Puppet Class: profile::cache::varnish::frontend
- Defined in:
- modules/profile/manifests/cache/varnish/frontend.pp
Summary
profile to configure frontend varnish cacheOverview
SPDX-License-Identifier: Apache-2.0
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# File 'modules/profile/manifests/cache/varnish/frontend.pp', line 30
class profile::cache::varnish::frontend (
# Globals
String $conftool_prefix = lookup('conftool_prefix'),
Boolean $has_lvs = lookup('has_lvs', {'default_value' => true}),
# TODO: fix theses so they re under the profile namespace
Hash[String, Hash] $cache_nodes = lookup('cache::nodes'),
String $cache_cluster = lookup('cache::cluster'),
Profile::Cache::Sites $req_handling = lookup('cache::req_handling'),
Profile::Cache::Sites $alternate_domains = lookup('cache::alternate_domains', {'default_value' => {}}),
Boolean $single_backend = lookup('profile::cache::varnish::frontend::single_backend', {'default_value' => false}),
# locals
Hash[String, Any] $fe_vcl_config = lookup('profile::cache::varnish::frontend::fe_vcl_config'),
Hash[String, Any] $fe_cache_be_opts = lookup('profile::cache::varnish::frontend::cache_be_opts'),
Boolean $backends_in_etcd = lookup('profile::cache::varnish::frontend::backends_in_etcd'),
Array[String] $fe_extra_vcl = lookup('profile::cache::varnish::frontend::fe_extra_vcl'),
Array[String] $runtime_params = lookup('profile::cache::varnish::frontend::runtime_params'),
String $packages_component = lookup('profile::cache::varnish::frontend::packages_component'),
Array[String] $separate_vcl = lookup('profile::cache::varnish::frontend::separate_vcl'),
Integer $fe_transient_gb = lookup('profile::cache::varnish::frontend::transient_gb'),
Array[Stdlib::Unixpath] $listen_uds = lookup('profile::cache::varnish::frontend::listen_uds'),
String $uds_owner = lookup('profile::cache::varnish::frontend::uds_owner'),
String $uds_group = lookup('profile::cache::varnish::frontend::uds_group'),
Stdlib::Filemode $uds_mode = lookup('profile::cache::varnish::frontend::uds_mode'),
Stdlib::Unixpath $privileged_uds = lookup('profile::cache::varnish::frontend::privileged_uds', {'default_value' => '/run/varnish-privileged.socket'}),
Boolean $use_etcd_req_filters = lookup('profile::cache::varnish::frontend::use_etcd_req_filters'),
Boolean $use_ip_reputation = lookup('profile::cache::varnish::frontend::use_ip_reputation'),
Boolean $do_esitest = lookup('profile::cache::varnish::frontend::do_esitest', {'default_value' => false}),
Boolean $enable_monitoring = lookup('profile::cache::varnish::frontend::enable_monitoring'),
Optional[String] $fe_jemalloc_conf = lookup('profile::cache::varnish::frontend::fe_jemalloc_conf', {'default_value' => undef}),
Integer[1] $thread_pool_max = lookup('profile::cache::varnish::frontend::thread_pool_max'),
Optional[String] $vsl_size = lookup('profile::cache::varnish::frontend::vsl_size', {'default_value' => '160M'}),
Optional[Integer] $fe_mem_gb_reserved = lookup('profile::cache::varnish::frontend::fe_mem_gb_reserved', {'default_value' => 170}),
Optional[String] $fe_beacon_uri_regex = lookup('profile::cache::varnish::frontend::fe_beacon_uri_regex', {'default_value' => '^/beacon\/[^/?]+'})
) {
include profile::cache::base
$wikimedia_nets = $profile::cache::base::wikimedia_nets
$wikimedia_trust = $profile::cache::base::wikimedia_trust
$wikimedia_domains = $profile::cache::base::wikimedia_domains
$wmcs_domains = $profile::cache::base::wmcs_domains
if $has_lvs {
include profile::lvs::realserver
}
$packages = [
'varnish',
'varnish-modules',
'libvmod-netmapper',
'libvmod-re2',
'libvmod-querysort', # T138093
]
# We need these two services disabled as we don't use them.
systemd::mask { 'varnishncsa.service': }
systemd::mask { 'varnishlog.service': }
if $packages_component == 'main' {
package { $packages:
ensure => installed,
before => Mount['/var/lib/varnish'],
require => [
Systemd::Mask['varnishncsa.service'],
Systemd::Mask['varnishlog.service'],
],
}
} else {
apt::package_from_component { 'varnish':
component => $packages_component,
packages => $packages,
before => Mount['/var/lib/varnish'],
require => [
Systemd::Mask['varnishncsa.service'],
Systemd::Mask['varnishlog.service'],
],
priority => 1002, # Take precedence over main
}
}
# Mount /var/lib/varnish as tmpfs to avoid Linux flushing mlocked
# shm memory to disk
mount { '/var/lib/varnish':
ensure => mounted,
device => 'tmpfs',
fstype => 'tmpfs',
options => 'noatime,defaults,size=512M',
pass => 0,
dump => 0,
}
# Frontend memory cache sizing
$sys_mem_gb = $facts['memory']['system']['total_bytes'] / 1073741824.0
if ($sys_mem_gb < ($fe_mem_gb_reserved + 1.0)) {
# virtuals, test hosts, etc...
$fe_mem_gb = 1
} else {
$fe_mem_gb = ceiling($sys_mem_gb - $fe_mem_gb_reserved)
}
$vcl_config = $fe_vcl_config + {
req_handling => $req_handling,
alternate_domains => $alternate_domains,
fe_mem_gb => $fe_mem_gb,
do_esitest => $do_esitest,
beacon_uri_regex => $fe_beacon_uri_regex,
}
# VCL files common to all instances
class { 'varnish::common::vcl':
vcl_config => $vcl_config,
}
$separate_vcl_frontend = $separate_vcl.map |$vcl| { "${vcl}-frontend" }
# Single-backend nodes (only those with the new 6.4TB NVMe)
if $single_backend {
$backend_caches = [ $facts['networking']['fqdn'] ]
$etcd_backends = false
} else {
$backend_caches = $cache_nodes[$cache_cluster][$::site]
$etcd_backends = $backends_in_etcd
}
# Dynamic configuration sourced from etcd.
$reload_vcl_opts = varnish::reload_vcl_opts($vcl_config['varnish_probe_ms'],
$separate_vcl_frontend, 'frontend', "${cache_cluster}-frontend")
$directors_keyspaces = [ "${conftool_prefix}/pools/${::site}/cache_${cache_cluster}/ats-be" ]
# This is the etcd-driven list of backends for this frontend for chashing,
# but deployment-prep and single-backend cases will have a false
# $etcd_backends and thus hit ensure => absent below
confd::file {
'/etc/varnish/directors.frontend.vcl':
ensure => bool2str($etcd_backends, 'present', 'absent'),
reload => "/usr/local/bin/confd-reload-vcl varnish-frontend ${reload_vcl_opts}",
before => Service['varnish-frontend'],
watch_keys => $directors_keyspaces,
content => template('profile/cache/varnish-frontend.directors.vcl.tpl.erb');
}
if $use_etcd_req_filters {
confd::file {
default:
ensure => present,
reload => "/usr/local/bin/confd-reload-vcl varnish-frontend ${reload_vcl_opts}",
before => Service['varnish-frontend'];
'/etc/varnish/blocked-nets.inc.vcl':
watch_keys => ['/request-ipblocks/abuse'],
content => template('profile/cache/blocked-nets.inc.vcl.tpl.erb'),
prefix => $conftool_prefix;
# request filter actions based on the content of the /request-vcl
# tree in conftool.
'/etc/varnish/requestctl-filters.inc.vcl':
watch_keys => ["/request-vcl/cache-${cache_cluster}"],
content => template('profile/cache/varnish-frontend-requestctl-filters.vcl.tpl.erb'),
prefix => $conftool_prefix;
'/etc/varnish/requestctl-filters-hit.inc.vcl':
watch_keys => ["/request-vcl/cache-${cache_cluster}"],
content => template('profile/cache/varnish-frontend-requestctl-filters-hit.vcl.tpl.erb'),
prefix => $conftool_prefix;
}
} else {
# deployment-prep still uses the old template.
$abuse_networks = network::parse_abuse_nets('varnish')
file { '/etc/varnish/blocked-nets.inc.vcl':
ensure => present,
content => template('profile/cache/blocked-nets.inc.vcl.erb'),
owner => 'root',
group => 'root',
mode => '0444',
}
file { ['/etc/varnish/requestctl-filters.inc.vcl', '/etc/varnish/requestctl-filters-hit.inc.vcl']:
ensure => absent,
}
}
# Transient storage limits T164768
if $fe_transient_gb > 0 {
$fe_transient_storage = "-s Transient=malloc,${fe_transient_gb}G"
} else {
$fe_transient_storage = ''
}
# Raise maximum number of memory map areas per process from 65530 to
# $vm_max_map_count. See https://www.kernel.org/doc/Documentation/sysctl/vm.txt.
# Varnish frontend crashes with "Error in munmap(): Cannot allocate
# memory" are likely due to the varnish child process reaching this limit.
# https://phabricator.wikimedia.org/T242417
$vm_max_map_count = 262120
sysctl::parameters { 'maximum map count':
values => {
'vm.max_map_count' => $vm_max_map_count,
},
}
class { 'prometheus::node_varnishd_mmap_count':
service => 'varnish-frontend.service',
}
# Monitor the mmap usage of varnish; Make sure it doesn't exceed the system limits
class { 'prometheus::node_sysctl': }
prometheus::node_varnish_params { 'prometheus-varnish-params':
param_thread_pool_max => $thread_pool_max,
outfile => '/var/lib/prometheus/node.d/varnish_params.prom',
}
# Monitor number of varnish file descriptors. Initially added to track
# T243634 but generally useful.
prometheus::node_file_count {'track vcache fds':
paths => [ '/proc/$(pgrep -u vcache)/fd' ],
outfile => '/var/lib/prometheus/node.d/vcache_fds.prom',
metric => 'node_varnish_filedescriptors_total',
}
varnish::instance { "${cache_cluster}-frontend":
instance_name => 'frontend',
vcl => "${cache_cluster}-frontend",
separate_vcl => $separate_vcl_frontend,
extra_vcl => $fe_extra_vcl,
tcp_addrs => [ '127.0.0.1:3127' ],
admin_port => 6082,
runtime_params => join(prefix($runtime_params, '-p '), ' '),
storage => "-s malloc,${fe_mem_gb}G ${fe_transient_storage}",
jemalloc_conf => $fe_jemalloc_conf,
backend_caches => $backend_caches,
backend_options => $fe_cache_be_opts,
backends_in_etcd => $etcd_backends,
vcl_config => $vcl_config,
wikimedia_nets => $wikimedia_nets,
wikimedia_trust => $wikimedia_trust,
wikimedia_domains => $wikimedia_domains,
wmcs_domains => $wmcs_domains,
listen_uds => $listen_uds,
uds_owner => $uds_owner,
uds_group => $uds_group,
uds_mode => $uds_mode,
privileged_uds => $privileged_uds,
enable_monitoring => $enable_monitoring,
thread_pool_max => $thread_pool_max,
vsl_size => $vsl_size,
etcd_filters => $use_etcd_req_filters,
ip_reputation => $use_ip_reputation,
}
}
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