Compile and Optimize

Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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# 27.2. Compile and Optimize

First of all, to avoid security risks, we'll create an unprivileged user account named `postgres` to be the owner of the Postgres files.

1. To create the Postgres account, use the following command:

                          [root@deep] /# useradd -M -o -r -d /var/lib/pgsql -s /bin/bash -c "PostgreSQL Server" -u 40 postgres >/dev/null 2>&1 || :

2. Move into the new PosgreSQL directory we have untarred earlier, and then move to its subdirectory named `src`. Type the following commands on your terminal:

                          [root@deep] /# cd /var/tmp/postgresql-6.5.3
                          [root@deep ]/postgresql-6.5.3# cd src
                          CC="egcs" \
                          ./configure \
                          --prefix=/usr \
                          --enable-locale

   This tells PostgreSQL to set itself up for this particular hardware setup with:

   - Enable locale support.

3. Edit the `Makefile.global` file, vi +210 `Makefile.global` and change the line:

                          CFLAGS= -I$(SRCDIR)/include -I$(SRCDIR)/backend

   To read:

                          CFLAGS= -I$(SRCDIR)/include -I$(SRCDIR)/backend -O9 -funroll-loops -ffast-math -malign-double -mcpu=pentiumpro -march=pentiumpro -fomit-frame-pointer -fno-exceptions

   These are our optimization flags for the PostgreSQL Server. Of course, you must tailor them to fit your system and CPU architecture.

Now, we must compile and install PosgreSQL on to the server:

                     [root@deep ]/src# make all
                     [root@deep ]/src# cd ..
                     [root@deep ]/postgresql-6.5.3# make -C src install
                     [root@deep ]/postgresql-6.5.3# make -C src/man install
                     [root@deep ]/postgresql-6.5.3# mkdir -p /usr/include/pgsql
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/access  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/commands  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/executor  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/lib  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/libpq  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/libpq++  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/port  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/utils  /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/fmgr.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/os.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/config.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/c.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/postgres.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/postgres_ext.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/libpq-fe.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/libpq-int.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/ecpgerrno.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/ecpglib.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/ecpgtype.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/sqlca.h /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/include/libpq++.H /usr/include/pgsql/
                     [root@deep ]/postgresql-6.5.3# mkdir -p /usr/lib/pgsql
                     [root@deep ]/postgresql-6.5.3# mv /usr/lib/*source /usr/lib/pgsql/
                     [root@deep ]/postgresql-6.5.3# mv /usr/lib/*sample /usr/lib/pgsql/
                     [root@deep ]/postgresql-6.5.3# mkdir -p /var/lib/pgsql
                     [root@deep ]/postgresql-6.5.3# chown -R postgres.postgres /var/lib/pgsql/
                     [root@deep ]/postgresql-6.5.3# chmod 755 /usr/lib/libpq.so.2.0
                     [root@deep ]/postgresql-6.5.3# chmod 755 /usr/lib/libecpg.so.3.0.0
                     [root@deep ]/postgresql-6.5.3# chmod 755 /usr/lib/libpq++.so.3.0
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/postgres
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/postmaster
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/ecpg
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/pg_id
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/pg_version
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/pg_dump
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/pg_passwd
                     [root@deep ]/postgresql-6.5.3# strip /usr/bin/psql
                     [root@deep ]/postgresql-6.5.3# rm -f  /usr/lib/global1.description
                     [root@deep ]/postgresql-6.5.3# rm -f  /usr/lib/local1_template1.description

- The make command compiles all source files into executable binaries.

- The make install command installs the binaries and any supporting files into the appropriate locations.

- The mkdir will create a new directory named `pgsql` under the `/usr/include` and `/usr/lib` directories,

- and then we move all subdirectories and files related to PostgreSQL under `/usr/include` and `/usr/lib` directories to the `/usr/include/pgsql` and `/usr/lib/pgsql` directories respectively with the command mv.

- The chown command will set the correct owner and group permission for the `/var/lib/pgsql` directory.

- The strip command will discard all symbols from the object files. This means that our binary file will be smaller in size. This will improve the performance hit to the program since there will be fewer lines to read by the system when it executes the binary.

- The rm command will remove the `global1.description` and `local1_template1.description` files that are not needed by our PosgreSQL program.

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