[root@monitoring ~]# ls -ld /var/cache/centreon/config/engine/*
-rw------- 1 apache centreon 0 May 21 09:59 /var/cache/centreon/config/engine/tmpdir_8AzpTn
drwxrwx--- 2 apache centreon 4096 May 21 09:59 /var/cache/centreon/config/engine/tmpdir_8AzpTn.d
-rw------- 1 apache centreon 0 May 21 10:00 /var/cache/centreon/config/engine/tmpdir_mY0kjq
drwxrwx--- 2 apache centreon 4096 May 21 10:00 /var/cache/centreon/config/engine/tmpdir_mY0kjq.d
-rw------- 1 apache centreon 0 May 21 09:59 /var/cache/centreon/config/engine/tmpdir_V7Kf7E
drwxrwx--- 2 apache centreon 4096 May 21 09:59 /var/cache/centreon/config/engine/tmpdir_V7Kf7E.d
>root@monitoring ~]# stat /var/cache/centreon/config/engine/
File: /var/cache/centreon/config/engine/
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: 801h/2049d Inode: 271452 Links: 5
Access: (6775/drwsrwsr-x) Uid: ( 983/centreon) Gid: ( 983/centreon)
Access: 2025-04-18 18:14:53.000000000 +0500
Modify: 2025-05-21 10:00:11.714572721 +0500
Change: 2025-05-21 10:00:11.714572721 +0500
Birth: 2025-05-21 02:37:32.728165837 +0500
It’s default installation. No poller added, (just using the central one)
Haven’t done anything really.
Looking at the previous posts, looking around. People have been having similar issues (With older version) for almost 2 years now.
Let me try and find an expert to help you here. Out of curiosity, is your Alma standard or a hardened one (e.g. CIS compliant)?
HI @Shami this is my config:
# ls -lah /var/cache/centreon/config/
total 0
drwsrwsr-x 6 centreon centreon 62 Apr 18 15:14 .
drwxrwxr-x 6 centreon centreon 68 Apr 23 13:00 ..
drwsrwsr-x 2 centreon centreon 6 Apr 18 15:14 broker
drwsrwsr-x 2 centreon centreon 6 Apr 18 15:14 engine
drwsrwsr-x 2 centreon centreon 6 Apr 18 15:14 export
drwsrwsr-x 3 centreon centreon 15 Apr 18 15:14 vmware
# cat /etc/os-release
NAME="AlmaLinux"
VERSION="9.5 (Teal Serval)"
ID="almalinux"
Let me try and find an expert to help you here. Out of curiosity, is your Alma standard or a hardened one (e.g. CIS compliant)?
Its Standard. I have setup a KVM VPS for this, I installed and updated OS last night, and it updated to Alma 9.6
HI @Shami this is my config:
I can share my config as well
total 24K
drwsrwsr-x 6 centreon centreon 4.0K May 21 02:37 .
drwxrwxr-x 5 centreon centreon 4.0K May 21 02:49 ..
drwsrwsr-x 3 centreon centreon 4.0K May 21 02:52 broker
drwsrwsr-x 7 centreon centreon 4.0K May 21 10:37 engine
drwsrwsr-x 2 centreon centreon 4.0K Apr 18 18:14 export
drwsrwsr-x 3 centreon centreon 4.0K May 21 02:52 vmware
NAME="AlmaLinux"
VERSION="9.6 (Sage Margay)"
ID="almalinux"
ID_LIKE="rhel centos fedora"
VERSION_ID="9.6"
PLATFORM_ID="platform:el9"
PRETTY_NAME="AlmaLinux 9.6 (Sage Margay)"
ANSI_COLOR="0;34"
LOGO="fedora-logo-icon"
CPE_NAME="cpe:/o:almalinux:almalinux:9::baseos"
HOME_URL="https://almalinux.org/"
DOCUMENTATION_URL="https://wiki.almalinux.org/"
BUG_REPORT_URL="https://bugs.almalinux.org/"
ALMALINUX_MANTISBT_PROJECT="AlmaLinux-9"
ALMALINUX_MANTISBT_PROJECT_VERSION="9.6"
REDHAT_SUPPORT_PRODUCT="AlmaLinux"
REDHAT_SUPPORT_PRODUCT_VERSION="9.6"
SUPPORT_END=2032-06-01
Honestly, while trying to find fix on the forums and going through docs, I can see the whole setup (Using RPM method) has a mix of file/directory permission between “apache” and “centreon”
I don’t know why though. sticking with one user/group would have been much nicer.
Just to show what I am trying to say
yroot@monitoring ~]# ls -al /var/lib/centreon/installs/
total 12
drwxrwxr-x 3 centreon centreon 4096 May 21 02:50 .
drwxrwxr-x 11 centreon centreon 4096 May 21 02:38 ..
drwxr-xr-x 9 apache apache 4096 May 21 02:50 install-24.10.7-20250521_025036
Hi @Shami I installed Centreon 24.10.7 on AlmaLinux 9.6 and I don’t have your issue.
Can you check groups definition?
# cat /etc/group | egrep "(apache|centreon)"
apache:x:48:nagios,centreon-gorgone,centreon
nagios:x:990:centreon-engine,centreon-broker,apache
centreon-broker:x:989:apache,nagios,centreon,centreon-engine,centreon-gorgone
centreon-engine:x:988:centreon-broker,nagios,apache,centreon,centreon-gorgone
centreon:x:987:centreon-broker,centreon-engine,centreon-gorgone,apache
centreon-gorgone:x:986:centreon,centreon-engine,centreon-broker,apache
Can you try to restart httpd and php-fpm?
systemctl daemon-reload
systemctl restart php-fpm httpd
Then try to export configuration again
@Laurent
This is interesting. If it worked for you, I might have messed up then 
Althouh I am pretty sure, I followed everything exactly as given at
https://docs.centreon.com/docs/installation/installation-of-a-central-server/using-packages/
After that, I just added license, enabled few connectors, nothing else is done yet.
proot@monitoring ~]# cat /etc/group | egrep "(apache|centreon)"
apache:x:48:nagios,centreon-gorgone,centreon
nagios:x:986:centreon-engine,centreon-broker,apache
centreon-broker:x:985:apache,nagios,centreon,centreon-engine,centreon-gorgone
centreon-engine:x:984:centreon-broker,nagios,apache,centreon,centreon-gorgone
centreon:x:983:centreon-broker,centreon-engine,centreon-gorgone,apache
centreon-gorgone:x:981:centreon,centreon-engine,centreon-broker,apache
I have done reload/restart of all services (any that I could fine) and have rebooted server a few times as well.
The error happens when “Generate Configuration Files” is checked.
I just did that (after an other reboot/restart) and I get
Preparing environment... OK
Generating files... NOK (Exception received : Cannot open file (writing permission) '/var/cache/centreon/config/engine/tmpdir_BFfW0O.d/' tfile: /usr/share/centreon/www/class/config-generate/abstract/object.class.php] oline: 223] )
Aborted.
This is what I see in that directory
root@monitoring ~]# ls -lah /var/cache/centreon/config/engine/tmpdir_BFfW0O.d/
total 100K
drwxrwx--- 2 apache centreon 4.0K May 21 13:25 .
drwsrwsr-x 8 centreon centreon 4.0K May 21 13:25 ..
-rw-rw---- 1 apache apache 2.4K May 21 13:25 centengine.DEBUG
-rw-rw---- 1 apache apache 1.1K May 21 13:25 commands.cfg
-rw-rw---- 1 apache apache 2.2K May 21 13:25 connectors.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 contactgroups.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 contacts.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 dependencies.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 escalations.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 hostgroups.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 hosts.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 hostTemplates.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 meta_commands.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 meta_host.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 meta_services.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 meta_timeperiod.cfg
-rw-r--r-- 1 apache apache 2 May 21 13:25 otl_server.json
-rw-r--r-- 1 apache apache 2 May 21 13:25 plugins.json
-rw-rw---- 1 apache apache 1.2K May 21 13:25 resource.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 servicegroups.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 services.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 serviceTemplates.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 severities.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 tags.cfg
-rw-rw---- 1 apache apache 1.1K May 21 13:25 timeperiods.cfg
Should I try to “re-install” everything again?
If so, is Alma9 a preferred OS or generally Debian 12 is more “suited” for Centreon? Or there is no difference / preference??
Just want to get going with stable, reliable and maintainable Monitoring solution :)
Did any errors occur during installation (/var/log/dnf.rpm.log)?
You can try to restart on new AlmaLinux 9 or move to Debian 12.
Did any errors occur during installation (/var/log/dnf.rpm.log)?
You can try to restart on new AlmaLinux 9 or move to Debian 12.
No, no error at all.
I still do not see any error in logs. (other than what’s obviously comes up a permission error)
Is there a way to fix it ?? I am note sure why it’s giving permission error when I have not changed anything and all user/groups seem to be setup properly.
What’s your preferred OS for Centreon ? If I am going to start again, I would really like not to end up in the same situation again :(
I guess we will never know what happened here and why I am having issue with it.
And looks like there is no “fix” for it either.
I did fine some one year / 2 year old posts here having “similar” issue with permission error for the same directory.
I will give it an other try, hoping it will work.
Since I didn’t get any response for the “preferred os” part, I will stick with Alma 9 and see if it works any better this time.
hello, there is no preferred OS, Alma 9 will do just fine. I hope your second attempt worked?
