building-frr-for-centos7: fix frr config path error

[victory460]

According to the building-frr-for-centos7 document, the following errors were found during building：

[root@c7dev frr]# systemctl start frr
Job for frr.service failed because the control process exited with error code. See "systemctl status frr.service" and "journalctl -xe" for details.
[root@c7dev frr]# journalctl -xe
-- Unit frr.service has begun starting up.
Aug 05 10:35:05 c7dev frrinit.sh[76294]: cannot run start: /usr/local/etc/frr/daemons does not exist
Aug 05 10:35:05 c7dev systemd[1]: frr.service: control process exited, code=exited status=1
Aug 05 10:35:05 c7dev systemd[1]: Failed to start FRRouting.
-- Subject: Unit frr.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit frr.service has failed.
-- 
-- The result is failed.

[donaldsharp]

FRR sets sysconfdir based upon what is passed in on configure --sysconfdir=.... The fact that you have /usr/local/etc/frr implies that the sysconfdir passed in was that. What does your config.log say here?

[victory460]

--sysconfdir

FRR sets sysconfdir based upon what is passed in on configure --sysconfdir=.... The fact that you have /usr/local/etc/frr implies that the sysconfdir passed in was that. What does your config.log say here?

Yes, so change it in this PR. Thank a lot.

[ton31337]

Do we need to apply such a change for all the examples we have?

[victory460]

Do we need to apply such a change for all the examples we have?

Thanks!
Yes, now check and modify all the examples. @donaldsharp @ton31337

[donaldsharp]

can I get an output of your config.log as I asked for? I would like to understand how we got here and this would help and that is why I asked for it

[victory460]

can I get an output of your config.log as I asked for? I would like to understand how we got here and this would help and that is why I asked for it

Thanks for your review.
Yes, you can follow the document , it will output this config.log:

.........
datadir='${datarootdir}'
datarootdir='${prefix}/share'
docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
dvidir='${docdir}'
e_bindir='/usr/bin'
e_frr_libstatedir='/usr/local/var/lib/frr'
e_frr_runstatedir='/usr/local/var/run/frr'
e_frr_sysconfdir='/usr/local/etc/frr'         // by default, it config sysconfdir='/usr/local/etc/frr' 
........

By default, it config sysconfdir='/usr/local/etc/frr' , But it use /etc/frr/ as frr confdir in the document .
If we follow the document without configure --sysconfdir=/etc, it will :

[root@c7dev frr]# systemctl start frr
Job for frr.service failed because the control process exited with error code. See "systemctl status frr.service" and "journalctl -xe" for details.
[root@c7dev frr]# journalctl -xe
-- Unit frr.service has begun starting up.
Aug 05 10:35:05 c7dev frrinit.sh[76294]: cannot run start: /usr/local/etc/frr/daemons does not exist
Aug 05 10:35:05 c7dev systemd[1]: frr.service: control process exited, code=exited status=1
Aug 05 10:35:05 c7dev systemd[1]: Failed to start FRRouting.
-- Subject: Unit frr.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
-- 
-- Unit frr.service has failed.
-- 
-- The result is failed.

@donaldsharp

[victory460]

@donaldsharp