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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CentOS 7 to Windows, can list smb shares but cannot mount

I have been asked to check the mount a windows share on a CentOs7 box, before it was working and now not working anymore (no clue from the customer on what could be changed) Local mount point /backup ...
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Is it possible to grand SSH access (using username and password) to a Centos 7 machine configured with an user using private key to connect?

first of all I am not a system engineer (I am mainly a software developer). I am working on a Centos 7 machine and I have the following doubt. Using MobaxTerm client I can access to this machine via ...
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Adding OpenGL support to a Docker distributed program

I am working with a piece of software, OpenFOAM, which is distributed on Linux under the Docker framework. It has a GUI environment, ParaView, that ideally runs on hardware accelerated graphics. I ...
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CentOS/RHEL: How to disconnect established connection and prevent subsequent connections until reboot?

I'm trying to test a system that uses multiple interconnected hosts, with one of the hosts randomly selected as the leader and the others being members. The members connect to the leader on a specific ...
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Installing Microsoft Teams for Linux

I am looking for any way to get Teams working on my Linux installation. It is CentOS 7, with Vivaldi and Firefox. I have tried both the .rpm and the .deb files but discovered that an update to Teams ...
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CentOS 7 minimal doesn’t get an IP address

I have created a small closed cluster system running on centos 7 minimal and not connected to outside. I have connected all the nodes via a switch. On startup, node gets IP but a couple of seconds ...
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SOLVED: cpanel/WHM cannot terminate accounts beacuse of /etc/shadow

i couldn't find the answer after searching. when i try to terminate an account in my WHM, I face the below error API failure: (XID sngjqn) The system failed to lock the append-only (+a) file “/etc/...
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How can I check if firewall is blocking ping from machine belonging to a specific subnet on Linux CentOS7?

I am not a system engineer (I am a software developer) and I have the following problem. I have this Linux CentOS 7 server. A collegue told me that he can't ping this server from some specific machine ...
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CentOS stops right after selecting kernel when installing CentOS on VirtualBox using Vagrant and Windows 11 Host OS

I have the following setup: Host OS: Windows 11 Enterprise Versio10.0.2 2000 Build 22000 Vagrant version 2.2.19 Oracle virtualbox version 6.1.32 If I try to start a CentOS 7 VM config like: Vagrant....
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Tomcat looking for the classpath in the wrong place

I have installed tomcat 9 on CentOS 7, location is /opt/tomcat. It works. But when I wanted to shut it down and to start it again when I used shutdown.sh in my /opt/tomcat/bin folder, I got the error: ...
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How to map /usr/bin/pdftotext to another path?

I recently installed the poppler-utils: sudo yum -y install poppler-utils I did this so I can get pdftotext but when I run pdftotext, I get this: pdftotext version 0.26.5 Copyright 2005-2014 The ...
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Import WSL distro directly from file system (without exporting)

I have had a Centos7 distro on my windows Machine (with file system of this distro on D: drive). I had to reinstall my OS and now i can't export that centos distro (Its rootfs is safe on D: drive). ...
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Intel NIC not found on ProLiant CentOS 7 install

I am trying to install a CentOS 7 distribution on an HPE ProLiant DL360 Gen10 server. Installed is an Intel X520 2P 10GB NIC in a PCIe slot. On the CentOS Installation screen, in the Network & ...
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How can I get my CPU to run at maximum speed by circumventing CPU scaling?

I am running CentOS 7 (7.9.2009) (kernel 3.10.0-1160.49.1.el7.x86_64) on a rather old laptop (Lenove T61) with a dual core CPU (Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz). The driver for CPU scaling ...
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centos 7 merge sda1 and sdb1

In my CentOS 7 server, there is one disk and one partition (sda, sda1) . now it is full, i asked from server provider to add new disk (sdb) then i created a partition sdb1 with LVM type . how can i ...
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CentOS 7 won't boot after installing AMDGPU-Pro Driver

So I recently partitioned my computer to install CentOS 7 in it for project. My original operating system is windows 10, and after partitioning, I could not access windows anymore from the Grub menu. ...
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Error unpacking rpm package

I have upgraded just before my centos 7 to centos 8. after a few hours of effort with the guide, I was upgraded. now I am trying to use yum for a couple of dependencies. as I have removed yum I am ...
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Get difference between two virtual machine qcow2 files

I have 2 qcow2 files based off the same .img file created with qemu-img. The guest OS is CentOS 7 and host is Rocky Linux 8. I'd like to get the changes in the file system between the images and I ...
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How to see the bottom Task Bar in Virtual Machine Manager virtual machine?

Virtual Machine Manager 2.2.1 Powered by libvirt https://virt-manager.org/ Copyright (C) 2006-2019 Red Hat Inc. CentOS 7 GNOME3 Hi, I'm running Redhat 8 with the above virtual machine software. ...
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Enable basic authentication on Kong API Gateway

I have succeeded to install Kong API gateway with Cassandra DB (native, not by docker). Now I want to enable basic authentication for Kong API like this: I have followed this step Step 1: Create ...
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Installed Open DCV server on a centos host but my client is getting "Unable to connect: network error"

I installed nice-dcv-2021.2-11445-el7-x86_64 server on a centos 7.9 host. I shut the firewall off to get it out of the way and client is "Unable to connect: network error" The system is also ...
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Cannot get IP on cloned VM LINUX7,8

I have cloned a virtual machine running RHEL 7 and 8. I am not getting an ip address After cloning the virtual machine, networking no longer functions. The ifconfig command does not show the network ...
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Access VMWare running ESXi VM from network

To preface this I am a Software Engineer and have so little knowledge when it comes to networking. I have ESXi running on a VMWare VM on my CentOS 7 server. I also have the Atlassian suite running on ...
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vncserver command is not creating port in CentOS 7 ( It is getting killed immediately )

While executing vncserver command getting below output but, no port is listing while trying vncserver -list command. [user1@localhost ~]$ vncserver New 'localhost.localdomain:55 (user1)' desktop is ...
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Error trying to deploy a Java application on a poor resource server: java.lang.OutOfMemoryError: unable to create native thread

I am not a system engineer (I am a software developer) and I am finding the following problem trying to deploy a Java application on a CentOS 7 production server. Basically running my java application ...
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2 answers
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Why can't I use the sudo command with this user?

I am not a system engineer (I am more a software developer). I have the following problem trying to deploy an application on a Linux Centos system. As the first operation, I need to install Java and ...
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mount lvm partition with replicated lvpath on centos7

I tried mount a disk on centos7 which also contains centos7. I read instruction like https://www.cyberciti.biz/faq/linux-mount-an-lvm-volume-partition-command/ But I found the replicated lvpath,which ...
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wget timeout on Let'Encrypt certificate server

I'am on a CentOS server trying to understand why I cannot connect to another website that is exposing a Let'sEncrypt R3 issued certificate. # cat /etc/centos-release CentOS Linux release 7.9.2009 (...
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Use Site A IP prefix at Site B

I'm currently has two VMs and installed CentOS 7. These are configuration (All IP address is not real, just for easy reading) Machine A : Has public IP 61.75.1.201/32 Announcing IP prefix 112.213.1....
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DNS Error : extra input text

I am configuring my private DNS server. When I reached the Check BIND Configuration Syntax step, I got some errors. Here is the my Forward Zone File : $ORIGIN esprit1.com. $TTL 86400 @ IN ...
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How can I recover my data after I changed formatting type?

To better explain what is wrong now with my harddisk let me tell you the series of events: I was trying to expand a CentOS root partition. In order to do that I first tried to unmount and remove the ...
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How to recover my libstdc++ in /usr/lib64

I was playing with a C++ program in CentOS7 and because of some problems my application was facing, I had to temporarily rename the /usr/lib64/libstdc++.so file into /usr/lib64/_libstdc++.so. But ...
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Unable to launch any container on CentOS

I am new using Docker. I want to install docker-ce on a CentOS Linux host. When I tried to run my container doing: docker run -it hello-world I got this error: mounting "/var/lib/docker/...
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Is Fusion free-evaluation license valid only on one system?

I'd like to evaluate CentOS 7 and 8 with VMware Fusion on Macbooks. Is the 30 days license good only for one machine, or could I use the same license on multiple machines?
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centos7 crash when systemctl start docker successed

[phenomenon] 1、I enter the command systemctl start docker from centos7, the centos7 crashed after docker successfully started.(It's reproducible) 2、Docker used to be available until I ran 3 ZooKeeper. ...
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GCP CentOS 7 - Root account getting locked upon reboot

I am facing a strange issue with my CentOS VMs hosted on GCP. Whenever I reboot the VM after some time it was built. The root account is getting locked automatically. I checked the root user attribute....
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How can i set new user home root path without permission of getting path 'backwards' on Centos 7

I created a new user "newuser2" as below with /home as a root but this user can still browse "backwards" into the system. adduser --home /home/newuser2 newuser2 How can i allow ...
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How to auto open virtual Terminal and excute the commad in the terminal using Crontab

I want to ask about how we can auto open the virtual terminal and run a command in that opened terminal on centos 7 via Crontab. If cannot auto open, so can we run and display the command in the ...
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RP-PPPoE in Kernel Mode Cannot Access Certain Websites

I have been using RP-PPPoE to dial-up my ISP on CentOS 7 minimal, however, the pppoe process have taken much of my CPU and might hangup my PC once a while. Decided to go with kernel mode by appending: ...
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How can I correctly install visual studio code on CentOS 7?

There are two approaches that I have tried to install visual studio code on my CentOS 7 system. Both have failed. Approach 1 - Following official instructions (install via package manager) The ...
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Yum troubleshooting dependency error

I have an updated CENTOS 7 distribution I built a local repo for using createrepo. It installs and operates fine but when I try to yum update it, I'm getting a dependency error. My interpretation of ...
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Trying to run two SSL vhosts on two ports on the same server (Apache 2.4.6 on Centos)

I want to run two sites on the same server, both SSL, one on port 443, one on port 4444. I have edited the vhosts-ssl.conf to have: Listen <IP address>:443 https Listen <IP address>:4444 ...
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How to run Blender on Linux from command line without admin permissions from command line?

I am trying to make a render farm on CentOS 7, which will probably be slow, but it will be working 7/24, and I want to use my university's remote server for that purpose. I have no admin permissions, ...
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Unable to login on LDAP client machine after user creation on LDAP server

We have configured LDAP client (CentOS 7) to an LDAP server (CentOS 7) We created users on the LDAP server and have authenticated LDAP client to LDAP server. We have Setup up Ldap server with below ...
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How to install and use network attached printer in CentOS 7

I have a printer on my local network that I can add to CentOS, but print jobs just spool forever, stuck in 'processing'. Not even the test page will print. Initially I had to disable the firewall and ...
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How to enlargen a specific partition in Centos7 with several partitions

My /home directory quickly runs out of disk space, so I want to expand it from 32GB to 64GB. [me@centos7 ~]$ df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 7....
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How can I stop\start Tomcat service installed on this CentOS 7 machine?

I am not so into system administration (I am more a software developer) and I have the following problem. A client give me a Centos 7 machine where Tomcat is up and running. If I open http://SERVER_IP:...
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1 vote
1 answer
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Trigger shell script execution by a POST request

There is a CentOS 7 machine and a BASH script in it. This script is being executed either by Cron scheduler or manually when I log on to the server via SSH. I would like to trigger script execution ...
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Cannot copy text in tmux mode in CentOS 7

Do you know how I can copy text in tmux mode in CentOS 7? When I select the text, it shows as yellow but cannot copy it. This is what I have in tmux.conf: If I press shift while selecting, it will ...
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So I've installed Signal Messenger on CentOS using Snap, now how do I start it?

I have snap installed in my CentOS 7 installation. With it I have installed Signal Messenger. However no icon appears for the program and running signal at the terminal finds no application. How do I ...
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