@scottalanmiller.

Solved:
sudo chown -R firebird:firebird /tmp/firebird

Thank you very much for your help and guide.

@black3dynamite, do you need some specific help? I mean, I do web apps that works with firebird.

@scottalanmiller.

Solved:
sudo chown -R firebird:firebird /tmp/firebird

Thank you very much for your help and guide.

@scottalanmiller it is good to hear that, I thought I was wrong. Now, please look at the log file: it says Can't access lock files's directory /tmp/firebird/

It seems firebird user has no access to that folder.

Let me test something, allowing firebird user to access it.

@scottalanmiller Thanks a lot.

Checked firebird.log.rpmsave on /var/log/firebird:
1
localhost.localdomain (Client) Sun Jul 16 22:36:44 2017
/usr/sbin/fbguard: guardian starting /usr/sbin/fbserver
localhost.localdomain (Server) Sun Jul 16 22:36:44 2017
Database: /var/lib/firebird/system/security2.fdb
Can't access lock files' directory /tmp/firebird/
localhost.localdomain (Client) Sun Jul 16 22:36:44 2017
/usr/sbin/fbguard: /usr/sbin/fbserver terminated due to startup error (2)
localhost.localdomain (Client) Sun Jul 16 22:36:44 2017
/usr/sbin/fbguard: /usr/sbin/fbserver terminated due to startup error (2)

@scottalanmiller, Hi!, sorry, I didn't see this quote.

My name is Abner Hernandez. From Barinas, Venezuela.
(8.625676, -70.202637)
47 years old. Male. Married and 2 beautiful girls (22/19)
About 30 years developing. Several languages / databases.
Learning almost every day.
Jehova's Witness since very young.

@scottalanmiller sorry, where can I check firebird logs?

@scottalanmiller do you know if it is possible (and how) to install firebird 2.5.7
classic / superclassic con CentoOS 7 ?

@abnerh69

Looks like something is missing on EPEL 7 (el7)

Don't you think?

@abnerh69

On CentOS 7.3.1611 (Core) installation reports:

Dependencies Resolved
Package Arch Version Repository Size

Installing:
firebird x86_64 2.5.7.27050.0-1.el7 epel 648 k
Installing for dependencies:
firebird-superserver x86_64 2.5.7.27050.0-1.el7 epel 2.7 M

Transaction Summary

Install 1 Package (+1 Dependent package)

Total download size: 3.4 M
Installed size: 14 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): firebird-2.5.7.27050.0-1.el7.x86_64.rpm | 648 kB 00:00:03
(2/2): firebird-superserver-2.5.7.27050.0-1.el7.x86_64.rpm | 2.7 MB 00:00:49

Total 70 kB/s | 3.4 MB 00:00:49
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : firebird-superserver-2.5.7.27050.0-1.el7.x86_64 1/2
firebird983:
Installing : firebird-2.5.7.27050.0-1.el7.x86_64 2/2
Verifying : firebird-2.5.7.27050.0-1.el7.x86_64 1/2
Verifying : firebird-superserver-2.5.7.27050.0-1.el7.x86_64 2/2

Installed:
firebird.x86_64 0:2.5.7.27050.0-1.el7

Dependency Installed:
firebird-superserver.x86_64 0:2.5.7.27050.0-1.el7

Complete!

@abnerh69

Mark this: on CentOS release 6.9 (Final), it reports installation:
installed:
firebrid.x86_64 0:2.5.5.26952.0-2.el6

Dependency Installed:
firebird-classic-common.x86_64 0:2.5.5.26952.0-2.el6
firebird-filesystem.x86_64 0:2.5.5.26952.0-2.el6
firebird-libfbclient.x86_64 0:2.5.5.26952.0-2.el6
firebird-libfbembed.x86_64 0:2.5.5.26952.0-2.el6
firebird-superclassic.x86_64 0:2.5.5.26952.0-2.el6
libicu.x86_64 0:4.2.1-14.el6