symon/symon/symux/symux.8

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.Dd August 8, 2004
.Dt SYMUX 8
.Os
.Sh NAME
.Nm symux
.Nd symon stream multiplexer
.Sh SYNOPSIS
.Nm
.Op Fl dlv
.Op Fl f Ar filename
.Pp
.Sh DESCRIPTION
.Xr symon 8
is a lightweight system monitor that measures cpu, memory, mbuf, debug,
process, interface and disk statistics every 5 seconds. This information
is then spooled to
.Nm
for further processing.
.Pp
.Xr symon 8
has been designed to inflict minimal performance and security impact on
the system it monitors.
.Nm
has performance impact proportional to the amount of streams it needs to
manage. Ideally
.Nm
should live on a different system and collect data from several
.Xr symon 8
instances in a LAN.
.Nm
stores the incoming streams in .rrd files and distributes the
information to connected listeners. Listeners can connect to
.Nm
on a tcp port and receive incoming
.Xr symon 8
transmissions decoded into ascii.
.Lp
.Nm
needs no specific privileges besides being able to open it's ports and
the rrd files. It should be run as
.Ar "nobody" .
.Lp
The options:
.Bl -tag -width Ds
.It Fl d
Stop
.Nm
from becoming a daemon and show debug information on stdout. Use this setting
to find hosts or specific statistics that do get sent, but are ignored due to
configuration.
.It Fl f Ar filename
Read configuration from
.Ar filename
instead of
.Pa /etc/symux.conf .
.It Fl l
List rrd files found in active configuration.
.It Fl v
Show version.
.El
.Sh CONFIGURATION
.Nm
obtains configuration data from
.Pa /etc/symux.conf .
The configuration file contains one mux stanza that defines on what host
address and port
.Nm
should listen to for incoming monitored data. There is a source section
for every host that is to be monitored. The source section defines what
data to accept and where to write that data to. In the case that a
source is of another address family than the mux stanza, i.e. source =
ipv6 with mux = ipv4, a listen port of the sources' family is opened
using the unspecified address. Whitespace, newlines and text behind '#'
are ignored. The format in BNF:
.Pp
.nf
stmt         = mux-stmt | source-stmt
mux-stmt     = "mux" host [ port ]
host         = ip4addr | ip6addr | hostname
port         = [ "port" | "," ] portnumber
source-stmt  = "source" host "{"
               accept-stmts
               [ write-stmts ]
               [ datadir-stmt ] "}"
accept-stmts = accept-stmt [accept-stmts]
accept-stmt  = "accept" "{" resources "}"
resources    = resource version ["(" argument ")"]
               [ ","|" " resources ]
resource     = "cpu" | "mem" | "if" | "io" | "pf" | "pfq" |
               "debug" | "proc" | "mbuf" | "sensor" | "df"
version      = "" | number
argument     = number | interfacename | diskname
datadir-stmt = "datadir" dirname
write-stmts  = write-stmt [write-stmts]
write-stmt   = "write" resource "in" filename
.fi
.Pp
Note that
.Bl -tag -width Ds
.It Va port
in the
.Va mux-stmt
specifies the port-number for both the udp port (incoming
.Xr symon 8
traffic) and the tcp port for incoming listeners.
.It Va version
is needed to distinguish between the same type of information (i.e.
.Va io
) coming from different versions of OpenBSD. If no version number is
supplied, the latest will be assumed.
.It Va datadir
will guess filenames for all accepted streams.
.Va write
statements always take precendence over a
.Va datadir
statement.
.El
.Sh EXAMPLE
Here is an example
.Ar symux.conf
that listens to udp port 2100 on lo0, and accepts cpu, memory, pf,
interfaces xl0/de0/lo0/wi0, disks wd[0-3]/cd[0-1], disk free blocks
of three partition streams from a
.Xr symon 8
on localhost.
.Nm
will also listen on tcp port 2100 for incoming listeners.
.Pp
.nf
mux 127.0.0.1 2100
source 127.0.0.1 {
    accept { cpu(0), mem, pf,
	     if(xl0), if(de0),
	     if(lo0), if(wi0),
	     io(wd0), io(wd1), io(wd2),
	     io(wd3), io(cd0), io(cd1),
	     df(sd0a), df(sd0d), df(sd0e) }

    datadir "/var/www/symon/rrds/localhost"
}
.fi
.Sh LISTENERS
.Nm
offers received
.Xr symon 8
data to other programs via tcp. An example of a listener session:
.Pp
.nf
nexus:~/project/symon$ telnet 10.0.0.1 2100
Trying 10.0.0.1...
Connected to 10.0.0.1.
Escape character is '^]'.

10.0.0.1;mem::1077662160:7630848:53850112:469417984:0:25600;cpu:0:
1077662160:0.00:0.00:0.30:0.20:99.50;io:wd0:1077662160:2074:12759:
0:30736384:131780608;
10.0.0.2;mbuf::1077658247:138:74:0:0:41:0:23:0:90:360:868352:25:0:
0:0;pf::1077658247:700930123:535398451:0:352:1107229:706391:119833
9:4:0:0:2:3:29:4109383:83291:83262:980325:0:1:6:0:0;mem::107765824
7:79155200:131956736:391430144:0:536739840;cpu:0:1077658247:0.50:0
.00:0.00:0.90:98.60;proc:httpd:1077658247:9:216:172:8:3:0.00:14999
552:0;if:lo0:1077658247:147104:147104:45868177:45868177:0:0:0:0:0:
0;if:xl0:1077658247:284267:452077:150620236:273265863:372:89478:0:
0:0:0;if:de0:1077658247:1813721:1197722:729054136:568900227:101:2:
0:0:198:0;

^]
telnet> close
Connection closed.
.fi
.Lp
The format is
.Va symon-version
:
.Va symon-host-ip
:
.Va stream-name
:
.Va stream-argument
:
.Va timestamp
:
.Va data
.Lp
Data formats:
.Bl -tag -width Ds
.It cpu
Time spent in ( user, nice, system, interrupt, idle ). Total time is 100, data
is offered with precision 2.
.It mem
Memory in ( real_active, real_total, free, swap_used, swap_total ). All values
are in bytes rounded of to page boundaries. Values are 32 bit unsigned integers.
.It if
Interface counters ( packets_in, packets_out, bytes_in, bytes_out,
multicasts_in, multicasts_out, errors_in, errors_out, collisions, drops
). Values are 32 bit unsigned integers.
.It io
Alias for io2. See below.
.It io1
Pre OpenBSD 3.5 io/disk counters ( total_transfers, total_seeks, total_bytes
). Values are 64 bit unsigned integers.
.It io2
Io/disk counters ( total_rxfer, total_wxfer, total_seeks, total_rbytes,
total_wbytes). Values are 64 bit unsigned integers.
.It pf
Packet filter statistics ( bytes_v4_in : bytes_v4_out : bytes_v6_in :
bytes_v6_out : packets_v4_in_pass : packets_v4_in_drop : packets_v4_out_pass :
packets_v4_out_drop : packets_v6_in_pass : packets_v6_in_drop :
packets_v6_out_pass : packets_v6_out_drop : states_entries : states_searches :
states_inserts : states_removals : counters_match : counters_badoffset :
counters_fragment : counters_short : counters_normalize : counters_memory
). Values are 64 bit unsigned integers.
.It debug
Kernel variables debug0 to debug19. ( debug0 : ... : debug19 ). Values are 32
bit unsigned integers.
.It proc
Process statistics ( number : uticks : sticks : iticks : cpusec : cpupct :
procsz : rsssz ).
.It mbuf
Mbuf statistics ( totmbufs : mt_data : mt_oobdata : mt_control :
mt_header : mt_ftable : mt_soname : mt_soopts : pgused : pgtotal :
totmem : totpct : m_drops : m_wait : m_drain ).
.It sensor
Single sensor measurement offered with 7.6 precision. Value depends on sensor
type.
.It pfq
pf/altq queue statistics ( sent_bytes : sent_packets : drop_bytes :
drop_packets ). Values are 64 bit unsigned integers.
.It df
Disk free statistics ( blocks : bfree : bavail : files :
ffree : synwrites : asyncwrites). Values are 64 bit unsigned integers.
.El
.Sh SIGNALS
.Bl -tag -width Ds
.It SIGHUP
Causes
.Nm
to read
.Pa /etc/symux.conf
or the file specified by the
.Fl f
flag.
.Nm
will keep the old configuration if errors occured during parsing of the
configuration file.
.El
.Sh FILES
.Bl -tag -width Ds
.It Pa /var/run/symux.pid
Contains the program id of the
.Nm
daemon.
.It Pa /etc/symux.conf
.Nm
system wide configuration file.
.El
.Sh LEGACY FORMATS
.Nm
supports symon(8) clients that send pre OpenBSD 3.5 disk
statistics. These streams should be identified as io1(<disk>) instead of
io(<disk>) in
.Pa /etc/symux.conf.
Note that symon(8) measures io1 or io2 depending on whether it was
compiled on a host that supports version 1 or 2.
.Pp
Because the structure of the incoming data has changed, the rrd files
concerning io need to change as well:
.Bl -tag -width Ds
.It Upgrading symux only
Move all
.Pa io_<disk>.rrd
files to
.Pa io1_<disk>.rrd.
Change the
.Nm
configuration file to accept and write io1.
.Pp
.It Upgrading hosts to OpenBSD 3.5 and updating symon(8)
create new
.Pa io_<disk>.rrd
files using c_smrrds.sh for the upgraded host. Both symon(8) and
.Nm
configuration files can be left untouched as their io statements will
now default to io2.
.El
.Pp
.Nm
will output what version of information it is offered by symon(8)s on
the network when started with the
.Va -d
flag.
.Pp
Note that although an io1 can be translated into an io2 using rrdtool
dump - vi dump - rrdtool restore, this is not recommended.
.Sh BUGS
.Nm
writes incoming data to rrd files "in process". An rrdupdate on a somewhat
stale rrdfile -- with the last data from quite some time in the past -- is a
very expensive operation. This can cause
.Nm
to lockup while rrdupdate is updating the rrd file.
.Nm
will be unresponsive during this process.
.Sh AUTHOR
Willem Dijkstra <wpd@xs4all.nl>. Daniel Hartmeier helped to port to big-endian
architectures. Matthew Gream helped to port symon to other BSD platforms.

Port contributors: Marc Balmer, Matthew Gream, Daniel Hartmeier, J. Martin
Petersen, Fredrik Soderblom and Harm Schotanus.
.Sh SEE ALSO
.Xr symon 8