How to install Mysql under Linux system

Background

　I started learning to deploy ambari not long ago. I encountered some problems when installing mysql. Now I found some deployment processes on the Internet and recorded them for convenience. Install mysql later.

Centos 7.2 Install Mysql 5.7.13

First install yum, as follows:

tar xvf yum-x.x.x.tar .gz

cd yum-x.x.x
yummain.py install yum

The above is the general process in memory.

1. Download the repo source of mysql

The yum source of CentOS 7.2 does not have mysql by default. You must first download the repo source of mysql

2. Install the mysql57-community-release-el7-8.noarch.rpm package

• rpm <span class="hljs-attribute">-ivh mysql57<span class="hljs-attribute">-community<span class="hljs-attribute">-release<span class="hljs-attribute">-el7<span class="hljs-subst">-<span class="hljs-number">8.noarch<span class="hljs-built_in">.rpm <span class="hljs-subst">--nodeps <span class="hljs-subst">--<a href="http://www.php.cn/wiki/125.html" target="_blank">for</a>ce</span></span></span></span></span></span></span></span></span>

After installing this package, you will get two mysql yum repo sources:/ etc/yum.repos.d/mysql-community.repo and /etc/yum.repos.d/mysql-community-source.repo

3. Install mysql

yum install mysql-server

4. Start the mysql service

Check whether the MySQL service has been started

service mysqld status

##If it is not started, you can Use the following command to start the service

<code class="hljs sql has-numbering">service mysqld start<br/>or<br/>systemctl <span class="hljs-operator"><span class="hljs-keyword">start mysqld</span></span></code>

5. Reset the root password

MySQL5.7 will generate a password for the root user after installation A random password instead of an empty password like in previous versions.

You can change the root login password in safe mode or log in with a random password to change the password. The random password method is used below

The random password generated by MySQL for the root user can be found through the mysqld.log file:

• grep <span class="hljs-keyword"> 'temporary password' /var/<span class="hljs-string">log/mysqld.<span class="hljs-keyword">log<span class="hljs-keyword"></span></span></span></span>

Change the root user password: (MySQL's password policy is relatively complex, and passwords that are too simple will be rejected)

• mysql -u root <span class="hljs-attribute">-p mysql<span class="hljs-attribute">> Enter password: (Enter the random password you just queried) mysql<span class="hljs-subst">> <span class="hljs-subst">SET PASSWORD FOR <span class="hljs-built_in">'root'@<span class="hljs-string">'localhost'<span class="hljs-string">= <span class="hljs-subst">"Root-123"; mysql<span class="hljs-string">> exit<span class="hljs-subst"></span></span></span></span></span></span></span></span></span></span>

#Log in with root’s new password:

• mysql

  -u root -pRoot<span class="hljs-attribute">-<span class="hljs-attribute">123<span class="hljs-subst"><span class="hljs-number"></span></span></span></span>

If the above method cannot be modified, you can use the following safe mode to modify root:

关闭服务
systemctl stop mysqld.service
vi /etc/my.cnf 
mysqld下面添加skip-grant-tables 保存退出启动服务
systemctl start mysqld.service
mysql -u root 不用密码直接回车
use mysql
update user set authentication_string=password('Root-123') where User='root' and Host='localhost';
flush privileges;
exit;
vi /etc/my.cnf 把 skip-grant-tables 一句删除保存退出重启mysql服务 
systemctl restart mysqld.service
再次登录即可
mysql -u root -pRoot-123如果进行操作出现下面的提示:
You must reset your password using ALTER USER statement before executing this statement.
就再设置一遍密码
set password = password('Root-123');

6. Open port 3306

Allow the user name root password Root-123456 to connect to the mysql server from any host

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'Root-123456' WITH GRANT OPTION;
mysql>FLUSH PRIVILEGES;
mysql>exit;

• ##Open the firewall mysql 3306 port external Visit

  firewall-cmd --zone=public --add-port=3306/tcp --permanent

  firewall-cmd --reload

<span class="hljs-comment"><span class="hljs-literal"><span class="hljs-comment"><span class="hljs-literal"><span class="hljs-literal"><span class="hljs-comment"><span class="hljs-literal"><span class="hljs-literal"><span class="hljs-comment"><span class="hljs-literal"><span class="hljs-comment"><span class="hljs-literal"> <span class="hljs-literal"><span class="hljs-comment"><span class="hljs-comment"><span class="hljs-literal"><span class="hljs-comment"><span class="hljs-literal"><span class="hljs-literal">#Summarize<span class="hljs-comment"></span></span></span></span></span></span></span></span> </span></span></span></span></span></span></span></span></span></span></span></span>

## Mysql is configured in more detail above. You can use systemctl restart mysqld.service. After starting, use the command (ps -ef|grep mysql) to view the status of mysql to display the current configuration and status. I just started learning this, and there are still many things I don’t understand. I hope you can give me some advice. #

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