Postings by Paul R. Ganci

Help with yum

I just did a fresh minimal install of centos 7 on new hardware. While
playing around with window systems I removed X windows like so:

and then tried to re install

which gives this error:

Maybe run: yum groups mark install (see man yum)
No packages in any requested group available to install or upgrade

I tried running:

and get the same message. I tried different permutations removing the
"s" on groups. Nothing seems to bring back the yum "X Window system"

How to upgrade CentOS 6.9 KVM host to 7.4.1708 and not re-install guests

I have a Windows 7 KVM guest running on a Centos 6.9 KVM host. I would
like to upgrade the host system to CentOS 7.4.1708 without having to
re-install from scratch the KVM guest. What procedure should I use to
move the guest off the host system, upgrade the CentOS version and then
move the KVM Guest back to the host? For example, Is there a recommended
way to move the KVM Guest to a USB stick and then move it back to the
upgraded host? Thank you for your help.

Postfix error

For well over a year and half I have had two incoming mail servers
running postfix + amavisd + spamassassin + clamd on a CentOS 7 system
working flawlessly.

Raspberry PI3 - CentOS armv7hl gnome desktop

Maybe there is a better place to post this message but as my question
was still CentOS related thought I would start here. Please advise if
there is a better forum of which to ask this question.

I am playing around with making a "desktop" workstation out of a
Raspberry PI3. I have had no problems installing the OS and pretty much
have everything working except a Gnome desktop.

I did:

and from what I can tell everything necessary is installed.

Cannot boot CentOS 7 VM after updating Host CentOS 7 Kernel

I have something very strange that occurred. After updating the kernel
on my host CentOS 7 Dell 2950iii I have found that one of my CentOS 7
guest VMs will no longer boot... it just stops at the grub prompt (a
second VM functions just fine). I have no idea why this problem occurred
and have been unable to fix it. On google I have found several
suggestions as to how to repair grub but so far none have worked.

OT DMARC question

I notice that postfix generates bounce messages that without going
through some effort do not get DKIM signed. I have setup my incoming
gateway server so that messages to my email subscribers are bounced
using a local_recipient_map. However I received a report from because a Linked-In subscriber sent a message to an email
address of a non-existent local user. Linked-In flagged the
Mailer-Daemon bounce message.

mysql local_recipient_map

I have setup a mysql data baseto provide a list of of local email
recipients for a gateway email server. The configuration file looks like

If I do a test query ala:

This last command seems to indicate that the query completes

CentOS 6.8 Apache-2.2.15-53 re-write question

I was wondering if somebody could help me with an Apache re-write rule. Apparently CentOS 6.8 is running apache-2.2.15-53. I am trying
to redirect all pages except for two pages. The apache rewrite directives in the httpd config are:

RewriteEngine on
RewriteCond %{REQUEST_URI}!^/test/
RewriteCond %{REQUEST_URI}!^/my-folder/
RewriteRule (.*)$1 [R=301,L]

These commands should cause all requests to get re-directed to <a href="" title=""></a> except for those with a /test or /my-folder on the end of the

Centos 7.1 openldap-2.4.39 question

I have two instances of an openldap-2.4.39 server running with syncrepl
in a master-master replication setup. These are Centos 7.1 test servers
which have been running for over 2 months now with no problems. Partly
the good behavior of the LDAP servers is due to very little exercise.
Yesterday I decided to try and see exactly how well replication was

KVM Questions

I have a system with two CentOS 7.1 guests. When I created the VMs I did
not have enough storage space in the default location
/var/lib/libvirt/images so I moved the default location to a directory
/home/vmimages. While this configuration is functional I regret creating
a new storage pool in /home. I would like to create a separate partition
to place the VM images removing them from their present /home/images
location. The /home partition is presently empty other than the VM
images directory so I can easily steal space from it (using only ~4% of
500GB). However, I have a problem.

Iptables config removed with 7.1 update

I had turned off firewalld and was using iptables when I originally
installed CentOS 7.0. Two days ago I upgraded my CentOS 7.0 to 7.1.
Everything seemed to be fine. Today I discovered that my iptables
configuration was removed with the update. Has anyone else experienced
this on doing upgrade? Literally the /etc/sysconfig/iptables is gone and
the /etc/sysconfig/iptables-config is the blank template that comes with
the distribution. This seems to me to be a serious bug with the upgrade.

LDAP TLS error -8023

Can somebody tell me what this error means (server, domain etc. changed
to protect the innocent)?

ldapsearch -H ldap:// -ZZ -W -D
cn=Boss,dc=example,dc=com -b dc=example,dc=com uid=testuser homeDirectory
ldap_start_tls: Connect error (-11)
additional info: TLS error -8023:A PKCS #11 module returned
CKR_DEVICE_ERROR, indicating that a problem has occurred with the token
or slot.

My google searches do not seem to provide any useful information. I am
just looking for some hints as to what to look for in my configuration.

CentOS 6.6 KVM Windows 7 Pro VM Device USB 04e8:6860

I have a CentOS 6.6 system running KVM with a Win 7 Pro VM. Over the
weekend I was playing around with the VM trying to get it to see my
Samsung Note 4. Apparently I removed the phone without removing the
hardware from the VM. Now the VM will not start because Device USB
0438:6860 is not there. I tried to remove the hardware from the VM using
virt-manager but that does not remove the error message and the VM will
still not start.

samba3x PDC and Win XP

I am at my wits end on this one. Ever since I upgraded to samba3x
(present version 3.5.10-0.110.el5_8) in preparation for adding a Win 7
client, my WinXP client can no longer find their roaming profiles nor
can they assign their home shares to a drive at login. Logins and
authentication work just fine and I can see the home and profile shares
from the Win XP client after login.