Questions tagged [centos]

Community ENTerprise Operating System; a Linux distribution based on Red Hat Enterprise Linux widely used on web servers.

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Deny port redirection based on source IP - firewalld

I'm trying to forward a port to an external IP using firewall-cmd, but I need to deny access from certain ips. To setup a port-forward of port 55500, I use: firewall-cmd --permanent --zone=public --...
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SSH JumpServer with ProxyJump and Signed SSH Keys by a Certificate Authority

I want to achieve the following: Connect from a Public SSH Server to a Private SSH Server via a Tunnel Ideally, this is done comfortably via the "ProxyJump" option for the SSH client I have the ...
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Keeping a few Linux machines at the same patch level

Is there some simple and straightforward say to keep a few Linux machines on the same patch level? I'd need this separately for a few Ubuntu, and a few CentOS 7 (actually Oracle Linux 7, but close ...
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Unable to boot into CentOS installed on external hard drive

I created a CentOS bootable disk for installing CentOS onto my external hard drive. I was successful on installing it onto a partition created for the same on the external hard drive, but when I tried ...
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Getting “already seen ipaddr” error when adding 2 secondary IPv6 addresses on a VLAN subinterface

How many secondary IPv6 addresses are allowed on a VLAN subinterface in CentOS 7? With the config below I only get the former IPv6 address successfully assiged to ens224.2015 while the latter IPv6 ...
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90 views

Can I limit the scope of ntop to only monitor a specific connection?

I need to be able to track client data usage between their VM and an S3 compatible object storage bucket (accessed via https). I've installed ntopng community edition on the VM and right now it's ...
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umask is 0002 but new file is 662, not 664

I am studying for my RHCSA. Currently learning about UMASK. The issue is that my umask is set to 0002, and I am logged in as a normal user, not root. When I create a dir, its correct, the dir gets ...
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21 views

Is it possible to re-install CentOS on a remote server?

I have bought a virtual private server with a default CentOS 7 installed upon. But I like to know is it possible for me to remove that OS and replace it with CentOS 8? The only way I have access t the ...
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Apache server on centos 8 not serving http pages

I have a CentOS 8 computer running an httpd server I was serving both http and https pages properly before I installed the live chat helper web based chat software using the instructions here: ...
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How to I delete live helper chat web based chat software?

I installed a web and php based chat software called live helper chat using this tutorial: https://devops.ionos.com/tutorials/how-to-install-live-helper-chat-on-centos-7/ in CentOS 8 I would like to ...
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Device multipath setup interferes with software RAID setups on CentOS

I'm using a default installation of CentOS (well, a subset really for oVirt nodes which, at least to me, seems to be the same for the "core part" of the system). It's running on a Supermicro server ...
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How many CPUS on my CentOS 7?

I have a Java program which runs quite fast on my local Mac and its info as below: Processor:2.4 GHz 8-Core Intel Core i9 Memory: 16 GB 2400 MHz DDR4 When I run the same program on a CentOs 7, it ...
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Mysql memory usage and processes

I found out that mysql (on Centos7) is taking up more and more memory, and from htop I see a single process with many threads, and my memory being ~550M/3G: 18895 mysql 20 0 1157M 173M ...
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How to make window maximum on VirtualBox and how to install KDE on CentOS 8.1?

Installed CentOS 8.1 on VirtualBox 6.1. Have installed Guest Additions(Devices -> Install Guest Additions CD image...) to CentOS, but after reboot, it still can't make maximum size. The second time ...
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How can I fix the search function bound to the windows key in gnome, centos 7 if it has disapeared?

Until about a week ago, pressing the windows key in centos 7 (gnome), would bring up a handy quick search, and task switcher. Now when I press it, I still see the task switcher, but search has ...
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How to setup shared folder in Virtual Box with Windows 10 as host and Centos guest

I added my Documents folder as a shared folder when I created the Centos Virtual Box image with the following settings: Folder path: C:\...(omitted on purpose ) Name: Documents(Windows) automount ...
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Fix scaling of Oracle VM VirtualBox Manager (not the Virtual Machine)

Before I can join the struggle to get the correct resolution for a Virtual Machine, the VirtualBox Manager itself doesn't look good enough to work with it, as you can see in this image. As you can ...
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How to disable Ctrl+Alt+Left/Right on KDE?

I need Ctrl+Alt+ (Left/Right) to be bound to IntelliJ IDEA but something is preventing the combination to reach IDEA. I searched everywhere but I only found information about Gnome and Ubuntu, I'm ...
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25 views

389 LDAP server login failed

I have followed this tutorial to set up 389 LDAP server on CentOS 7.8. Computer name [SE1]: ldap.sandbox.domain.eu Administration Domain [sandbox.domain.eu]: Suffix [dc=sandbox, dc=domain, dc=eu]: ...
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Pure-FTPd Hebrew characters

In the FTP protocol (Pure-FTPd), when I upload a file or rename the file to "בדיקה.txt" it looks fine. But when I use the SSH protocol, I see the file with the name "ᣩ��xt" instead of the original ...
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Risks while running an Apache web server on a centos 8 machine

I am trying to install Apache webserver on a Centos 8 machine using this tutorial: https://phoenixnap.com/kb/how-to-install-apache-centos-8 The network inside my room has the following ...
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Dedicated server: will switching from a HDDs to a SSDs reduce I/O usage?

I have a kind of video (mp4) hosting site. The last 2 years there were no problems with the site. But now I have encountered a problem with I/O usage: iotop command results I am currently using a ...
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Centos 7 noexec to be removed from /tmp - tried google tips no luck

I did: mount -o remount,exec /tmp still I see: mount |grep -i noexec|grep -i tmpfs tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) tmpfs on /tmp type tmpfs (rw,nosuid,nodev,...
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I don't get the ip adress of host

Hello I'm a web developer just starting with virtualization for a school project I have an public IP Adress that my teacher gived me to log using ssh I have root privilege Host: CentOs 8 Guest: ...
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50 views

Docker containers cannot resolve DNS

I just installed docker on CentOS 8. Everything went fine, I’ve run the hello_world test container and the result was successful. The issue is that inside the containers I cannot resolve any DNS ...
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32 views

Converting linux file to folder

On my CentOS , i was on the following directory:- /home/coolcatg and that directory contain a website folder named "public_html". I simply copied that folder to /home directory :- [root@server ...
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Dovecot 2.2 - can diffie-hellman params file be symlinked to pre-existing one?

I'm installing Dovecot 2.2 (limited to 2.2 in CentOS 8), on a VERY lightweight server (1GB RAM, 1 core). The problem I'm facing is that Dovecot insists on generating its own Diffie-Hellman parameters ...
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24 views

Getting correct PostgreSQL version on CentOS VM

I recently started a job as a PostgreSQL DBA and wanted to setup a virtual machine at home similar to what I'll be working with so I can start to play around with the system. I setup a CentOS 7 ...
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24 views

Specific user can't run Spring Boot application on port 443, but root can do it

I can't run a Spring Boot application on CentOS under a specific user on the port 443 (or 433 it doesn't matter). Caused by: java.net.SocketException: Permission denied Root can do it. When I tried ...
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23 views

Why does traceroute time out when I try it on certain hosts?

I have a large LAN set up with over 100 hosts. Most of the time traceroute works fine, but in certain cases between two particular hosts, it times out. I have tried the default traceroute as well ...
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cPanel Centos6.10 php install versus Centos 7.7 php install - mod/extension differences

GoDaddy is my hosting provider, I am in the process of upgrading from their Gen3 VPS to a Gen4 VPS. The Gen3 was on Centos 6.8 and the new Gen4 is on Centos 7.7. My original PHP install for apache ...
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19 views

Trying to load a different kernel on CentOS, but always the same one is loaded

I need to run a virtual machine inside a CentOS 7.7.1908 server. I only have access by SSH. I tried KVM, Virtualbox, OpenVz, Xen, but failed. All of them need to load a different kernel and I realized ...
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391 views

Problems installing Steam on CentOS 8 Stream

I'm having a problem installing Steam on CentOS 8 using RPMFusion repositories. [imptovskii@imptovskii-pc ~]$ sudo dnf install steam CentOS-8 - AppStream 7.6 kB/s | 4.3 kB ...
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28 views

Is there a way to configure traceroute such that the -T or -I flags do not require root privs to perform?

I am using Centos 7. Basically I just want any user to be able to do a ICMP or TCP traceroute. Is there a way to configure traceroute such that the -T or -I flags do not require root privilegess to ...
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16 views

centos strongswan routing issue from other network systems

In attached architecture, I am connected from one of the server in network to other network using strongswan (centos). When I ping 10.0.31.6 from 172.29.0.14 after establishing ipsec connecting, it ...
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28 views

How to load linux into ramdisk on boot?

On an old laptop (used for home server) I have a large amount of RAM (16 gb). I want to install linux (CentOS or Ubuntu Server) on a 8gb SD card but I want it to copy all partitions into ramdisk(s) ...
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CentOS 7 on VPS hosted - how to interact with notification

I would like to know if it's possible to receive/interact with notifications (the ones you receive with a desktop environment) in a no-gui environment ? Is that possible to install the dedicated ...
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17 views

Change where prtsc saves screenshots and how they are saved on Centos 8

When I hit the prt sc key my screenshots are saved in ~/Pictures as follows: [gothmog@centos8 Pictures]$ ls | head -n 5 Screenshot from 2020-04-16 17-19-54.png Screenshot from 2020-04-16 17-21-07.png ...
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Samba share on CentOS very slow over local network

I'm pretty sure I've traced this to a Samba performance problem, but unsure how to take it forward from here. Specs Server is CentOS 7.7.1908 running Samba 4.9.1-10 (updated yesterday). Server is ...
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43 views

VirtualBox Centos7 machine has no IP address when host is connected on WiFi instead of LAN

So I have a CentOS 7 (minimal inst) VM on VirtualBox with Bridged Adapter network configuration, on my laptop (host). Whenever I have my laptop (host) connected on WiFi, there is no IP address ...
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52 views

Unable to get keychain (funtoo) to work with Centos 6

I recently set up key based ssh authentication for my workstation to a test server I have. The key based authentication works fine and I am able to log in just by entering a passphrase. In a quest ...
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19 views

XenForo folder permission error

Recently I migrated my website from a server to another. The OS and the web server software are the same on both servers (Apache HTTPD on CentOS 7). When I transferred the forum I encountered a ...
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23 views

Centos 8 symlink to users's `.ssh` folder

I'm following this guide to setup some kind of ssh proxy for gitlab. this is how ti doesn't work When I create symlink like in that blog post I'm not able to ssh into server. This is how symlink is ...
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25 views

Cannot retrieve repository metadata (repomd.xml)

I recovered a old HP Proliant ML110 G5 server. I formatted the disks and I re-installed the operating system CentOS 5.11. When I try to install some programs or do other operation I often receive the ...
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17 views

CentOS TFTP server not answering request

I am trying to bring up a tftp-server on an Amazon EC2 instance running Amazon Linux (CentOS). I followed instruction I found online. http://wiki.r1soft.com/display/ServerBackup/Configure+a+TFTP+...
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Updating Samba on CentOS 5.4

We have a box running CentOS 5.4, with Samba 3.0.33-3.14.el5 on it. And as per https://apple.stackexchange.com/questions/386924/my-smb-shares-wont-mount-under-catalina-whats-wrong, I've just ...
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gpgconf cannot find --launch option

When running gpgconf --launch gpg-agent I get: gpgconf: invalid option "--launch". My gpgconf version is:gpgconf (GnuPG) 2.0.22 and I am running centos-release-7-7.1908.0.el7.centos.x86_64. Any help ...
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34 views

Backporting HID driver keyboard support

Long time linux user, but never gone to this level before, so forgive my naivete. On CentOS 7 (kernel 3.10) and I have a recent Apple keyboard. Not all keys behave appropriately, namely the Fn key ...
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54 views

interpretation of yum error messages

I tried to upgrade php 5 to php 7 on CentOS6 but failed with errors like this: --> Finished Dependency Resolution Error: Package: php-mcrypt-5.3.3-5.el6.x86_64 (epel) Requires: php(api) ...
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Vagrant can't boot after sudden power interruption

Vagrant was doing a Docker build command when suddenly power got interrupted. Now I try to bring back the vagrant VM and I got the follow error: The guest machine entered an invalid state while ...

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