nca(1) User Commands nca(1)NAME
nca, snca - the Solaris Network Cache and Accelerator (NCA)
DESCRIPTION
The Solaris Network Cache and Accelerator ("NCA") is a kernel module
designed to provide improved web server performance. The kernel module,
ncakmod, services HTTP requests. To improve the performance of servic‐
ing HTTP requests, the NCA kernel module maintains an in-kernel cache
of web pages. If the NCA kernel module cannot service the request
itself, it passes the request to the http daemon (httpd). It uses
either a sockets interface, with family type designated PF_NCA, or a
private Solaris doors interface that is based on the Solaris doors RPC
mechanism, to pass the request.
To use the sockets interface, the web server must open a socket of fam‐
ily type PF_NCA. The PF_NCA family supports only SOCK_STREAM and proto‐
col 0, otherwise an error occurs.
The following features are not presently supported:
o You cannot initiate a connection from a PF_NCA type socket.
The connect(3SOCKET) interface on PF_NCA fails.
o System calls that are associated with type SO_DGRAM, such as
send(), sendto(), sendmsg(), recv(), recvfrom(), and
recvmsg(), fails.
o You cannot set TCP or IP options on a PF_NCA type socket
through setsockopt(3SOCKET).
The NCA cache consistency is maintained by honoring HTTP headers that
deal with a given content type and expiration date, much the same way
as a proxy cache.
For configuration information, see System Administration Guide: IP Ser‐
vices
When native PF_NCA socket support does not exist in the web server, the
ncad_addr(4) interface must be used to provide NCA support in that web
server.
NCA is intended to be run on a dedicated web server. Running other
large processes while running NCA might cause undesirable behavior.
NCA supports the logging of in-kernel cache hits. See ncalogd.conf(4).
NCA stores logs in a binary format. Use the ncab2clf(1) utility to con‐
vert the log from a binary format to the Common Log File format.
FILES
/etc/nca/ncakmod.conf Lists configuration parameters for NCA.
/etc/nca/ncalogd.conf Lists configuration parameters for NCA log‐
ging.
/etc/nca/nca.if Lists the physical interfaces on which NCA
runs.
/etc/nca/ncaport.conf ncaport configuration file
/etc/hostname.{}{0-9} Lists all physical interfaces configured on
the server.
/etc/hosts Lists all host names associated with the
server. Entries in this file must match with
entries in /etc/hostname.{}{0-9} for NCA to
function.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │system/network/http-cache- │
│ │accelerator (32-bit) │
├─────────────────────────────┼─────────────────────────────┤
│ │SUNWncarx (64-bit) │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOncab2clf(1), ncakmod(1), close(2), read(2), write(2), sendfilev(3EXT),
accept(3SOCKET), bind(3SOCKET), connect(3SOCKET), door_bind(3C),
door_call(3C), door_create(3C), getsockopt(3SOCKET), listen(3SOCKET),
setsockopt(3SOCKET), shutdown(3SOCKET), socket.h(3HEAD),
socket(3SOCKET), ncad_addr(4), nca.if(4), ncakmod.conf(4), nca‐
port.conf(4), ncalogd.conf(4), attributes(5)
System Administration Guide: IP Services
SunOS 5.11 22 Feb 2005 nca(1)
