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munin-node and postgresql plugins setup

Sun, 02/05/2012 - 19:37 — sandip

While setting up munin to monitor postgresql, I was getting "[DBD::Pg not found, and cannot do psql yet]" when running `munin-node-configure --suggest | grep postgres`.

I confirmed that the rpm package "perl-DBI-1.52-2.el5" was indeed installed.

However, when I ran a test against the module, it failed with:

# perl -MDBD::Pg -e 1
Can't load '/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBD/Pg/Pg.so' for module DBD::Pg: libpq.so.4: cannot open shared object file: No such file or directory at /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/DynaLoader.pm line 230.
at -e line 0
Compilation failed in require.
BEGIN failed--compilation aborted.

On checking the library, it returned with "libpq.so.4 => not found":

# ldd /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi/auto/DBD/Pg/Pg.so
linux-vdso.so.1 =>  (0x00007fffb60bb000)
libpq.so.4 => not found
libc.so.6 => /lib64/libc.so.6 (0x00007fa36d2c2000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa36d845000)

Indeed libpq.so.4 was missing since postgresql90-libs was installed which only includes "libpq.so.5".

To get libpq.so.4, "compat-postgresql-libs" package needed to be installed.

Once installed the perl module test passed and I was able to get the munin plugins linked using:

# munin-node-configure --shell | grep postgres | sh

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