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Questions tagged [centos-7]

Version 7 of CentOS Linux distribution. The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).

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Linux mail server on Microsoft Azure Cloud not receiving mails [on hold]

So I'm currently learning linux system administration at my college and whenever I have extra time I spend it learning how to set up server on cloud, since I'm student my college provided me a MS ...
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Migrating CentOS to Hyper-V fails to boot GNOME

Centos Version: 7.5.1804 Kernel: 3.10.0-862.14.4.el7.x86_64 I have prepared a CentOS VM using virtual box on an internet connected machine and imported it onto a network without internet connectivity....
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CentOS 7 Samba Shares accessible from Windows VM (using lidarr,radarr,sonarr)

I have just setup a new server and I am trying to get something working properly and I can't seem to. I have my server running CentOS7, its got 6-4tb drives in a ZFS pool that I need to be able to ...
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How to make a desktop icon on centos 7 a trusted app?

I am fairly new to Linux. I have successfully created a desktop shortcut using the method where you create a new .desktop file and add in the information. The issue I'd like to overcome is that ...
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39 views

Unable to connect internet in bridge mode in vmware

I am trying to install CentOS 7 minimal in VMWare, but when I tried to connect Internet during the installation in bridged mode, it refused to connected and, after few seconds, it automatically ...
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Why is the VmRSS reported inconsistent when using mmap?

One application that we have combines two elements: it allocates a 707 MB memory segment using mmap(0, sizeof(T), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB, -1, 0). it reports ...
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Zipping directory while files are add

Sorry for the silly question but I cant find anything online about this. Lets say I have a directory ~100GB and I execute tar -cvf mydirectory.tar /mydirectory Zipping the directory might take ~15 ...
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Unable to connect to vsftpd instance managed by xinetd on Centos 7

I am attempting to run an instance of vsftpd and have additional access controls and logging performed by xinetd. On the VM running both services, I can successfully initiate a ftp connection and ...
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57 views

CentOS 7 Cannot find a valid baseurl for repo: base/7/x86_64 When yum update

This error is driving me crazy, I have been trying everything posted in the forums and nothing works. When I Type: # yum update I get the following error: [root@www yum.repos.d]# yum update ...
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CentOS 7 is not logging to files anymore

my CentOS 7 Server is not logging to messages or maillog anymore? Restarted rsyslog and systemd-journald - nothing changed - both services are running. Hope someone could help me what to check.
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487 views

Failed to install cuda on centos 7

Following the instructions to install the cuda found here: https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html e.g. $ sudo yum groupinstall "Development tools" $ sudo yum install ...
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Is fifo pipe size limited by disk cache allocated space?

On Linux CentOS 7 I am using named fifo pipes created with mkfifo to handle data passing between pairs of processes running on a multiprocessor disk server (Dell R730xd with 132GB RAM and 20TB RAID ...
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1answer
55 views

Redirect subdomain to Docker container using NGINX

I have NGINX set up on Centos 7.5, listening on port 80, and directing the traffic to a Gunicorn server. That is the main purpose of this server, and these are are locally installed applications, no ...
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Centos7 routing table configuration

I would like to change the following route table : Press here to see route table [root@clearsee-bi-primary network-scripts]# route -n Kernel IP routing table Destination Gateway Genmask ...
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15 views

ReadOnly overlayfs from multiple NFS mounts

I am trying to use overlayfs to overlay multiple nfs mountpoints. Since I only need read-only access, I did not include the upperdir and workdir options. My command looked like: mount -t overlay ...
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1answer
26 views

How to run a bash script automatically at gnome login

I want to use Gnome's inbuilt Screen Recorder for recording GUI sessions for audit purpose. To automate this, I changed the Shortcut for the screen recorder as "Alt+U" and then executed command "...
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28 views

selinux preventing PHP/Roundcube from connecting to local SMTP or IMAP ports

EDIT: I've determined the cause is selinux. After disabling enforcement with setenforce 0 everything worked. So the new question is, what's going on with selinux? I only have default CentOS 7 policies....
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trace-cmd.service Slowing Down Bootup?

I installed trace-cmd.x86 package on CentOS 7 because I was planning to trace some latency issue in my application. But then, I noticed once awhile, the boot up time took like 2+ mins. Then, I ...
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VirtualBox: Creating isolated web server accessible from internet with restricted access on LAN

I am sure this question has been answered before, but I can't seem to find a workable answer. I have a CentOS 7 virtual machine running inside VirtualBox 5.2.20 hosted on a Windows 10 Pro computer. I ...
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CentOS 7 - Keyboard Settings won't apply, to allow the locking of a user session

I'm currently unable to cause the computer to lock as per using the Windows+L key combination on a Windows system. Going to Applications > System Tools > Devices > Keyboard shows the keyboard ...
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1answer
36 views

adding path to centos 7 using ssh

I am migrating from ubuntu to centos and am in the process of setting up the centos server'. I am trying to add an executable to path and having difficulty. Issh` into the server as root build and ...
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28 views

configure SFTP server with 2 nics

Centos7, dual NIC setup (one IP on 192.x the other on 10.x) I drew a diagram to help me explain what i want to accomplish I want to enable SFTP from the outside and enable SSH from the inside to ...
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1answer
64 views

RAID 5 Windows 10 Host OS Running CentOS-Linux in VirtualBox

This is my first time using a Virtual Machine so please forgive my ignorance. My computer is running Windows 10 and then in VirtualBox I'm running CentOS. I have 3 new 1TB HDDs. I want to run the 3 ...
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Headless CentOS 7 on iDRAC: eject commands (specifically -t) fail to close dvd tray

We're doing a lot of experimentation with a sever environment that has required several consecutive wipe/reinstall of CentOS 7. It's a headless, rack-mount server, and we're installing from a DVD. It'...
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1answer
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Install Docker from a DVD no network connection

I am trying to find a way to install docker-ce on a CentOS box with no internet connection (government box). I have gone down the dependency hole years ago while trying to install another package so ...
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Oracle vm Box - Cent OS 7 - WordPress Server - ERR_SOCKET_NOT_CONNECTED

I have Installed Oracle VM Box on my Windows 10. I have Installed CentOS 7 in the box. I have exposed apache to the windows and It is working fine. When I tried to expose the wordpress server at 8080, ...
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How can I forward traffic to a natted kvm guest when clients connect to the host with firewalld?

I have one CentOS 7 kvm guest at 192.168.122.7. For troubleshooting purposes, selinux is off. There is an application listening on port 9000, and port 9000/tcp is open on the firewall on the guest and ...
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Windows Oracle VM Box - Cent OS7

I have a windows 10 machine, Oracle VM Box Installed. In that, I have installed the CentOS 7.1. I have successfully configured the network and winscp is working, Inside the VM, ping command is working....
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Unable to update yum packages using CentOS 7.5

I have been getting the following error while updating yum packages. http://mirror.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno -1] Error importing repomd.xml for base: Damaged repomd....
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1answer
127 views

GrubX64.efi not found error

Facing grubX64.efi not found with UEFI boot install. I am using rufus to convert it to usb and the strange part is, EFI folder(iso) has the following files: "BOOTIA32.EFI,BOOTX64.EFI,fonts,grub.cfg,...
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304 views

“”ping 8.8.8.8 connect: Network is unreachable“” in centOS 7 on VMware workstation 14

I am trying to work with centOS 7 which I installed on VMware workstation. But it doesn't have internet connection: $ ping 8.8.8.8 connect: Network is unreachable $ ping www.google.com ping: www....
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Getting only “|” symbol printed all over my console, after booting CentOS 7

I am getting | printed all over the console after I boot up. I am using CentOS 7. Can someone help, how to get over this, and why I am getting this:
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Disabling Network Manager in CentOS 7 and enabling network.service causes 'Network is unreachable' error

I installed CentOS 7 using the minimal ISO on my Proxmox VPS, configured my ifcfg-eth0 file. After that I was able to use yum update, ping 8.8.8.8, connect via SSH, etc. After following this guide to ...
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CentOS 7 vsftpd incorrect folder permissions

I'm faced with two issues right now. I cannot write to the /var/www/* folders and I am able to traverse backward into the /var and / root directory! I'm using vsftpd and in the config I'm using the ...
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Access files from Tomcat user

I have a nologin tomcat user with a home directory /opt/tomcat/ I want to be able to access files from my sudo user. I have tried using environment variables to point to the file and just tried to ...
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1answer
105 views

Information About Named Shared Memory in /dev/shm

Let's say I see a file called /dev/shm/some.segment How can I find out (with command lines): The processes that are linked to it? The NUMA node it locates? For #2, I can write a small C program ...
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46 views

use du to exclude mounted volumes but check root volume only

I am trying to check my disk usage, because my root volume is full. I'm on Centos 7.5. I thought that giving du the -x flag gets it to ignore mounted volumes. But when I check my disk usage on this ...
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How to get back windows 7 to grub2?

I had a HDD with windows 7. Then, I added 2ed HDD to install centos7. During installation process I chosed cent OS Auto partitioning but re-sized them quite. after installing cent OS 7 it didn't ...
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135 views

Network.service failed starting: No suitable device found

I recently installed Centos 7 minimal version on my Raspberry PI 3B+. Network seems to be working ( i am able to ssh to it), but network.service is failing to start. Below journalctl output: -- Unit ...
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46 views

ImportError: undefined symbol: GDALDatasetTestCapability when installing gdal2tiles on Linux Centos 7.5

How can I resolve this error? ImportError: /home/a/b.com/live-charts/live-chart-example/lib/python3.6/site-packages/osgeo/_gdal.cpython-36m-x86_64-linux-gnu.so: undefined symbol: ...
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40 views

Locked out while setting up nginx

It's my first time trying to setup a web server. I was trying to set up a Digital Ocean Droplet running CentOS. During nginx setup, I 'accidentally' changed the permission of '/' to the nginx user, ...
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60 views

Samba: max length of “write list” in smb.conf

I'm trying to reconfigure our samba systems so that the read list is always a group and the write list is a comma separated list of usernames (for various reasons). I can't find anywhere if there is ...
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0answers
31 views

ffmpeg: mix/merge multiple mp3 files, some do not mix

I am trying to merge multiple mp3 files on top of each other on a CentOS 7 server. I am trying with ffmpeg but I have mixed results. When mixing 4 files, the last one for example does not mix with ...
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1answer
67 views

VirtualBox CentOS 7 installation- why just command line, no desktop?

In one of my previous jobs, I used a number of Virtual Machines as part of the development process for our software (CentOS 5, CentOS 7 & Windows XP). The VMs were mainly used for hosting the back-...
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181 views

/usr/sbin/vbox-uninstall-guest-additions - uninstall.sh: No such file or directory

ISSUE I am using dotless' vbguest vagrant plugin to keep my Virtualbox guest additions updated. Trying to install guest additions now using $ vagrant vbguest --iso VBoxGuestAdditions_5.2.18.iso --...
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Prelude-manager service fails to start on CentOS7

I have recently installed and configure the Prelude framework in CentOS 7. However, after the configuration and a supposedly successful service start, once i run the systemctl status prelude-manager, ...
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1answer
19 views

Package not found by package manager (YUM)

I'm installing CentOS as a VM on VirtualBox. I've some problem with some package I want to install from RPF fusion repositories. I found VirtualBox-guest-additions-5.2.16-1.el7.x86_64 package ...
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2answers
31 views

OpenVPN Multiple Public Ips Config on CentOS 7

I currently have a cloud node on an online host and with 3 public ips assigned to a CentOS 7 instance. Is there a way to run an OpenVPN server listening on all 3 IPs? I do not need the instances to be ...
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Trying to pass parameters to a service started with systemd

I'm running on centOS 7, and I need to create a service that runs an executable that requires parameters. I created the unit file to look as follows: [Unit] Description=My Test Service After=network....
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1answer
177 views

Dropbox GUI not running on centos 7

I am trying to install dropbox on my centos 7 system with Gnome by running sudo rpm -ivh nautilus-dropbox-2015.10.28-1.fedora.x86_64.rpm I don't know how to start the GUI afterwards, and the icon in ...