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SunOS man pages : snca (1)

User Commands                                              nca(1)


nca, snca - the Solaris Network Cache and Accelerator (NCA)


The Solaris Network Cache and Accelerator ("NCA") is a ker- nel module designed to provide improved web server perfor- mance. The kernel module, ncakmod, services HTTP requests. To improve the performance of servicing 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 family type PF_NCA. The PF_NCA family supports only SOCK_STREAM and protocol 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 will fail. o System calls that are associated with type SO_DGRAM, such as send(), sendto(), sendmsg(), recv(), recvfrom(), and recvmsg(), will fail. 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, Volume 3 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 undesir- able 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 convert the log from a binary format to the Common Log File format. SunOS 5.8 Last change: 28 Sep 2001 1 User Commands nca(1)


/etc/nca/ncakmod.conf Lists configuration parameters for NCA. /etc/nca/ncalogd.conf Lists configuration parameters for NCA logging. /etc/nca/nca.if Lists the physical interfaces on which NCA will run. /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.


See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWncar (32-bit) | |_____________________________|_____________________________| | | SUNWncarx (64-bit) | |_____________________________|_____________________________| | Interface Stability | Evolving | |_____________________________|_____________________________|


ncab2clf(1), ncakmod(1), close(2), read(2), write(2), accept(3SOCKET), bind(3SOCKET)connect(3SOCKET), door_bind(3DOOR), door_call(3DOOR), door_create(3DOOR), getsockopt(3SOCKET), listen(3SOCKET), setsockopt(3SOCKET), shutdown(3SOCKET), socket(3HEAD), socket(3SOCKET), sendfilev(3EXT),ncad_addr(4), nca.if(4), ncakmod.conf(4), ncalogd.conf(4), attributes(5) System Administration Guide, Volume 3 SunOS 5.8 Last change: 28 Sep 2001 2