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

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CentOS and a small boost example

I ask this question here, because I think, it has more to do with linux than with boost itself. So i created a small cpp file: #include <boost/math/special_functions/round.hpp> #include ...
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24 views

rsync --delete did not remove file in destination while with ssh

On my RHEL6 pair of servers, I tested the rsync from server-1 to Server-2 with SSH. Everything was good as expected. However, when I moved a file under A directory, A/x.file to B/ of /home/user on ...
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11 views

Blocked by spamhaus but not blocked

The problem is that all emails I send bounce with the message "Unrouteable address" or "blocked by spamhaus". I have checked my server's IP and domain names on spamhaus and they are not on any of ...
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15 views

Domain on Webserver and different Mailserver leads to error

I have a curious phenomenon. At my provider for domains I had done following settings: A record of the domain (e.g. mydomain.com) routes to another IP address (a remote webserver). MX record are ...
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19 views

Vagrant 1.7.*. is not supporting supporting virtualbox 5.x?

I have installed virtual box-5.0.2r102096. Previously I have virtual box 4.3.*. Vagrant version is Vagrant 1.7.2 but it was giving me following type error when I do vagrant up Failed to mount ...
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22 views

Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

Ok, so I have tried this quite a few times and I'm sure this is very trivial but: I am trying to SSH via command line on Ubuntu into my VM (Centos6) with an RSA key-pair I created using key-gen. I ...
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19 views

How to make modprobe nf_conntrack_ftp persist a reboot on CentOS 7 and firewalld?

I'm stumped. I've seen the related questions about editing /etc/sysconfig/iptables-config, but I'm running CentOS 7 (and webmin/virtualmin), which uses firewalld instead of iptables. How do I get ...
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10 views

Backup issue DirectAdmin - Centos 7

i hope that someone can help me with this. In Centos 7 + DirectAdmin i have a problem when i wan to make a backup from all users as ADMIN. I have googled tried alot of things but nothing helps... I ...
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17 views

Linux capabilities for java to resolve symbolic links

I run a java program by a non-root user. The program has to resolve a symlink to the real file name, but the link is owned by a different non-root user. I used setcap to set capabilities to open ...
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1answer
27 views

How to change systemd service timeout value?

In the company I am working now there is a legacy service and its init script is using old SysvInit, but is running over systemd (CentOS 7). Because there's a lot of computation, this service takes ...
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24 views

Which is more stable, CentOS + Compile everything or Archlinux? [on hold]

I'm using CentOS 7. Some of the software are a little old. I compiled emacs, R, and some others. I've used Archlinux for a few weeks. Some rumors said that Archlinux is not stable - it may breakdown ...
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43 views

How to install/setup mutt with Gmail on CentOS and Ubuntu?

How to setup the email client Mutt to send, receive and read email under CentOS and Ubuntu using a Gmail account as a relay
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how can I delete the remnants of windows from a new CentOS 7 server?

I recently installed CentOS 7 on a new computer that came shipped with Windows 8.1. The BIOS no longer shows windows as a boot option. But my initial analysis of the file system is hard to ...
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22 views

how big should the /boot directory be in a CentOS 7 server?

I am installing CentOS 7 in a 200GB partition of a 2TB hard drive whose other partitions will later become managed by this master CentOS 7 installation. How big should the boot mount installation be? ...
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1answer
41 views

How to shrink root filesystem without booting a livecd

I find myself needing to rearrange a system's partitions to move data previously under the root filesystem into dedicated mount points. The volumes are all in LVM, so this is relatively easy: create ...
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116 views

Upgrading CentOS 6.7 to CentOS 7 on VMWare 11.0

I tried to upgrade(in-place) CentOS 6.7 to CentOS 7.0 on the various environments. I installed CentOS-6.7-x86_64-bin-DVD1.iso on VWware 11.0. And I followed the ...
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5 views

build memcached source on centos6.4 64bit fails

I'd like to build memcached from source on centos 6.4 x86_64 but only get following error. checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu ...
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2answers
22 views

No option of creating new file in centos 7 gui [duplicate]

I have recently installed centos 7 and was trying to create a new file through right click and selecting create a new file option as I have done in centos 6 but there is no option of create new file ...
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17 views

RedHat cluster with rgmanager or pacemaker as resource manager on Oracle VirtualBox

I'm learning RedHat cluster and I have setup a 3 node cluster (Centos 6.7), corosync, cman and rgmanager on Oracle VirtualBox version 5.x. The cluster is working fine (the clustat commmand shows that ...
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2answers
16 views

Extract the spec file out of an RPM

I have an RPM that I built. And I am looking to figure out how to extract the Spec file out of it. I have tried: rpm --scripts -qp sampleBuild.rpm That didn't work. Does anyone know the proper ...
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20 views

replacing windows 8.1 with CentOS 7

A new computer came pre-installed with Windows 8.1. It is an Acer Aspire T desktop. I would like to completely erase windows 8.1 forever from the machine, and replace it with CentOS 7. How can I ...
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Enabling FIPS on a luks encrypted CentOS system breaks boot password

For one of my apps I need to enable FIPS for OpenSSL, while simultaneously using software disk encryption. VM #1 I launched a CentOS VM instance which was software encrypted during install. The ...
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1answer
23 views

How to connect from one VM Guest instance to another to another VM Guest instance

I have Windows 7 as my Host OS and I have a VM guest instance of CentOs 6, now I have created a more Instance guest Centos 6 via Vagrant. All are working fine and I am able to do a ssh/ping from ...
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27 views

Installing Octave Dependencies on CentOS 6 using yum

I am trying to install Octave 4.0.0 (from source) locally in my home directory on a CentOS 6 cluster. This is a rather extensive install (see list of dependencies). I have several issues : From ...
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Partition resize in CentOS 7

I have a RAID 6 array set up under CentOS 7 which originally had four 1TB drives assigned, resulting in a total capacity of 2TB. After much fussing about as described here, I was able to add a fifth ...
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21 views

Maintain 32 and 64 bits version of rpm

let me explain this a little bit, I am in charge of update part of our company product from 32 to 64 bits. At the end, we should have a 64bits kernel + 32bits applications + some 64bits ...
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1answer
18 views

NFS + SFTP on the same directory - are there any pitfalls?

I currently have an SFTP (actually vsftpd) server I use for regular archives. The OS is Centos 7.0. While I used to use SFTP, I still could benefit from having an NFS connection to this server (rw). ...
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17 views

Strange Copy/Paste issue into Virtual Box

When I copy a command from Evernote on the Mac host into the CentOS (also tried Fedora and openSUSE) VM the command will not work. If I type in the same exact thing manually it will work. This ...
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8 views

Installing foreman 1.9 configuration help

I can't seem to find the answer that I am looking for so any help here would be hugely appreciated. I am doing a POC with foreman 1.9 on a CentOS7 server. Our infrastructure as it stands right now as ...
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45 views

Dual Boot Configuration with SSD and HDD

I'm very new to Linux. I have been using Windows/Mac during my whole life, but now I have decided to use Linux. So I'm trying to configure a dual boot system with Windows 10 and CentOS 7. I already ...
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10 views

Adding existing data to SVN server-side repository

I have a CentOS 7-based SVN server. Is there a way to create a repository over existing data? The server is based in /home/server. I need this folder to become an SVN repository, so my friends and I ...
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CentOS 7 installation falls back to text-mode on Parallels Server Mac VM

Every time I am trying to install CentOS 7 in Parallels Server Mac, the installation wizard falls back to text-mode. I am getting this error: X startup failed, falling back to text mode ...
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2answers
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What is the problem of giving the right to use sudo vim? [closed]

I'm using Mac OX 10.10. I would like to know what problems are caused by this: user ALL=(ALL) /usr/bin/vim /etc/httpd/confs/httpd.conf I think this is in /etc/sudoers. I also have Cent OS. Does this ...
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1answer
35 views

Why am I limited to ~10-20 usb devices?

I am trying to hook up 27 USB device to an Intel NUC running CentOS 7 but no matter what I do the system can never see more than 20. I have tried multiple models of NUCs and even tried adding an ...
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Adding CentOS 7 to Active Directory

I am having a hard time adding a CentOS 7 machine to my domain (Active Directory 2012 running in Windows 2008 mode). I am using realmd to join the machine to the domain. Here is what I have checked so ...
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1answer
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Set persistent static routes for 4 interfaces on 2 CentOS 7.1 servers

I am tasked to set up two test servers running CentOS 7.1 (Minimal install; the NetworkManager is disabled on both), and have run into a set of issues that I would like to get help here. The ...
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1answer
29 views

Can't install fail2ban on Centos 7.1

I am trying to install fail2ban on my centos 7.1 server I did: yum install epel-release yum install fail2ban But i am getting some error messages: yum install epel-release Package ...
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20 views

Can't install additional debug infos in the CentOS 6.7

I am attempting to debug coredump of the some application on the latest CentOS 6.7 and gdb gives me hints that some debug infos are missing, for example: Missing separate debuginfo for ...
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32 views

Error becoming root centos

I'm getting the following error when I'm trying to become root -bash-4.1$ sudo su - Could not open a connection to your authentication agent. * Error: Problem adding; giving up I have tried eval ...
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23 views

/var/run/docker.sock: permission denied

I tried to run this docker image which load inside another image. However, I run into /var/run/docker.sock: permission denied on CentOS 6.6 and docker 1.7.1 which I reported here. Which linux ...
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1answer
19 views

how to install claws-mail rpm package?

I want to install claws-mail into my centos7 with three different methods,all of them fails. method1:intall directly [root@localhost ~]# yum install claws-email Loaded plugins: fastestmirror, ...
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Change eth settings before udev loads

I have a custom version of CENTOS that I'm importing into Hyper-V on a Windows Server. Whenever I import it however, the mac addresses of eth1 and eth2 are now different. So they get incremented to ...
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1answer
50 views

How to start my network in centos7?

I have edited the /etc/sysconfig/network-scripts/ifcfg-enpos2 : BOOTPROTO="static" IPADDR=192.168.1.105 NETMASK=255.255.255.0 NM_CONTROLLED=no I can't surf the web When to reboot,how to start my ...
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1answer
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persisting multi-factor user data for custom pam authentication in CentOS 7

I am designing n-factor authentication for CentOS 7 using a custom PAM module. When the user tries to SSH, they will be texted a pin code, and be prompted to enter the pin. Where should I store the ...
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How to configure Apache init scripts, after compiling and installing the sources?

I installed Apache using this script https://gist.github.com/Benedikt1992/e88c2114fee15422a4eb The system is a freshly installed CentOS 6.7 minimal system. After installation I can find the apache ...
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Centos Apache virtualhost bugs when not using www

I have these extra lines in default httpd.conf: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot "/var/www/html" ServerName maindomain.com </VirtualHost> <VirtualHost ...
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SASL fails to with against LDAP

So I am running into a whirlwind of issues with my cyrus install. I am setting up a multi-domain kolab groupware solution. I am on centos 6.7 I am getting this flooding my error logs when I try to ...
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Lock SSH DOR access the same as VSFTPD?

I'm quite new to Linux, I'm running CentOS 6.7 and I'm trying to follow best practice procedure of creating a user "instead of using root" but I want to restrict their SSH file browsing capability to ...
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10 views

setting up subdomain at centmin mod

I am in need of help at setting up subdomains in my CentOS using centmin Mod. This is what I have done so far. Purchase a VPS with IP address: xxx.xxx.xxx and hostname: ns.mydomain.com Install ...
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30 views

Uninstalling packages installed by debuginfo-install

How do I delete debug packages that are installed by debuginfo-install? When I search for them via sudo yum list installed none of the installed packages are listed, even when I enabled the debuginfo ...