diff options
Diffstat (limited to 'src/migration-scripts/cluster/1-to-2')
| -rwxr-xr-x | src/migration-scripts/cluster/1-to-2 | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/migration-scripts/cluster/1-to-2 b/src/migration-scripts/cluster/1-to-2 new file mode 100755 index 000000000..a2e589155 --- /dev/null +++ b/src/migration-scripts/cluster/1-to-2 @@ -0,0 +1,193 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2023 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 re +import sys + +from vyos.configtree import ConfigTree + +if __name__ == '__main__': + if len(sys.argv) < 2: + print("Must specify file name!") + sys.exit(1) + + file_name = sys.argv[1] + + with open(file_name, 'r') as f: + config_file = f.read() + + config = ConfigTree(config_file) + + if not config.exists(['cluster']): + # Cluster is not set -- nothing to do at all + sys.exit(0) + + # If at least one cluster group is defined, we have real work to do. + # If there are no groups, we remove the top-level cluster node at the end of this script anyway. + if config.exists(['cluster', 'group']): + # First, gather timer and interface settings to duplicate them in all groups, + # since in the old cluster they are global, but in VRRP they are always per-group + + global_interface = None + if config.exists(['cluster', 'interface']): + global_interface = config.return_value(['cluster', 'interface']) + else: + # Such configs shouldn't exist in practice because interface is a required option. + # But since it's possible to specify interface inside 'service' options, + # we may be able to convert such configs nonetheless. + print("Warning: incorrect cluster config: interface is not defined.", file=sys.stderr) + + # There are three timers: advertise-interval, dead-interval, and monitor-dead-interval + # Only the first one makes sense for the VRRP, we translate it to advertise-interval + advertise_interval = None + if config.exists(['cluster', 'keepalive-interval']): + advertise_interval = config.return_value(['cluster', 'keepalive-interval']) + + if advertise_interval is not None: + # Cluster had all timers in milliseconds, so we need to convert them to seconds + # And ensure they are not shorter than one second + advertise_interval = int(advertise_interval) // 1000 + if advertise_interval < 1: + advertise_interval = 1 + + # Cluster had password as a global option, in VRRP it's per-group + password = None + if config.exists(['cluster', 'pre-shared-secret']): + password = config.return_value(['cluster', 'pre-shared-secret']) + + # Set up the stage for converting cluster groups to VRRP groups + free_vrids = set(range(1,255)) + vrrp_base_path = ['high-availability', 'vrrp', 'group'] + if not config.exists(vrrp_base_path): + # If VRRP is not set up, create a node and set it to 'tag node' + # Setting it to 'tag' is not mandatory but it's better to be consistent + # with configs produced by 'save' + config.set(vrrp_base_path) + config.set_tag(vrrp_base_path) + else: + # If there are VRRP groups already, we need to find the set of unused VRID numbers to avoid conflicts + existing_vrids = set() + for vg in config.list_nodes(vrrp_base_path): + existing_vrids.add(int(config.return_value(vrrp_base_path + [vg, 'vrid']))) + free_vrids = free_vrids.difference(existing_vrids) + + # Now handle cluster groups + groups = config.list_nodes(['cluster', 'group']) + for g in groups: + base_path = ['cluster', 'group', g] + service_names = config.return_values(base_path + ['service']) + + # Cluster used to allow services other than IP addresses, at least nominally + # Whether that ever worked is a big question, but we need to consider that, + # since configs with custom services are definitely impossible to meaningfully migrate now + services = {"ip": [], "other": []} + for s in service_names: + if re.match(r'^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/\d{1,2})(/[a-z]+\d+)?$', s): + services["ip"].append(s) + else: + services["other"].append(s) + + if services["other"]: + print("Cluster config includes non-IP address services and cannot be migrated", file=sys.stderr) + sys.exit(1) + + # Cluster allowed virtual IPs for different interfaces within a single group. + # VRRP groups are by definition bound to interfaces, so we cannot migrate such configurations. + # Thus we need to find out if all addresses either leave the interface unspecified + # (in that case the global 'cluster interface' option is used), + # or have the same interface, or have the same interface as the global 'cluster interface'. + + # First, we collect all addresses and check if they have interface specified + # If not, we substitute the global interface option + # or throw an error if it's not in the config. + ips = [] + for ip in services["ip"]: + ip_with_intf = re.match(r'^(?P<ip>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\/\d{1,2})/(?P<intf>[a-z]+\d+)$', ip) + if ip_with_intf: + ips.append({"ip": ip_with_intf.group("ip"), "interface": ip_with_intf.group("intf")}) + else: + if global_interface is not None: + ips.append({"ip": ip, "interface": global_interface}) + else: + print("Error: cluster has groups with IPs without interfaces and 'cluster interface' is not specified.", file=sys.stderr) + sys.exit(1) + + # Then we check if all addresses are for the same interface. + intfs_set = set(map(lambda i: i["interface"], ips)) + if len(intfs_set) > 1: + print("Error: cluster group has addresses for different interfaces", file=sys.stderr) + sys.exit(1) + + # If we got this far, the group is migratable. + + # Extract the interface from the set -- we know there's only a single member. + interface = intfs_set.pop() + + addresses = list(map(lambda i: i["ip"], ips)) + vrrp_path = ['high-availability', 'vrrp', 'group', g] + + # If there's already a VRRP group with exactly the same name, + # we probably shouldn't try to make up a unique name, just leave migration to the user... + if config.exists(vrrp_path): + print("Error: VRRP group with the same name as a cluster group already exists", file=sys.stderr) + sys.exit(1) + + config.set(vrrp_path + ['interface'], value=interface) + for a in addresses: + config.set(vrrp_path + ['virtual-address'], value=a, replace=False) + + # Take the next free VRID and assign it to the group + vrid = free_vrids.pop() + config.set(vrrp_path + ['vrid'], value=vrid) + + # Convert the monitor option to VRRP ping health check + if config.exists(base_path + ['monitor']): + monitor_ip = config.return_value(base_path + ['monitor']) + config.set(vrrp_path + ['health-check', 'ping'], value=monitor_ip) + + # Convert "auto-failback" to "no-preempt", if necessary + if config.exists(base_path + ['auto-failback']): + # It's a boolean node that requires "true" or "false" + # so if it exists we still need to check its value + auto_failback = config.return_value(base_path + ['auto-failback']) + if auto_failback == "false": + config.set(vrrp_path + ['no-preempt']) + else: + # It's "true" or we assume it is, which means preemption is desired, + # and in VRRP config it's the default + pass + else: + # The old default for that option is false + config.set(vrrp_path + ['no-preempt']) + + # Inject settings from the global cluster config that have to be per-group in VRRP + if advertise_interval is not None: + config.set(vrrp_path + ['advertise-interval'], value=advertise_interval) + + if password is not None: + config.set(vrrp_path + ['authentication', 'password'], value=password) + config.set(vrrp_path + ['authentication', 'type'], value='plaintext-password') + + # Finally, clean up the old cluster node + config.delete(['cluster']) + + try: + with open(file_name, 'w') as f: + f.write(config.to_string()) + except OSError as e: + print("Failed to save the modified config: {}".format(e)) + sys.exit(1) |