Questions tagged [centos]
Community ENTerprise Operating System; a Linux distribution based on Red Hat Enterprise Linux widely used on web servers.
3,217
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VirtualBox can't connect from host to guest after Windows update
I can't connect to the guest machine from the host. Everything was working fine until my PC got Creators Update.
My setup:
VirtualBox 5.1.22
Host Windows 10
Guest Centos 7
The Host-Only network is ...
1
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1
answer
1k
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Centos navigate SFTP User to have access to specific directory [closed]
I am trying to give user full access to specific directory.
I am using SFTP on Centos 7. I am creating new group and user
groupadd ftpusers
useradd -m newuser -s /sbin/nologin -g ftpusers
chown ...
1
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1
answer
1k
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Uninstall GhostScript installed from source on CentOS server
I have installed GhostScript 9.21 from source into /usr/local and want to remove it and use the OS-default version instead. The GS Makefile has no "uninstall" option and I cannot find any articles ...
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0
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300
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SSSD list allowed users only
We are using SSSD for authentication using LDAP. And I filter the user access using simple_allow_groups as follows:
access_provider = simple
simple_allow_groups = Computer Admins
(Note: Computer ...
1
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0
answers
156
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CentOS-6.6 installed within VirtualBox-5.1.22 doesn't support screen resize
VirtualBox-5.1.22-115126-Win.exe
CentOS-6.6-x86_64-minimal.ova
I followed the https://wiki.centos.org/HowTos/Virtualization/VirtualBox/CentOSguest and
have successfully installed the ...
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0
answers
24
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Error while installing openvswicth
I am trying to install OVS on my host machine running centOS.
While running the build file I am getting an error as:
selinux-policy-devel is needed by Openvswictch.
I read about selinux and found ...
1
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0
answers
348
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unable to create file in directory even it has group permission
i've created a group call "perm" and it has user apache & ruey.
[root@xxx ~]# groups apache
apache : apache perm
[root@xxx ~]# groups ruey
ruey : ruey perm
i've set group "perm" into my web ...
1
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2
answers
831
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Can't get port 23 open on CentOS 6.8
I have just upgraded from CentOS 6.6 to 6.8 (64bit). We have a site-licensed telnet client that allows multiple windows on a single database seat. I have disabled SELinux and rebooted the system.
# ...
1
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0
answers
7k
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How to ensure that there is no MAC address conflict using Virtualbox?
I want to set up cluster of 5 machines on Virtualbox; the Host OS is Windows 10 and Guest OS are all CentOS 6.8.
I created a virtual server with name base and did all the necessary configuration, ...
1
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1
answer
188
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How do I run ZeroNet in a Vagrant CentOS 7 VirtualBox?
I started ZeroNet in a CentOS 7 Vagrant VirtualBox, but I can't access it from my host. From the guest it works:
[vagrant@localhost ~]$ curl http://127.0.0.1:43110/
Location changed: /...
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1
answer
425
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Centos 7 Serial Port Permissions in VMWare Player
Ok, what am i missing.
TLDR; I've done all I'm supposed to with permissions, lock directory, compiling, etc of Kermit and I still get the "Sorry, write access to UUCP lockfile directory denied."
...
1
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1
answer
207
views
Lucene++ error on installation Poedit 1.8.12 on CentOS 7
Such as the title says, I am having an error on the installation of Poedit 1.8.12 on CentOS 7.
I have installed Lucene++ (almost every version from GitHub) but I always get the same error message:
...
1
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1
answer
860
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<math.h> fails on Intel Centos 6.6 cluster
I'm on a university cluster, no su for me. I am trying to get Keras working, with either tensorflow or theano. Tensorflow fails because the system only has CUDA 7.5. It has an Intel chipset, but it's ...
1
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2
answers
1k
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LXC configuration : Alloting a disk space
I am trying to create an LXC container by following the below containers.
"Introduction to Containers on Linux using LXC"
I am able to create the container and start it. But when I execute the df-h ...
1
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0
answers
141
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Installing Multicraft on EC2 Instance, phpMyAdmin will not load on browser
I'm following the instructions located at this page.
I'm at step 3 where it says:
You can now login to phpMyAdmin through either yourdomain.com/phpMyAdmin or yourserverIP/phpMyAdmin. Please note that ...
1
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1
answer
4k
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command for checking SMTP log and POP logs for a specific email address
My domain was recently hacked and used for spamming and blacklisted by google gmail. I have done the cleanup and updates now requesting a delisting from google.
My system is CentOS, and I know it ...
1
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1
answer
719
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Telnet host 25 - no route to host
I have basic VM (xenserver installed on dedicated machine) with cPanel on CentOs 6.8, exim 4.87 - nothing fancy. For 2 weeks I am having issue with sending e-mails - it is not global, affects about 10%...
1
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1
answer
3k
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How to monitor Nginx 500 errors and send email alerts?
I'd like to setup an alert system which monitors the nginx access log and sends an email alert every time it gets a 500 or 502 error. I want a simple but reliable setup but am open to all suggestions. ...
1
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0
answers
240
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DHCP Server Issuing same IP address to client
Greeting Guru's
I am using CentOS DHCP and DNS Server. Recently, I have notice that the DHCP Server has been issuing multiple IP Address to same client (Phone/Laptop). This has caused IP Conflict in ...
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0
answers
2k
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packetfence servies does not start right after installation
I have installed packetfence on centos 7.2.
every goes smooth during installation but after successfully installation
packetfence service is not starting .
I tried to start manually but it does ...
1
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0
answers
407
views
Is "yum update" safe?
CentOS 6.6
I have a production server and a test server. I just tried "yum update" on the latter and everything looked fine. It took 14 minutes. Before I repeat the operation on my critical server, I ...
1
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1
answer
2k
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Edit file in vim without modifying owner
I have a set of files in a directory /etc/tomcat/conf that are owned by user tomcat and group www.
When I use vim to edit a file in that directory, the ownership of that file changes to my user/group....
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0
answers
1k
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SEGV Error Transmission-daemon CentOS
Something strange happend with Transmission. It had worked perfect all day, but after I added it to autoboot (via systemctl), it broke.
There is no difference which hdd use to downloading. After few ...
1
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1
answer
2k
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Blacklisting i2c_hid does not work
I have a dell vostro 15 and I am setting up centos 7 in my laptop. After installation my touchpad is not working and I have referred online and lot of suggestions are given that I should try ...
1
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0
answers
51
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'passwd' directly escalates user
When I try to change my password with passwd, it directly su to the root, how was that be possible?
[fingal@cs-linux ~]$ passwd
[root@cs-linux fingal]#
I was using CentOS 6.7, and the account was ...
1
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1
answer
1k
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Synaptics touchpad Xiao Mi Air 12.5 doesnt work on CentOS7 with 4.8.x elrepo kernel
I recently bought a Xiaomi Air 12.5 and installed centos 7 on it with 4.8.x kernel from elrepo. I got everything working perfectly except the Synaptics touchpad.
Spend days trying, but right now I am ...
1
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0
answers
204
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Installing OpenSSL on CentOS vagrant box gives 404 error
I'm running a CentOS 6 vagrant virtual machine under VMWare Fusion. The machine is working well. I need to test LDAP over SSL which requires me to install OpenSSL, so I ran sudo yum install openssl ...
1
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1
answer
748
views
Headless graphics adapter for CentOS with OpenGL support? (Or similar blade server device?)
I have two Linux applications that require a frame buffer that can support OpenGL calls (R and Processing).
I have tried virtual/software frame buffers like Xvfb, but they do not support the OpenGL ...
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0
answers
111
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Can't boot from USB (Centos7, Samsung series 5 ultrabook)
As in the title, I've got a series 5 ultrabook, am currently running Ubunutu 16.04, and am attempting to install CentOS7. I've written the iso to a usb, and, as suggested in various resources, ...
1
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1
answer
116
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Centos 7 Network Not Coming Up
I have two physical machines that have dual NICs. One is running CentOS 6 and one was just upgraded to CentOS 7. I have the two NIC's bonded:
TYPE=Bond
DEVICE=bond0
NAME=bond0
BOOTPROTO=none
ONBOOT=...
1
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0
answers
148
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Read/Write directly to Linux files from Windows using editor
Is there a way to mount and share a linux directory so Windows can access it?
I would like to read/write directly to files from a text editor for quicker live development with Apache
Running CentOS ...
1
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1
answer
819
views
Cannot type in screen session after C-a
Often when detaching from a gnu screen, using the ctrl-a+d command, I accidentally don't click the d (simply pressing ctrl-a), which prevents any kind of input or commands afterwards. Typing does not ...
1
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0
answers
892
views
systemctl suspend not working as expected
I am currently running CentOS 7.2 on a Lenovo ThinkPad, I have been having some weird issue lately, where the machine seemingly wakes up while closed, and in my laptop bag.
I am trying to manually ...
1
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0
answers
38
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eth0 interface disappears after router failure
I'm running CentOS-7-x86_64-DVD-1511 over VirtualBox on a Windows 7 64bit machine. All the configurations are at its default values, except for VBox Networking, which is set to Bridge. I'm using DHCP.
...
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0
answers
765
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Xen booting stuck on 'Loading initial ramdisk...'
After successfull instalation of xen, The xen kernel cannot booting and stuck on Loading inital ramdisk
I followed the instalation tutorial from here.
I'm using centos-release-7-2.1511.el7.centos.2....
1
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0
answers
1k
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grub.conf issue while OVA deployment to AWS ec2
I have been trying to deploy an OVA to AWS. And came across a strange problem. AWS looks for file with name 'grub.conf' in all partitions and doesn't deploy OVA if multiple files exist with name 'grub....
1
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1
answer
1k
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How do I remove a delay created using dm-delay?
As part of testing my application, I wanted to see what would happen on hard-disk slow down or failure. I added a 500ms delay using dmsetup create delayed. I'm not very familiar with device mapper, ...
1
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1
answer
871
views
Virtualbox Bridge vs NAT (same setup, NAT works but bridge doesn't)
I installed CentOS 7 on a virtualbox machine.
When I set the network to NAT, ping gets packets back, wget gets pages and yum also works.
However, if I shutdown the machine and set the network to ...
1
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0
answers
112
views
my tab key behaves strangely in CentOS gnome terminal only in empty shell prompt
In my CentOS 6.7 GNOME desktop, something went wrong while I was trying to show a document to my daughter. I must have pressed some keys by accident.
The strange behavior is, when I press tab key in a ...
1
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0
answers
170
views
RAID1 Partitioning Scheme for a Linux Server
I'm having trouble setting up a RAID1 for my server where both drives are bootable. What I'm doing now is /biosboot and /boot partitions on both drives, then I have my LVM volume group with logical ...
1
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1
answer
1k
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Using Master Node for Internet
So I have a cluster of about 30 nodes. 29 nodes are run from the master node, which controls all the other nodes. Master node has access to internet. However other 29 nodes do not have access to ...
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1
answer
2k
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How to ping a vm on a machine from a vm on another machine?
I have 2 centos 7 VMs on my laptop. They can ping each other and the host. However, I am unable to ping a VM on another laptop.
1
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0
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1k
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Centos cURL connection refused on Its own IP
I have two services on one server (with different ports to access them).
One of my services is trying to connect to the other one with the IP of server and its specific port. But I got some errors ...
1
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0
answers
784
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OpenSSL with added CA certificate on CentOS
So the problem is: I'm trying to add CA certificate on CentOS (on server) and check the working of SSL of one of my clients domain.
The same thing works perfectly on Ubuntu:
How do you add a ...
1
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1
answer
2k
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yum install updates up to a specific date
Is there a way to run yum update, but have it only install packages up to a certain date?
An update that took place overnight (as it does everynight), caused issues, and now after reloading CentOS, I ...
1
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0
answers
144
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X forwarding freeze after source server is restarted by watchdog
I am currently working on an issue with the Xforwarding of a QT application over lan.
Our source server is forwarding the interface of our application using the command "screen -dm" to a client ...
1
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1
answer
2k
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CentOS 6.7 configure: error: dlopen not found
I'm trying to configure LibreOffice On-Line WebSocket server before installing but the following error is thrown:
configure: error: dlopen not found
Full output:
[root@SBX-EXT-001-002 loolwsd]# ./...
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1
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96
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How to copy file only if file sizes between src/dst differ?
I wish to perform a file copy like:
cp --verbose /srcfile /dstfile
But I only wish to perform the copy if dstfile does not exist or if the dstfile filesize differ from the filesize of srcfile.
How ...
1
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1
answer
1k
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One user, multiple desktops tigerVNC
I was wondering if there was a way to "share" a user through tigervnc such that if both are logged in, both see their own desktops.
I need something similar to screen in ssh.
I've tried connecting ...
1
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0
answers
66
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My old CentOS 6 computer died. How do I make a new one boot with the old HDDs?
As the title says, I have had a CentOS 6 box for some years, but recently it died. Since it was quite old, I've upgraded it with a whole new box (new psu, motherboard, RAM, CPU), but kept the HDDs. My ...