squid配置（内存缓存开启/关闭）

发布于：2025-06-07 ⋅ 阅读:(19) ⋅ 点赞:(0)

实验环境：

1、主机1：192.168.182.131， 客户端，去访问squid机器。

2、主机2:  192.168.182.129, squid服务器。

3、主机3:192.168.182.130， nginx机器，提供静态资源（这里在实际生成运行中也可以是接口服务），端口为8080。

主机2：编译安装squid-5.0.5.tar.gz。下载地址github：squid下载地址

#编译squid的前需提前安装g++、gcc-c++

yum install g++
yum install yum install g++


useradd squid
su - squid
#上传安装包squid-5.0.5.tar.gz到/home/squid目录下。
tar -xzvf squid-5.0.5.tar.gz
cd squid-5.0.5/
./configure --prefix=/home/squid/squid
 make
make install

实验1：禁用内存缓存和磁盘缓存         

        安装完成squid后，默认squid配置文件在 /home/squid/squid/etc/squid.conf，默认配置是不开启磁盘缓存，但是会默认开启内存缓存。（如果禁用了内存缓存，则无论是否开启磁盘缓存，都是无缓存效果）

1、squid配置要访问的nginx的ip 192.168.182.130和端口8080。

#开启http协议访问8080
acl Safe_ports port 8080

#开启https协议访问8080
acl SSL_ports port 8080

2、定义访问规则 

#定义一个名为 my_site 的访问控制列表（ACL），用于匹配目标域名或 IP，这里的my_site可以任意改#名字
acl my_site dstdomain 192.168.182.130


#允许访问符合 my_site 规则的目标地址
http_access allow my_site
#禁止访问所有不符合 my_site 规则的目标地址
http_access deny !my_site

2、禁用内存缓存（根据系统的实际需求，如果对实时要求很高，不允许使用缓存，则关闭磁盘和内存缓存。此例则关闭缓存，所有的请求均转发到目的地址）

#默认默认的配置已禁用磁盘缓存，即#cache_dir ufs /home/squid/squid/var/cache/squid 100 16 256

#下面的表示禁用内存缓存
cache_mem 0 MB  # 禁用内存缓存
minimum_object_size 0 KB  # 不缓存任何对象（可选优化）
maximum_object_size 0 KB  # 同上

完整的squid配置文件如下： 

#
# Recommended minimum configuration:
#

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 0.0.0.1-0.255.255.255  # RFC 1122 "this" network (LAN)
acl localnet src 10.0.0.0/8             # RFC 1918 local private network (LAN)
acl localnet src 100.64.0.0/10          # RFC 6598 shared address space (CGN)
acl localnet src 169.254.0.0/16         # RFC 3927 link-local (directly plugged) machines
acl localnet src 172.16.0.0/12          # RFC 1918 local private network (LAN)
acl localnet src 192.168.0.0/16         # RFC 1918 local private network (LAN)
acl localnet src fc00::/7               # RFC 4193 local private network range
acl localnet src fe80::/10              # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 8080
acl SSL_ports port 8080

#
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
acl my_site dstdomain 192.168.182.130
#


http_access allow my_site
http_access deny !my_site
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /home/squid/squid/var/cache/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /home/squid/squid/var/cache/squid

cache_mem 0 MB  # 禁用内存缓存
minimum_object_size 0 KB  # 不缓存任何对象（可选优化）
maximum_object_size 0 KB  # 同上
#
# Add any of your own refresh_pattern entries above these.
#
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

#启动squid 
/home/squid/squid/sbin/squid

主机1通过squid去访问nginx，多次访问都是正常访问。

 curl -x 192.168.182.129:3128 http://192.168.182.130:8080

主机1 的访问结果如下：

squid日志如下：

可以看到squid的日志一直提示 TCP_MISS/200 501 GET http://192.168.182.130:8080/ - HIER_DIRECT/192.168.182.130 text/html，，表示不使用squid的缓存，直接转发nginx机器去访问。

停掉nginx进程后再次访问squid，发现返回错误。验证squid无缓存。

nginx进程停止：

主机1访问squid报错。

squid日志：返回503

实验2：启用内存缓存但禁用磁盘缓存

调整squid配置文件 ，删除如下内存缓存禁用参数，即默认开启内存缓存。

cache_mem 0 MB  # 禁用内存缓存
minimum_object_size 0 KB  # 不缓存任何对象（可选优化）
maximum_object_size 0 KB  # 同上

 删除内存缓存禁用参数后，完整squid的配置文件如下：

#
# Recommended minimum configuration:
#

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 0.0.0.1-0.255.255.255  # RFC 1122 "this" network (LAN)
acl localnet src 10.0.0.0/8             # RFC 1918 local private network (LAN)
acl localnet src 100.64.0.0/10          # RFC 6598 shared address space (CGN)
acl localnet src 169.254.0.0/16         # RFC 3927 link-local (directly plugged) machines
acl localnet src 172.16.0.0/12          # RFC 1918 local private network (LAN)
acl localnet src 192.168.0.0/16         # RFC 1918 local private network (LAN)
acl localnet src fc00::/7               # RFC 4193 local private network range
acl localnet src fe80::/10              # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 8080
acl SSL_ports port 8080

#
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
acl my_site dstdomain 192.168.182.130
#


http_access allow my_site
http_access deny !my_site
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /home/squid/squid/var/cache/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /home/squid/squid/var/cache/squid

#
# Add any of your own refresh_pattern entries above these.
#
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

 重新加载squid配置文件并启动nginx进程。

#解析squid的配置是否语法正确
/home/squid/squid/sbin/squid -k parse

#加载squid的配置文件
/home/squid/squid/sbin/squid -k reconfigure


#启动nginx
 /home/nginx/nginx/sbin/nginx

主机1 多次访问squid，均正常返回结果。

主机1 :

squid机器：日志显示TCP_MEM_HIT/200,则表示命中内存缓存，直接返回结果，不再去转发请求到nginx机器。

把nginx进程停掉，发现主机1仍然能访问squid并获取结果。证实squid开启了内存缓存。

实验3：开启和禁止传递客户端真实ip地址

        有时客户端的ip地址属于隐私信息，不能让服务器获取客户端的ip地址，只允许服务器获取squid的地址。squid配置文件默认开启 X-Forwarded-For 字段，请求报文头中会传递此字段给后端服务器，后端服务器可以通过此字段来查看客户端的真实ip。

一、开启传递客户端真实ip地址：squid默认开启传递客户端真实ip，也可以手动显式地在squid配置文件中设置forwarded_for on。在nginx中定义日志格式，通过$http_x_forwarded_for变量来获取请求头中的X-Forwarded-For 字段值。（这里的$http_x_forwarded_for均为小写，对应请求头中的X-Forwarded-For ，下划线对应短横杠）nginx 配置文件如下：

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;


    #定义日志格式，其中变量$http_x_forwarded_for用于保存请求头中的X-Forwarded-For字段值，也就##也是客户端的真实ip
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       8080;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

#重新加载nginx配置文件
/home/nginx/nginx/sbin/nginx  -s reload

主机1通过squid访问nginx，然后查看nginx日志，发现了真实的客户端ip，即主机1的ip地址。结果如下：

       主机1结果：

        nginx日志：通过查看nginx日志发现了主机1的客户端ip，证实forwarded_for on为默认配置。

二、禁止客户端ip传递

设置

forwarded_for off

squid 配置文件如下：

#
# Recommended minimum configuration:
#

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 0.0.0.1-0.255.255.255  # RFC 1122 "this" network (LAN)
acl localnet src 10.0.0.0/8             # RFC 1918 local private network (LAN)
acl localnet src 100.64.0.0/10          # RFC 6598 shared address space (CGN)
acl localnet src 169.254.0.0/16         # RFC 3927 link-local (directly plugged) machines
acl localnet src 172.16.0.0/12          # RFC 1918 local private network (LAN)
acl localnet src 192.168.0.0/16         # RFC 1918 local private network (LAN)
acl localnet src fc00::/7               # RFC 4193 local private network range
acl localnet src fe80::/10              # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 8080
acl SSL_ports port 8080


#禁止传递客户端ip地址
forwarded_for off
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
acl my_site dstdomain 192.168.182.130
#


http_access allow my_site
http_access deny !my_site
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# Uncomment and adjust the following to add a disk cache directory.
cache_dir ufs /home/squid/squid/var/cache/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /home/squid/squid/var/cache/squid

#

cache_mem 0 MB  # 禁用内存缓存
minimum_object_size 0 KB  # 不缓存任何对象（可选优化）
maximum_object_size 0 KB  # 同
# Add any of your own refresh_pattern entries above these.
#
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320

重新加载squid

/home/squid/squid/sbin/squid -k parse

 /home/squid/squid/sbin/squid -k reconfigure

主机1再次通过squid访问nginx，然后查看nginx日志，发现nginx日志中未记录主机1的ip，说明squid未传递客户端的ip地址，forwarded_for off参数生效。

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