1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
<html>
<head>
<title>svlogd(8) manual page</title>
</head>
<body bgcolor='white'>
<a href='http://smarden.org/pape/'>G. Pape</a><br><a href='index.html'>runit</A><hr><p>
<h2><a name='sect0'>Name</a></h2>
svlogd - runit’s service logging daemon
<h2><a name='sect1'>Synopsis</a></h2>
<b>svlogd</b> [-ttv] [-r <i>c]</i> [-R
<i>xyz]</i> [-l <i>n]</i> [-b <i>n]</i> <i>logs</i>
<h2><a name='sect2'>Description</a></h2>
<i>logs</i> consists of one or more arguments,
each specifying a directory. <p>
<b>svlogd</b> continuously reads log data from its
standard input, optionally filters log messages, and writes the data to
one or more automatically rotated <i>logs</i>. <p>
Recent log files can automatically
be processed by an arbitrary processor program when they are rotated, and
<b>svlogd</b> can be told to alert selected log messages to standard error. <p>
<b>svlogd</b>
runs until it sees end-of-file on standard input or is sent a TERM signal,
see below.
<h3><a name='sect3'>Log Directory</a></h3>
A log directory <i>log</i> contains some number of old
log files, and the current log file <i>current</i>. Old log files have a file name
starting with <i>@</i> followed by a precise timestamp (see <i><b>tai64n</b>(8)</i>), indicating
when <i>current</i> was rotated and renamed to this file. <p>
A log directory additionally
contains the lock file <i>lock</i>, maybe <i>state</i> and <i>newstate</i>, and optionally the
file <i>config</i>. <b>svlogd</b> creates necessary files if they don’t exist. <p>
If <b>svlogd</b>
has trouble opening a log directory, it prints a warning, and ignores this
log directory. If <b>svlogd</b> is unable to open all log directories given at
the command line, it exits with an error. This can happen on start-up or
after receiving a HUP signal.
<h3><a name='sect4'>Log File Rotation</a></h3>
<b>svlogd</b> appends selected log
messages to the <i>current</i> log file. If <i>current</i> has <i>size</i> bytes or more size
(or there is a new-line within the last <i>len</i> of <i>size</i> bytes) <i>current</i> is rotated:
<p>
<b>svlogd</b> closes <i>current</i>, changes permission of <i>current</i> to 0755, renames <i>current</i>
to @<i>timestamp.s,</i> and starts with a new empty <i>current</i>. If <b>svlogd</b> sees <i>num</i>
or more old log files in <i>dir</i>, it removes the oldest.
<h3><a name='sect5'>Processor</a></h3>
If <b>svlogd</b>
is told to process recent log files, it saves <i>current</i> to @<i>timestamp.u,</i> feeds
@<i>timestamp.u</i> through ‘‘sh -c "<i>processor</i>"’’ and writes the output to @<i>timestamp.t.</i>
If the <i>processor</i> finishes successfully, @<i>timestamp.u</i> is deleted and @<i>timestamp.t</i>
is renamed to @<i>timestamp.s,</i> otherwise @<i>timestamp.t</i> is deleted and the <i>processor</i>
is started again. <b>svlogd</b> also saves any output that the <i>processor</i> writes
to file descriptor 5, and make that output available on file descriptor
4 when it runs <i>processor</i> on the next log file rotation. <p>
A <i>processor</i> is run
in the background. If <b>svlogd</b> sees a previously started <i>processor</i> still running
when trying to start a new one for the same <i>log</i>, it blocks until the currently
running <i>processor</i> has finished successfully. Only the HUP signal works in
that situation. Note that this may block any program feeding its log data
to <b>svlogd.</b>
<p>
<h3><a name='sect6'>Config</a></h3>
On startup, and after receiving a HUP signal, <b>svlogd</b> checks
for each <i>log</i> if the configuration file <i>log/config</i> exists, and if so, reads
the file line by line and adjusts configuration for <i>log</i> as follows: <p>
If
the line is empty, less than two characters long, or starts with a ‘‘#’’, it
is ignored. A line of the form
<dl>
<dt>s<i>size</i> </dt>
<dd>sets the maximum file size of <i>current</i>
when <b>svlogd</b> should rotate the current log file to <i>size</i> bytes. Default is
1000000. If <i>size</i> is zero, <b>svlogd</b> doesn’t rotate log files. You should set
<i>size</i> to at least (2 * <i>len</i>). </dd>
<dt>n<i>num</i> </dt>
<dd>sets the maximum number of old log files
<b>svlogd</b> should maintain to <i>num</i>. If <b>svlogd</b> sees more that <i>num</i> old log files
in <i>log</i> after log file rotation, it deletes the oldest one. Default is 10.
</dd>
<dt>!<i>processor</i> </dt>
<dd>tells <b>svlogd</b> to feed each recent log file through <i>processor</i>
(see above) on log file rotation. By default log files are not processed.
</dd>
<dt>u<i>a.b.c.d[:port]</i> </dt>
<dd>tells <b>svlogd</b> to transmit the first <i>len</i> characters of selected
log messages to the IP address <i>a.b.c.d</i>, port number <i>port</i>. If <i>port</i> isn’t set,
the default port for syslog is used (514). <i>len</i> can be set through the -l
option, see below. If <b>svlogd</b> has trouble sending udp packets, it writes
error messages to the log directory. Attention: logging through udp is unreliable,
and should be used in private networks only. </dd>
<dt>U<i>a.b.c.d[:port]</i> </dt>
<dd>is the same as
the <i>u</i> line above, but the log messages are no longer written to the log
directory, but transmitted through udp only. Error messages from <b>svlogd</b>
concerning sending udp packages still go to the log directory. </dd>
</dl>
<p>
If a line
starts with a <i>-</i>, <i>+</i>, <i>e</i>, or <i>E</i>, <b>svlogd</b> matches the first <i>len</i> characters of
each log message against <i>pattern</i> and acts accordingly:
<dl>
<dt>-<i>pattern</i> </dt>
<dd>the log
message is deselected. </dd>
<dt>+<i>pattern</i> </dt>
<dd>the log message is selected </dd>
<dt>e<i>pattern</i> </dt>
<dd>log
messages matching <i>pattern</i> are printed to standard error. </dd>
<dt>E<i>pattern</i> </dt>
<dd>log messages
not matching <i>pattern</i> are printed to standard error. </dd>
</dl>
<p>
Initially each line
is selected. Deselected log messages are discarded from <i>log</i>.
<h2><a name='sect7'>Pattern Matching</a></h2>
<b>svlogd</b>
matches a log message against the string <i>pattern</i> as follows: <p>
<i>pattern</i> is
applied to the log message one character by one, starting with the first.
A character not a star (‘‘*’’) and not a plus (‘‘+’’) matches itself. A plus matches
the next character in <i>pattern</i> in the log message one or more times. A star
before the end of <i>pattern</i> matches any string in the log message that does
not include the next character in <i>pattern</i>. A star at the end of <i>pattern</i>
matches any string.
<h2><a name='sect8'>Options</a></h2>
<dl>
<dt><b>-t</b> </dt>
<dd>timestamp. Prefix each selected line with a
precise timestamp (see <i><b>tai64n</b>(8)</i>) when writing to <i>log</i> or to standard error.
</dd>
<dt><b>-tt</b> </dt>
<dd>timestamp. Prefix each selected line with a human readable, sortable
UTC timestamp of the form YYYY-MM-DD_HH:MM:SS.xxxxx when writing to <i>log</i> or
to standard error. </dd>
<dt><b>-r <i>c</b> </i></dt>
<dd>replace. <i>c</i> must be a single character. Replace non-printable
characters in log messages with <i>c</i>. Characters are replaced before pattern
matching is applied. </dd>
<dt><b>-R <i>xyz</b> </i></dt>
<dd>replace charset. Additionally to non-printable
characters, replace all characters found in <i>xyz</i> with <i>c</i> (default ‘‘_’’). </dd>
<dt><b>-l <i>len</b>
</i></dt>
<dd>line length. Pattern matching applies to the first <i>len</i> characters of a log
message only. Default is 1000. </dd>
<dt><b>-b <i>buflen</b> </i></dt>
<dd>buffer size. Set the size of the buffer
<b>svlogd</b> uses when reading from standard input and writing to <i>logs</i> to <i>buflen</i>.
Default is 1024. <i>buflen</i> must be greater than <i>len</i>. </dd>
<dt><b>-v</b> </dt>
<dd>verbose. Print verbose
messages to standard error. </dd>
</dl>
<h2><a name='sect9'>Signals</a></h2>
If <b>svlogd</b> is sent a HUP signal, it closes
and reopens all <i>logs</i>, and updates their configuration according to <i>log/config</i>.
If <b>svlogd</b> has trouble opening a log directory, it prints a warning, and
discards this log directory. If <b>svlogd</b> is unable to open all log directories
given at the command line, it exits with an error. <p>
If <b>svlogd</b> is sent a TERM
signal, or if it sees end-of-file on standard input, it stops reading standard
input, processes the data in the buffer, waits for all <i>processor</i> subprocesses
to finish if any, and exits 0 as soon as possible. <p>
If <b>svlogd</b> is sent an
ALRM signal, it forces log file rotation for all <i>logs</i> with a non empty
<i>current</i> log file.
<h2><a name='sect10'>See Also</a></h2>
<i>runsv(8)</i>, <i>runsvstat(8)</i>, <i>runsvctrl(8)</i>, <i>runsvdir(8)</i>,
<i>runsvchdir(8)</i>, <i>runit(8)</i>, <i>runit-init(8)</i>, <i>multilog(8)</i> <p>
<i>http://smarden.org/runit/</i>
<h2><a name='sect11'>Author</a></h2>
Gerrit Pape <pape@smarden.org> <p>
<hr><p>
<a name='toc'><b>Table of Contents</b></a><p>
<ul>
<li><a name='toc0' href='#sect0'>Name</a></li>
<li><a name='toc1' href='#sect1'>Synopsis</a></li>
<li><a name='toc2' href='#sect2'>Description</a></li>
<ul>
<li><a name='toc3' href='#sect3'>Log Directory</a></li>
<li><a name='toc4' href='#sect4'>Log File Rotation</a></li>
<li><a name='toc5' href='#sect5'>Processor</a></li>
<li><a name='toc6' href='#sect6'>Config</a></li>
</ul>
<li><a name='toc7' href='#sect7'>Pattern Matching</a></li>
<li><a name='toc8' href='#sect8'>Options</a></li>
<li><a name='toc9' href='#sect9'>Signals</a></li>
<li><a name='toc10' href='#sect10'>See Also</a></li>
<li><a name='toc11' href='#sect11'>Author</a></li>
</ul>
</body>
</html>
|
