Magento接入Varnish

Varnish是一款高性能的开源HTTP加速器，可以有效降低web服务器的负载，提升访问速度。根据官方的说法，Varnish是一个cache型的HTTP反向代理。

基于M2.3.5和Varnish4.x

安装Varnish

wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm
yum update && yum install varnish

配置Varnish

vim /etc/varnish/varnish.params

VARNISH_LISTEN_PORT=6081
VARNISH_ADMIN_LISTEN_PORT=6082
DAEMON_OPTS="-a :6081
-T localhost:6082
-f /etc/varnish/default.vcl
-S /etc/varnish/secret
-p thread_pool_min=5
-p thread_pool_max=500 \
-p http_resp_hdr_len=65536
-p http_resp_size=98304
-p workspace_backend=98304 \
-s malloc,256m"

cp /etc/varnish/default.vcl /etc/varnish/default.vcl.bak

M2配置

Stores - Configuration - Advanced - System - Full Page Cache

然后将后台导出default.vcl上传到服务器，如果使用Nginx，还需要将/pub/health_check.php改为/health_check.php。

启动Varnish

systemctl start varnish

Nginx配置

map $request_uri $MAGE_RUN_CODE {
    default base;
}

map $request_uri $MAGE_RUN_TYPE {
    default website;
}

server {
    listen 80;
    server_name test.magento.com;

    location / { 
        proxy_pass http://127.0.0.1:6081; 
        proxy_set_header Host $http_host; 
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
    }
}

server {
    listen 443 ssl http2 default_server;
    listen [::]:443 ssl http2 default_server;
    server_name test.magento.com;

    #ssl on;
    ssl_certificate /usr/local/nginx/client_body_temp/2547820_test.magento.com.pem;
    ssl_certificate_key /usr/local/nginx/client_body_temp/2547820_test.magento.com.key;
    ssl_session_cache shared:SSL:1m;
    ssl_session_timeout 10m;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / { 
        proxy_pass http://127.0.0.1:6081; 
        proxy_set_header Host $http_host; 
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
        proxy_set_header X-Forwarded-Proto https; 
        proxy_set_header X-Forwarded-Port 443; 
    } 
}

server {
    listen 8080;
    server_name test.magento.com;           

    set $MAGE_ROOT /var/www/html/magento;
    include /var/www/html/magento/nginx.conf.sample;
}

用户通过http（80端口）或者https（443端口）访问时，使用Nginx的proxy_pass命令，反向代理到6081端口，由Varnish返回数据。

绑定varnish主机

bin/magento setup:config:set --http-cache-hosts=127.0.0.1:6081

这样，使用cache:clean就能同时把Varnish的缓存清理掉了。

正向代理和反向代理

题外话，无论正向代理还是反向代理，其实都是使用proxy_pass命令实现。正向还是反向，可以看代理的对象是客户端还是服务端。

• 正向：代理客户端，服务端无法知道实际请求的客户端
• 反向：代理服务端，客户端无法知道实际响应的服务端。如：CDN，负载均衡，varnish缓存

补充一张比较直观的图：