代理访问是什么意思（国外代理服务器ip推荐）

背景：

最近货运仓库访问服务器有超时的情况。

需求：

需要抓到客户端访问请求的具体id和其耗时。

解决：

1、使用仓库服务器中的一台虚机作为代理，让操作客户端通过代理访问服务端，通过日志记录具体的请求信息和响应耗时。

在代理服务器上安装squid

yum -y install squid
cat >> /etc/squid/squid.conf << EOF
logformat combined   %tl %6tr %>a "%rm %ru %rp HTTP/%rv" %>Hs %<st  %Ss:%Sh/%<a
access_log /var/log/squid/access.log combined
EOF
systemctl enable squid --now

具体的logformat释义如下：

ts Seconds since epoch

tu subsecond time (milliseconds)

tr Response time (milliseconds)

>a Client source IP address

ui User name from ident

un A user name. Expands to the first available name

from the following list of information sources:

– authenticated user name, like %ul

– user name supplied by an external ACL, like %ue

– SSL client name, like %us

– ident user name, like %ui

tl Local time. Optional strftime format argument

default %d/%b/%Y:%H:%M:%S %z

[http::]rm Request method (GET/POST etc)

[http::]ru Request URL from client (historic, filtered for logging)

rp Request URL path excluding hostname

[http::]rv Request protocol version

[http::]>Hs HTTP status code sent to the client

[http::]<st Total size of reply sent to client (after adaptation)

[http::]>h Original received request header.

Usually differs from the request header sent by

Squid, although most fields are often preserved.

Accepts optional header field name/value filter

argument using name[:[separator]element] format.

Ss Squid request status (TCP_MISS etc)

Sh Squid hierarchy status (DEFAULT_PARENT etc)

在客户端pc上设置代理服务器：

l 直接搜索“代理” ，点击“代理服务器设置”。

l 打开使用代理；输入代理服务器设置10.168.79.227 3128，并保存。关闭代理则将开关置为关即可。

l 打开客户端能进行正常操作即配置成功。

在服务器上/var/log/squid/access.log的输出日志如下，

通过filebeat采集到内网elk。

能通过各种维度分析请求的数据，比如分析url请求耗时的统计排序，请求耗时分布等，非常有助于分析系统问题！