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PENCTL(1) General Commands Manual PENCTL(1) NAME penctl - control a running pen load balancer SYNOPSIS penctl host:port|/path/to/socket command EXAMPLE penctl lbhost:8888 roundrobin Turns off client tracking on the load balancer running on lbhost. penctl /var/run/pen/tmp/ctrl status Prints status information in html format. DESCRIPTION Penctl connects to the optional control socket on a pen load balancer. It reads commands from the command line, performs minimal syntax check- ing 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 abort_on_error Call abort() when a fatal error is encountered. This will create a core file which allows further troubleshooting. Disabled by default. no abort_on_error Exit normally on fatal error with an error code which indicates failure. acl N permit|deny sourceip4 [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. acl N permit|deny sourceip6[/length] If the source address contains the character ':', the address is interpreted as IPv6. Unlike IPv4 access entries, a length is used to indicate the mask. If length is omitted, it defaults to 128. acl N permit|deny country NN If the source address is the special word "country", a two-let- ter country code can be used to restrict access to the load bal- ancer. For this to work, pen must be built with geoip support. 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. This is obsolete as of 0.26.0 and does nothing. no block Make sockets nonblocking. client_acl N Check connecting clients against access list N (default 0). clients_max [N] With argument, increase the maximum number of known clients. Re- turns max number of clients. close N Close connection N connection N Display some basic information about connection N. conn_max [N] With argument, increase the max number of simultaneous connec- tions. Returns max number. control Return address and port where pen listens for control connec- tions. control_acl N Check accesses to the control port against access list N (de- fault 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 forward- ing data. Normally pen tries to do that immediately. This is ob- solete as of 0.26.0 and does nothing. no delayed_forward Try to forward data immediately, to avoid the overhead of copy- ing it to a temporary buffer and waiting for the next main loop round. dsr_if IF Use IF as the interface for Direct Server Return. dummy Act as a dummy web server with very limited functionality but high performance. Only useful for testing. Disabled by default. no dummy Do not act as a dummy web server. epoll Use epoll for event management (Linux). This is the default on Linux. exit Exit. Only available if pen was started with the -X option. hash Use a hash on the client IP address for initial server selec- tion. 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. idle_timeout N Close connections that have been inactive for N seconds. Default 0 = never close. idlers [N] Create N reliable idle connections to the backend servers. With- out argument, display the current/requested number of reliable idlers. include FILE Read commands from file. kqueue Use kqueue for event management (FreeBSD, NetBSD, OpenBSD). This is the default on the systems that have it. listen Return local address and port pen listens to for incoming client connections. listen [address:]:port Close the listening socket and reopen using specified address (optional) and port. 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. pending_max N Max allowed number of pending nonblocking connections. Default 100, minimum 1. pid Return the process id of the running daemon. poll Use poll for event management. 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 (de- fault 300). roundrobin Use round-robin server selection without client tracking no roundrobin select Use select for event management. 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 connec- tions for server N, or blacklist it for T seconds. servers List address, port, weight, priority and max number of simulta- neous connections for each remote server. socket N Show to which connection socket N belongs. source IP Set the local address to IP for upstream connections, i.e. where Pen connects to backend servers. ssl_ciphers CIPHERS Choose list of available SSL ciphers, specified in the format described in https://www.openssl.org/docs/apps/ciphers.html. ssl_client_renegotiation_interval S Allowing the client to request renegotiation is a potential de- nial of service vector. This command specifies the minimum num- ber of seconds the client has to wait between requests for rene- gotiation requests. Default 3600 = effectively disabled. ssl_ocsp_response FILENAME Specifies the location of a file containing a pre-fetched OCSP response. The file must be refreshed regularly by a cron job or similar and the ssl_ocsp_response command repeated to make Pen re-read the file.. ssl_option OPTION Manipulate SSL options. The available options are no_sslv2, no_sslv3, no_tlsv1, no_tlsv1.1, no_tlsv1.2, cipher_server_pref- erence. Use the command multiple times to specify multiple op- tions. ssl_sni_path PATH This command enables the Server Name Indication TLS extension by specifying a directory where domain.key, domain.crt and do- main.ca files can be found. status Print status information in html format. stubborn If the initial server selection is unavailable, close the client connection without trying another no stubborn tarpit_acl [N] Used in DSR mode. If N is an existing access list, Pen will re- ply to ARP requests for IP addresses that match the access list, and reply with SYN+ACK to TCP SYN requests to these addresses. The result is that someone trying to scan a network will be slowed down by a large number of false positives. tcp_fastclose up|down|both|off Close both sockets to upstream and downstream if one of them closes theirs. Default = off. tcp_nodelay Set TCP_NODELAY on sockets, effectively turning off the Nagle algorithm. no tcp_nodelay Do not set TCP_NODELAY on sockets. This is the default. 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. transparent On compatible platforms, use the client's address as source ad- dress in the connection to the backend server. no transparent Use Pen's address as source address in the connection to the backend server. 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) 2002-2015 Ulric Eriksson, <ulric@siag.nu>. LOCAL PENCTL(1)
NAME | SYNOPSIS | EXAMPLE | DESCRIPTION | OPTIONS | COMMANDS | SEE ALSO | AUTHOR
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