Questions tagged [centos]
CentOS is a free (as in beer and speech) GNU/Linux distribution that is community driven and based on source code released from RedHat.
10,680
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Full disk encryption on CentOS 9 Stream with TPM2 decryption at boot time
I'm working on provisioning a server that requires full drive encryption and I want to automate the process of decrypting the drive at startup using the TPM2 module available on the motherboard, but I ...
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Yum command to find files that an RPM will deploy
On Ubuntu/Debian you can run
apt-file list nginx-core
and you will get a list of all the files that a package will deploy when installed.
How can I achieve this in RHEL with the yum command ?
The ...
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High CPU usage by ksoftirqd
We use GCP for running Kubernetes and for communication with our services in different locations using VM masquerading by iptables. The first time we faced an issue with performance when we use only ...
google-compute-engine
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430
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How to diagnose out of space errors?
Twice I've noticed out of space errors in my php app and both times I've received the error "No space left on device while writing config" when attempting to login via ssh to troubleshoot ...
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How to resolve NXDOMAIN in centos using bind/named package
I am trying to configure DNS server on centos 7. I am following this link.
when I run dig -x 192.168.40.107 I don't receive any answers record. here is output
; <<>> DiG 9.11.4-P2-RedHat-9....
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Emails delivered, but no where to be found
I have been working on this for 2 days now and am desperate for some help.
Postfix & Dovecot
CentOS Linux release 7.9.2009
Plesk 18.0.50
For the most part emails are flowing into the server ...
- 141
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120
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I cannot get environment variable from apache
On a Centos 8, I added a SetEnv into my VirtualHost conf:
<VirtualHost *:XXXX>
Alias /static/ /opt/industrialisation/xxxx/xxxx/xxxx/
<Directory /opt/industrialisation/xxx/xxxx/>
...
- 163
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80
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DNS resolution using a VM under libvirt
I have a Fedora 36 laptop with libvirt configured and run free-IPA server, based on CentOS 8 as a virtual machine. The IP address of this IPA server is 192.168.122.20 and my host laptop has an IP ...
- 223
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454
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Unable to su or ssh as anyone but root on CentOS 7
I seem to be unable to ssh or su as a local user on my CentOS 7 machine as of today.
$ adduser ndejay
$ passwd ndejay
Changing password for user ndejay.
New password:
Retype new password:
$ su ndejay
...
- 209
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xfs corruption metadata after reboot
I had a problem on a RAID1 with 4 disks. We replaced the faulty disk and restarted the server, the rebuild was done, two linux centos 7 machines did not come up accusing error of xfs corruption. Other ...
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Why does xinetd try to close file descriptors on startup?
I have xinetd running inside a docker container (base image centos:7) on a rockylinux 9 host machine.
On starting xinetd service in the docker image, it appears to hang. So I used strace, and found ...
- 469
2
votes
2
answers
1k
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Redhat phantom out of memory issues
We have a server that runs various headless applications, such as Java. It processes to stream data, daily python scripts, etc. From time to time some of our applications get out of memory errors.
The ...
- 509
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2
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674
views
df -h --total command showing wrong total disk size
I have 512GB attached to my linux centos 7.9 server I'm trying to know how much total disk size used from overall disk size from inside the server
I tried to use df -h --total command to show the ...
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What is the equivalent to "sudo apt autoremove" in CentOS?
I read this but there's no apt command in CentOS. So, how can I remove unused packages in CentOS?
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netbooting CentOS via PXE and UEFI : unable to mount root over nfs -- failed to switch root path /sysroot
Last weekend, I went down the rabbit hole of trying to netboot rockylinux on raspberry pi 4.
I was able make it work as far as being able to boot the kernel. But I fail to properly nfs mount root. I ...
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vsFTPd 3.0.5, 331 Please specify the password. Password: 530 Login incorrect. Login failed. Centos Stream 9
On Centos Stream 9
when I try to connect via FTP it says
vsFTPd 3.0.5, 331 Please specify the password. Password: 530 Login incorrect. Login failed.
The username /password are correct I treid many ...
- 11
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1
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225
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Can't connect to mysql after managing systemctl (Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock')
I needed to run a program (just a compiled c++ program, not script, i.e., like /var/programname) on startup on CentOS 7.
I followed this guide https://www.howtogeek.com/687970/how-to-run-a-linux-...
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1
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494
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ssh could not connect to the server, and disconnected after providing the username. Logs for sshd-ddd and ssh-vvv are provided below
The original text is in Chinese, translated into English using Google Translate.
premise
Because of the need to upgrade glibc2.28 to glibc2.29, and later required too many dependencies, the upgrade ...
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717
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Centos 7 dhcp server not responding to UEFI PXE DISCOVER
I'm trying to set up a Centos 7 server as a dhcp server for PXE (UEFI). I'be tried several changes to the dhcpd.conf file, but nothing seems to make a difference.
dhcpd.conf:
allow booting;
allow ...
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1
answer
214
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DNS issue with CentOS7?
I am working in a VMWare environment creating a network for a college class, and I keep running into what I can only assume is a DNS error with my two CENTOS7 systems. The system environment is as ...
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2
answers
986
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List all tags in SVN repo
If I run svnlook tree -N /path I get a list of the top level folders in the SVN repo like this:
/
tags/
trunk/
But what I need to see is a list of the current tags. I know I can turn off -N but ...
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Centos 7.0 can't start network service
I get this error when I start network service
Job for network.service failed because the control process
exited with error code. See "systemctl status network.service"
and "...
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0
answers
2k
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failed to create bus connection: no such file or directory
Virtualbox with ubuntu 22.04
[root@container www]# systemctl start NetworkManager
Failed to get D-Bus connection: No such file or directory
Virtualbox with ubuntu 20.04
docker run --privileged -d -...
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1
answer
890
views
PermitRootLogin set to no but can still use root on Centos Stream 9
Im following an RHCSA training course and to disable root I need to set PermitRootLogin to no in the /etc/ssh/sshd_config file and restart sshd using systemctl. I've done all this and can still login ...
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0
answers
54
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Server with high bandwidth + ftp connection impossible (CENTOS 7 + NGINX)
I have a video streaming server using centos + nginx (1gbps port).
When all services are active it is impossible to connect to ftp. There is no bandwidth left for FTP. It prevents me from adding new ...
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1
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0
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433
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Centos 7 CVE-2022-42920 missing security update
Since a couple of months we are using a vulnerability scanner (Rapid 7) which is complaining about the bcel package being vulnerable. Red Hat released an update package, but hasn't found it's way to ...
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dnf update: Cannot download, all mirrors were already tried without success. (all mirror 404)
I am trying to execute the dnf update command on almalinux 8.7
Before a few hours it worked properly, now all mirror gives 404.
I examined the urls, and it seems, that in all repo the checksum in urls ...
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1k
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Monitor disk I/O with zabbix
I'm running both zabbix 5.0.30 and zabbix agent 5.0.30 on Centos 7
In Centos 7 server, I executed this command
[root@STG-front default]# iostat -d sda
Linux 3.10.0-862.el7.x86_64 (STG-front) 01/09/...
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2
answers
531
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HTTP 403 with CloudFlare
I've added my site to CloudFlare. I'm trying to allow requests to only come in through CloudFlare's network, and reject all others. When I add the following to my .htaccess, I get HTTP 403 Forbidden.
#...
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1
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867
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CentOS VM on VMware ESXI: System UUID and Serial number not same
We are running CentOS 7.9 with OKD cluster 3.11 on VMware ESXi 6.7.0.
As part of our activities, we are trying to setup cloud-provider integration with the VMware to have dynamic PV/PVC provisioning ...
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1
vote
1
answer
725
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how and why container and its image is getting deleted automatically?
I have a zeppelin container running on centos7 and on every couple of days the container and its image is getting deleted automatically, and every time i have to to docker compose up -d.
here is the ...
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2
answers
2k
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Stunnel Server On CentOS 7 - TLS options: 0x2100000 (+0x0, -0x0) Error
I am using CentOS Linux release v7.9.2009 (Core) with latest update.
First of all i installed latest version of OpenSSL there.
Here is the commands for that installation :
cd ~
wget https://www....
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2
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377
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Unable to delete file in Centos
I can't remove certain file in Linux. Here the example:
[root@HBL01 home]# ls -ltira index.php
393591 -r--r--r-- 1 apache apache 14335 Nov 23 2021 index.php
[root@HBL01 home]# rm -rf index.php
...
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1k
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Couldn't resolve host name for http://vault.centos.org/centos/8/AppStream/
Every time I run a command on my virtual server, I get the following error centos8
[root@servers03 ~]# dnf install epel-release CentOS Linux 8 -
AppStream 0....
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1
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mysqldump on mariadb 10.2.44 CentOS 7 does not work, but mysql does
CentOS 7 MariaDB 10.2.44.
X [root@psa95 ~]$ rpm -qa | grep Maria
MariaDB-server-10.2.44-1.el7.centos.x86_64
MariaDB-common-10.2.44-1.el7.centos.x86_64
MariaDB-compat-10.2.44-1.el7.centos.x86_64
...
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i want to restrict all commands for user except ssh command
I am a root user and don't want that users can execute all linux command except ssh. They only have to use ssh command in their user. How to do that? please anyone help.
2
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0
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ovirt noVNC console error : Something went wrong, connection is closed
Context :
oVirt 4.4.9.3-1.el8
glusterfs 8.6
Self-hosted engine
Problem:
Since I update my certificates (with engine-setup) because of the warning that my certs
will expire soon, I can't open the noVNC ...
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1
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154
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can not mount EBS volume to centos EC2 instance
I have an ec2 instance running centos and I want to add an EBS want to it. I created and attached the volume to my instance. my volume is attached as /dev/sdf. But when I try to check if there is any ...
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3
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938
views
Extend /var partition on Centos Stream 8
During the installation of my centos stream 8 OS I gave /var a size of 10GB thinking it would be more than enough, but after I started using docker I found of that it takes too much space on the /var ...
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109
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How to make redirect rewrite rule for https subdomain on apache (CentOS8)?
I have own domain for example.
https://example.com
Below is my apache virtual host with 301 redirect rewrite rule.
<VirtualHost *:80>
ServerName example.com
DocumentRoot /var/www/html/...
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0
answers
117
views
CentOS 9 KVM : Guest VM NIC not on 10Gbps
I have a CentOS KVM host with a traditionnal 1Gbps NIC for general network and a Intel NC522SFP NIC to allow 10Gbps transfer with my computer.
I am facing a problem that I can't solve, I am on it ...
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0
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302
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xauth on Oracle Linux 6.8 constantly fails with "xauth: error in locking authority file /root/.Xauthority"
Newly installed Oracle Linux 6.8 (actually a RHEL/CentOS 6.8 release underneath), yum install xorg-x11-xauth, xauth list , xauth generate, all xauth commands involve $HOME/.Xauthority file fail with ...
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2
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3k
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Make ip route add and ip rule add commands persistent on startup
I need to make the below two lines persistent so that they are available on server reboot now that I have proved that the route and the rules works as expected on AlmaLinux 8 (AlmaLinux is basically ...
- 268
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1
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468
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Routine SCP Command fails (VPN/Network Active)
My dev machine runs on Fedora (36).
Recently I attempted to scp a file to a remote server (CentOS 7) and got a cryptic error message:
scp: dest open(""): No such file or directory
The ...
- 685
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1
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135
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openvpn: Monitoring gateway usage
all
Is there any way to determine if the openvpn server is being used "as intended" by everyone? Company rule is to only allow the local network through the vpn, not the "full" ...
- 125
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1
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148
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How to configure a /27 subnet on vlan Centos 7
I have a dedicated server running Centos 7.
I purchased a /27 subnet from my hosting provider. They said:
"Your /27 subnet should be acceptable over vlan-interface with tag 18."
I asked them ...
2
votes
1
answer
192
views
MariaDB - Contiunes to use more memory
We are running Maria DB 10.6.9 on CentOS and we are observing it continues to increase the usage of memory.
Server Specifications:
RAM - 128 GB
vCPUs - 48
Swap - 100 GB
We have configured ...
1
vote
1
answer
1k
views
How to configure a system wide proxy for php file_get_contents on CentOS?
I want to let the php file_get_content function connect to network via system-wide proxy. I tried to add the following lines in /etc/environment:
http_proxy=http://localhost:3128/
HTTP_PROXY=http://...
- 123
2
votes
1
answer
1k
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Fix kernel issues in rescue mode
I have updated the kernel in a VPS Centos 7, and after rebooting, the machine is not responding anymore, including with SSH.
I connected to the VPS via a temporary rescue linux machine from where I ...
- 637
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1
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165
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Linux: How to auto mount home for specific users from remote
I hope this question was not asked before, but I could not find something which really matches my problem.
Following scenario: We a park of 10 (or more) linux machines with the same user accounts (...
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