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Amazon Linux 2023 へ Squid をインストールする

ARM 版の Amazon Linux 2023 へ Squid をインストールする手順をメモしておきます。

検証環境

以下の環境で検証しました。

  • Amazon Linux 2023
  • ARM
  • t4g.micro
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# cat /etc/system-release
Amazon Linux release 2023 (Amazon Linux)

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# uname -a
Linux ip-192-168-224-239.ap-northeast-1.compute.internal 6.1.66-91.160.amzn2023.aarch64 #1 SMP Wed Dec 13 04:49:48 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

標準リポジトリからインストール

標準リポジトリに Squid のパッケージがありました。 バージョンは 5.8 でした。

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# dnf info squid
Last metadata expiration check: 1 day, 14:40:27 ago on Mon Jan  1 23:19:32 2024.
Available Packages
Name         : squid
Epoch        : 7
Version      : 5.8
Release      : 1.amzn2023.0.3
Architecture : aarch64
Size         : 3.0 M
Source       : squid-5.8-1.amzn2023.0.3.src.rpm
Repository   : amazonlinux
Summary      : The Squid proxy caching server
URL          : http://www.squid-cache.org
License      : GPLv2+ and (LGPLv2+ and MIT and BSD and Public Domain)
Description  : Squid is a high-performance proxy caching server for Web clients,
             : supporting FTP, gopher, and HTTP data objects. Unlike traditional
             : caching software, Squid handles all requests in a single,
             : non-blocking, I/O-driven process. Squid keeps meta data and especially
             : hot objects cached in RAM, caches DNS lookups, supports non-blocking
             : DNS lookups, and implements negative caching of failed requests.
             :
             : Squid consists of a main server program squid, a Domain Name System
             : lookup program (dnsserver), a program for retrieving FTP data
             : (ftpget), and some management and client tools.

dnf でインストールします。

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dnf -y install squid

インストールされました。

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# systemctl status squid
○ squid.service - Squid caching proxy
     Loaded: loaded (/usr/lib/systemd/system/squid.service; disabled; preset: disabled)
     Active: inactive (dead)
       Docs: man:squid(8)

Squid の設定例

設定例は以下の通りです。 Listen するポートをデフォルトの TCP/3128 から TCP/8080 へ変更しています。

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cat << EOF > /etc/squid/squid.conf
http_port 8080

acl SSL_ports port 443
acl Safe_ports port 80
acl Safe_ports port 443

http_access deny !Safe_ports
http_access allow all

cache deny all

httpd_suppress_version_string on
visible_hostname unknown
forwarded_for off
coredump_dir /var/spool/squid

logformat datefmt %{%Y/%m/%d %H:%M:%S}tl.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
access_log daemon:/var/log/squid/access.log datefmt
EOF

設定が完了したら Squid を起動＆自動起動設定しておきます。

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systemctl start squid.service && systemctl enable squid.service

参考

デフォルトの /etc/squid/squid.conf

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#
# 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

#
# 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

# This default configuration only allows localhost requests because a more
# permissive Squid installation could introduce new attack vectors into the
# network by proxying external TCP connections to unprotected services.
http_access allow localhost

# The two deny rules below are unnecessary in this default configuration
# because they are followed by a "deny all" rule. However, they may become
# critically important when you start allowing external requests below them.

# Protect web applications running on the same server as Squid. They often
# assume that only local users can access them at "localhost" ports.
http_access deny to_localhost

# Protect cloud servers that provide local users with sensitive info about
# their server via certain well-known link-local (a.k.a. APIPA) addresses.
http_access deny to_linklocal

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# For example, to allow access from your local networks, you may uncomment the
# following rule (and/or add rules that match your definition of "local"):
# http_access allow localnet

# 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 /var/spool/squid 100 16 256

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

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