Here are the legal global keywords:
Keyword Function
----------------------------------------------------------------
set daemon Set a background poll interval in seconds.
set init Set Monit to run from init. Monit will not
transform itself into a daemon process.
set logfile Name of a file to dump error- and status-
messages to. If syslog is specified as the
file, Monit will utilize the syslog daemon
to log messages. This can optionally be
followed by 'facility <facility>' where
facility is 'log_local0' - 'log_local7' or
'log_daemon'. If no facility is specified,
LOG_USER is used.
set mailserver The mailserver used for sending alert
notifications. If the mailserver is not
defined, Monit will try to use 'localhost'
as the smtp-server for sending mail. You
can add more mail servers, if Monit cannot
connect to the first server it will try the
next server and so on.
set mail-format Set a global mail format for all alert
messages emitted by monit.
set idfile Explicit set the location of the Monit id
file. E.g. set idfile /var/monit/id.
set pidfile Explicit set the location of the Monit lock
file. E.g. set pidfile /var/run/xyzmonit.pid.
set statefile Explicit set the location of the file Monit
will write state data to. If not set, the
default is $HOME/.monit.state.
set httpd port Activates Monit http server at the given
port number.ssl enable Enables ssl support for the httpd server.
Requires the use of the pemfile statement.
ssl disable Disables ssl support for the httpd server.
It is equal to omitting any ssl statement.
pemfile Set the pemfile to be used with ssl.
clientpemfile Set the pemfile to be used when client
certificates should be checked by monit.
address If specified, the http server will only
accept connect requests to this addresses
This statement is an optional part of the
set httpd statement.
allow Specifies a host or IP address allowed to
connect to the http server. Can also specify
a username and password allowed to connect
to the server. More than one allow statement
are allowed. This statement is also an
optional part of the set httpd statement.
read-only Set the user defined in username:password
to read only. A read-only user cannot change
a service from the Monit web interface.
include include a file or files matching the globstringHere are the legal service entry keywords:Keyword Function
----------------------------------------------------------------
check Starts an entry and must be followed by the type
of monitored service {filesystem|directory|file|host
process|system|program} and a descriptive name for
the service.
pidfile Specify the process pidfile. Every
process must create a pidfile with its
current process id. This statement should only
be used in a process service entry.
path Must be followed by a path to the block
special file for filesystem, regular
file, directory or a process's pidfile.
group Specify a groupname for a service entry.
start The program used to start the specified
service. Full path is required. This
statement is optional, but recommended.
stop The program used to stop the specified
service. Full path is required. This
statement is optional, but recommended.
pid and ppid These keywords may be used as standalone
statements in a process service entry to
override the alert action for change of
process pid and ppid.
uid and gid These keywords are either 1) an optional part of
a start, stop or exec statement. They may be
used to specify a user id and a group id the
program (process) should switch to upon start.
This feature can only be used if the superuser
is running monit. 2) uid and gid may also be
used as standalone statements in a file service
entry to test a file's uid and gid attributes.
host The hostname or IP address to test the port
at. This keyword can only be used together
with a port statement or in the check host
statement.
port Specify a TCP/IP service port number which
a process is listening on. This statement
is also optional. If this statement is not
prefixed with a host-statement, localhost is
used as the hostname to test the port at.
type Specifies the socket type Monit should use when
testing a connection to a port. If the type
keyword is omitted, tcp is used. This keyword
must be followed by either tcp, udp or tcpssl.
tcp Specifies that Monit should use a TCP
socket type (stream) when testing a port.
tcpssl Specifies that Monit should use a TCP socket
type (stream) and the secure socket layer (ssl)
when testing a port connection.
udp Specifies that Monit should use a UDP socket
type (datagram) when testing a port.
certmd5 The md5 sum of a certificate a ssl forged
server has to deliver.
proto(col) This keyword specifies the type of service
found at the port. See CONNECTION TESTING
for list of supported protocols.
You're welcome to write new protocol test
modules. If no protocol is specified Monit will
use a default test which in most cases are good
enough.
request Specifies a server request and must come
after the protocol keyword mentioned above.
- for http it can contain an URL and an
optional query string.
- other protocols does not support this
statement yet
send/expect These keywords specify a generic protocol.
Both require a string whether to be sent or
to be matched against (as extended regex if
supported). Send/expect can not be used
together with the proto(col) statement.
unix(socket) Specifies a Unix socket file and used like
the port statement above to test a Unix
domain network socket connection.
URL Specify an URL string which Monit will use for
connection testing.
content Optional sub-statement for the URL statement.
Specifies that Monit should test the content
returned by the server against a regular
expression.
timeout x sec. Define a network port connection timeout. Must
be followed by a number in seconds and the
keyword, seconds.
timeout Define a service timeout. Must be followed by
two digits. The first digit is max number of
restarts for the service. The second digit
is the cycle interval to test restarts.
This statement is optional.
alert Specifies an email address for notification
if a service event occurs. Alert can also
be postfixed, to only send a message for
certain events. See the examples above. More
than one alert statement is allowed in an
entry. This statement is also optional.
noalert Specifies an email address which don't want
to receive alerts. This statement is also
optional.
restart, stop These keywords may be used as actions for
unmonitor, various test statements. The exec statement is
start and special in that it requires a following string
exec specifying the program to be execute. You may
also specify an UID and GID for the exec
statement. The program executed will then run
using the specified user id and group id.
mail-format Specifies a mail format for an alert message
This statement is an optional part of the
alert statement.
checksum Specify that Monit should compute and monitor a
file's md5/sha1 checksum. May only be used in a
check file entry.
expect Specifies a md5/sha1 checksum string Monit
should expect when testing the checksum. This
statement is an optional part of the checksum
statement.
timestamp Specifies an expected timestamp for a file
or directory. More than one timestamp statement
are allowed. May only be used in a check file or
check directory entry.
changed Part of a timestamp statement and used as an
operator to simply test for a timestamp change.
every Validate this entry only at every n poll cycle
or per cron specification. Useful in daemon mode
when the cycle is short and a service takes some
time to start or to suppress monitoring during
backup windows.
mode Must be followed either by the keyword active,
passive or manual. If active, Monit will restart
the service if it is not running (this is the
default behavior). If passive, Monit will not
(re)start the service if it is not running - it
will only monitor and send alerts (resource
related restart and stop options are ignored
in this mode also). If manual, Monit will enter
active mode only if a service was started under
monit's control otherwise the service isn't
monitored.
cpu Must be followed by a compare operator, a number
with "%" and an action. This statement is used
to check the cpu usage in percent of a process
with its children over a number of cycles. If
the compare expression matches then the
specified action is executed.
mem The equivalent to the cpu token for memory of a
process (w/o children!). This token must be
followed by a compare operator a number with
unit {B|KB|MB|GB|%|byte|kilobyte|megabyte|
gigabyte|percent} and an action.
swap Token for system swap usage monitoring. This token
must be followed by a compare operator a number with
unit {B|KB|MB|GB|%|byte|kilobyte|megabyte|gigabyte|percent}
and an action.
loadavg Must be followed by [1min,5min,15min] in (), a
compare operator, a number and an action. This
statement is used to check the system load
average over a number of cycles. If the compare
expression matches then the specified action is
executed.
children This is the number of child processes spawn by a
process. The syntax is the same as above.
totalmem The equivalent of mem, except totalmem is an
aggregation of memory, not only used by a
process but also by all its child
processes. The syntax is the same as above.
space Must be followed by a compare operator, a
number, unit {B|KB|MB|GB|%|byte|kilobyte|
megabyte|gigabyte|percent} and an action.
inode(s) Must be followed by a compare operator, integer
number, optionally by percent sign (if not, the
limit is absolute) and an action.
perm(ission) Must be followed by an octal number describing
the permissions.
size Must be followed by a compare operator, a
number, unit {B|KB|MB|GB|byte|kilobyte|
megabyte|gigabyte} and an action.
uptime Must be followed by a compare operator, a
number, unit {second(s)|minute(s)|hour(s)|day(s)}
and an action.
depends (on) Must be followed by the name of a service this
service depends on.每一进程都有pid,存放在／var/run/monit.pid 这个文件里面会存放一个数值
CONFIGURATION EXAMPLES
The simplest form is just the check statement. In this example wecheck to see if the server is running and log a message if not:
check process resin with pidfile /usr/local/resin/srun.pid
Checking process without pidfile:
check process pager matching "/sbin/dynamic_pager -F /private/var/vm/swapfile"
To have Monit start the server if it's not running, add a startstatement:
check process resin with pidfile /usr/local/resin/srun.pid
start program = "/usr/local/resin/bin/srun.sh start"
stop program = "/usr/local/resin/bin/srun.sh stop"
Here's a more advanced example for monitoring an apacheweb-server listening on the default port number for HTTP andHTTPS. In this example Monit will restart apache if it's notaccepting connections at the port numbers. The method Monit usefor a process restart is to first execute the stop-program, waitup to 30s for the process to stop and then execute the start-programand wait up to 30s for it to start. The length of start or stoptimeout can be overridden using the 'timeout' option. If Monit wasunable to stop or start the service a failed alert message willbe sent if you have requested alert messages to be sent.
check process apache with pidfile /var/run/httpd.pid
start program = "/etc/init.d/httpd start" with timeout 60 seconds
stop program = "/etc/init.d/httpd stop"
if failed port 80 then restart
if failed port 443 with timeout 15 seconds then restart
This example demonstrate how you can run a program as a specifieduser (uid) and with a specified group (gid). Many daemon programswill do the uid and gid switch by them self, but for thoseprograms that does not (e.g. Java programs), monit's ability tostart a program as a certain user can be very useful. In thisexample we start the Tomcat Java Servlet Engine as the standardnobody user and group. Please note that Monit will only switchuid and gid for a program if the super-user is running monit,otherwise Monit will simply ignore the request to change uid andgid.
check process tomcat with pidfile /var/run/tomcat.pid
start program = "/etc/init.d/tomcat start"
as uid nobody and gid nobody
stop program = "/etc/init.d/tomcat stop"
# You can also use id numbers instead and write:
as uid 99 and with gid 99
if failed port 8080 then alert
In this example we use udp for connection testing to check if thename-server is running and also use timeout and alert:
check process named with pidfile /var/run/named.pid
start program = "/etc/init.d/named start"
stop program = "/etc/init.d/named stop"
if failed port 53 use type udp protocol dns then restart
if 3 restarts within 5 cycles then timeout
The following example illustrates how to check if the service'sophie' is answering connections on its Unix domain socket:
check process sophie with pidfile /var/run/sophie.pid
start program = "/etc/init.d/sophie start"
stop program = "/etc/init.d/sophie stop"
if failed unix /var/run/sophie then restart
In this example we check an apache web-server running onlocalhost that answers for several IP-based virtual hosts orvhosts, hence the host statement before port:
check process apache with pidfile /var/run/httpd.pid
start "/etc/init.d/httpd start"
stop "/etc/init.d/httpd stop"
if failed host www.sol.no port 80 then alert
if failed host shop.sol.no port 443 then alert
if failed host chat.sol.no port 80 then alert
if failed host www.tildeslash.com port 80 then alert
To make sure that Monit is communicating with a http server aprotocol test can be added:
check process apache with pidfile /var/run/httpd.pid
start "/etc/init.d/httpd start"
stop "/etc/init.d/httpd stop"
if failed host www.sol.no port 80
protocol HTTP
then alert
This example shows a different way to check a webserver usingthe send/expect mechanism:
check process apache with pidfile /var/run/httpd.pid
start "/etc/init.d/httpd start"
stop "/etc/init.d/httpd stop"
if failed host www.sol.no port 80
send "GET / HTTP/1.0\r\nHost: www.sol.no\r\n\r\n"
expect "HTTP/[0-9\.]{3} 200 .*\r\n"
then alert
To make sure that Apache is logging successfully (i.e. no more than 60 percent of child servers are logging), use its mod_statuspage at www.sol.no/server-status with this special protocol test:
check process apache with pidfile /var/run/httpd.pid
start "/etc/init.d/httpd start"
stop "/etc/init.d/httpd stop"
if failed host www.sol.no port 80
protocol apache-status loglimit > 60% then restart
This configuration can be used to alert you if 25 percent or moreof Apache child processes are stuck performing DNS lookups:
check process apache with pidfile /var/run/httpd.pid
start "/etc/init.d/httpd start"
stop "/etc/init.d/httpd stop"
if failed host www.sol.no port 80
protocol apache-status dnslimit > 25% then alert
Here we use an icmp ping test to check if a remote host is up andif not send an alert:
check host www.tildeslash.com with address www.tildeslash.com
if failed icmp type echo count 5 with timeout 15 seconds
then alert
In the following example we ask Monit to compute and verify thechecksum for the underlying apache binary used by the start andstop programs. If the the checksum test should fail, monitoringwill be disabled to prevent possibly starting a compromisedbinary:
check process apache with pidfile /var/run/httpd.pid
start program = "/etc/init.d/httpd start"
stop program = "/etc/init.d/httpd stop"
if failed host www.tildeslash.com port 80 then restart
depends on apache_bin
check file apache_bin with path /usr/local/apache/bin/httpd
if failed checksum then unmonitor
In this example we ask Monit to test the checksum for a documenton a remote server. If the checksum was changed we send an alert:
check host tildeslash with address www.tildeslash.com
if failed port 80 protocol http
and request "/monit/dist/monit-4.0.tar.gz"
with checksum f9d26b8393736b5dfad837bb13780786
then alert
Here are a couple of tests for some popular communicationservers, using the SIP protocol. First we test a FreeSWITCHserver and then an Asterisk server
check process freeswitch
with pidfile /usr/local/freeswitch/log/freeswitch.pid
start program = “/usr/local/freeswitch/bin/freeswitch -nc -hp”
stop program = “/usr/local/freeswitch/bin/freeswitch -stop”
if totalmem > 1000.0 MB for 5 cycles then alert
if totalmem > 1500.0 MB for 5 cycles then alert
if totalmem > 2000.0 MB for 5 cycles then restart
if cpu > 60% for 5 cycles then alert
if failed port 5060 type udp protocol SIP
target me@foo.bar and maxforward 10
then restart
if 5 restarts within 5 cycles then timeout
check process asterisk
with pidfile /var/run/asterisk/asterisk.pid
start program = “/usr/sbin/asterisk”
stop program = “/usr/sbin/asterisk -r -x ’shutdown now’”
if totalmem > 1000.0 MB for 5 cycles then alert
if totalmem > 1500.0 MB for 5 cycles then alert
if totalmem > 2000.0 MB for 5 cycles then restart
if cpu > 60% for 5 cycles then alert
if failed port 5060 type udp protocol SIP
and target me@foo.bar maxforward 10
then restart
if 5 restarts within 5 cycles then timeout
Some servers are slow starters, like for example Java basedApplication Servers. So if we want to keep the poll-cycle low(i.e. < 60 seconds) but allow some services to take its time tostart, the every statement is handy:
check process dynamo with pidfile /etc/dynamo.pid every 2 cycles
start program = "/etc/init.d/dynamo start"
stop program = "/etc/init.d/dynamo stop"
if failed port 8840 then alert
Here is an example where we group together two database entriesso you can manage them together, e.g.; 'Monit -g database startall'. The mode statement is also illustrated in the first entryand have the effect that Monit will not try to (re)start thisservice if it is not running:
check process sybase with pidfile /var/run/sybase.pid
start = "/etc/init.d/sybase start"
stop = "/etc/init.d/sybase stop"
mode passive
group database
check process oracle with pidfile /var/run/oracle.pid
start program = "/etc/init.d/oracle start"
stop program = "/etc/init.d/oracle stop"
mode active # Not necessary really, since it's the default
if failed port 9001 then restart
group database
Here is an example to show the usage of the resource checks. Itwill send an alert when the CPU usage of the http daemon and itschild processes raises beyond 60% for over two cycles. Apache isrestarted if the CPU usage is over 80% for five cycles or thememory usage over 100Mb for five cycles or if the machines loadaverage is more than 10 for 8 cycles:
check process apache with pidfile /var/run/httpd.pid
start program = "/etc/init.d/httpd start"
stop program = "/etc/init.d/httpd stop"
if cpu > 40% for 2 cycles then alert
if totalcpu > 60% for 2 cycles then alert
if totalcpu > 80% for 5 cycles then restart
if mem > 100 MB for 5 cycles then stop
if loadavg(5min) greater than 10.0 for 8 cycles then stop
This examples demonstrate the timestamp statement with exec andhow you may restart apache if its configuration file waschanged.
check file httpd.conf with path /etc/httpd/httpd.conf
if changed timestamp
then exec "/etc/init.d/httpd graceful"
In this example we demonstrate usage of the extended alertstatement and a file check dependency:
check process apache with pidfile /var/run/httpd.pid
start = "/etc/init.d/httpd start"
stop = "/etc/init.d/httpd stop"
alert admin@bar on {nonexist, timeout}
with mail-format {
from: bofh@$HOST
subject: apache $EVENT - $ACTION
message: This event occurred on $HOST at $DATE.
Your faithful employee,
monit
}
if failed host www.tildeslash.com port 80 then restart
if 3 restarts within 5 cycles then timeout
depend httpd_bin
group apache
check file httpd_bin with path /usr/local/apache/bin/httpd
alert security@bar on {checksum, timestamp,
permission, uid, gid}
with mail-format {subject: Alaaarrm! on $HOST}
if failed checksum
and expect 8f7f419955cefa0b33a2ba316cba3659
then unmonitor
if failed permission 755 then unmonitor
if failed uid root then unmonitor
if failed gid root then unmonitor
if changed timestamp then alert
group apache
In this example, we demonstrate usage of the depend statement. Inthis case, we want to start oracle and apache. However, we've setup apache to use oracle as a back end, and if oracle isrestarted, apache must be restarted as well.
check process apache with pidfile /var/run/httpd.pid
start = "/etc/init.d/httpd start"
stop = "/etc/init.d/httpd stop"
depends on oracle
check process oracle with pidfile /var/run/oracle.pid
start = "/etc/init.d/oracle start"
stop = "/etc/init.d/oracle stop"
if failed port 9001 then restart
Next, we have 2 services, oracle-import and oracle-export thatneed to be restarted if oracle is restarted, but are independentof each other.
check process oracle with pidfile /var/run/oracle.pid
start = "/etc/init.d/oracle start"
stop = "/etc/init.d/oracle stop"
if failed port 9001 then restart
check process oracle-import
with pidfile /var/run/oracle-import.pid
start = "/etc/init.d/oracle-import start"
stop = "/etc/init.d/oracle-import stop"
depends on oracle
check process oracle-export
with pidfile /var/run/oracle-export.pid
start = "/etc/init.d/oracle-export start"
stop = "/etc/init.d/oracle-export stop"
depends on oracle
Finally an example with all statements:
check process apache with pidfile /var/run/httpd.pid
start program = "/etc/init.d/httpd start"
stop program = "/etc/init.d/httpd stop"
if 3 restarts within 5 cycles then timeout
if failed host www.sol.no port 80 protocol http
and use the request "/login.cgi"
then alert
if failed host shop.sol.no port 443 type tcpssl
protocol http and with timeout 15 seconds
then restart
if cpu is greater than 60% for 2 cycles then alert
if cpu > 80% for 5 cycles then restart
if totalmem > 100 MB then stop
if children > 200 then alert
alert bofh@bar with mail-format {from: monit@foo.bar.no}
every 2 cycles
mode active
depends on weblogic
depends on httpd.pid
depends on httpd.conf
depends on httpd_bin
depends on datafs
group server
check file httpd.pid with path /usr/local/apache/logs/httpd.pid
group server
if timestamp > 7 days then restart
every 2 cycles
alert bofh@bar with mail-format {from: monit@foo.bar.no}
depends on datafs
check file httpd.conf with path /etc/httpd/httpd.conf
group server
if timestamp was changed
then exec "/usr/local/apache/bin/apachectl graceful"
every 2 cycles
alert bofh@bar with mail-format {from: monit@foo.bar.no}
depends on datafs
check file httpd_bin with path /usr/local/apache/bin/httpd
group server
if failed checksum and expect the sum
8f7f419955cefa0b33a2ba316cba3659 then unmonitor
if failed permission 755 then unmonitor
if failed uid root then unmonitor
if failed gid root then unmonitor
if changed size then alert
if changed timestamp then alert
every 2 cycles
alert bofh@bar with mail-format {from: monit@foo.bar.no}
alert foo@bar on { checksum, size, timestamp, uid, gid }
depends on datafs
check filesystem datafs with path /dev/sdb1
group server
start program = "/bin/mount /data"
stop program = "/bin/umount /data"
if failed permission 660 then unmonitor
if failed uid root then unmonitor
if failed gid disk then unmonitor
if space usage > 80 % then alert
if space usage > 94 % then stop
if inode usage > 80 % then alert
if inode usage > 94 % then stop
alert root@localhost
check host ftp.redhat.com with address ftp.redhat.com
if failed icmp type echo with timeout 15 seconds
then alert
if failed port 21 protocol ftp
then exec "/usr/X11R6/bin/xmessage -display
:0 ftp connection failed"
alert foo@bar.com check host www.gnu.org with address www.gnu.org
if failed port 80 protocol http
and request "/pub/gnu/bash/bash-2.05b.tar.gz"
with checksum 8f7f419955cefa0b33a2ba316cba3659
then alert
alert rms@gnu.org with mail-format {
subject: The gnu server may be hacked again! }