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Running a script on multiple machines
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nca(1) nca(1) NAME
nca, snca - the Solaris Network Cache and Accelerator (NCA) The Solaris Network Cache and Accelerator ("NCA") is a kernel module designed to provide improved web server performance. The kernel mod- ule, 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 pro- tocol 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 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 convert the log from a binary format to the Common Log File format. /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 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/host- name.{}{0-9} for NCA to function. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWncar (32-bit) | +-----------------------------+-----------------------------+ | |SUNWncarx (64-bit) | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ ncab2clf(1), ncakmod(1), close(2), read(2), write(2), sendfilev(3EXT), accept(3SOCKET), bind(3SOCKET)connect(3SOCKET), door_bind(3DOOR), door_call(3DOOR), door_create(3DOOR), getsockopt(3SOCKET), listen(3SOCKET), setsockopt(3SOCKET), shutdown(3SOCKET), socket.h(3HEAD), socket(3SOCKET), ncad_addr(4), nca.if(4), ncakmod.conf(4), ncaport.conf(4), ncalogd.conf(4), attributes(5) 22 Feb 2005 nca(1)
Running a script on multiple machines