHARSETS=all -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_BOOST=/usr/local/boost

[root@kevin mysql-5.7.21]# make && make install

5）修改/data/mysql权限
[root@kevin mysql-5.7.21]# mkdir -p /data/mysql/data
[root@kevin mysql-5.7.21]# /bin/chown -R mysql:mysql /data/mysql
[root@kevin mysql-5.7.21]# /bin/chown -R mysql:mysql /data/mysql/data

6）执行初始化配置脚本，创建系统自带的数据库和表
[root@kevin mysql-5.7.21]# /data/mysql/bin/mysql_install_db --basedir=/data/mysql --datadir=/data/mysql/data --user=mysql

7）配置my.cnf
[root@kevin mysql-5.7.21]# cat /data/mysql/my.cnf
[client]
port = 3306
socket = /data/mysql/var/mysql.sock

[mysqld]
port = 3306
socket = /data/mysql/var/mysql.sock

basedir = /data/mysql/
datadir = /data/mysql/data
pid-file = /data/mysql/data/mysql.pid
user = mysql
bind-address = 0.0.0.0
server-id = 1
sync_binlog=1
log_bin = mysql-bin

skip-name-resolve
#skip-networking
back_log = 600

max_connections = 3000
max_connect_errors = 3000
##open_files_limit = 65535
table_open_cache = 512
max_allowed_packet = 16M
binlog_cache_size = 16M
max_heap_table_size = 16M
tmp_table_size = 256M

read_buffer_size = 1024M
read_rnd_buffer_size = 1024M
sort_buffer_size = 1024M
join_buffer_size = 1024M
key_buffer_size = 8192M

thread_cache_size = 8

query_cache_size = 512M
query_cache_limit = 1024M

ft_min_word_len = 4

binlog_format = mixed
expire_logs_days = 30

log_error = /data/mysql/data/mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = /data/mysql/data/mysql-slow.log

performance_schema = 0
explicit_defaults_for_timestamp

##lower_case_table_names = 1

skip-external-locking

default_storage_engine = InnoDB
##default-storage-engine = MyISAM
innodb_file_per_table = 1
innodb_open_files = 500
innodb_buffer_pool_size = 40960M
innodb_write_io_threads = 1000
innodb_read_io_threads = 1000
innodb_thread_concurrency = 8
innodb_purge_threads = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 4M
innodb_log_file_size = 32M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120

bulk_insert_buffer_size = 8M
#myisam_sort_buffer_size = 8M
#myisam_max_sort_file_size = 1G
#myisam_repair_threads = 1

interactive_timeout = 28800
wait_timeout = 28800

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
port = 3306

8) 启动mysql服务
[root@kevin mysql-5.7.21]# cd /data/mysql
[root@kevin mysql]# /bin/mkdir var
[root@kevin mysql]# /bin/chown -R mysql.mysql var
[root@kevin mysql]# cp support-files/mysql.server /etc/init.d/mysql
[root@kevin mysql]# /sbin/chkconfig mysql on
[root@kevin mysql]# service mysql start

9) 设置环境变量
[root@kevin mysql]# echo "export PATH=$PATH:/data/mysql/bin" >> /etc/profile
[root@kevin mysql]# source /etc/profile

10）设置mysql登陆密码,初始密码为nextcloud@123
[root@kevin mysql]# /bin/mkdir -p /var/lib/mysql
[root@kevin mysql]# ln -s /data/mysql/var/mysql.sock /var/lib/mysql/mysql.sock

11）修改密码
由于MySQL从5.7开始不允许首次安装后默认使用空密码进行登录！并且mysql5.7之后的数据库里mysql.user表里已经没有password这个字段了，
password字段改成了authentication_string。
所以修改密码的命令如下：
[root@kevin mysql]# vim /data/mysql/my.cnf
......
[mysqld]
......
skip-grant-tables                //先设置无密码登陆

[root@kevin mysql]# service mysql restart
[root@kevin mysql]# mysql -p
mysql> update mysql.user set authentication_string=password('kevin@123') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql>

然后再将/data/mysql/my.cnf配置文件中的"skip-grant-tables"去掉，重启mysql服务，就可以使用上面重置后的新密码kevin@123登陆了！

===================================================================================================
温馨提示:
如果是mysql5.7.23版本, 则就不能使用mysql_install_db进行初始化了, 需要使用mysqld --initialize!

[root@lamp-new mysql-5.7.23]# /data/mysql/bin/mysql_install_db --basedir=/data/mysql --datadir=/data/mysql/data --user=mysql
2018-11-22 14:16:02 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2018-11-22 14:16:18 [WARNING] The bootstrap log isn't empty:
2018-11-22 14:16:18 [WARNING] 2018-11-22T06:16:02.633498Z 0 [Warning] --bootstrap is deprecated. Please consider using --initialize instead
2018-11-22T06:16:02.645463Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2018-11-22T06:16:02.645476Z 0 [Warning] Changed limits: table_open_cache: 431 (requested 2000)

可以看到mysql_install_db is deprecated，说不赞同使用mysql_install_db，推荐使用的方法是：
Please consider switching to mysqld --initialize ，Please consider using --initialize instead

所以正确的初始方式是使用mysqld --initialize, 而不是之前的mysql_install_db, mysql5.7新特性!!!!!
[root@lamp-new mysql]# /data/mysql/bin/mysqld --basedir=/data/mysql --datadir=/data/mysql/data --user=mysql --initialize
2018-11-22T06:25:33.481308Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2018-11-22T06:25:34.192747Z 0 [Warning] InnoDB: New log files created, LSN=45790
2018-11-22T06:25:34.473292Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2018-11-22T06:25:34.664979Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 6b50ba05-ee1f-11e8-afc3-005056880f83.
2018-11-22T06:25:34.689381Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2018-11-22T06:25:34.690649Z 1 [Note] A temporary password is generated for root@localhost: JR6wA4ezp3&M

注意上面:
MySQL 5.7初始化完后会生成一个临时的密码，A temporary password is generated for root@localhost: )vyd3aXj8hhC 如果想初始化表空间，
在后面加上 --innodb_data_file_path=ibdata1:1G:autoextend即可。

四、yum安装MariaDB

[root@kevin ~]# yum -y install mariadb mariadb-server
[root@kevin ~]# systemctl start mariadb
[root@kevin ~]# systemctl enable mariadb

接下来进行MariaDB的相关简单配置，设置密码，会提示先输入密码
[root@kevin ~]# mysql_secure_installation
首先是设置密码，会提示先输入密码

Enter current password for root (enter for none):<–初次运行直接回车

设置密码

Set root password? [Y/n] <– 是否设置root用户密码，输入y并回车或直接回车
New password: <– 设置root用户的密码
Re-enter new password: <– 再输入一次你设置的密码

其他配置
Remove anonymous users? [Y/n] <– 是否删除匿名用户，回车
Disallow root login remotely? [Y/n] <–是否禁止root远程登录,回车,
Remove test database and access to it? [Y/n] <– 是否删除test数据库，回车
Reload privilege tables now? [Y/n] <– 是否重新加载权限表，回车

[root@kevin ~]# mysql -p123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 5.5.56-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.01 sec)

MariaDB [(none)]>

接下来配置MariaDB的字符集:
-> 首先是配置文件/etc/my.cnf，在[mysqld]标签下添加
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake

-> 接着配置文件/etc/my.cnf.d/client.cnf，在[client]中添加
default-character-set=utf8

-> 然后配置文件/etc/my.cnf.d/mysql-clients.cnf，在[mysql]中添加
default-character-set=utf8

最后是重启MariaDB，并登陆MariaDB查看字符集
[root@test-vm001 my.cnf.d]# systemctl restart mariadb

[root@kevin ~]# mysql -p123456
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 5.5.56-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show variables like "%character%";show variables like "%collation%";
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_unicode_ci |
| collation_database   | utf8_unicode_ci |
| collation_server     | utf8_unicode_ci |
+----------------------+-----------------+
3 rows in set (0.00 sec)

MariaDB [(none)]>

为Confluence创建对应的数据库、用户名和密码
MariaDB [(none)]> create database confluence default character set utf8 collate utf8_bin;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> grant all on confluence.* to 'confluence'@'%' identified by 'confluencepasswd';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)