By Giri Mandalika-Oracle on May 27, 2011
For the impatient:
For the rest:
A little background first.
PeopleSoft application server relies on Jolt, a companion product that co-exists with Tuxedo, to handle all web requests. That is, Jolt is the bridge between PeopleSoft application server and the web server (any supported one) that facilitates web communication. Tuxedo helps schedule PeopleSoft application server processes to perform the actual transactions. When the application server is booted up, Jolt server listener (JSL) is bound to a pre-configured port number and is actively monitored for incoming web requests. On the other hand, web server instance(s) are made aware of the existence of all Jolt listeners in a PeopleSoft Enterprise by configuring the hostname:port# pairs in each of the web domain's configuration.properties file.
By default the variable %PS_MACH% in each of the application server domain configuration file, psappsrv.cfg, gets resolved to the hostname of the system during application server boot-up time. The following example demonstrates that.
/* Application server configuration file */ % cat psappsrv.cfg .. [JOLT Listener] Address=%PS_MACH% Port=9000 .. /* Boot up the application server domain */ % psadmin -c boot -d HRHX .. exec JSL -A -- -d /dev/tcp -n //ben01:9000 -m 100 -M 100 -I 5 -j ANY -x 20 -S 10 -c 1000000 -w JSH : process id=20077 ... Started. .. % hostname ben01 % netstat -a | grep 9000 ben01.9000 *.* 0 0 49152 0 LISTEN % netstat -an | grep 9000 184.108.40.206.9000 *.* 0 0 49152 0 LISTEN % ifconfig -a lo0: flags=2001000849
mtu 8232 index 1 inet 127.0.0.1 netmask ff000000 bge0: flags=1000843 mtu 1500 index 2 inet 220.127.116.11 netmask ffffff00 broadcast 18.104.22.168 bge1: flags=1000843 mtu 1500 index 3 inet 22.214.171.124 netmask ffffff00 broadcast 126.96.36.199 e1000g0: flags=1000843 mtu 1500 index 4 inet 188.8.131.52 netmask ffffff00 broadcast 184.108.40.206 % telnet 220.127.116.11 9000 Trying 18.104.22.168... Connected to 22.214.171.124. Escape character is '^]'. % telnet 126.96.36.199 9000 Trying 188.8.131.52... telnet: Unable to connect to remote host: Connection refused % telnet 184.108.40.206 9000 Trying 220.127.116.11... telnet: Unable to connect to remote host: Connection refused
Notice that %PS_MACH% was replaced by the actual hostname and the Jolt listener created the server socket using the IP address 18.104.22.168 and port number 9000. From the outputs of netstat, ifconfig and telnet, it is apparent that "bge0" is the only network interface that is being used by the Jolt listener. It means web server can communicate to JSL using the IP address 22.214.171.124 over port 9000 but not using any of the other two IP addresses 126.96.36.199 or 188.8.131.52. This is the default behavior.
However some customers may wish to have the ability to connect to the application services from different/multiple networks. This is possible in case of multi-homed systems -- servers with multiple network interfaces that are connected to a single or multiple networks. For example, such a host could be part of a public network, a private network where only those clients that can communicate over private links can connect or an InfiniBand network, a low latency high throughput network. The default behavior of JSL can be changed by using a special IP address "0.0.0.0" in place of the variable %PS_MACH% in application server domains' configuration file. The IP address 0.0.0.0 hints the Jolt listener (JSL) to listen on all available IPv4 network interfaces on the system. (I read somewhere that "::0" is the equivalent for IPv6 interfaces. Didn't get a chance to test it out yet). The following example demonstrates how the default behavior changes with the IP address 0.0.0.0.
% cat psappsrv.cfg .. [JOLT Listener] Address=0.0.0.0 Port=9000 .. /* Update the binary configuration by reloading the config file */ % psadmin -c configure -d HRHX % psadmin -c boot -d HRHX .. exec JSL -A -- -d /dev/tcp -n //0.0.0.0:9000 -m 100 -M 100 -I 5 -j ANY -x 20 -S 10 -c 1000000 -w JSH : process id=20874 ... Started. % netstat -a | grep 9000 *.9000 *.* 0 0 49152 0 LISTEN % telnet 184.108.40.206 9000 Trying 220.127.116.11... Connected to 18.104.22.168. .. % telnet 22.214.171.124 9000 Trying 126.96.36.199... Connected to 188.8.131.52. .. % telnet 184.108.40.206 9000 Trying 220.127.116.11... Connected to 18.104.22.168.