Linux下使用Systemd编译Mysql5.7.11
Systemd 是 Linux 系统工具，用来启动守护进程，已成为大多数发行版的标准配置，本篇文章重点为大家讲解一下Linux下使用Systemd编译Mysql5.7.11具体方法。
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安装依赖包
yum -y install make gcc-c++ cmake bison-devel ncurses-devel
下载mysql源码包
源码包有两种版本 ： mysql-5.7.11.tar.gz 不带 boost库 ，需要自行下载。
mysql-boost-5.7.11.tar.gz 自带 boost库，在解压后的根目录，推荐下载。 wget http://cdn.mysql.com/Downloads/MySQL-5.7/mysql-boost-5.7.11.tar.gz
curl -O http://cdn.mysql.com/Downloads/MySQL-5.7/mysql-boost-5.7.11.tar.gz
tar -zxf mysql-boost-5.7.11.tar.gz
cd mysql-5.7.11
编译
生成makefile“
cmake \ -DCMAKE_INSTALL_PREFIX=/usr/local/mysql \ -DMYSQL_DATADIR=/usr/local/mysql/data \ -DSYSCONFDIR=/etc \ -DWITH_MYISAM_STORAGE_ENGINE=1 \ -DWITH_INNOBASE_STORAGE_ENGINE=1 \ -DWITH_MEMORY_STORAGE_ENGINE=1 \ -DMYSQL_TCP_PORT=3306 \ -DENABLED_LOCAL_INFILE=1 \ -DWITH_PARTITION_STORAGE_ENGINE=1 \ -DEXTRA_CHARSETS=all \ -DDEFAULT_CHARSET=utf8 \ [字符集] -DDEFAULT_COLLATION=utf8_general_ci \ [排序规则 必须有，不然初始化数据库困难] -DDOWNLOAD_BOOST=1 \ [从MySQL 5.7.5开始Boost库是必需的] -DWITH_BOOST=/root/mysql-5.7.11/boost \ -DWITH_SYSTEMD=1 [支持Systemd] 加上-DWITH_SYSTEMD=1可以使用systemd控制mysql服务，默认是不开启systemd的。
然后 make -j 2 && make install mysql将会安装到/usr/local/mysql路径 慢慢等……
配置MySQL
添加mysql用户和组
groupadd mysql
useradd -g mysql -s /sbin/nologin mysql
修改/usr/local/mysql权限
chown -R mysql:mysql /usr/local/mysql
创建 mysql PID 默认目录
在 mysqld.service ，把默认的pid文件指定到了 /var/run/mysqld/ 目录，而并没有事先建立该目录，因此要手动建立该目录并把权限赋给 mysql 用户。 mkdir -p /var/run/mysqldchown mysql:mysql /var/run/mysqld
mysql 三个运行文件默认位置
log : /var/log/mysqld.logpid : /var/run/mysqld/mysqld.pidsock : /tmp/mysql.sock
拷贝 my.cnf 和 mysqld.service
cp support-files/my-default.cnf /etc/my.cnf
mysql 5.7 默认将 mysqld.service (/usr/local/mysql/)文件安装到了 mysql 安装目录下的 usr/lib/systemd/system/，将 mysqld.service 复制到/usr/lib/systemd/system/目录下 [root@localhost]/usr/local/mysql#cp usr/lib/systemd/system/mysqld.service /usr/lib/systemd/system
添加环境变量
— 编辑/etc/profile文件在最后添加如下两行 — “
vim /etc/profile
PATH=/usr/local/mysql/bin:$PATH export PATH
source /etc/profile
初始化 无密码 mysql 数据库
bin/mysqld --initialize-insecure --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/databin/mysql_ssl_rsa_setup 出现下列内容，初始化成功 2016-02-22T03:56:27.254356Z 1 [Warning] root@localhost is created with an empty password ! Please consider switching off the –initialize-insecure option.
-–initialize 会生成一个随机密码(保存在~/.mysql_secret)，而 -–initialize-insecure 不会生成密码，在MySQL安全配置向导mysql_secure_installation设置密码时，可自由选择 mysql 密码等级。
-–datadir目标目录下不能有数据文件。
之前版本初始化程序 mysql_install_db 是在 /usr/local/mysql/script 下，并会在将来被移除，转而使用mysqld替代 已被废弃 mysql5.7 放在了 /usr/local/mysql/bin 目录下。
启动 mysql
systemctl start mysqld.service
systemctl status mysqld.service
运行 MySQL安全配置向导mysql_secure_installation 设置密码，mysql 服务启动后才可执行
a)为root用户设置密码 b)删除匿名账号 c)取消root用户远程登录 d)删除test库和对test库的访问权限 e)刷新授权表使修改生效 [root@localhost mysql]# mysql_secure_installation
Securing the MySQL server deployment.
Connecting to MySQL using a blank password. [使用空密码连接到MySQL]
VALIDATE PASSWORD PLUGIN can be used to test passwords and improve security. It checks the strength of password and allows the users to set only those passwords which are secure enough. Would you like to setup VALIDATE PASSWORD plugin?[VALIDATE密码插件可以被用来测试密码 并提高安全性。你是否想设置VALIDATE密码插件？]
Press y|Y for Yes, any other key for No: y
There are three levels of password validation policy: [有三种级别的密码验证策略：]
LOW Length >= 8 MEDIUM Length >= 8, numeric, mixed case, and special characters STRONG Length >= 8, numeric, mixed case, special characters and dictionary file [最小长度> = 8 中等长度> = 8，数字，大小写混合和特殊字符 最长长度> = 8，数字，混合大小写，特殊字符和字典文件]
Please enter 0 = LOW, 1 = MEDIUM and 2 = STRONG: 0 [请输入0 =低，1 =中2 =强：0] Please set the password for root here. [请在这里设置root用户的密码。]
New password: [新密码：]
Re-enter new password: [重新输入新密码：]
Estimated strength of the password: 25 [密码的估计强度：25] Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y [您是否希望继续与提供的密码（按y | Y表示是，因为没有任何其他键）：Y？] … Failed! Error: Your password does not satisfy the current policy requirements [ … 失败！错误：您的密码不符合当前的要求]
New password:
Re-enter new password:
Estimated strength of the password: 50 [密码的估计强度：50] Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. [默认情况下，MySQL安装有一个匿名用户， 允许任何人登录到MySQL.]
Remove anonymous users? (Press y|Y for Yes, any other key for No) : y [删除匿名用户？] Success. [成功。]
Normally, root should only be allowed to connect from ‘localhost’. This ensures that someone cannot guess at the root password from the network. [通常情况下，Root 只允许其进行’localhost'(本地) 连接 。]
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : n [禁止远程root登录？]
… skipping. […跳过。] By default, MySQL comes with a database named ‘test’ that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. [默认情况下，MySQL带有一个名为“测试”数据库,任何人都可以访问。这也是仅用于测试，并且应该移动到生产之前被删除环境。]
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : n [删除测试数据库和访问权限？]
… skipping. [ …跳过。] Reloading the privilege tables will ensure that all changes made so far will take effect immediately. [刷新授权表以确保所有的变化取得将立即生效。]
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : [现在刷新授权表？]
… skipping. All done! [全部完成！]
开放 Root 远程连接权限
mysql -u root -p
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION; [password 为远程连接密码]
mysql>FLUSH PRIVILEGES; [刷新权限]
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