From 3628121505658fd4c588960136d5645afc791c59 Mon Sep 17 00:00:00 2001 From: Viacheslav Date: Mon, 27 Dec 2021 07:58:30 +0000 Subject: keepalived: T4109: Add high-availability virtual-server Add new feature, high-availability virtual-server Change XML, python and templates Move vrrp to root node 'high-availability' as all logic are handler by root node 'high-availability' --- src/conf_mode/high-availability.py | 180 +++++++++++++++++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100755 src/conf_mode/high-availability.py (limited to 'src/conf_mode/high-availability.py') diff --git a/src/conf_mode/high-availability.py b/src/conf_mode/high-availability.py new file mode 100755 index 000000000..7d51bb393 --- /dev/null +++ b/src/conf_mode/high-availability.py @@ -0,0 +1,180 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2018-2022 VyOS maintainers and contributors +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 2 or later as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +import os + +from sys import exit +from ipaddress import ip_interface +from ipaddress import IPv4Interface +from ipaddress import IPv6Interface + +from vyos.config import Config +from vyos.configdict import dict_merge +from vyos.ifconfig.vrrp import VRRP +from vyos.template import render +from vyos.template import is_ipv4 +from vyos.template import is_ipv6 +from vyos.util import call +from vyos.util import is_systemd_service_running +from vyos.xml import defaults +from vyos import ConfigError +from vyos import airbag +airbag.enable() + +def get_config(config=None): + if config: + conf = config + else: + conf = Config() + + base = ['high-availability'] + base_vrrp = ['high-availability', 'vrrp'] + if not conf.exists(base): + return None + + ha = conf.get_config_dict(base, key_mangling=('-', '_'), + get_first_key=True, no_tag_node_value_mangle=True) + # We have gathered the dict representation of the CLI, but there are default + # options which we need to update into the dictionary retrived. + if 'vrrp' in ha: + if 'group' in ha['vrrp']: + default_values_vrrp = defaults(base_vrrp + ['group']) + for group in ha['vrrp']['group']: + ha['vrrp']['group'][group] = dict_merge(default_values_vrrp, ha['vrrp']['group'][group]) + + # Merge per virtual-server default values + if 'virtual_server' in ha: + default_values = defaults(base + ['virtual-server']) + for vs in ha['virtual_server']: + ha['virtual_server'][vs] = dict_merge(default_values, ha['virtual_server'][vs]) + + ## Get the sync group used for conntrack-sync + conntrack_path = ['service', 'conntrack-sync', 'failover-mechanism', 'vrrp', 'sync-group'] + if conf.exists(conntrack_path): + ha['conntrack_sync_group'] = conf.return_value(conntrack_path) + + return ha + +def verify(ha): + if not ha: + return None + + used_vrid_if = [] + if 'vrrp' in ha and 'group' in ha['vrrp']: + for group, group_config in ha['vrrp']['group'].items(): + # Check required fields + if 'vrid' not in group_config: + raise ConfigError(f'VRID is required but not set in VRRP group "{group}"') + + if 'interface' not in group_config: + raise ConfigError(f'Interface is required but not set in VRRP group "{group}"') + + if 'address' not in group_config: + raise ConfigError(f'Virtual IP address is required but not set in VRRP group "{group}"') + + if 'authentication' in group_config: + if not {'password', 'type'} <= set(group_config['authentication']): + raise ConfigError(f'Authentication requires both type and passwortd to be set in VRRP group "{group}"') + + # We can not use a VRID once per interface + interface = group_config['interface'] + vrid = group_config['vrid'] + tmp = {'interface': interface, 'vrid': vrid} + if tmp in used_vrid_if: + raise ConfigError(f'VRID "{vrid}" can only be used once on interface "{interface}"!') + used_vrid_if.append(tmp) + + # Keepalived doesn't allow mixing IPv4 and IPv6 in one group, so we mirror that restriction + + # XXX: filter on map object is destructive, so we force it to list. + # Additionally, filter objects always evaluate to True, empty or not, + # so we force them to lists as well. + vaddrs = list(map(lambda i: ip_interface(i), group_config['address'])) + vaddrs4 = list(filter(lambda x: isinstance(x, IPv4Interface), vaddrs)) + vaddrs6 = list(filter(lambda x: isinstance(x, IPv6Interface), vaddrs)) + + if vaddrs4 and vaddrs6: + raise ConfigError(f'VRRP group "{group}" mixes IPv4 and IPv6 virtual addresses, this is not allowed.\n' \ + 'Create individual groups for IPv4 and IPv6!') + if vaddrs4: + if 'hello_source_address' in group_config: + if is_ipv6(group_config['hello_source_address']): + raise ConfigError(f'VRRP group "{group}" uses IPv4 but hello-source-address is IPv6!') + + if 'peer_address' in group_config: + if is_ipv6(group_config['peer_address']): + raise ConfigError(f'VRRP group "{group}" uses IPv4 but peer-address is IPv6!') + + if vaddrs6: + if 'hello_source_address' in group_config: + if is_ipv4(group_config['hello_source_address']): + raise ConfigError(f'VRRP group "{group}" uses IPv6 but hello-source-address is IPv4!') + + if 'peer_address' in group_config: + if is_ipv4(group_config['peer_address']): + raise ConfigError(f'VRRP group "{group}" uses IPv6 but peer-address is IPv4!') + # Check sync groups + if 'vrrp' in ha and 'sync_group' in ha['vrrp']: + for sync_group, sync_config in ha['vrrp']['sync_group'].items(): + if 'member' in sync_config: + for member in sync_config['member']: + if member not in ha['vrrp']['group']: + raise ConfigError(f'VRRP sync-group "{sync_group}" refers to VRRP group "{member}", '\ + 'but it does not exist!') + + # Virtual-server + if 'virtual_server' in ha: + for vs, vs_config in ha['virtual_server'].items(): + if 'port' not in vs_config: + raise ConfigError(f'Port is required but not set for virtual-server "{vs}"') + if 'real_server' not in vs_config: + raise ConfigError(f'Real-server ip is required but not set for virtual-server "{vs}"') + # Real-server + for rs, rs_config in vs_config['real_server'].items(): + if 'port' not in rs_config: + raise ConfigError(f'Port is required but not set for virtual-server "{vs}" real-server "{rs}"') + + +def generate(ha): + if not ha: + return None + + render(VRRP.location['config'], 'high-availability/keepalived.conf.tmpl', ha) + return None + +def apply(ha): + service_name = 'keepalived.service' + if not ha: + call(f'systemctl stop {service_name}') + return None + + # XXX: T3944 - reload keepalived configuration if service is already running + # to not cause any service disruption when applying changes. + if is_systemd_service_running(service_name): + call(f'systemctl reload {service_name}') + else: + call(f'systemctl restart {service_name}') + return None + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) -- cgit v1.2.3