CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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Cannot connect to any host (including localhost) using PAC Manager on CentOS 7

I'm using following system: [alexus@wcmisdlin02 Desktop]$ cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [alexus@wcmisdlin02 Desktop]$ uname -a Linux wcmisdlin02.uftmasterad.org ...
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41 views

My “yum update” is not working

I am having problem with "yum update" This is the output: [root@localhost yum.repos.d]# yum update Loaded plugins: fastestmirror, refresh-packagekit, security Setting up Update Process Loading mirror ...
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1answer
47 views

how can I build Radeon proprietary drivers for CentOS 7?

So, I am running CentOS 7 on my laptop and all seems almost OK. Now I'm trying to install the video card driver. # lspci -nn ... 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. ...
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1answer
39 views

Why can't my servers talk to each other over direct ethernet connection?

I have two servers running RHEL 7.2. Each have 2 NICs. One NIC talks to a switch, and other is a direct connection between the two servers. One of the servers will be an NFS server, and the second ...
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5answers
85 views

Mass IP Blocking

I have a game server and someone is spamming it with bots. The SpamBot client makes the handshake with my server using UDP connections. It does this through a list o proxies. Basically, the Spambot ...
3
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0answers
39 views

Can using chcon to essentially bypass selinux be less secure than setting selinux to permissive?

I was wondering if it is possible to make a CentOS 7 server less secure by using chcon than it would be if SELinux were in Permissive mode. I am essentially trying to set up Phusion Passenger with ...
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2answers
46 views

No space on the boot disk to update kernel

I have installed centos 7 on vmware and seem to have ran out of space on the boot drive. Is there a way to add more space without formatting the disk? [root@centos7 /]# df -h /dev/sda1 Filesystem ...
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2answers
29 views

$USER environment variable not changed to root

The USER env variable is unchanged after gaining root access. [user1@comp]$ echo $USER user1 Logged in the system as 'user1'. Now check the output after gaining root access. [user1@comp]$ su ...
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1answer
52 views

How can I create an LVM volume group spanning 2 hard drives? [closed]

I have rented a dedicated server with two 500gb hardisks running Centos 6. On this server there are 4 partitions: 1.boot 2.root 50gb 3.swap 50gb4. 4.empty 400gb Now I want to create a logical ...
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1answer
26 views

What is the different between qcow2 format vs img format?

I want to back up a virtual machine image when I went to the directory where the images are stored /var/lib/libvirt/images/ I found one .img file, the rest were .qcow2, unlucky the virtual machine I ...
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28 views

How do I install and configure NTP on CentOS 7 from source? (include/ntp_crypt.h errors)

I unpacked the .tar.gz file for the newest NTP. I installed the gcc compiler and libcap devel. I ran the ./configure command with various flags and options. I ran make check and found an error. The ...
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0answers
23 views

What is the equivalent to this apt-get when installing PostgreSQL extension for acoustid?

On bitbucket, it says to install the extension using sudo apt-get install postgresql-9.X-acoustid. but I'm running on CentOS... when I replace apt-get with yum: $ sudo apt-get install ...
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1answer
22 views

No entries for Ubuntu after executing update-grub on CentOS

My server is running Ubuntu 12.04 LTS from /dev/sda3 (ext4). I experimented with CentOS 7 some time ago and that is on /dev/sda2 (xfs) and its grub is used for booting. It showed only the latest ...
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1answer
25 views

Can I run 1 install on different PCs?

As the title says can I run 1 install of CentOS on different PCs with different specs from a USB install? Thanks
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13 views

How to disabled login for domain user in CentOS 6

I have all my CentOS 6 machines joined with samba and winbind to a windows domain (2008) and all users that I need to access those machines are in a certain AD group called "engineering". I also have ...
0
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1answer
31 views

How do I install NTP from source on CentOS v7? (/bin/ld: cannot find -lcap)

I unpacked the .tar.gz file. I installed the gcc compiler. I ran the ./configure command with various flags and options. I ran make check and found an error. The exit status is 2. Only 0 is ...
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1answer
29 views

Add AD users to sudo group not working | CentOS 6.7

Just as the title states I am on CentOS 6.7 and want to add two domain admins to the sudo group. I have tried adding both users individully and both together see below: someuser ALL=(ALL) ALL ...
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2answers
59 views

How do I install an older version of Apache httpd in CentOS 6 using YUM

How do I install an older version of Apache httpd on my CentOS 6 machine? When I do: # sudo yum --showduplicates list httpd | expand I get: file:///media/project/repodata/repomd.xml: [Errno 14] ...
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1answer
30 views

How do i create create a bridge for virtual machines

so the issue is that i am using hetzner for my server hosting and they suck at making any working tutorial. i have purchased a /29 subnet block. 136.243.229.24 / 29 - subnet 136.243.6.76 - main ...
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0answers
7 views

lx92 server is not connecting from individual session but its connecting from Jump servre

Please help on this I have an issue in my environment my server Lx52 is connecting from Jump server IX4 but its not connecting from separate putty session Note :we are using Xen desktop through ...
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1answer
27 views

CentOS 6.7: 'No address associated with name' as 'hostname --fqdn' output

please, before read this question, I would pray you to consider that I'm a Linux newbie and that I really need a help. I apologize in advance if the question will be trivial or stupid, I will search ...
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0answers
32 views

Kdump.service FAILED centOS 7

I am getting this error on my centos 7 x86_64 after "yum update". After rebooting the host it went into emergency mode. after entering this: systemctl status kdump.service I get this: ...
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0answers
13 views

How do I get a manifest to run from my Puppet Master server to a Puppet Agent node?

I am trying to run a Puppet manifest for the first time on two new servers. But I keep getting errors. I recently set up two CentOS v7 servers. They have passwordless SSH between them. Ports 22, ...
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1answer
23 views

Remove filesystem from an unpartitioned disk

I have an un-partitioned 500GB disk with a ext3 fs using the entire disk. If I make sure there are no partitions on the disk using fdisk or parted, "ssm list" will still show an ext3 fs on the disk ...
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2answers
209 views

ps - what is the difference between -o comm and -o command?

On CentOS 7.0.1406 I get differing output when running ps -A -o pid,command | grep [r]esque than when I run ps -A -o pid,comm | grep [r]esque The latter returns nothing; the former what I would ...
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1answer
99 views

Linux not using all memory

I have a PC with Fedora 23 OS with 4 GB RAM, but usable memory is 2 GB. When I tried to check memory: # dmesg | grep Memory [ 0.000000] Memory: 1753008K/1816676K available (7670K kernel code, ...
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3answers
322 views

What does make -jn mean?

I am trying to install LLVM on my CentOS machine. In the installation tutorial of LLVM, a flag -jn is specified along with make. It says to perform make -jn and also says "Choose n such that make ...
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1answer
13 views

linefeed in bash script - to email

I am doing printf to a logfile and having that logfile send through mailx, however, it seems that the linefeed "\n" are not recognised or captured in the mail. Snippet of script as below (notice the ...
0
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1answer
71 views

centos 7 font problem unable to read words

hello friends after last update (centos 7 3.10.0-327.4.4.el7.x86_64) i am unable to read text in terminal and also right click menu looks like below screenshot why is this . How to fix this ?
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0answers
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How can I figure out why an HID unikey device is not being recognized by the software needing it?

I have a custom built CentOS machine. For those of you who know Vagrant, the image is at https://atlas.hashicorp.com/puppetlabs/boxes/centos-7.2-64-puppet. When I connect an HID Unikey device to this ...
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2answers
73 views

Cannot connect to localhost on port 4430

I am running vagrant from a virtual box with CentOS and Nginx installed. I've created a reverse tunnel from the vagrant box to a remote server but when I am trying to connect to my localhost on port ...
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0answers
20 views

Back up script causing issues

I've got this backup script I'm trying to use and I'm having issues with it. #Setup Variables DOMAIN=domainexample.com FILENAME=${DOMAIN}.$(date +%Y%m%d) DBSERVER=localhost DATABASE=databasename ...
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1answer
28 views

source RPM doesn't seem to install on CentOS with no errors

My experience with CentOS and RPM's is limited so I might be missing something obvious, but I can't seem to figure this out... I'm trying to install Sphinx into CentOS 6 in a Docker image using the ...
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29 views

Network not working after wake on lan

I just installed a fresh copy of CentOS 7 on my server at home, it worked great until I used etherwake to wake the server up. After doing so the network no longer works, I'm not sure if this is a ...
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1answer
25 views

PowerDNS returning ServFail for all requests

I have been working to get PowerDNS running on CentOS 7 x64 that is up to date. Followed this guide for everything except Nginx because I am using Apache: ...
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0answers
28 views

CentOS 6 - Order of network interfaces when running “ip address show” command

I have installed CentOS 6.7 on new HP Gen9 server and decided to rename interfaces using udev so they are in order eth0-7 from left to right when looking at servers back (originally interfaces were in ...
0
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1answer
31 views

Is it possible to change how usernames are displayed on an AD bound CentOS system?

I don't even know if such a thing is even possible. I'm not referring to the bash shell customization. On an Active Directory bound CentOS 7 system, a local user account will just show as username ...
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24 views

stop while booting giving error of Genetrating “/run/initramfs/rdsosreport.txt”

I am getting following error while booting my centos 7 machine Generating "/run/initramfs/rdsosreport.txt" Entering emergency mode. Exit the shell to continue. Type "journalctl" to view system logs. ...
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2answers
200 views

Why are .so packages provided by the devel packages?

I've seen an interesting pattern in RPM packaging. The main library package will include the shared library itself: /usr/lib64/libavcodec.so.54 The -devel package will provide headers and a ...
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2answers
88 views

net.ipv4.ip_forward reverting to 0 even though set in /etc/sysctl.conf

I set net.ipv4.ip_forward = 1 in /etc/sysctl.conf and ran sysctl -p which caused it to set to 1 as expected in the output of sysctl -a, but sometime between last night and now something set it back to ...
0
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2answers
78 views

Installing (html) tidy conflicts with filesystem package

I'm on CentOS 7 trying to install tidy. Since there is no package provided by the usual suspects, I've downloaded the tidy-5.1.25-64bit.rpm RPM from http://binaries.html-tidy.org/. When I install this ...
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vote
1answer
34 views

How do I rename my TTY terminal?

I have a Centos 7 server with 48 USB to serial devices plugged into it. Using udev, I was able to write a script that creates symlinks in the /dev folder that map the ttyUSBx devices to corresponding ...
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Set firewalld on CentOS 7 for Cloudstack service and unistall iptables

I was following Cloudstack installation instructions, when I realized that iptables is not included in the OS, it was replaced by firewalld. So first of all I've shut down firewalld: systemctl stop ...
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1answer
35 views

yum update exits with “Didn't install any keys”

I just installed Centos 6.7 on Virtualbox and ran yum update with this output: warning: rpmts_HdrFromFdno: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY Retrieving key from ...
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1answer
35 views

no iptables, no selinux, port 81 in virtualhost still not working

I try to open port 81 as a virtualhost. after setting apache, I can CURL localhost:81 from local machine and get response(yes it was listening port 81). However, when visit the same address from ...
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1answer
25 views

grep restart script if not running

Hi guys i'm running into an issue here that I need to have a nohup php script run in the background and make sure it's always running and restarted if it crashes. I run the following bash script using ...
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1answer
52 views

How can I restrict SSH login on CentOS 7 to Active Directory groups? [closed]

I've successfully added CentOS 7 to AD and can login locally or SSH with domain credentials before I try restricting login. I'm using the AllowGroups flag in sshd_config and this works if I specify a ...
1
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0answers
39 views

sssd realm discover: Not authorized to perform this action

I am testing sssd on CentOS and am unable to progress as per the error below: [root@sssd-testing ~]# realm discover realm: Couldn't discover realms: Not authorized to perform this action ...
2
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1answer
54 views

CentOS - meaning of the boot screen progress bar layers/colors

Is there any meaning of the CentOS (I guess RedHat and if I remember correctly Fedora too) boot screen progress bar layers*? (*) Layers ~ white, lilac(?) and violet colours. I can't figure out any ...
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1answer
15 views

Deploying a package through puppet from URL

How can i install a package through puppet by using the URL of the .tar.gz of the package on centos 6 client. Is there any native support in puppet without installing anything extra on the puppet ...