inetd.conf, inetd.conf.local - The default configuration
files for the inetd daemon
The default configuration file for all cluster members is:
/etc/inetd.conf
The configuration file for a specific member in a cluster
is: /etc/inetd.conf.local
The inetd.conf.local file is a Context-Dependent Symbolic
Link (CDSL) and must be maintained as such. See System
Administration for more information.
If the inetd daemon is started without specifying an
alternate configuration file, the inetd daemon reads the
inetd.conf file and inetd.conf.local file, in this order,
for information on how to handle Internet service
requests. For this reason, if an entry exists in both
configuration files, the entry in /etc/inetd.conf.local
overrides the entry in /etc/inetd.conf.
The inetd daemon reads its configuration files only when
the inetd daemon starts or when the inetd daemon receives
a SIGHUP signal. Each line in theinetd configuration
files defines how to handle one Internet service request.
Each line is of the form:
ServiceName SocketType ProtocolName Wait/NoWait UserName \
ServerPath ServerArgs
(Note: The backslash and the continuation of information
on to a second line is for display purposes only. In the
configuration file, the entries appear on a single line.)
These fields must be separated by spaces or tabs. Continuation
lines are terminated with a \ (backslash). Comments
are denoted with a # (number sign). The fields have the
following meanings: Specifies the name of an Internet service
defined in the /etc/services file. For services provided
internally by the inetd daemon, this name must be
the official name of the service. That is, the name must
be identical to the first entry on the line that describes
the service in the /etc/services file. Specifies the name
for the type of socket used for the service. You can use
either the stream value for a stream socket, the dgram
value for a datagram socket, the raw value for a raw
socket, the rdm value for a reliably delivered message
socket, or the seqpacket value for a sequenced packet
socket. You can also use xstream and xdgram to permit the
transparent mode of connections for stream and datagram
sockets, respectively. Currently, only application gateways
for firewall services use the transparent mode of
connection. Specifies the name of an Internet protocol
defined in the /etc/protocols file. For example, use the
tcp value for a service that uses the TCP/IP protocol and
the udp value for a service that uses the UDP protocol.
When you use a tcp or udp value, inetd creates
AF_INET sockets; this is the default behavior. If
you want inetd to create AF_INET6 sockets, use the
tcp6 or udp6 value. The inetd daemon maps these
values to the tcp and udp protocol names internally.
For RPC services the field consists of the string
rpc followed by a slash (/) and one of the following:
An asterisk (*) One or more nettypes One or
more netids A combination of nettypes and netids
If you specify an invalid nettype, it is treated as
a netid. For example, if you specify rpc/*, it
specifies the service uses all the transports supported
by the system. Contains either the wait or
the nowait instruction. For datagram servers,
specify wait. This instructs the inetd daemon to
wait for a datagram server to read at least one
datagram from the socket before exiting. Singlethreaded
datagram servers process all incoming
datagrams, then they time out (for example, comsat,
biff, and talkd). Multithreaded datagram servers
read one datagram from the socket, create a new
socket, then fork and exit (for example, tftpd).
For servers using stream sockets, specify nowait
for multithreaded servers. This instructs inetd to
accept connection requests and pass a newly
accepted socket that is connected to the client of
the service to the server. Specify wait for single-threaded
servers. This instructs inetd to pass
the listening socket to the server and wait. The
server must accept at least one connection request
before exiting. Specifies the username that the
inetd daemon should use to start the server. This
variable allows a server to be given less permission
than root. Specifies the full pathname of the
server that the inetd daemon should execute to provide
the service. For services that the inetd daemon
provides internally, this field should be
internal. If you want to disable this service,
this field should be disable in the
/etc/inetd.conf.local file. Specifies the command
line arguments that the inetd daemon is to pass to
the server specified in ServerPath. The arguments
to ServerPath should be just as they normally are,
starting with the name of the program. For services
that the inetd daemon provides internally,
this field should be blank.
The following are sample entries in the /etc/inetd.conf
file for an inetd daemon that: Uses the ftpd daemon for
servicing ftp requests on an AF_INET6 socket Uses the
talkd daemon for ntalk requests on an AF_INET socket Provides
time requests internally on AF_INET6 sockets
ftp stream tcp6 nowait root /usr/sbin/ftpd ftpd ntalk
dgram udp wait root /usr/sbin/talkd talkd time stream tcp6
nowait root internal time dgram udp6 wait root internal
How you enable and disable services in a cluster depends
on the number of cluster members. The following two examples
show the same cluster that has three members (0, 1,
and 2), but shows two diferent methods to accomplish the
same goal. Choose the method most suitable to your
cluster environment.
If you want to enable the ftpd daemon on all cluster members
except member 2, do the following: To enable the ftpd
daemon for all members, enter the following in the
/etc/inetd.conf file:
ftp stream tcp nowait root /usr/sbin/ftpd ftpd To
disable the ftpd daemon for member 2, enter the
following in the /etc/inetd.conf.local for member
2:
ftp stream tcp nowait root disable
If you want to disable the ftpd daemon on all cluster members
(the whole cluster), but enable it on members 0 and
1, do the following: To disable the ftpd daemon by default
for the whole cluster, enter the following in the
/etc/inetd.conf file:
#ftp stream tcp nowait root /usr/sbin/ftpd ftpd To
enable the ftpd daemon for member 0, enter the following
in the /etc/inetd.conf.local file for member
0:
ftp stream tcp nowait root /usr/sbin/ftpd ftpd To
enable the ftpd daemon for member 1, enter the following
in the /etc/inetd.conf.local file for member
1:
ftp stream tcp nowait root /usr/sbin/ftpd ftpd
Member 2 does not have an ftpd entry in its
/etc/inetd.conf.local file. Therefore, the ftpd daemon is
not started.
Commands: biff(1), comsat(8)
Daemons: inetd(8), talkd(8), tftpd(8)
Files: protocols(4), services(4)
inetd.conf(4)
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