Make sure pg_dump is a symlink

Author: axilleas

install/centos/README.md

@@ -360,19 +360,26 @@ Quit the database session:
 
 NOTE: because we need to make use of extensions we need at least pgsql 9.1 and the default 8.x on centos will not work.  We need to get the PGDG repositories enabled
 
-Install the pgdg repositories
+If there are any previous versions remove them:
 
-    rpm -Uvh http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/pgdg-centos93-9.3-1.noarch.rpm
+    yum remove postgresql
+
+Install the pgdg repositories:
 
+    rpm -Uvh http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/pgdg-centos93-9.3-1.noarch.rpm
 
 Install `postgresql93-server` and the `postgreqsql93-devel` libraries:
 
     yum install postgresql93-server postgresql93-devel
 
-Rename the service script
+Rename the service script:
 
     mv /etc/init.d/{postgresql-9.3,postgresql}
 
+Make a symlink for `pg_dump` otherwise backup will fail:
+
+    ln -s /usr/pgsql-9.3/bin/pg_dump /usr/bin/pg_dump
+
 Initialize the database:
 
     service postgresql initdb