Add current version.

docker-compose.yml

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+version: '3'
+services:
+  squid:
+    image: ubuntu/squid:latest
+    environment:
+      - TZ=Asia/Seoul
+    volumes:
+      - ./squid.conf:/etc/squid/squid.conf
+      - squid-logs:/var/log/squid
+      - squid-data:/var/spool/squid
+    ports:
+      - 8888:8888
+    restart: unless-stopped
+
+volumes:
+  squid-data:
+  squid-logs:

squid.conf

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+# squid.conf
+# Cache Proxy for use with Fedora RPM/Yum Mirrors
+#
+
+http_port 8888 # This should match the port you're exposing via docker-compose.yml
+
+announce_host your.domain-or-host-name.tld
+visible_hostname your.domain-or-host-name.tld
+
+dns_nameservers 10.0.0.2 # Optional: Only if you want to set a specific DNS server
+
+cache_mem 400 MB
+maximum_object_size 200 MB
+maximum_object_size_in_memory 1024 KB
+
+access_log stdio:/var/log/squid/access.log squid
+
+# Configured to use a maximum of 15GB storage space
+cache_dir ufs /var/spool/squid 15000 16 256
+
+# Average object size, used to estimate number of objects your
+# cache can hold. The default is 13 KB.
+store_avg_object_size 817 KB
+
+# We want to keep the largest objects around longer, and just download the smaller objects if we can. 
+cache_replacement_policy heap LFUDA
+memory_replacement_policy heap GDSF
+
+# Cache repodata at least 30 minutes and then query parent whether it is fresh
+refresh_pattern \/repodata/.*$ 30 1% 1440 ignore-no-cache ignore-reload reload-into-ims
+
+# RPMs will hardly ever change, force to cache them for a long time.
+refresh_pattern  \.rpm$  10080 100% 525960 override-expire override-lastmod ignore-reload reload-into-ims
+
+# Everything else
+refresh_pattern 	.		0	100%	525960
+
+# Only allow requests from the local network
+acl localnet src 0.0.0.1-0.255.255.255
+acl localnet src 172.24.0.0/8 # Make sure you adjust these to whatever your local network IP ranges are
+acl localnet src 192.168.0.0/8
+
+# Only allow requests to the ports we specified.
+acl SSL_ports port 443
+acl Safe_ports port 80          # http
+acl Safe_ports port 443         # https
+acl Safe_ports port 8888        # Custom port you've exposed (see docker-compose.yml)
+
+# Allow SSL requests to pass through.
+acl CONNECT method CONNECT
+
+http_access deny !Safe_ports
+http_access deny CONNECT !SSL_ports
+http_access allow localhost manager
+http_access deny manager 
+http_access allow localhost
+http_access allow localnet
+http_access deny all
+icp_access allow all
+miss_access allow all
+
+# if transport is canceled, finish downloading anyway
+quick_abort_pct -1
+quick_abort_min -1 KB
+
+# when range is required, download the whole file anyway
+# when we request rpm header, we will nearly always get
+# request for the rest of the file
+range_offset_limit none
+
+# we download only from 1 server, default is 1024
+# which is too much for us
+fqdncache_size 4
+
+# Specify the user cache files should be owned by
+cache_effective_user proxy
+#cache_effective_group proxy