The RPM packages of PostgreSQL put pg_config into the postgresql-devel
package, not the main server one. And if you have a RPM install of PostgreSQL
9.0, the entire PostgreSQL binary directory will not be in your PATH by default
either. Individual utilities are made available via the alternatives
mechanism, but not all commands will be wrapped that way. The files installed
by repmgr will certainly not be in the default PATH for the postgres user
on such a system. They will instead be in /usr/pgsql-9.0/bin/ on this
type of system.
When building repmgr against a RPM packaged build, you may discover that some development packages are needed as well. The following build errors can occur::
/usr/bin/ld: cannot find -lxslt /usr/bin/ld: cannot find -lpam
Install the following packages to correct those::
yum install libxslt-devel yum install pam-devel
If building repmgr as a regular user, then doing the install into the system
directories using sudo, the syntax is hard. pg_config won't be in root's
path either. The following recipe should work::
sudo PATH="/usr/pgsql-9.0/bin:$PATH" make USE_PGXS=1 install
If when building, you receive a series of errors of this form::
/usr/bin/ld: skipping incompatible /usr/pgsql-9.0/lib/libpq.so when searching for -lpq
This is likely because you have both the 32 and 64 bit versions of the
postgresql90-devel package installed. You can check that like this::
rpm -qa --queryformat '%{NAME}\t%{ARCH}\n' | grep postgresql90-devel
And if two packages appear, one for i386 and one for x86_64, that's not supposed to be allowed.
This can happen when using the PGDG repo to install that package; here is an example sessions demonstrating the problem case appearing::
.. Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package postgresql90-devel.i386 0:9.0.2-2PGDG.rhel5 set to be updated ---> Package postgresql90-devel.x86_64 0:9.0.2-2PGDG.rhel5 set to be updated --> Finished Dependency Resolution
Dependencies Resolved
========================================================================= Package Arch Version Repository Size
Installing: postgresql90-devel i386 9.0.2-2PGDG.rhel5 pgdg90 1.5 M postgresql90-devel x86_64 9.0.2-2PGDG.rhel5 pgdg90 1.6 M
Note how both the i386 and x86_64 platform architectures are selected for installation. Your main PostgreSQL package will only be compatible with one of those, and if the repmgr build finds the wrong postgresql90-devel these "skipping incompatible" messages appear.
In this case, you can temporarily remove both packages, then just install the correct one for your architecture. Example::
rpm -e postgresql90-devel --allmatches yum install postgresql90-devel-9.0.2-2PGDG.rhel5.x86_64
Instead just deleting the package from the wrong platform might not leave behind the correct files, due to the way in which these accidentally happen to interact. If you already tried to build repmgr before doing this, you'll need to do::
make USE_PGXS=1 clean
to get rid of leftover files from the wrong architecture.
The Debian packages of PostgreSQL put pg_config into the development package
called postgresql-server-dev-$version.
When building repmgr against a Debian packages build, you may discover that some development packages are needed as well. You will need the following development packages installed::
sudo apt-get install libxslt-dev libxml2-dev libpam-dev libedit-dev
If you're using Debian packages for PostgreSQL and are building repmgr with the USE_PGXS option you also need to install the corresponding development package::
sudo apt-get install postgresql-server-dev-9.0
If you build and install repmgr manually it will not be on the system path. The binaries will be installed in /usr/lib/postgresql/$version/bin/ which is not on the default path. The reason behind this is that Ubuntu/Debian systems manage multiple installed versions of PostgreSQL on the same system through a wrapper called pg_wrapper and repmgr is not (yet) known to this wrapper.
You can solve this in many different ways, the most Debian like is to make an alternate for repmgr and repmgrd::
sudo update-alternatives --install /usr/bin/repmgr repmgr /usr/lib/postgresql/9.0/bin/repmgr 10 sudo update-alternatives --install /usr/bin/repmgrd repmgrd /usr/lib/postgresql/9.0/bin/repmgrd 10
You can also make a deb package of repmgr using::
make USE_PGXS=1 deb
This will build a Debian package one level up from where you build, normally the same directory that you have your repmgr/ directory in.