nsd-control(8) nsd 4.10.1 nsd-control(8)
NAME
nsd-control, nsd-control-setup - NSD remote server control utility.
SYNOPSIS
nsd-control [-c cfgfile] [-s server] command
DESCRIPTION
nsd-control performs remote administration on the nsd(8) DNS server.
It reads the configuration file, contacts the nsd server over SSL,
sends the command and displays the result. Commands that require a
reload are queued and the result indicates the command was accepted.
The available options are:
-h Show the version and commandline option help.
-c cfgfile
The config file to read with settings. If not given the default
config file /etc/nsd/nsd.conf is used.
-s server[@port]
IPv4 or IPv6 address of the server to contact. If not given,
the address is read from the config file.
COMMANDS
There are several commands that the server understands.
start Start the server. Simply execs nsd(8). The nsd executable is
not searched for in the PATH set in the environment. Instead
the default location relative to the installation prefix speci-
fied at compile-time. The executable location can be overridden
by setting NSD_PATH in the environment. It is started with the
config file specified using -c or the default config file.
stop Stop the server. The server daemon exits.
reload [<zone>]
Reload zonefiles and reopen logfile. Without argument reads
changed zonefiles. With argument reads the zonefile for the
given zone and loads it.
reconfig
Reload nsd.conf and apply changes to TSIG keys and configuration
patterns, and apply the changes to add and remove zones that are
mentioned in the config. Other changes are not applied, such as
listening ip address and port and chroot, also per-zone statis-
tics are not applied. The pattern updates means that the con-
figuration options for zones (request-xfr, zonefile, notify,
...) are updated. Also new patterns are available for use with
the addzone command.
repattern
Same as the reconfig option.
log_reopen
Reopen the logfile, for log rotate that wants to move the log-
file away and create a new logfile. The log can also be re-
opened with kill -HUP (which also reloads all zonefiles).
status Display server status. Exit code 3 if not running (the connec-
tion to the port is refused), 1 on error, 0 if running.
stats Output a sequence of name=value lines with statistics informa-
tion, requires NSD to be compiled with this option enabled.
stats_noreset
Same as stats, but does not zero the counters.
addzone <zone name> <pattern name>
Add a new zone to the running server. The zone is added to the
zonelist file on disk, so it stays after a restart. The pattern
name determines the options for the new zone. For secondary
zones a zone transfer is immediately attempted. For zones with
a zonefile, the zone file is attempted to be read in.
delzone <zone name>
Remove the zone from the running server. The zone is removed
from the zonelist file on disk, from the nsd.db file and from
the memory. If it had a zonefile, this remains (but may be out-
dated). Zones configured inside nsd.conf itself cannot be re-
moved this way because the daemon does not write to the nsd.conf
file, you need to add such zones to the zonelist file to be able
to delete them with the delzone command.
changezone <zone name> <pattern name>
Change a zone to use the pattern for options. The zone is
deleted and added in one operation, changing it to use the new
pattern for the zone options. Zones configured in nsd.conf can-
not be changed like this, instead edit the nsd.conf (or the in-
cluded file in nsd.conf) and reconfig.
addzones
Add zones read from stdin of nsd-control. Input is read per
line, with name space patternname on a line. For bulk addi-
tions.
delzones
Remove zones read from stdin of nsd-control. Input is one name
per line. For bulk removals.
write [<zone>]
Write zonefiles to disk, or the given zonefile to disk. Zones
that have changed (via AXFR or IXFR) are written, or if the
zonefile has not been created yet then it is created. Directory
components of the zonefile path are created if necessary. With
argument that zone is written if it was modified, without argu-
ment, all modified zones are written.
notify [<zone>]
Send NOTIFY messages to secondary servers. Sends to the IP ad-
dresses configured in the 'notify:' lists for the primary zones
hosted on this server. Usually NSD sends NOTIFY messages right
away when a primary zone serial is updated. If a zone is given,
notifies are sent for that zone. These secondary servers are
supposed to initiate a zone transfer request later (to this
server or another primary), this can be allowed via the 'pro-
vide-xfr:' acl list configuration. With argument that zone is
processed, without argument, all zones are processed.
transfer [<zone>]
Attempt to update secondary zones that are hosted on this server
by contacting the primaries. The primaries are configured via
'request-xfr:' lists. If a zone is given, that zone is updated.
Usually NSD receives a NOTIFY from the primaries (configured via
'allow-notify:' acl list) that a new zone serial has to be
transferred. For zones with no content, NSD may have backed off
from asking often because the primaries did not respond, but
this command will reset the backoff to its initial timeout, for
frequent retries. With argument that zone is transferred, with-
out argument, all zones are transferred.
force_transfer [<zone>]
Force update secondary zones that are hosted on this server.
Even if the primary hosts the same serial number of the zone, a
full AXFR is performed to fetch it. If you want to use IXFR and
check that the serial number increases, use the 'transfer' com-
mand. With argument that zone is transferred, without argument,
all zones are transferred.
zonestatus [<zone>]
Print state of the zone, the serial numbers and since when they
have been acquired. Also prints the notify action (to which
server), and zone transfer (and from which primary) if there is
activity right now. The state of the zone is printed as: 'pri-
mary' (primary zones), 'ok' (secondary zone is up-to-date), 'ex-
pired' (secondary zone has expired), 'refreshing' (secondary
zone has transfers active). The serial numbers printed are the
'served-serial' (currently active), the 'commit-serial' (is in
reload), the 'notified-serial' (got notify, busy fetching the
data). The serial numbers are only printed if such a serial
number is available. With argument that zone is printed, without
argument, all zones are printed.
serverpid
Prints the PID of the server process. This is used for statis-
tics (and only works when NSD is compiled with statistics en-
abled). This pid is not for sending unix signals, use the pid
from nsd.pid for that, that pid is also stable.
verbosity <number>
Change logging verbosity.
print_tsig [<key_name>]
print the secret and algorithm for the TSIG key with that name.
Or list all the tsig keys with their name, secret and algorithm.
update_tsig <name> <secret>
Change existing TSIG key with name to the new secret. The se-
cret is a base64 encoded string. The changes are only in-memory
and are gone next restart, for lasting changes edit the nsd.conf
file or a file included from it.
add_tsig <name> <secret> [algo]
Add a new TSIG key with the given name, secret and algorithm.
Without algorithm a default (hmac-sha256) algorithm is used.
The secret is a base64 encoded string. The changes are only in-
memory and are gone next restart, for lasting changes edit the
nsd.conf file or a file included from it.
assoc_tsig <zone> <key_name>
Associate the zone with the given tsig. The access control
lists for notify, allow-notify, provide-xfr and request-xfr are
adjusted to use the given key.
del_tsig <key_name>
Delete the TSIG key with the given name. Prints error if the
key is still in use by some zone. The changes are only in-mem-
ory and are gone next restart, for lasting changes edit the
nsd.conf file or a file included from it.
add_cookie_secret <secret>
Add or replace a cookie secret persistently. <secret> needs to
be an 128 bit hex string.
Cookie secrets can be either active or staging. Active cookie
secrets are used to create DNS Cookies, but verification of a
DNS Cookie succeeds with any of the active or staging cookie se-
crets. The state of the current cookie secrets can be printed
with the print_cookie_secrets command.
When there are no cookie secrets configured yet, the <secret> is
added as active. If there is already an active cookie secret,
the <secret> is added as staging or replacing an existing stag-
ing secret.
To "roll" a cookie secret used in an anycast set. The new secret
has to be added as staging secret to all nodes in the anycast
set. When all nodes can verify DNS Cookies with the new secret,
the new secret can be activated with the activate_cookie_secret
command. After all nodes have the new secret active for at least
one hour, the previous secret can be dropped with the
drop_cookie_secret command.
Persistence is accomplished by writing to a file which if con-
figured with the cookie-secret-file option in the server section
of the config file. The default value for that is:
/etc/nsd/nsd_cookiesecrets.txt .
drop_cookie_secret
Drop the staging cookie secret.
activate_cookie_secret
Make the current staging cookie secret active, and the current
active cookie secret staging.
print_cookie_secrets
Show the current configured cookie secrets with their status.
EXIT CODE
The nsd-control program exits with status code 1 on error, 0 on suc-
cess.
SET UP
The setup requires a self-signed certificate and private keys for both
the server and client. The script nsd-control-setup generates these in
the default run directory, or with -d in another directory. If you
change the access control permissions on the key files you can decide
who can use nsd-control, by default owner and group but not all users.
The script preserves private keys present in the directory. After run-
ning the script as root, turn on control-enable in nsd.conf.
STATISTIC COUNTERS
The stats command shows a number of statistic counters.
num.queries
number of queries received (the tls, tcp and udp queries added
up).
serverX.queries
number of queries handled by the server process. The number of
server processes is set with the config statement server-count.
time.boot
uptime in seconds since the server was started. With fractional
seconds.
time.elapsed
time since the last stats report, in seconds. With fractional
seconds. Can be zero if polled quickly and the previous stats
command resets the counters, so that the next gets a fully zero,
and zero elapsed time, report.
size.db.disk
size of nsd.db on disk, in bytes.
size.db.mem
size of the DNS database in memory, in bytes.
size.xfrd.mem
size of memory for zone transfers and notifies in xfrd process,
excludes TSIG data, in bytes.
size.config.disk
size of zonelist file on disk, excludes the nsd.conf size, in
bytes.
size.config.mem
size of config data in memory, kept twice in server and xfrd
process, in bytes.
num.type.X
number of queries with this query type.
num.opcode.X
number of queries with this opcode.
num.class.X
number of queries with this query class.
num.rcode.X
number of answers that carried this return code.
num.edns
number of queries with EDNS OPT.
num.ednserr
number of queries which failed EDNS parse.
num.udp
number of queries over UDP ip4.
num.udp6
number of queries over UDP ip6.
num.tcp
number of connections over TCP ip4.
num.tcp6
number of connections over TCP ip6.
num.tls
number of connections over TLS ip4. TLS queries are not part of
num.tcp.
num.tls6
number of connections over TLS ip6. TLS queries are not part of
num.tcp6.
num.answer_wo_aa
number of answers with NOERROR rcode and without AA flag, this
includes the referrals.
num.rxerr
number of queries for which the receive failed.
num.txerr
number of answers for which the transmit failed.
num.raxfr
number of AXFR requests from clients (that got served with re-
ply).
num.rixfr
number of IXFR requests from clients (that got served with re-
ply).
num.truncated
number of answers with TC flag set.
num.dropped
number of queries that were dropped because they failed sanity
check.
zone.primary
number of primary zones served. These are zones with no 're-
quest-xfr:' entries. Also output as 'zone.master' for backwards
compatibility.
zone.secondary
number of secondary zones served. These are zones with 're-
quest-xfr' entries. Also output as 'zone.slave' for backwards
compatibility.
FILES
/etc/nsd/nsd.conf
nsd configuration file.
/etc/nsd
directory with private keys (nsd_server.key and nsd_control.key)
and self-signed certificates (nsd_server.pem and nsd_con-
trol.pem).
SEE ALSO
nsd.conf(5), nsd(8), nsd-checkconf(8)
NLnet Labs Aug 2, 2024 nsd-control(8)
