Using Ps-watcher to Monitor Processes
Ps-watcher can run ps periodically and match patterns based on the output of ps. You can check for memory usage, number of processes, etc. Let's grab the program and try to compile:
[root@test psw]# ls
ps-watcher-1.0.tar.gz
[root@test psw]# tar -xzf *.gz
[root@test psw]# cd ps*
[root@test ps-watcher-1.0]# ls
aclocal.m4 configure install-sh mkinstalldirs README touch.pl
AUTHORS configure.ac Makefile.am NEWS samples
ChangeLog COPYING Makefile.in post-configure.in tests
config.guess docs Makefile.PL ps-watcher THANKS
config.sub INSTALL missing ps-watcher.in.in TODO
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
checking whether make sets $(MAKE)... (cached) yes
checking for perl... /usr/bin/perl
checking for ps... /bin/ps
configure: creating ./config.status
config.status: creating Makefile
config.status: creating post-configure
config.status: creating docs/Makefile
config.status: creating tests/args.t
config.status: creating tests/basic.cnf
config.status: creating tests/basic.t
config.status: creating tests/count.t
config.status: creating tests/full.t
config.status: creating tests/Makefile
config.status: creating ps-watcher.in
config.status: executing default-1 commands
Checking for your version of Perl...5.006001
Checking to see that you have all library modules installed...
Sys::Syslog is installed
File::Basename is installed
Pod::Text is installed
Need package "Config::IniFiles": Can't locate Config/IniFiles.pm in @INC
(@INC contains: /usr/lib/perl5/5.6.1/i386-linux /usr/lib/perl5/5.6.1
/usr/lib/perl5/site_perl/5.6.1/i386-linux /usr/lib/perl5/site_perl/5.6.1
/usr/lib/perl5/site_perl/5.6.0/i386-linux /usr/lib/perl5/site_perl/5.6.0
/usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.6.1/i386-linux
/usr/lib/perl5/vendor_perl/5.6.1 /usr/lib/perl5/vendor_perl .) at
(eval 4) line 3.
[root@test ps-watcher-1.0]#
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Doh! Gotta install the IniFiles module. Let's find it and install:
root@test ps-watcher-1.0]# perl -MCPAN -e shell
/usr/lib/perl5/5.6.1/CPAN/Config.pm initialized.
CPAN is the world-wide archive of perl resources. It consists of about
100 sites that all replicate the same contents all around the globe.
Many countries have at least one CPAN site already. The resources
found on CPAN are easily accessible with the CPAN.pm module. If you
want to use CPAN.pm, you have to configure it properly.
If you do not want to enter a dialog now, you can answer 'no' to this
question and I'll try to autoconfigure. (Note: you can revisit this
dialog anytime later by typing 'o conf init' at the cpan prompt.)
Are you ready for manual configuration? [yes] no
.
.
.
commit: wrote /usr/lib/perl5/5.6.1/CPAN/Config.pm
cpan shell -- CPAN exploration and modules installation (v1.59_54)
ReadLine support available (try 'install Bundle::CPAN')
cpan>
cpan> i /IniFiles/
CPAN: Storable loaded ok
CPAN: LWP::UserAgent loaded ok
.
.
.
Distribution J/JV/JVBSOFT/Config-IniFiles-Import-1.000.tar.gz
Distribution W/WA/WADG/Config-IniFiles-2.38.tar.gz
Module Config::IniFiles (W/WA/WADG/Config-IniFiles-2.38.tar.gz)
Module Config::IniFiles::Import (J/JV/JVBSOFT/Config-IniFiles-Import-1.000.tar.gz)
4 items found
cpan>
cpan> install Config::IniFiles
Running install for module Config::IniFiles
Running make for W/WA/WADG/Config-IniFiles-2.38.tar.gz
Trying with "/usr/bin/lynx -source" to get
ftp://ftp.perl.org/pub/CPAN/authors/id/W/WA/WADG/Config-IniFiles-2.38.tar.gz
CPAN: MD5 security checks disabled because MD5 not installed.
Please consider installing the MD5 module.
Scanning cache /root/.cpan/build for sizes
Config-IniFiles-2.38/
Config-IniFiles-2.38/t/
.
.
.
t/06oo..............ok
t/07misc............ok, 1/4 skipped: unknown reason
All tests successful, 1 subtest skipped.
Files=8, Tests=83, 0 wallclock secs ( 0.57 cusr + 0.06 csys = 0.63 CPU)
/usr/bin/make test -- OK
Running make install
Installing /usr/lib/perl5/site_perl/5.6.1/Config/IniFiles.pm
Installing /usr/share/man/man3/Config::IniFiles.3pm
Writing /usr/lib/perl5/site_perl/5.6.1/i386-linux/auto/Config/IniFiles/.packlist
Appending installation info to /usr/lib/perl5/5.6.1/i386-linux/perllocal.pod
/usr/bin/make install -- OK
cpan>
cpan> exit
Lockfile removed.
[root@test ps-watcher-1.0]#
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Let's try again:
[root@test ps-watcher-1.0]# ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... gawk
.
.
.
Checking what to put after #! at the top of ps-watcher.../usr/bin/perl
Rewriting ps-watcher.in into ps-watcher...
./ps-watcher.stamp
All done. Now run "make"; "make check"
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# make
Making all in docs
make[1]: Entering directory `/root/psw/ps-watcher-1.0/docs'
pod2man --section=8 ../ps-watcher.in >ps-watcher.8
pod2html --infile=../ps-watcher.in --outfile=ps-watcher.html
make[1]: Leaving directory `/root/psw/ps-watcher-1.0/docs'
Making all in tests
make[1]: Entering directory `/root/psw/ps-watcher-1.0/tests'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/root/psw/ps-watcher-1.0/tests'
make[1]: Entering directory `/root/psw/ps-watcher-1.0'
make[1]: Nothing to be done for `all-am'.
make[1]: Leaving directory `/root/psw/ps-watcher-1.0'
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# make check
Making check in docs
make[1]: Entering directory `/root/psw/ps-watcher-1.0/docs'
make[1]: Nothing to be done for `check'.
make[1]: Leaving directory `/root/psw/ps-watcher-1.0/docs'
Making check in tests
make[1]: Entering directory `/root/psw/ps-watcher-1.0/tests'
make args.t basic.t count.t full.cnf args.cnf basic.cnf count.cnf full.cnf
make[2]: Entering directory `/root/psw/ps-watcher-1.0/tests'
make[2]: `args.t' is up to date.
make[2]: `basic.t' is up to date.
make[2]: `count.t' is up to date.
make[2]: Nothing to be done for `full.cnf'.
make[2]: Nothing to be done for `args.cnf'.
make[2]: `basic.cnf' is up to date.
make[2]: Nothing to be done for `count.cnf'.
make[2]: Nothing to be done for `full.cnf'.
make[2]: Leaving directory `/root/psw/ps-watcher-1.0/tests'
srcdir=.; export srcdir; \
/usr/bin/perl ./driver
args................ok
basic...............ok
count...............ok
full................ok
All tests successful.
Files=4, Tests=10, 5 wallclock secs ( 1.77 cusr + 2.79 csys = 4.56 CPU)
make[1]: Leaving directory `/root/psw/ps-watcher-1.0/tests'
make[1]: Entering directory `/root/psw/ps-watcher-1.0'
make[1]: Nothing to be done for `check-am'.
make[1]: Leaving directory `/root/psw/ps-watcher-1.0'
[root@test ps-watcher-1.0]#
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That's all good. Lets run some tests:
[root@test ps-watcher-1.0]# vi config.ini
[root@test ps-watcher-1.0]# cat config.ini
[httpd]
action = echo "There are $count instances of httpd running"
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# ./ps-watcher --config config.ini --log log
[root@test ps-watcher-1.0]# tail log
ps-watcher: Starting: $Id: ps-watcher.in.in,v 1.25 2003/07/10 11:50:21 rockyb Exp $
ps-watcher: There are 16 instances of httpd running
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# cat config.ini
[httpd]
trigger = $count < 17
action = echo "There are $count instances of httpd running - less than 17"
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# ./ps-watcher --config config.ini --log log
[root@test ps-watcher-1.0]# tail log
ps-watcher: Starting: $Id: ps-watcher.in.in,v 1.25 2003/07/10 11:50:21 rockyb Exp $
ps-watcher: There are 16 instances of httpd running - less than 17
[root@test ps-watcher-1.0]#
[root@test ps-watcher-1.0]# vi config.ini
[root@test ps-watcher-1.0]# cat config.ini
[httpd]
trigger = $count < 16
action = echo "There are $count instances of httpd running - less than 16"
[root@test ps-watcher-1.0]# ./ps-watcher --config config.ini --log log
[root@test ps-watcher-1.0]# tail log -n 1
ps-watcher: Starting: $Id: ps-watcher.in.in,v 1.25 2003/07/10 11:50:21 rockyb Exp $
[root@test ps-watcher-1.0]#
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On the first test, we see that there are 16 instances of httpd running, but on the second test, the trigger doesn't fire, because there are not less than 16. Of course, you can perform any action based on the trigger results. Virtually any test you can think of regarding processes can be evaluated. Pretty cool utility.
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