Redis结合lnmp架构做mysql的缓存服务器
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2022-04-15 20:14:36
Redis——结合lnmp架构做mysql的缓存服务器1. 在server1中配置nginx2. 在server1中配置php3. 在server2中配置redis4. 在server3中配置数据库5. 测试6. 存在的问题1. 在server1中配置nginxstep1 关闭之前做的redis(如果没有做过可忽略):yum install psmisc-22.20-11.el7.x86_6......
Redis——结合lnmp架构做mysql的缓存服务器
1. 在server1中配置nginx
step1 关闭之前做的redis(如果没有做过可忽略):
yum install psmisc-22.20-11.el7.x86_64 -y
killall redis-server
step2 编译安装nginx:
tar zxf nginx-1.16.1.tar.gz
cd nginx-1.16.1
yum install gcc pcre-devel zlib-devel -y
./configure --prefix=/usr/local/nginx
make && make install
step3 配置并启动nginx:
cd /usr/local/nginx/
ln -s /usr/local/nginx/sbin/nginx /usr/local/sbin/ #制作软连接
cd conf/
vim nginx.conf
修改以下内容:
2 user nginx nginx;
43 location / {
44 root html;
45 index index.php index.html index.htm;
46 }
65 location ~ \.php$ {
66 root html;
67 fastcgi_pass 127.0.0.1:9000;
68 fastcgi_index index.php;
69 # fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
70 include fastcgi.conf;
71 }
useradd -u 900 nginx
nginx #启动
netstat -antlp
2. 在server1中配置php
安装后启动:
systemctl start php-fpm
netstat -antlp
3. 在server2中配置redis
注意:因为在之前的博客中server2做过redis的主从复制,所以此处还原实验环境
/etc/init.d/redis_6379 stop
vim /etc/redis/6379.conf #删除最后一行(1379 slaveof 172.25.254.1 6379)
/etc/init.d/redis_6379 start
测试redis:可以正常使用
redis-cli
127.0.0.1:6379> get name
"nigar"
127.0.0.1:6379> DEL name
(integer) 1
127.0.0.1:6379> get name
(nil)
4. 在server3中配置数据库
rpm -qa | grep mysql #查看之前是否安装过mysql,如果安装过要卸载
yum install -y mariadb-server #实验不需要用mysql,安装mariadb即可
systemctl start mariadb
mysql_secure_installation #安全初始化
授权用户:
mysql -uroot -p123 #登陆数据库
MariaDB [(none)]> create database test;
Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]> grant all on test.* to redis@'%' identified by '123';
Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.00 sec)
配置测试页面:
在server1中:
cd /usr/local/nginx/html/
vim index.php
<?php
$redis = new Redis();
$redis->connect('172.25.254.2',6379) or die ("could net connect redis server"); #此处ip为安装redis的虚拟机ip(server2)
# $query = "select * from test limit 9";
$query = "select * from test";
for ($key = 1; $key < 10; $key++)
{
if (!$redis->get($key))
{
$connect = mysql_connect('172.25.254.3','redis','123'); #此处ip为安装mariadb的虚拟机ip(server3);密码为数据库授权的用户密码
mysql_select_db(test);
$result = mysql_query($query);
//如果没有找到$key,就将该查询sql的结果缓存到redis
while ($row = mysql_fetch_assoc($result))
{
$redis->set($row['id'],$row['name']);
}
$myserver = 'mysql';
break;
}
else
{
$myserver = "redis";
$data[$key] = $redis->get($key);
}
}
echo $myserver;
echo "<br>";
for ($key = 1; $key < 10; $key++)
{
echo "number is <b><font color=#FF0000>$key</font></b>";
echo "<br>";
echo "name is <b><font color=#FF0000>$data[$key]</font></b>";
echo "<br>";
}
?>
为server3上的mysql的test库加入一些数据:
vim test.sql
use test;
CREATE TABLE `test` (`id` int(7) NOT NULL AUTO_INCREMENT, `name` char(8) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `test` VALUES (1,'test1'),(2,'test2'),(3,'test3'),(4,'test4'),(5,'test5'),(6,'test6'),(7,'test7'),(8,'test8'),(9,'test9');
mysql -p123 < test.sql #导入数据
5. 测试
浏览器访问172.25.254.1
进入时查看到数据是从mysql取到的;刷新后数据从redis中取,再刷新也是redis
6. 存在的问题
如果此时 mysql 数据发生变更,redis会同步吗?
测试:
修改数据库的数据信息:
MariaDB [(none)]> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [test]> update test set name='haha' where id=1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
MariaDB [test]> select * from test;
在刚才的测试页面查看,并没有更新数据信息:
redis-cli
127.0.0.1:6379> get 1 #并没有修改为haha
"test1"
127.0.0.1:6379> set 1 haha #手动修改为haha
OK
127.0.0.1:6379> get 1
"haha"
此时在刚才的测试页面中查看,数据才更新了。
这是一个很大的弊端,我们必须时刻查看数据库的数据是否有更新,再手动在redis上更新,这显然不符合企业要求。那么这个问题该如何解决呢?需要用到gearmand,具体用法在下一篇博文中介绍
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