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high-availability.py
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high-availability.py
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#!/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 <http://www.gnu.org/licenses/>.
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)

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