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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Why does VLC depend on Visual Studio Code?

I am trying to install VLC on Centos 7. However when I go to install via these instructions it thinks Visual Studio Code Insiders is a dependency and wants to install it. I do use Visual Studio Code ...
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How do I verify clonezilla backup

I backed up a disk of centos-7 pc using clonezilla over the weekend. I let the pc reboot after the process, so it could be remotely accessed afterwards. That means that temporary log clonezilla files ...
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I got this error while checking reverse lookup file. How can I fix it?

I got this error while checking reverse lookup file. How can I fix it?
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How to gracefully shut down a Docker container

I have a docker container running CentOS 7. It is running a script wrapper_script.sh as PID 1. It also has below in the docker compose. CMD ["/wrapper_script.sh"] I tried docker stop on the ...
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Tomcat running on CentOS being killed

I'm running Tomcat 9 on CentOS 7 and Tomcat is being killed and I can't find any logs indicating why. In the past, it was being killed due to being out of memory. Unfortunately, I can't remember where ...
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Certbot fails to start nginx

I am using kernel 3.10 on CentOS 7. I have successfully installed CertBot 1.10.1 using alternative installation instructions as certbot-auto. I have manually added certbot-auto to autorun via systemd ...
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centos7 bonding issue - no arp table, duplex and speed unknown

I got two physical servers with two bonds on each server. bond0 is up and pingable. bond1 is up, but not pingable on both servers which are on the same network. Here are some troubleshooting I did - [...
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ssh gives 'Permission Denied' on valid username/password credentials (ssh set to accept password log in)

I have a strange issue on a CentOS 7 machine. If I login from the console, as two different usernames, I'm able to log in. However, when I try that same username/password combinations, I get ...
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Command to show historical swap usage by process?

I know I can see swap usage for a whole day using sar, but is there a way on CentOS to show swap usage per process for a specific day & time, highlighting a jump in usage, the PID etc?
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AWS CentOS 7 partitioning root folder to smaller directories

we have created a CentOS 7 VM on AWS and I am trying to partition the storage. We have a total of 200GB on the server and I want it divided into the following partitions and its mount points: root - ...
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EPSON TM-T88V prints very slow with CUPS on CENTOS

I recently updated from Centos 6 to Centos 7 and also had to update the EPSON driver for CUPS: Old driver: TM/BA Series Printer Driver for Linux version 2.0.0 New driver: TM Series Printer Driver for ...
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CentOS 7 | devtoolset-9 | compiling 32-bit apps

I have a very large FORTRAN program I'm trying to get compiled (using gfortran) as a 32-bit executable. I'm running a CentOS 7 box, with devtoolset-9 installed (gfotran 9.3.1). 64-bit compilations of ...
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How to fix Win10 mbr with multiboot Linuxes

I believe my desktop is screwed.... I happened to buy a new desktop online with Win10 Pro pre-installed. Got it home finally and decided to use attempt to have Linux installed with existing OS. I ...
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What could be a list of important configuration files and logs file on a Linux system that deserve to be monitored by a SIEM? [closed]

I am not a system engineer and not a security expert (I am more a software developer) but I am working on a project related to a SIEM installation (Wazuh). At the moment this installation have only a ...
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How to Partition a Single HDD With Hardware RAID 0

I have one SSD and one 10TB HDD. All the OS stuffs (e.g. /, /root, /var, /usr, etc) are on the SSD. And for a very dumb reason, I have to attach the 10TB to a RAID card (LSI MegaRAID SAS 9260-8i). ...
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firewalld failed since installing docker

Firewalld has been writing the following errors in the logs since installing Docker: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w10 -t filter -F DOCKER' failed: iptables: No chain/target/match by ...
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How to correctly enable a service on a CentOs 7 machine using systemctl enable command?

I am not a sysadministrator (I am a software developer) but this time I have to install some agents on some CentOS machines that have to be monitored by Wazuh (a SIEM software) and I have the ...
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Domain search entries in resolv.conf and ifcfg-ens33 files

In CentOS, when we modify /etc/sysconfig/network-scripts/ifcfg-ens33 file for multiple domain search entries, should we also manually change /etc/resolv.conf ? There are search entries in resolv.conf ...
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No route to host error trying a Telnet connection from a CentOS 7 machine to another CentOS 7 machine on the same network. Why?

I am not sysadmin\network admin (I am a software developer) and I have the following problem. I have two CentOS 7 machines on a same VLAN (on the external network firewall there are not blocking rules ...
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cryptsetup 2.3.4 rpm for CentOS 7?

I have been searching for cryptsetup 2.3.4 as I want to use --perf-no_read_workqueue. According to the release note, the option is newly added in 2.3.4. However, my CentOS 7's official repository only ...
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CentOS 7 Kickstart runs Yum, fails to install supplemental RPMs from local repo on ISO image

TLDR; how to get Yum to install RPMs from a local repo in a kickstart script, without a working network? I duplicated the CentOS 7 minimal installation ISO image and verified that I can fresh install ...
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Cannot sign in to VNCServer with Home subscription on CentOS 7

I cannot for the life of me figure out how to sign in with my RealVNC account on Linux. Whenever I execute vncserver it prompts me to run vnclicense to license the program, but I do not have an ...
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Why ConnectionRefusedError: [Errno 111] Connection refused on my server but not on my PC

When I try to connect by ftp command I have the following: 230 OK. Current restricted directory is / Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 227 Entering Passive ...
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How can I enable SSH login for this brand new user created on CentOS 7 machine?

I am not a sysadmin (I am s software developer) and I am finding the following difficulty working on a Linux CentOS 7 remote machine of a customer. I am using MobaxTerm to connect to this machine. ...
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Cannot Detect CPU Temperature?

# sensors-detect # sensors-detect revision 3.4.0-8 (2016-06-01) # System: Supermicro Super Server [0123456789] # Board: Supermicro H11DSi # Kernel: 3.10.0-1160.15.2.el7.x86_64 x86_64 # Processor: AMD ...
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One of the configured repositories failed (centos-7 - media)

I just installed centos-7 on VMware. While trying to run the command yum update it gives me an error saying, one of the configured repositories failed (centos-7 - media) I tried all the possible ...
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Edit a RHEL/CentOS kickstart file prior to booting?

I have a CentOS 7 installation boot disk that has been modified with a custom Kickstart file. The intent is to use this disk for unattended installations of the OS. I've found that on a particular ...
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Just installed CentOS 7, not sure which software option to select

A bit of background: I installed CentOS 7 on a x3850 x5 server I plan to use to run some fairly hefty simulations (OpenMC, Serpent). Bascially, these simulations will use around 32 GB of RAM and all ...
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SSH intense tunneling causes sshd service to close the connection, while manually running /usr/sbin/sshd doesn't

SSH server runs Centos 7, and I'm connecting to it from Windows 10, via Putty. I had to workaround some VPN settings, so a great number of SSH tunnels are set (something like 2000 combinations among ...
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How to stop NetworkManager from adding connections on boot?

NetworkManager has me struggeling with an easy task, setting a static network configuration. Disabling NM does keep the configuration stable and working, but I really want to know what is happening ...
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ffmpeg Unknown encoder 'libopus' centos7

I am new to centos7. I installed the FFmpeg for converting mp3 files to opus (Telegram Bot). However, I tried many ways to install it, every time I got the same errors! For example, I used these ...
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Docker installation fails on CentOS 7.4

Installing docker on Centos 7.4 fails. i ran the command to install some dependencies : # yum install device-mapper-persistent-data lvm2 And i got the result : Error: Package: 7:device-mapper-event-1....
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XRDP remote connection fails (Cenots 7 GNOME) from Windows 10 with no error message

I have been using XRDP to connect Linux Centos 7 (GNOME) for a long time from windows 10. But today suddenly I couldn't connect to one of my Linux stations. When I type username and password(...
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Centos 7 Apache web server not using the new document root directory

I have installed apache web server on my Centos 7, and I have enabled mod_ssl for it. But when I try to change its default document root to a new one (for example /home/user/public_html), it shows me ...
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Centos 7 Booting from Hard Disk… . error: unknown filesystem. Entering rescue mode

my server that I use for my website has failed and when I reboot I get the following error. I tried to solve it with Centos 7 iso file, but I was not successful. How can I solve this problem? Booting ...
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qemu networking Centos 7 host

I would like to do the same as in VBox whit the bridged network interface in Qemu and I'm trying to bridge the eth0 device from the host but what i get it's a bridge in the host, like ! my ethernet ...
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VPN blocking internet access on my CentOS

I am using CentOS 7 and for some projects I need to connect on a FortiClient VPN. It seems that the configuration of the VPN is blocking my machine to have any internet access other than the VPN. I ...
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Can we maintain logs of google authenticator secret key change?

I am using google authenticator in a freeradius server for two-factor authentication. Inside a user's home directory, I run the command "google-authenticator" to generate a secret key. What ...
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All chrome pages frozen unless I use the `--no-sandbox` flag

On my centos-7 laptop, unless I open chrome with the --no-sandbox flag, every tab gets frozen as soon as it opens. I can't even interact with the settings page. Diagnostics thus far: It used to work. ...
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Source bash script in modulefile with environment-modules version 3.2.10

I'm trying to source a bash script as part of a module load in CentOS 7, using the default environment-modules package (version 3.2.10), example as follows: #%Module1.0#################################...
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How to create unix socket

I am installing HAProxy from source. My example conf file tries to configure a socket stats socket /var/lib/haproxy/stats level admin How can I create such a socket? I'm on CentOS 7.
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iptables not filtering after applying rules to KVM based virtual machine

I am following this serverfault post as I want the guest Centos7 Virtual Machine to access the internet but have no access to any LAN network. My Host machine is Red Hat 7. Here is the output of ...
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How to change ovh custom kernel to stock centos7 kernel

I did try to search for an answer but was not able to find anything about changing the ovh custom kernel to stock kernel for CentOS7. I found how with ubuntu but not CentOS7. Any help would be much ...
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Port forwarding not working with iptables

I use a CentOS 7 as a gateway server. It has two network interfaces, ens28 and ens29. The ens28 uses a private 192.168.x.x network, it is considered as the WAN. Ens29 is the LAN area with a 172.16.0.0 ...
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Why is rsync crashing when I specify -X?

Can anyone explain why rsync is crashing when I use rsync -X to try copying an XFS file with extended attributes from a CentOS 7 system to a macOS Catalina one, along with the following debugging ...
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Yum crashed and Gnome desktop is disappear and unable to use yum now

I am using centOS7 and i was doing the yum update and my electricity went out and PC crashed. When I restart it only terminal appeared with command line. I tried to yum update again but am getting the ...
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I added a user named Abc09$FtpU88F on a Centos 7 VM. But /etc/passwd is showing username Abc09 only. What did it do?

Environment: CentOS 7 Problem: I used the useradd command: useradd Abc09$FtpU88F And when I checked using "cat /etc/passwd", it is showing me only part before $ sign in the passwd list. How ...
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Cronjob is not executing

How can we restart a server weekly as i am trying to write a cronjob by using crontab -e 00 10 * * * root /sbin/shutdown -r now and used this type of method by calling script 23 12 * * * root /home/...
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qt.qpa.screen: QXcbConnection: Could not connect to display

Cannot get CutyCapt to work. I am running this on a CentOS 7 VM. I am running this directly on the command line and not using a script yet. # echo $DISPLAY :0 # CutyCapt --url=https://hostname/abc --...
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on our prod server we have a UI which has a search engine

we recently encountered high CPU usage for 2 applications(i.e one app used 900%cpu and second app used 700% cpu) in our prod server and also noticed high load average of 22, 17, 10 so we have ...

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