Questions tagged [centos]

Questions specific to the CentOS Linux distribution. Use this tag if your question relates to how the CentOS distribution affects your problem; do not use it if you just happen to be using CentOS and your question is about a specific configuration detail or syntax.

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Failed to start Pulls alerts off of the sqlite queue on disk and sends them to rsyslog which forwards them to graylog

[root@sec-prod-app opt]# systemctl status model_breach_forwarder ● model_breach_forwarder.service - Pulls alerts off of the sqlite queue on disk and sends them to rsyslog which forwards them to ...
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25 views

how to use firewalld in stateful mode

I have to setup an stateful firewall on centos8 using firewalld. I'm new to firewalld but have experience with old style iptables for this purpose. since it is recommended by Redhat here, I prefer to ...
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Setting Preferred Applications from the terminal (CentOS 7)

I'm making a script which uses xfconf-query to change various system settings on mass, however I'm unsure how to set my Preferred Applications in the same manner. I looked into the mimeapps.list file ...
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Install new version of C-ares on Centos 7

I'm trying to install a more recent version of c-ares on a Centos 7 server. The repo only has 1.10. Any ideas other than upgrading to Centos 8 to get c-ares 1.13 ?
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Squid transparent proxy error

Im trying to configure squid transparent proxy on centos 8 and it give me error as below can someone have a look and tell me where im wrong . squid.conf # # Recommended minimum configuration: # # ...
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How to get epel-release / epel-release-next / powertools in CentOS Stream 9

I have recently installed CentOS Stream 9 and I'm finding that I can't get epel to work properly following any instructions I can find online. Resources for CentOS 8 / CentOS Stream 8 don't work and ...
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1answer
19 views

What's command line equivalent from gnome / centos8 "extract here"

I'm facing a curious enigma. I have a zip archive containing files whose filenames contains accented characters (é, à, è etc.) The "extract here" function from gnome file manager perfectly ...
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1answer
24 views

Creating XFCE4 Application Shortcuts from the terminal (CentOS)

I am trying to add a new application shortcut in the command line which will load the terminal when you press Ctrl + Alt + T. I am using the xfconf-query utility to monitor xfce4-keyboard-shortcuts ...
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1answer
12 views

Centos release 7.3.1611 Extend Swap partition from current 1GB to 2GB

Could someone who has a deep knowledge can try explain how to achieve and increase a swap memory from 1 to 2G? I'm running Centos on Oracle Virtualbox. After utilized a command lsblk : sda ...
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1answer
28 views

usage of system-uuid and/or product-uuid on centos 8

I moved this question to here, from stackoverflow Using dmidecode -s system-uuid I get answered /sys/firmware/dmi/tables/smbios_entry_point: Permission denied /dev/mem: Permission denied With sudo ...
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centOS after delete the user system not restart (login)

System only display the logo of centOS 6 not login. I simply create a new user and then delete the user and restart the system. I try to login with kernel single user and got below details how i can ...
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Yum gets broken in Centos 7 while being updated

I recently tried to update my Centos7. While being updated, I lost power and later on yum does not work. It looks like the script for yum and dependencies gets broken. I have tried couple of options ...
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Extend Disk Size of LVM

I have a LVM (/dev/data/files) with 170G which is currently on a Physical volume (/dev/sdb1) Here is the structure, shown by lsblk command lsblk sdb 8:16 0 220G 0 disk └─sdb1 ...
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Install KDE on CentOS 8

I'm trying to install KDE on CentOS 8 but I'm not able to. I recently had problems updating packages and run dnf --refresh --best --allowerasing update. This removed KDE an all related apps (yeah, I ...
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27 views

SSSD with LDAP authentication, old password works

My client is Centos 7 and the LDAP server is Active Directory (Windows 2008 R2). I'm using sssd in order to authenticate to my machine with LDAP users (ad). My problem is that I manage to connect with ...
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How to fix CVE-2021-43267 in centos 7

The latest official release of Linux kernel released by Centos is kernel-3.10.0-1160.45.1.el7.x86_64.rpm which is updated on 15th October 2021. Furthermore, the kernel version recommended by CVE-2021-...
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Create a Device Name for NetworK Manager, CentOS 7

I did an installation of CentOS 7 on top of a laptop, and the installation was unable to detect the network device at install time. I was able to find the network device upon boot through the ...
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38 views

File Permissions keep changing back

We have a cent os7 server that recently had a new user added. It seems that during this process permissions were wrongly updated. After I have fixed the permissions to suit the site required ...
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1answer
14 views

Error : Failed dependencies rpm

When I tried to install an rpm in my CentOS7.8 virtual box with this command: rpm -ivh cpp-4.8.5-44.el7.x86_64.rpm kernel-headers-3.10.0-1160.el7.x86_64.rpm glibc-headers-2.17-317.el7.x86_64.rpm glibc-...
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Missing serial ports (ttyS) on CentOS 7.9

I am trying to diagnose why one of my Linux PC's is not displaying the serial ports of my 8 Port RS232 PCIe card. The specific card I am using on both systems is the Startech PEX8S925. System One is ...
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16 views

since when CentOS has a welcome page with the default http server

On my network, I have many CentOS VMs with various versions dating from very recently to 10-15 years ago. For some of them I don't have credentials but I want to check if I should keep them by the ...
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21 views

I am using CentOS 7; I keep receiving a "boot almost full" warning. How do I resolve this?

root@localhost ~]# ls -l /boot/ total 369648 -rw-r--r--. 1 root root 153596 Oct 13 20:25 config-3.10.0-1160.45.1.el7.x86_64 -rw-r--r--. 1 root root 229187 Nov 2 15:45 config-5.10.75-200.el7....
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25 views

cant run react nginx on port 443 and 80 both are in used

I have react, nodejs app and dockerize them. frontend running with Nginx on port 80 and 443 on my local docker-machine. when I run the docker-compose command on my VPS centos it throws an error that ...
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25 views

Run mysql get code=exited, status=127

system:centos 7.2.1151 mysql:mysql-5.7.27-1 When MySQL is installed on the server, it cannot be started. There is only the error code code = exited, status = 127, and ,when I checked mysql.log and ...
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1answer
33 views

How to undo fdisk new partition on ext4 file system?

I have a LVM called /dev/data/files on a VM of mine. I allocated 50 GB on it and wanted to extend this LVM... So, instead of using lvextend command which i forgot to use i did the following: fdisk /...
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VNC: has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing

Trying to set up a VNCServer for first time and allow user netizen be able to log onto the server and we can work together. So looks like there is two exec starts here so do I need to remove one? [...
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14 views

segfaults in "d-anchor" process. What's that?

dmesg on one machine running Centos 8.1 shows regular segfaults in the "d-anchor" process. # uname -a Linux pelican64 4.18.0-147.el8.x86_64 #1 SMP Wed Dec 4 21:51:45 UTC 2019 x86_64 x86_64 ...
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24 views

Linux gcc make creates randomly unreadable folders

Recently i get some strange problems on compiling cmake linux project. The compiler creates folders at the CMakeFiles folder. But, some of those are created in write only mode "--w-------". ...
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1answer
158 views

HTTPD: What's Missing?

I am unable to get webpages past the default Apache Welcome screen. I am trying to get www.mybestfriendsarecats.com to publish. httpd -S provided error information in /etc/httpd/conf.d/mod_security, ...
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1answer
27 views

linux D state processes reboot still remain? how can i close it?

I have a 2cpu 4G server. Recently I found that the load is relatively high. I found a D states process after troubleshooting. I checked some information and said that only restarting can solve the ...
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45 views

dnf update not working in CentOS

Unable to run dnf update command in CentOS8. Below error occurred while, Failed to open log file: /var/log/hawkey.log.
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How do I auto-mount RAID5?

I am trying to automount md127 which is a Raid5 mdadm assembled. In /etc/fstab I have UUID=4ca9118c-3a55-7d0f-db72-3ff2e8b9a521 /tmp/DATACABINET however this makes OS boot into Emergency mode. When I ...
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version 'libcrypto.so.10' not found

I am trying to run an executable that makes use of the libcrypto and libsll libraries. When I run the executable I get the following error PROGRAM: error while loading shared libraries: libcrypto.so....
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23 views

User not getting forced to change password

Any one has idea why user don't get prompted to change password after running below command on user account chage -d 0 user
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1answer
38 views

When I boot in centOS 8 I get some sign on my screen

After I boot in my centOS 8 I get icon on display. And nothing is changed when I reboot my system. When I click on this "icon" - left click give nothing, right clik give me option to change ...
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37 views

How to make GRUB on HD boot a bootable USBDrive or from a `.iso` on USBDrive?

I'm currently struggling with a project where I need to make it boot from a bootable USBDrive using GRUB. (alternatively I could make a NTFS USBDrive with the raw .iso file) When I enter GRUB's ...
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1answer
33 views

Restoring /home/etc to /etc

I need to copy backup files from /mnt/backup/etc to /etc so cp/mnt/backup/etc* is the command I am thinking of. However, experience is teaching me cp/mnt/backup/etc* may be a destructive command to ...
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18 views

CentOS internet connectivity issue

I am using 2 systems with i5 processor and CentOS 7 operating system. I wanted to install Teamviewer hence upgraded the system with yum update One of the two systems is working fine. But another ...
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1answer
24 views

WHM / Rearrange an Account

I recently bought another block of storage from my provider and following their guide, I rearranged my accounts to it: sudo mkfs.ext4 /dev/vdb sudo mkdir /mnt/vol-us-1 sudo mount -t ext4 /dev/vdb /...
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24 views

Squid transparent proxy not intercepting

I have configured squid as transparent proxy on centos 8. squid is not intercepting or deploying here is below my configuration. # # Recommended minimum configuration: # # Example rule allowing ...
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1answer
16 views

Yum update - Could not resolve host

I am using a system with an i5 processor and CentOS 7 os. In order to setup a remote session with OEM for troubleshooting session, I wanted to install the TeamViewer application on my system. I ...
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1answer
34 views

How to get breeze-gtk on Centos8 / EPEL?

I installed KDE on Centos 8 but I can't find breeze-gtk in EPEL for Centos 8: https://pkgs.org/search/?q=breeze-gtk It seems to me like the EPEL maintainers simply forgot to include it. Is there a ...
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1answer
22 views

Logical volume not found in volume group

I need to increase the size of centos_s0106ac9e17b4312300-root I am trying sudo lvextend -L +10G /dev/mapper/centos_s0106ac9e17b4312300-rootJESSE but getting Logical volume rootJESSE not found in ...
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1answer
29 views

How to debug a CentOS weird networking issue

I have a CentOS 7 machine that is continuously copying data to AWS/S3. However, it has a problem, which I'd be grateful for suggestions on how to debug. The copy to S3 would go on for hours/days, and ...
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2answers
56 views

Forcing the use of sudo instead of running commands from a terminal as root

I edit my question to give the goal and not an assumption of the solution. RHEL based distributions The root user is never used and its password is kept secret All the commands run with sudo are ...
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1answer
157 views

Downloading packages: warning yum

after yum update Downloading packages: warning: /var/cache/yum/x86_64/7/centreon-stable-noarch/packages/centreon-plugins-sudoers-1.0.0-6.el7.centos.noarch.rpm: Header V4 RSA/SHA1 Signature, key ID ...
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11 views

Serial port baud rate change - getting "unable to perform all requested operation"

I´m working under CentOS 7 distribution, I have worked with USB to serial converters and everithing works properly, but in this case I´m using a Versalogic MPEe-U2 board attached to a mini PCIe ...
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2answers
45 views

selinux blocks ping from php exec

Apache server running Centos7. I'm trying to execute a ping from PHP's 'exec' command but get "socket: permission denied". It works with selinux disabled. My linux knowledge is somewhat ...
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36 views

postfix on centos 7 maildir delivery failed: create maildir file /home/testuser/Maildir/tmp/ : Permission denied

I'm trying to set up postfix on a centos 7 server. I've been following this toturial: https://netcorecloud.com/tutorials/install-centos-postfix/ Everything is looking correct and succesful, however I ...
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16 views

Arrow keys and backspace not operational on remote Vim

I've seen similar posts/articles about this but none of the solutions have been able to resolve my issue. When I SSH into any remote machine (primarily CentOS and Debian) and try to edit a file using ...

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