Puppet Class: profile::lvs::realserver::ipip
- Defined in:
- modules/profile/manifests/lvs/realserver/ipip.pp
Overview
SPDX-License-Identifier: Apache-2.0
Class profile::lvs::realserver::ipip.
Sets up the LVS realserver dependencies to handle IPIP encapsulated ingress traffic
Parameters
- pools
-
Pools in the format: {$lvs_name => { services => [$svc1,$svc2,…] } where the services listed are the ones that are needed to serve the lvs pool. So for example if you need both apache and php7 to serve a request from a pool, both should be included.
- enabled
-
Whether to use IPIP encapsulation or not. Allows fine control per host. defaults to false.
- ipv4_mss
-
TCP MSS value for IPv4 traffic. Defaults to 1400 bytes
- ipv6_mss
-
TCP MSS value for IPv6 traffic. Defaults to 1400 bytes
- interfaces
-
Network interfaces handling egress traffic on the realserver. Defaults to the primary interface
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# File 'modules/profile/manifests/lvs/realserver/ipip.pp', line 20
class profile::lvs::realserver::ipip(
Hash $pools = lookup('profile::lvs::realserver::pools', {'default_value' => {}}),
Boolean $enabled = lookup('profile::lvs::realserver::ipip::enabled', {'default_value' => false}),
Integer[536, 1480] $ipv4_mss = lookup('profile::lvs::realserver::ipip::ipv4_mss', {'default_value' => 1400}),
Integer[1220, 1440] $ipv6_mss = lookup('profile::lvs::realserver::ipip::ipv6_mss', {'default_value' => 1400}),
Array[String, 1] $interfaces = lookup('profile::lvs::realserver::ipip::interfaces'),
Firewall::Provider $firewall_provider = lookup('profile::firewall::provider'),
) {
$present_pools = $pools.keys()
$services = wmflib::service::fetch(true).filter |$lvs_name, $svc| {$lvs_name in $present_pools}
$clamped_ipport = wmflib::service::get_ipport_for_ipip_services($services, $::site)
$ensure = stdlib::ensure($enabled)
$ensure_clamper = stdlib::ensure($enabled and $firewall_provider == 'none')
$ensure_ferm_mss = stdlib::ensure($enabled and $firewall_provider == 'ferm')
if $enabled and $ensure_clamper == 'absent' and $ensure_ferm_mss == 'absent' {
fail('unsupported realserver setup')
}
# Provide ingress interfaces for both IPv4 and IPv6 traffic
interface::ipip { 'ipip_ipv4':
ensure => $ensure,
interface => 'ipip0',
family => 'inet',
address => '127.0.0.42',
}
interface::ipip { 'ipip_ipv6':
ensure => $ensure,
interface => 'ipip60',
family => 'inet6',
}
$interfaces.each |String $interface| {
interface::clsact { "clsact_${interface}":
ensure => $ensure_clamper,
interface => $interface,
}
}
if $enabled {
$disable_rp_filter_ifaces = ['ipip0', 'ipip60', $facts['interface_primary']]
$disable_rp_filter_ifaces.each |String $interface| {
$require_interface = $interface? {
'ipip0' => Interface::Ipip['ipip_ipv4'],
'ipip60' => Interface::Ipip['ipip_ipv6'],
default => undef,
}
exec { "disable-rp-filter-${interface}":
command => "/usr/sbin/sysctl -q net.ipv4.conf.${interface}.rp_filter=0",
unless => "/usr/sbin/sysctl -n net.ipv4.conf.${interface}.rp_filter |grep -- '0'",
require => $require_interface,
}
}
}
# We need TCP MSS clamping here
package { 'tcp-mss-clamper':
ensure => $ensure_clamper,
}
$prometheus_addr = ':2200'
systemd::service { 'tcp-mss-clamper':
ensure => $ensure_clamper,
content => systemd_template('tcp-mss-clamper'),
monitoring_enabled => true,
monitoring_notes_url => 'https://wikitech.wikimedia.org/wiki/LVS#IPIP_encapsulation_experiments',
restart => false,
}
if $ensure_clamper == 'present' {
exec { 'enable_tcp-mss-clamper_service':
command => '/usr/bin/systemctl enable tcp-mss-clamper.service',
unless => '/usr/bin/systemctl -q is-enabled tcp-mss-clamper.service',
require => Systemd::Service['tcp-mss-clamper'],
}
}
if $firewall_provider == 'ferm' {
$ensure_ferm_rules = $ensure
} else {
$ensure_ferm_rules = 'absent'
}
# Allow inbound IPIP && IP6IP6 traffic
ferm::rule { 'ipip':
ensure => $ensure_ferm_rules,
rule => 'saddr 172.16.0.0/12 proto ipencap ACCEPT;',
domain => '(ip)',
}
ferm::rule { 'ip6ip6':
ensure => $ensure_ferm_rules,
rule => 'saddr 0100::/64 proto ipv6 ACCEPT;',
domain => '(ip6)',
}
# ferm based TCP MSS clamping
$clamped_ips = $clamped_ipport.map|$ipport| {
$ipport.match('\[?(.*)\]?:(.*)')[1]
}.flatten().unique().sort()
$clamped_ports = $clamped_ipport.map|$ipport| {
$ipport.match('\[?(.*)\]?:(.*)')[2]
}.flatten().unique().sort()
$rule_ips = $clamped_ips? {
Array[Stdlib::IP::Address, 1, 1] => $clamped_ips[0],
Array => sprintf('(%s)', $clamped_ips.join(' ')),
}
$rule_ports = $clamped_ports? {
Array[Stdlib::Port, 1, 1] => $clamped_ports[0],
Array => sprintf('(%s)', $clamped_ports.join(' ')),
}
$outerfaces = $interfaces.join(' ')
ferm::rule { 'clamp-mss-ipv4':
ensure => $ensure_ferm_mss,
chain => 'OUTPUT',
rule => "outerface (${outerfaces}) saddr @ipfilter(${rule_ips}) proto tcp sport ${rule_ports} tcp-flags (SYN) SYN TCPMSS set-mss ${ipv4_mss};",
domain => '(ip)',
}
ferm::rule { 'clamp-mss-ipv6':
ensure => $ensure_ferm_mss,
chain => 'OUTPUT',
rule => "outerface (${$outerfaces}) saddr @ipfilter(${rule_ips}) proto tcp sport ${rule_ports} tcp-flags (SYN) SYN TCPMSS set-mss ${ipv6_mss};",
domain => '(ip6)',
}
# monitor MSS values
prometheus::node_lvs_realserver_mss { 'lvs_clamped_ipport':
ensure => $ensure,
clamped_ipport => $clamped_ipport,
}
prometheus::node_ferm_mss {'ferm_clamped_ipport':
ensure => $ensure_ferm_mss,
clamped_ipport => $clamped_ipport,
}
}
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