Add support for deploying a Squid caching proxy

Disabled by default.

Author: markgoddard

etc/kayobe/containers/squid_proxy/pre.yml

@@ -0,0 +1,14 @@
+---
+- name: Ensure /srv/docker/squid directory exists
+  file:
+    path: /srv/docker/squid
+    state: directory
+    mode: 0755
+  become: true
+
+- name: Copy modified squid.conf
+  copy:
+    src: "{{ kayobe_config_path }}/containers/squid_proxy/squid.conf"
+    dest: /srv/docker/squid/
+    mode: 0644
+  become: true

etc/kayobe/containers/squid_proxy/squid.conf

@@ -0,0 +1,75 @@
+#
+# 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 10.0.0.0/8	# RFC1918 possible internal network
+acl localnet src 172.16.0.0/12	# RFC1918 possible internal network
+acl localnet src 192.168.0.0/16	# RFC1918 possible internal network
+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 CONNECT method CONNECT
+
+#
+# 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
+#
+
+# 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 /var/spool/squid 4096 16 256
+cache_mem 768 MB
+maximum_object_size_in_memory 64 MB
+
+# 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 ^gopher:	1440	0%	1440
+refresh_pattern -i (/cgi-bin/|\?) 0	0%	0
+refresh_pattern .		0	20%	4320

etc/kayobe/seed.yml

@@ -105,6 +105,21 @@ seed_pulp_container:
       - pulp_containers:/var/lib/containers
     restart_policy: unless-stopped
 
+# Seed container running a Squid caching proxy. This can be used to proxy
+# HTTP(S) requests from control plane hosts.
+seed_squid_container_enabled: false
+
+seed_squid_container:
+  squid:
+    image: stackhpc/squid
+    pre: "{{ kayobe_config_path }}/containers/squid_proxy/pre.yml"
+    tag: "4.15"
+    network_mode: host
+    volumes:
+      - squid_spool:/var/spool/squid
+      - /srv/docker/squid/squid.conf:/etc/squid/squid.conf
+      - /var/log/squid:/var/log/squid
+
 # Dict of container images to start
 # Example:
 # seed_containers:
@@ -115,7 +130,8 @@ seed_pulp_container:
 #     post: "{{ kayobe_env_config_path }}/containers/squid/post.yml"
 #
 seed_containers: >-
-  {{ {} | combine(seed_pulp_container if seed_pulp_container_enabled | bool else {}) }}
+  {{ {} | combine(seed_pulp_container if seed_pulp_container_enabled | bool else {})
+        | combine(seed_squid_container if seed_squid_container_enabled | bool else {}) }}
 
 ###############################################################################
 # Seed node firewalld configuration.