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Add squid role (#401)
* add squid role + config * make systemd proxy config idempotent (and clearer) * fix defaults for squid/builder * bump CI image * fix squid cache dir definition error * Fix squid README nits Co-authored-by: Scott Davidson <[email protected]> * Fix squid README nits Co-authored-by: Scott Davidson <[email protected]> * Fix squid README nits Co-authored-by: Scott Davidson <[email protected]> * Fix squid README nits Co-authored-by: Scott Davidson <[email protected]> * make proxy default to squid port --------- Co-authored-by: Scott Davidson <[email protected]>
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‎ansible/.gitignore‎

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@@ -53,4 +53,6 @@ roles/*
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!roles/persist_hostkeys/
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!roles/persist_hostkeys/**
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!roles/ofed/
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!roles/ofed/**
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!roles/ofed/**
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!roles/squid/
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!roles/squid/**

‎ansible/bootstrap.yml‎

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path: /etc/profile
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search_string: HOSTNAME=$(/usr/bin/hostnamectl --transient 2>/dev/null) || \
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state: absent
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- name: Remove RHEL cockpit
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dnf:
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name: cockpit-ws
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state: "{{ appliances_cockpit_state }}"
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- name: Add system user groups
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ansible.builtin.group: "{{ item.group }}"
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loop: "{{ appliances_local_users }}"
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policy: "{{ selinux_policy }}"
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register: sestatus
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# --- tasks after here require access to package repos ---
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- hosts: squid
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tags: squid
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gather_facts: yes
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become: yes
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tasks:
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- name: Configure squid proxy
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import_role:
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name: squid
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- hosts: freeipa_server
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# Done here as it might be providing DNS
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tags:
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name: freeipa
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tasks_from: server.yml
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# --- tasks after here require access to package repos ---
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- hosts: cluster
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gather_facts: false
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become: yes
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tags: cockpit
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tasks:
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- name: Remove RHEL cockpit
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dnf:
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name: cockpit-ws
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state: "{{ appliances_cockpit_state }}"
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- hosts: firewalld
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gather_facts: false

‎ansible/roles/proxy/tasks/main.yml‎

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path: /etc/systemd/system.conf.d/90-proxy.conf
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section: Manager
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option: DefaultEnvironment
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value: >
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"http_proxy={{ proxy_http_proxy }}" "https_proxy={{ proxy_http_proxy }}" "no_proxy={{ proxy_no_proxy }}"
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value: >-
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"http_proxy={{ proxy_http_proxy }}"
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"https_proxy={{ proxy_http_proxy }}"
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"no_proxy={{ proxy_no_proxy }}"
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no_extra_spaces: true
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owner: root
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group: root

‎ansible/roles/squid/README.md‎

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# squid
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Deploy a caching proxy.
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**NB:** The default configuration is aimed at providing a proxy for package installs etc. for
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nodes which do not have direct internet connectivity. It assumes access to the proxy is protected
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by the OpenStack security groups applied to the cluster. The generated configuration should be
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reviewed if this is not case.
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## Role Variables
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Where noted these map to squid parameters of the same name without the `squid_` prefix - see [squid documentation](https://www.squid-cache.org/Doc/config) for details.
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- `squid_conf_template`: Optional str. Path (using Ansible search paths) to squid.conf template. Default is in-role template.
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- `squid_started`: Optional bool. Whether to start squid service. Default `true`.
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- `squid_enabled`: Optional bool. Whether squid service is enabled on boot. Default `true`.
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- `squid_cache_mem`: Required str. Size of memory cache, e.g "1024 KB", "12 GB" etc. See squid parameter.
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- `squid_cache_dir`: Optional. Path to cache directory. Default `/var/spool/squid`.
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- `squid_cache_disk`: Required int. Size of disk cache in MB. See Mbytes under "ufs" store type for squid parameter [cache_dir](https://www.squid-cache.org/Doc/config/cache_dir/).
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- `squid_maximum_object_size_in_memory`: Optional str. Upper size limit for objects in memory cache, default '64 MB'. See squid parameter.
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- `squid_maximum_object_size`: Optional str. Upper size limit for objects in disk cache, default '200 MB'. See squid parameter.
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- `squid_http_port`: Optional str. Socket addresses to listen for client requests, default '3128'. See squid parameter.
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- `squid_acls`: Optional str, can be multiline. Define access lists. Default `acl anywhere src all`, i.e. rely on OpenStack security groups (or other firewall if deployed). See squid parameter `acl`. NB: The default template also defines acls for `SSL_ports` and `Safe_ports` as is common practice.
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- `squid_http_access`: Optional str, can be multiline. Allow/deny access based on access lists. Default:
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# Deny requests to certain unsafe ports
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http_access deny !Safe_ports
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# Deny CONNECT to other than secure SSL ports
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http_access deny CONNECT !SSL_ports
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# Only allow cachemgr access from localhost
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http_access allow localhost manager
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http_access deny manager
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# Rules allowing http access
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http_access allow anywhere
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http_access allow localhost
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# Finally deny all other access to this proxy
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http_access deny all
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See squid parameter.

‎ansible/roles/squid/defaults/main.yml‎

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squid_conf_template: squid.conf.j2
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squid_started: true
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squid_enabled: true
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squid_cache_mem: "{{ undef(hint='squid_cache_mem required, e.g. \"12 GB\"') }}"
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squid_cache_dir: /var/spool/squid
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squid_cache_disk: "{{ undef(hint='squid_cache_disk (in MB) required, e.g. \"1024\"') }}" # always in MB
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squid_maximum_object_size_in_memory: '64 MB'
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squid_maximum_object_size: '200 MB'
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squid_http_port: 3128
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squid_acls: acl anywhere src all # rely on openstack security groups
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squid_http_access: |
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# Deny requests to certain unsafe ports
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http_access deny !Safe_ports
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# Deny CONNECT to other than secure SSL ports
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http_access deny CONNECT !SSL_ports
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# Only allow cachemgr access from localhost
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http_access allow localhost manager
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http_access deny manager
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# Rules allowing http access
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http_access allow anywhere
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http_access allow localhost
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# Finally deny all other access to this proxy
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http_access deny all

‎ansible/roles/squid/handlers/main.yml‎

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- name: Restart squid
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service:
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name: squid
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state: restarted
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when: squid_started | bool

‎ansible/roles/squid/tasks/configure.yml‎

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- name: Ensure squid cache directory exists
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file:
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path: "{{ squid_cache_dir }}"
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# based on what dnf package creates:
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owner: squid
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group: squid
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mode: u=rwx,g=rw,o=
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- name: Template squid configuration
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template:
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src: "{{ squid_conf_template }}"
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dest: /etc/squid/squid.conf
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owner: squid
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group: squid
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mode: ug=rwX,go=
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notify: Restart squid
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- meta: flush_handlers
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- name: Ensure squid service state
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systemd:
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name: squid
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state: "{{ 'started' if squid_started | bool else 'stopped' }}"
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enabled: "{{ true if squid_enabled else false }}"

‎ansible/roles/squid/tasks/install.yml‎

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- name: Install squid package
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dnf:
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name: squid

‎ansible/roles/squid/tasks/main.yml‎

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- import_tasks: install.yml
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- import_tasks: configure.yml

‎ansible/roles/squid/templates/squid.conf.j2‎

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#
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# Based on combination of configs from
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# - https://github.com/stackhpc/docker-squid/blob/master/squid.conf
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# - https://github.com/drosskopp/squid-cache/blob/main/squid.conf
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#
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# Define ACLs:
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{{ squid_acls }}
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acl SSL_ports port 443
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acl Safe_ports port 80 # http
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acl Safe_ports port 21 # ftp
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acl Safe_ports port 443 # https
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acl Safe_ports port 70 # gopher
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acl Safe_ports port 210 # wais
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acl Safe_ports port 1025-65535 # unregistered ports
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acl Safe_ports port 280 # http-mgmt
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acl Safe_ports port 488 # gss-http
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acl Safe_ports port 591 # filemaker
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acl Safe_ports port 777 # multiling http
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acl CONNECT method CONNECT
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# Rules allowing http access
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{{ squid_http_access}}
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# Squid normally listens to port 3128
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http_port {{ squid_http_port }}
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# Define cache parameters:
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cache_dir ufs /var/spool/squid {{ squid_cache_disk | int }} 16 256
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cache_mem {{ squid_cache_mem }}
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maximum_object_size_in_memory {{ squid_maximum_object_size_in_memory }}
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maximum_object_size {{ squid_maximum_object_size }}
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# Keep largest objects around longer:
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cache_replacement_policy heap LFUDA
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memory_replacement_policy heap GDSF
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# Leave coredumps in the first cache dir
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coredump_dir /var/spool/squid
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# Configure refresh
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# cache repodata only few minutes and then query parent whether it is fresh:
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refresh_pattern /XMLRPC/GET-REQ/.*/repodata/.*$ 0 1% 1440 ignore-no-cache reload-into-ims refresh-ims
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# rpm will hardly ever change, force it to cache for very long time:
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refresh_pattern \.rpm$ 10080 100% 525960 override-expire override-lastmod ignore-reload reload-into-ims
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refresh_pattern ^ftp: 1440 20% 10080
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refresh_pattern ^gopher: 1440 0% 1440
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refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
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refresh_pattern . 0 20% 4320
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# Disable squid doing logfile rotation as the RockyLinux dnf package configures logrotate
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logfile_rotate 0

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