|named [-4] [-6] [-c config-file] [-d debug-level] [-E engine-name] [-f] [-g] [-M option] [-m flag] [-n #cpus] [-p port] [-s] [-S #max-socks] [-t directory] [-U #listeners] [-u user] [-v] [-V] [-x cache-file]|
named is a Domain Name System (DNS) server, part of the BIND 9 distribution from ISC. For more information on the DNS, see RFCs 1033, 1034, and 1035.
When invoked without arguments, named will read the default configuration file /usr/local/etc/namedb/named.conf, read any initial data, and listen for queries.
-4Use IPv4 only even if the host machine is capable of IPv6. -4 and -6 are mutually exclusive.
-6Use IPv6 only even if the host machine is capable of IPv4. -4 and -6 are mutually exclusive.
-c config-fileUse config-file as the configuration file instead of the default, /usr/local/etc/namedb/named.conf. To ensure that reloading the configuration file continues to work after the server has changed its working directory due to to a possible directory option in the configuration file, config-file should be an absolute pathname.
-d debug-levelSet the daemons debug level to debug-level. Debugging traces from named become more verbose as the debug level increases.
-E engine-nameUse a crypto hardware (OpenSSL engine) for the crypto operations it supports, for instance re-signing with private keys from a secure key store. When compiled with PKCS#11 support engine-name defaults to pkcs11, the empty name resets it to no engine.
-fRun the server in the foreground (i.e. do not daemonize).
-gRun the server in the foreground and force all logging to stderr.
-M optionSets the default memory context options. Currently the only supported option is external, which causes the internal memory manager to be bypassed in favor of system-provided memory allocation functions.
-m flagTurn on memory usage debugging flags. Possible flags are usage, trace, record, size, and mctx. These correspond to the ISC_MEM_DEBUGXXXX flags described in <isc/mem.h>.
-n #cpusCreate #cpus worker threads to take advantage of multiple CPUs. If not specified, named will try to determine the number of CPUs present and create one thread per CPU. If it is unable to determine the number of CPUs, a single worker thread will be created.
-p portListen for queries on port port. If not specified, the default is port 53.
-sWrite memory usage statistics to stdout on exit.Note: This option is mainly of interest to BIND 9 developers and may be removed or changed in a future release.
-S #max-socksAllow named to use up to #max-socks sockets.Warning: This option should be unnecessary for the vast majority of users. The use of this option could even be harmful because the specified value may exceed the limitation of the underlying system API. It is therefore set only when the default configuration causes exhaustion of file descriptors and the operational environment is known to support the specified number of sockets. Note also that the actual maximum number is normally a little fewer than the specified value because named reserves some file descriptors for its internal use.
-t directoryChroot to directory after processing the command line arguments, but before reading the configuration file.Warning: This option should be used in conjunction with the -u option, as chrooting a process running as root doesnt enhance security on most systems; the way chroot(2) is defined allows a process with root privileges to escape a chroot jail.
-U #listenersUse #listeners worker threads to listen for incoming UDP packets on each address. If not specified, named will calculate a default value based on the number of detected CPUs: 1 for 1 CPU, 2 for 2-4 CPUs, and the number of detected CPUs divided by 2 for values higher than 4. If -n has been set to a higher value than the number of detected CPUs, then -U may be increased as high as that value, but no higher.
-u userSetuid to user after completing privileged operations, such as creating sockets that listen on privileged ports.Note: On Linux, named uses the kernels capability mechanism to drop all root privileges except the ability to bind(2) to a privileged port and set process resource limits. Unfortunately, this means that the -u option only works when named is run on kernel 2.2.18 or later, or kernel 2.3.99-pre3 or later, since previous kernels did not allow privileges to be retained after setuid(2).
-vReport the version number and exit.
-VReport the version number and build options, and exit.
-x cache-fileLoad data from cache-file into the cache of the default view.Warning: This option must not be used. It is only of interest to BIND 9 developers and may be removed or changed in a future release.
In routine operation, signals should not be used to control the nameserver; rndc should be used instead.
SIGHUPForce a reload of the server.
SIGINT, SIGTERMShut down the server.
The result of sending any other signals to the server is undefined.
The named configuration file is too complex to describe in detail here. A complete description is provided in the BIND 9 Administrator Reference Manual.
named inherits the umask (file creation mode mask) from the parent process. If files created by named, such as journal files, need to have custom permissions, the umask should be set explicitly in the script used to start the named process.
/usr/local/etc/namedb/named.confThe default configuration file.
/var/run/named/pidThe default process-id file.
RFC 1033, RFC 1034, RFC 1035, named-checkconf(8), named-checkzone(8), rndc(8), lwresd(8), named.conf(5), BIND 9 Administrator Reference Manual.
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|BIND9||NAMED (8)||February 20, 2014|