PENCTL(1) General Commands Manual PENCTL(1)
NAME
penctl - control a running pen load balancer
SYNOPSIS
penctl host:port command
EXAMPLE
penctl lbhost:8888 roundrobin
Turns off client tracking on the load balancer running on lbhost.
DESCRIPTION
Penctl connects to the optional control socket on a pen load balancer. It reads commands from the command line, performs minimal syntax
checking and sends them to pen. Replies, if any, are printed on stdout.
The program can also be used through the cgi script penctl.cgi, which allows pen to be controlled from any web browser.
OPTIONS
host:port
Specifies a control port where the load balancer listens for commands.
COMMANDS
acl N permit|deny sourceip [mask]
Adds an entry to access list N, where N is a number from 0 to 9. The source and mask addresses are in the usual dotted quad nota-
tion. If mask is omitted, it defaults to 255.255.255.255.
no acl N
Deletes all entries from access list N. The resulting access list permits all traffic.
ascii Communication dumps in ascii format (cf option -a).
no ascii
Communication dumps in hex format.
blacklist
Return current blacklist time in seconds.
blacklist T
Set the blacklist time in seconds.
block Do not make sockets nonblocking.
no block
Make sockets nonblocking.
client_acl N
Check connecting clients against access list N (default 0).
clients_max
Return max number of clients.
conn_max
Return max number of simultaneous connections.
control
Return address and port where pen listens for control connections.
control_acl
Check accesses to the control port against access list N (default 0).
debug Return current debug level.
debug N
Set debug level to N.
delayed_forward
Always wait for the next round of the main loop before forwarding data. Normally pen tries to do that immediately.
no delayed_forward
Try to forward data immediately, to avoid the overhead of copying it to a temporary buffer and waiting for the next main loop round.
exit Exit. Only available if pen was started with the -X option.
hash Use a hash on the client IP address for initial server selection.
no hash
Do not use a hash.
http Add X-Forwarded-For headers to http requests.
no http
Do not add X-Forwarded-For headers.
include FILE
Read commands from file.
listen Return local address and port pen listens to for incoming client connections.
log Show where pen is logging, if anywhere.
log FILE
Log to FILE.
mode Write a summary of the current mode of operation. The listed modes are block, delayed_forward, hash, roundrobin, stubborn.
no log Turn off logging.
pid Return the process id of the running daemon
prio Use the priority based algorithm.
no prio
Do not use the priority based algorithm.
recent [N]
Shows which clients have connected in the last N seconds (default 300).
roundrobin
Use round-robin server selection without client tracking
no roundrobin
server N [ acl A |address A | port P | max M | hard H | blacklist T | weight W | prio P ]
Change acl, address, port, weight, priority and/or max connections for server N, or blacklist it for T seconds.
servers
List address, port, weight, priority and max number of simultaneous connections for each remote server.
status Print status information in html format.
stubborn
If the initial server selection is unavailable, close the client connection without trying another
no stubborn
timeout
Return current connect timeout in seconds.
timeout N
Set connect timeout to N seconds.
tracking N
Set tracking time, i.e. how long clients will be remembered. The default 0 will never expire clients based on time.
web_stats
Return file name of html status reports, if any.
web_stats FILE
Set the name of html status reports.
no web_stats
Do not generate html status reports.
weight Use weight for server selection.
no weight
Do not use weight for server selection.
write [FILE]
Write the current configuration into a file which can be used to start pen. If FILE is omitted, the configuration is written into
pen's original configuration file.
SEE ALSO
pen(1)
AUTHOR
Copyright (C) 2002-2008 Ulric Eriksson, <ulric@siag.nu>.
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