[nsd-users] n00b troubles with slaves
ghe at slsware.com
Mon Jul 8 21:40:43 CEST 2013
I'm trying to set up NSD as the main DNS server for my domain and my virtual users' domains. The master (192.168.2.205) is a BIND server on a local network protected from the 'Net -- the NSD zones are all slaves. The server I'm working on is at 192.168.2.202.
I'm seeing what seem to be contradictions in the books I have, on the 'Net, and the man page. I'm told by most of them that "allow-notify" and "request-xfer" should be the same IP: that of the master. But when that's what I set, 'nsdc update' throws an error saying "allow-notify" isn't set to 127.0.0.1, and several 'Net sites agree. When I set that, nobody complains, but as best I can tell, no zones are transferred. Since the majority (including Evi Nemeth and the man page) votes for the IP of the master, I suspect I'm misunderstanding something.
Here's my config (just making changes to the sample so far):
> root at server:/etc/nsd3# cat nsd.conf
> # 2013-07-05
> # nsd.conf -- the NSD(8) configuration file, nsd.conf(5).
> # Copyright (c) 2001-2011, NLnet Labs. All rights reserved.
> # See LICENSE for the license.
> # options for the nsd server
> # uncomment to specify specific interfaces to bind (default wildcard interface).
> # ip-address: 188.8.131.52
> # ip-address: 184.108.40.206 at 5678
> # ip-address: 12fe::8ef0
> # don't answer VERSION.BIND and VERSION.SERVER CHAOS class queries
> # hide-version: no
> hide-version: yes
> # enable debug mode, does not fork daemon process into the background.
> # debug-mode: no
> # listen only on IPv4 connections
> # ip4-only: no
> ip4-only: yes
> # listen only on IPv6 connections
> # ip6-only: no
> # the database to use
> # database: "/var/lib/nsd3/nsd.db"
> database: "/var/cache/dns/nsd.db"
> # identify the server (CH TXT ID.SERVER entry).
> # identity: "unidentified server"
> identity: ""
> # NSID identity (hex string). default disabled.
> # nsid: "aabbccdd"
> # log messages to file. Default to stderr and syslog (with facility LOG_DAEMON).
> # logfile: "/var/log/nsd.log"
> # Number of NSD servers to fork.
> # server-count: 1
> server-count: 4
> # Maximum number of concurrent TCP connections per server.
> # This option should have a value below 1000.
> # tcp-count: 10
> # Maximum number of queries served on a single TCP connection.
> # By default 0, which means no maximum.
> # tcp-query-count: 0
> tcp-query-count: 5
> # Override the default (120 seconds) TCP timeout.
> # tcp-timeout: 120
> # Preferred EDNS buffer size for IPv4.
> # ipv4-edns-size: 4096
> ipv4-edns-size: 256
> # Preferred EDNS buffer size for IPv6.
> # ipv6-edns-size: 4096
> # File to store pid for nsd in.
> # pidfile: "/var/run/nsd3/nsd.pid"
> pidfile: "/var/run/nsd3/nsd.pid"
> # port to answer queries on. default is 53.
> # port: 53
> # statistics are produced every number of seconds.
> # statistics: 3600
> # if per zone statistics is enabled, file to store statistics.
> # zone-stats-file: "/var/log/nsd.stats"
> # Run NSD in a chroot-jail.
> # make sure to have pidfile and database reachable from there.
> # by default, no chroot-jail is used.
> # chroot: "/etc/nsd3"
> # After binding socket, drop user privileges.
> # can be a username, id or id.gid.
> # username: nsd
> username: nsd
> # The directory for zonefile: files.
> # zonesdir: "/etc/nsd3"
> zonesdir: "/var/cache/dns/slaves"
> # The file where incoming zone transfers are stored.
> # run nsd-patch to update zone files, then you can safely delete it.
> # difffile: "/var/lib/nsd3/ixfr.db"
> difffile: "/var/cache/dns/ixfr.db"
> # The file where secondary zone refresh and expire timeouts are kept.
> # If you delete this file, all secondary zones are forced to be
> # 'refreshing' (as if nsd got a notify).
> # xfrdfile: "/var/lib/nsd3/xfrd.state"
> xfrdfile: "/var/cache/dns/xfrd.state"
> # Number of seconds between reloads triggered by xfrd.
> # xfrd-reload-timeout: 10
> # Verbosity level.
> # verbosity: 0
> # RRLconfig
> # Response Rate Limiting, size of the hashtable. Default 1000000.
> # rrl-size: 1000000
> # Response Rate Limiting, maximum QPS allowed (from one query source).
> # Default 200. If set to 0, ratelimiting is disabled. Also set
> # rrl-whitelist-ratelimit to 0 to disable ratelimit processing.
> # rrl-ratelimit: 200
> # Response Rate Limiting, maximum QPS allowed (from one query source)
> # for whitelisted types. Default 2000.
> # rrl-whitelist-ratelimit: 2000
> # RRLend
> # key for local zones
> name: mskey
> algorithm: hmac-md5
> secret: "K2tf3TRjvQkVCmJF3/Z9vA=="
> # Slave zones
> name: "aerco.net"
> zonefile: "db.aerco.net"
> include: "/etc/nsd3/zoneInclude.txt"
and the include file of everything that's the same in all the zones:
> root at server:/etc/nsd3# cat zoneInclude.txt
> # By default, a slave will request a zone transfer with IXFR/TCP.
> # If you want to make use of IXFR/UDP use
> allow-notify: 127.0.0.1 NOKEY
> request-xfr: 192.168.2.205 NOKEY
> # Allow AXFR fallback if the master does not support IXFR. Default
> # is yes.
> allow-axfr-fallback: "yes"
> # set local interface for sending zone transfer requests.
> outgoing-interface: 192.168.2.202
Just one of the zones is here -- all the others are identical except for the names. The zone files are BIND syntax, and the server is serving DNS quite nicely when I transfer by hand (or rsync), rebuild the database, and reload.
Can someone tell me what I'm doing wrong, and why it's wrong? Is there a book yet explaining how NSD works and what the various config options mean?
BTW, 'nsdc restart' just stops NSD. So does Debian's /etc/init.d/nsd startup file. I've looked at the code, and they aren't the same. A 'nsdc stop' followed by 'nsdc start' do the job.
And there is no log file.
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