Unable to create PostGIS extension

Question

I am working on a CentOS 7 server with PostGIS 3.2 installed. When I try to create the PostGIS extension using CREATE EXTENSION postgis;, I get the following error:

ERROR:  could not load library "/usr/pgsql-15/lib/postgis-3.so": libgeos_c.so.1: cannot open shared object file: No such file or directory

Note that /usr/pgsql-15/lib/postgis-3.so exists.

Both paths that lead to postgis-3.so AND libgeos_c.so.1 are in the LD_LIBRARY_PATH.

Here's the output of echo $LD_LIBRARY_PATH:

/usr/pgsql-15/lib:/usr/local/lib:

ldd /usr/pgsql-15/lib/postgis-3.so gives:

linux-vdso.so.1 =>  (0x00007ffc309dd000)
libm.so.6 => /lib64/libm.so.6 (0x00002b0c9c9b5000)
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00002b0c9ccb7000)
libgeos_c.so.1 => /usr/local/lib/libgeos_c.so.1 (0x00002b0c9cfbf000)
libproj.so.12 => /usr/local/lib/libproj.so.12 (0x00002b0c9d1f1000)
libxml2.so.2 => /lib64/libxml2.so.2 (0x00002b0c9d45a000)
libz.so.1 => /lib64/libz.so.1 (0x00002b0c9d7c4000)
libdl.so.2 => /lib64/libdl.so.2 (0x00002b0c9d9da000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002b0c9dbde000)
libc.so.6 => /lib64/libc.so.6 (0x00002b0c9ddf4000)
/lib64/ld-linux-x86-64.so.2 (0x00002b0c9c471000)
libgeos-3.6.2.so => /usr/local/lib/libgeos-3.6.2.so (0x00002b0c9e1c2000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b0c9e570000)
liblzma.so.5 => /lib64/liblzma.so.5 (0x00002b0c9e78c000)

My PostgreSQL server is started by systemd using

systemctl start postgresql-15

If I look for the environment variable LD_LIBRARY_PATH in the output of cat /proc/12345/environ | xargs -0 -n 1 echo (where 12345 is the process ID of the postmaster process), it is not there.

How can I create the PostGIS extension?

Laurenz Albe · Accepted Answer · 2023-07-06 10:28:08Z

1

You didn't set the LD_LIBRARY_PATH environment variable in the environment of the PostgreSQL database server. Since you start PostgreSQL via systemd, you have to edit the service file:

sudo systemctl edit postgresql-15

That launches an editor, into which you write:

[Service]
Environment='LD_LIBRARY_PATH=/usr/pgsql-15/lib:/usr/local/lib'

Restart PostgreSQL, and the server should have the variable set in its environment.

answered Jul 6, 2023 at 10:28

Laurenz Albe

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