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Rewrite DNSAggregatorInstance to handle DNS well

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Trying to directly AXFR from dnsmasq is a mess, since their zone is
barely compliant with spec, it doesn't support notifies, and it is
generally really messy.

This implements an advanced "AXFR parser" system, which looks at the
results of an AXFR from the local dnsmasq instances per-network, and
updates the real replicated MariaDB pdns backend cluster with the
changed data. This allows a sensible, transferable zone with its own
SOA that is dynamically reconfigured as hosts come and go from the
dnsmasq zone.
This commit is contained in:
Joshua Boniface
2018-11-18 15:36:54 -05:00
parent b1d0b6e62f
commit 1f58d61cb0
5 changed files with 387 additions and 146 deletions
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26
node-daemon/pvcd.conf.sample
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@ -7,14 +7,16 @@
# nodename section and coordinators list, can be used as-is on a Debian system.
#
# The following values are required for each node or in a default section:
# coordinators: A CSV list of the short hostnames of the coordinator nodes; these nodes become
# coordinators: a CSV list of the short hostnames of the coordinator nodes; these nodes become
# members of the Zookeeper cluster, can act as routers, and perform additional
# special functions in a cluster; ideally there are 3 coordinators, though 5
# coordinators are supported
# dynamic_directory: The ramdisk directory for PVC to store its dynamic configurations,
# cluster_domain: the node cluster domain, set during bootstrap
# storage_domain: the node storage domain, set during bootstrap
# dynamic_directory: the ramdisk directory for PVC to store its dynamic configurations,
# usually under /run or /var/run
# log_directory: The logging directory, usually under /var/log
# file_logging = Whether to log daemon to a file (pvc.log under log_directory) in addition to
# log_directory: the logging directory, usually under /var/log
# file_logging = whether to log daemon to a file (pvc.log under log_directory) in addition to
# normal stdout printing
# keepalive_interval: the interval between keepalives and for dead node timeout (defaults to 5)
# fence_intervals: the number of keepalive_intervals without Zookeeper contact before this node
@ -31,6 +33,15 @@
# flush action; can be "mem", "load", "vcpus", or "vms" (defaults
# to "mem"); the best choice based on this field is selected for
# each VM to be migrated
# pdns_mysql_host: the host address (usually "localhost") of the PowerDNS zone aggregator
# backend database
# pdns_mysql_port: the port (usually "3306") of the PowerDNS zone aggregator backend database
# pdns_mysql_dbname: the database name (usually "pvcdns") of the PowerDNS zone aggregator
# backend database
# pdns_mysql_user: the client username (usually "pvcdns") of the PowerDNS zone aggregator
# backend database
# pdns_mysql_password: the client user password (randomly generated at cluster bootstrap)
# of the PowerDNS zone aggregator backend database
# vni_floating_ip: the IP address (in CIDR format) for the floating IP on the VNI network,
# used to provide a consistent view of the dynamic primary node to other
# machines in the VNI network, e.g. for slaving DNS or sending in routes.
@ -56,6 +67,8 @@
[default]
coordinators = pvc-hv1,pvc-hv2,pvc-hv3
cluster_domain = i.bonilan.net
storage_domain = sx.bonilan.net
dynamic_directory = /run/pvc
log_directory = /var/log/pvc
file_logging = True
@ -65,6 +78,11 @@ suicide_intervals = 0
successful_fence = migrate
failed_fence = none
migration_target_selector = mem
pdns_mysql_host = localhost
pdns_mysql_port = 3306
pdns_mysql_dbname = pvcdns
pdns_mysql_user = pvcdns
pdns_mysql_password = pvcdns
vni_floating_ip = 10.255.0.254/24
upstream_floating_ip = 10.101.0.30/24