今天才申请了腾讯云+校园计划的1元服务器，（http://www.qcloud.com/event/qcloudSchool）安装了Centos7.0，在安装mysql的时候，使用yum list | grep mysql 来查找yum源中是否有mysql，结果如下：
<code class="hljs avrasm">[root@VM_47_56_centos ~]# yum list | grep mysql akonadi-mysql.x86_64 1.9.2-4.el7 base apr-util-mysql.x86_64 1.5.2-6.el7 base mysql-proxy.x86_64 0.8.5-2.el7 epel mysql-proxy-devel.x86_64 0.8.5-2.el7 epel mysql-router.x86_64 2.0.2-1.el7 mysql-tools-community mysql-router-debuginfo.x86_64 2.0.2-1.el7 mysql-tools-community mysql-utilities.noarch 1.5.6-1.el7 mysql-tools-community mysql-utilities-extra.noarch 1.5.6-1.el7 mysql-tools mysqlreport.noarch 3.5-11.el7 epel mysqltuner.noarch 1.2.0-7.el7 epel 省略部分内容。。。。 [root@VM_47_56_centos ~]# </code>
总之是看不到mysql-server的影子，（PS:据说Centos7.0的源中暂时还没有mysql，但是相同版本的Centos在阿里云是可以直接使用yum install mysql-server 来直接安装mysql的）
于是找了一些mysql的安装源，安装过程如下：
安装过程：为了解决这个问题，我们要先下载mysql的repo源。
1、下载mysql的repo源
<code class="hljs avrasm"><code class="hljs avrasm">$ wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm</code></code>
<code class="hljs avrasm">2、安装mysql-community-release-el7-5.noarch.rpm包
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso">$ sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm</code></code></code>
<code class="hljs avrasm"><code class="hljs lasso">安装这个包后，会获得两个mysql的yum repo源：<br />
/etc/yum.repos.d/mysql-community.repo和<br />
/etc/yum.repos.d/mysql-community-source.repo。
<code class="hljs avrasm"><code class="hljs lasso">3、安装mysql
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash">$ sudo yum install mysql-server</code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash">这个过程中就会看到有mysql的软件包存在：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc">[root@VM_47_56_centos ~]# sudo yum install mysql-server
已加载插件：fastestmirror, langpacks
| 2.5 kB 00:00:00
mysql-tools-community | 2.5 kB 00:00:00
mysql56-community | 2.5 kB 00:00:00
(1/3): mysql-connectors-community/x86_64/primary_db | 8.6 kB 00:00:00
(2/3): mysql-tools-community/x86_64/primary_db | 22 kB 00:00:00
(3/3): mysql56-community/x86_64/primary_db | 109 kB 00:00:01
Loading mirror speeds from cached hostfile
* base: mirrors.sina.cn
* extras: mirrors.sina.cn
* updates: mirrors.sina.cn
正在解决依赖关系
--> 正在检查事务
省略内容。。。
依赖关系解决
=================================================================================================================
Package 架构 版本 源 大小
=================================================================================================================
正在安装:
mysql-community-libs x86_64 5.6.27-2.el7 mysql56-community 2.0 M
替换 mariadb-libs.x86_64 1:5.5.44-1.el7_1
mysql-community-server x86_64 5.6.27-2.el7 mysql56-community 58 M
为依赖而安装:
mysql-community-client x86_64 5.6.27-2.el7 mysql56-community 19 M
mysql-community-common x86_64 5.6.27-2.el7 mysql56-community 256 k
numactl-libs x86_64 2.0.9-5.el7_1
事务概要
=================================================================================================================
安装 2 软件包 (+9 依赖软件包)
总下载量：80 M
Is this ok [y/d/N]: y</code></code></code></code></code><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc">下边的安装和其他安装一样，
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc">根据步骤安装就可以了，不过安装完成后，没有密码，需要重置密码。
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc">4、重置密码
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc">重置密码前，首先要登录
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby">$ mysql -u root</code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby">登录时有可能报这样的错：ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2)，原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash">$ sudo chown -R mysql:mysql /var/lib/mysql #这里的mysql是用户名（需要设置用户组合用户）</code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash">然后，重启服务：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby">$ service mysqld restart</code></code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby">接下来登录重置密码：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php">$ mysql -u root mysql > use mysql; mysql > update user set password=password('xu827928') where user='root'; mysql > exit;</code></code></code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php">5、开放3306端口(可以不用设置)
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash">$ sudo vim /etc/sysconfig/iptables</code></code></code></code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash">添加以下内容：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso">-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT</code></code></code></code></code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso">保存后重启防火墙：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso"><code class="hljs bash">$ sudo service iptables restart</code></code></code></code></code></code></code></code></code></code></code></code>
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso"><code class="hljs bash">这样从其它客户机也可以连接上mysql服务了。
<code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso"><code class="hljs bash">6、修改权限可以使其他机器登录：
<code class="hljs avrasm"><code class="hljs avrasm"><code class="hljs lasso"><code class="hljs bash"><code class="hljs asciidoc"><code class="hljs ruby"><code class="hljs bash"><code class="hljs ruby"><code class="hljs php"><code class="hljs bash"><code class="hljs lasso"><code class="hljs bash"><code class="hljs lasso">?mysql>mysql -h localhost -u root //这样应该可以进入MySQL服务器 mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION //赋予任何主机访问数据的权限 mysql>FLUSH PRIVILEGES //修改生效 mysql>EXIT //退出MySQL服务器</code></code></code></code></code></code></code></code></code></code></code></code></code>
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