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Krzysztof Piotr Oledzki 2c6962c3c0 [MAJOR] proto_uxst rework -> SNMP support 
Currently there is a ~16KB limit for a data size passed via unix socket.
It is caused by a trivial bug ttat is going to fixed soon, however
in most cases there is no need to dump a full stats.

This patch makes possible to select a scope of dumped data by extending
current "show stat" to "show stat [<iid> <type> <sid>]":
 - iid is a proxy id, -1 to dump all proxies
 - type selects type of dumpable objects: 1 for frontend, 2 for backend, 4 for
   server, -1 for all types. Values can be ORed, for example:
     1+2=3   -> frontend+backend.
     1+2+4=7 -> frontend+backend+server.
 - sid is a service id, -1 to dump everything from the selected proxy.

To do this I implemented a new session flag (SN_STAT_BOUND), added three
variables in data_ctx.stats (iid, type, sid), modified dumpstats.c and
completely revorked the process_uxst_stats: now it waits for a "\n"
terminated string, splits args and uses them. BTW: It should be quite easy
to add new commands, for example to enable/disable servers, the only problem
I can see is a not very lucky config name (*stats* socket). :|

During the work I also fixed two bug:
 - s->flags were not initialized for proto_uxst
 - missing comma if throttling not enabled (caused by a stupid change in
     "Implement persistent id for proxies and servers")

Other changes:
 - No more magic type valuse, use STATS_TYPE_FE/STATS_TYPE_BE/STATS_TYPE_SV
 - Don't memset full s->data_ctx (it was clearing s->data_ctx.stats.{iid/type/sid},
    instead initialize stats.sv & stats.sv_st (stats.px and stats.px_st were already
    initialized)

With all that changes it was extremely easy to write a short perl plugin
for a perl-enabled net-snmp (also included in this patch).

29385 is my PEN (Private Enterprise Number) and I'm willing to donate
the SNMPv2-SMI::enterprises.29385.106.* OIDs for HAProxy if there
is nothing assigned already.
2008-03-04 06:32:16 +01:00
..
haproxy_backend.xml [MAJOR] proto_uxst rework -> SNMP support 2008-03-04 06:32:16 +01:00
haproxy_frontend.xml [MAJOR] proto_uxst rework -> SNMP support 2008-03-04 06:32:16 +01:00
haproxy.pl [MAJOR] proto_uxst rework -> SNMP support 2008-03-04 06:32:16 +01:00
README [MAJOR] proto_uxst rework -> SNMP support 2008-03-04 06:32:16 +01:00

README 

SNMP support for HAProxy
Copyright 2007-2008 Krzysztof Piotr Oledzki <ole@ans.pl>

Root OID: 1.3.6.1.4.1.29385.106

Files:
 - README: this file
 - haproxy.pl: Net-SNMP embedded perl module
 - haproxy_backend.xml: Cacti snmp-query definition for backends
 - haproxy_frontend.xml: Cacti snmp-query definition for frontends

Install:
 cp haproxy.pl /etc/snmp/
 grep -q "disablePerl false" /etc/snmp/snmpd.conf || echo "disablePerl false" >> /etc/snmp/snmpd.conf
 echo "perl do '/etc/snmp/haproxy.pl';" >> /etc/snmp/snmpd.conf

Supported commands:
 - GET (snmpget, snmpbulkget): quite fast.
 - GETNEXT (snmpwalk, snmpbulkwalk): not so fast as requires to transfer
    and parse a lot of data during each step. Always use "get" instead of "walk"
    if that's possible.

Supported OIDs:
 - 1.3.6.1.4.1.29385.106.1: get a variable from stats
    Usage: 1.3.6.1.4.1.29385.106.1.$type.$field.$iid.$sid

     - type is one of:
       0) frontend
       1) backend
       2) server

     - field is one of:
       0..32) CSV format variable
       10001) index
       10002) unique name

     - iid is a proxy id 

     - sid is a service id (sid): 0 for frontends and backends, >= 1 for servers

 - 1.3.6.1.4.1.29385.106.2: get a variable from info
    Usage: 1.3.6.1.4.1.29385.106.2.$req.$varnr

      - req is one of:
        0) get variable name
        1) gat variable value

Examples:

- Get a list of frontends (type: 0) with status (field: 17):
$ snmpbulkwalk -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.1.0.17
SNMPv2-SMI::enterprises.29385.106.1.0.17.1.0 = STRING: "OPEN"
SNMPv2-SMI::enterprises.29385.106.1.0.17.47.0 = STRING: "OPEN"

- Get a list of backends (type: 1) with index (field: 10001):
$ snmpbulkwalk -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.1.1.10001
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1.0 = STRING: "1.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1100.0 = STRING: "1100.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1101.0 = STRING: "1101.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1200.0 = STRING: "1200.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1201.0 = STRING: "1201.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1300.0 = STRING: "1300.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1400.0 = STRING: "1400.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1401.0 = STRING: "1401.0"
SNMPv2-SMI::enterprises.29385.106.1.1.10001.1500.0 = STRING: "1500.0"
(...)

- Get a list of servers (type: 2) with unique name (field: 10002):
$ snmpbulkwalk -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.1.2.10002
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1100.1001 = STRING: "backend1/s2"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1100.1002 = STRING: "backend1/s5"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1100.1003 = STRING: "backend1/s6"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1100.1012 = STRING: "backend1/s7"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1101.1001 = STRING: "backend2/s9"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1101.1002 = STRING: "backend2/s10"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1101.1003 = STRING: "backend2/s11"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1101.1012 = STRING: "backend2/s12"
SNMPv2-SMI::enterprises.29385.106.1.2.10002.1200.1001 = STRING: "backend3/s8"
(...)

- Get a list of servers (type: 2) with weight (field: 18) in proxy 4300:
$ snmpbulkwalk -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.1.2.18.4300
SNMPv2-SMI::enterprises.29385.106.1.2.18.4300.1001 = STRING: "40"
SNMPv2-SMI::enterprises.29385.106.1.2.18.4300.1002 = STRING: "25"
SNMPv2-SMI::enterprises.29385.106.1.2.18.4300.1003 = STRING: "40"
SNMPv2-SMI::enterprises.29385.106.1.2.18.4300.1012 = STRING: "80"

- Get total sessions count (field: 7) in frontend (type: 1), sid.iid: 47.0 (proxy #47):
snmpget -c public -v2c 192.168.0.1 enterprises.29385.106.1.0.7.47.0
SNMPv2-SMI::enterprises.29385.106.1.0.7.47.0 = STRING: "1014019"

- Get a list of available variables (req: 0):
$ snmpbulkwalk -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.2.0
SNMPv2-SMI::enterprises.29385.106.2.0.0 = STRING: "Name"
SNMPv2-SMI::enterprises.29385.106.2.0.1 = STRING: "Version"
SNMPv2-SMI::enterprises.29385.106.2.0.2 = STRING: "Release_date"
SNMPv2-SMI::enterprises.29385.106.2.0.3 = STRING: "Nbproc"
SNMPv2-SMI::enterprises.29385.106.2.0.4 = STRING: "Process_num"
SNMPv2-SMI::enterprises.29385.106.2.0.5 = STRING: "Pid"
SNMPv2-SMI::enterprises.29385.106.2.0.6 = STRING: "Uptime"
SNMPv2-SMI::enterprises.29385.106.2.0.7 = STRING: "Uptime_sec"
SNMPv2-SMI::enterprises.29385.106.2.0.8 = STRING: "Memmax_MB"
SNMPv2-SMI::enterprises.29385.106.2.0.9 = STRING: "Ulimit-n"
SNMPv2-SMI::enterprises.29385.106.2.0.10 = STRING: "Maxsock"
SNMPv2-SMI::enterprises.29385.106.2.0.11 = STRING: "Maxconn"
SNMPv2-SMI::enterprises.29385.106.2.0.12 = STRING: "CurrConns"

- Get a variable (req: 1), varnr: 7 (Uptime_sec):
$ snmpget -c public -v2c 192.168.0.1 1.3.6.1.4.1.29385.106.2.1.7
SNMPv2-SMI::enterprises.29385.106.2.1.7 = STRING: "18761"