Questions tagged [linux]

Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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Slow throughput when iptables is running (10GbE)

When iptables is running the throughput on the 10GbE gets slowed down and I have no idea why. Gentoo Linux with Kernel 6.6.21 CPU: Intel Xeon E5-1650v4 ~#@❯ iperf3 -c 192.168.0.12 Connecting to host ...
Daniel Mann's user avatar
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Virtual environment created with pipx - update python version

I have package installed with command: pipx install package Now I need: update Python version installed on server (this can be done eaisly by apt command update Python version inside existing virtual ...
user1209216's user avatar
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Wireguard clients can not KDE connect between peers

I succesfully established a Wireguard VPN from a Rocky Linux 9 server at the cloud. As of now there are two clients: a Fedora desktop and an Android mobile phone. The first problem I want to solve is ...
Clodoaldo's user avatar
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PTP and ethtool output on Nvidia Jetson Orin

I am currently using the Nvidia Jetson Orin AGX dev kit with a Basler GigE interface card and two GigE Cameras connected to port 0 and 1 (eth0 and eth1) I am trying to setup PTP with ptp4l and phc2sys ...
Nailtha's user avatar
1 vote
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41 views

NFS is too slow

I need your help. The server which my senior built had some problem, so I reinstalled server. Former one and now one have been built with same way. Clients get bootloader from the server from tftp. ...
hydro-carbo-nitro's user avatar
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Change item in Apache configuration file with `awk`

I am not an expert with awk tool. I must miss something obvious... What works so far: [root@checkmk ~]# awk '/^[[:blank:]]*SSLCertificateFile/ {gsub(/\/etc\//, "/not_etc/")} 1' \ /etc/httpd/...
user148942's user avatar
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Linux server integrated into AD does not authenticate users

I have some Linux servers integrated into AD. One joined to the domain with no error, but it does not authenticate any AD users. Could you help me? Log and configuration files: [root@oracleLinux72 ~]#...
stenioc1's user avatar
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Multi-user multi-server setup suggestions [closed]

I am currently in the process of planing a a setup in my university to provide students with access to EDA (electronic design automation) tools. Due to the different requirements of the various tools ...
jagjordi's user avatar
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1 answer
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mysql threads connected more than processlist and established connectios

Recently we have been facing an issue with MySQL. We use Percona MySQL 8.0.21 and set max_connectios to 7000. Sometimes in peak times, we reach 7000 connections and when we run show status like '...
Ssaf's user avatar
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Physical volume "/dev/sdb1" still in use, How can i remove a PV to simulate its failure

1I'm trying to remove a physical volume from a VG sudo vgreduce mirrorgroup /dev/sdb1 I made two PV sdb1 and sdb2 and mirrored this based on the activity I'm performing. I needed to simulate a drive ...
Recurseed's user avatar
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Yum Update python error [closed]

In a almalinux with cpanel server, when try to update yum with the command "yum update" throwing the following error. Error Details: Traceback (most recent call last): File "/...
HMaddy's user avatar
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Setting up dnsmasq without risk of DNS leaks while tunneling

Context I have a single machine on the LAN, running dnsmasq server set to listen only on private IP (machine A, not a router). All other machines on the LAN (including machine A) use dhcpcd with ...
namonaki's user avatar
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git clone fails on NFSv4 share when ACL is set

Our Linux servers mount NFSv4 shares exported from an Azure NFS server. The findmount commands gives this detail. rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,...
mr.zog's user avatar
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How to decrease the time for timed out in Heroku?

Currently, I am running an app in Heroku. It uses several dynos at a time. But the problem is dynos getting stuck. It does not return anything and sits idle for 24 hours and kills itself. I was ...
Bad Coder's user avatar
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Avoiding Google Authenticator reauthentication for existing SSH sessions on EC2 [closed]

I configured Google Authenticator for 2FA on my Almalinux 9 EC2 instance to secure SSH access. However, I'm prompted for the Google Authenticator code every time I open a new SSH session, even when a ...
Dhanushka Ekanayake's user avatar
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1 answer
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What does USE_KERNEL_MODE_SETTING do in Hetzner installimage conf?

When I order a new server, SSH into it (while it is running the initial network-booted rescue system) and run installimage, text editor will open where I am supposed to specify the new system ...
Messa's user avatar
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dmesg + many messages as error count since last fsck

we have kafka cluster with 3 VM machines. , when each kafka machines use the sdb disk ( VMDK disk ) in order to store the data on all machines we seen the following kernel messages [1123783.849575] ...
King David's user avatar
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29 views

KVM guests lose connectivity after host network restart [closed]

I have problem, but I cannot work out the solution: KVM guests lose connectivity after networking restart All KVM guests lose network connection PERMANENTLY when the host's network is disconnected, ...
13fcali's user avatar
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0 answers
55 views

DDOS Attack On Website Using Cloudflare and Its Under Attack Mod Is On

My website using nginx has been down, and i suspect a DDOS attack, i have turned on Cloudflares Attack mode but thats is not helping. The load average is above 15 and website is not responding. ...
Jones smith's user avatar
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1 answer
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Reducing root partition in VPS (Ubuntu 20.04)

I have a virtual server that does not have access to rescue mode I only have ssh access My disk size is 100 GB, which is all allocated to the root partition when installing the operating system. I ...
Mehdi Karimi's user avatar
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0 answers
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Web server behind WireGuard tunnel doesn't see real client IP

Server WireGuard configuration: [Interface] Address = 192.168.0.1 PrivateKey = {{ wg_pk_home }} ListenPort = 1194 # packet forwarding (IPv4) ...
Markus's user avatar
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I try to make a script with a cron script [closed]

i have a script file and i have add a cron to that file but dont work this is the script please what im doing wrong? the script the cron exist but dont run
Glen Womac's user avatar
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Installed wrong drivers for Epson printer

I have a Kubuntu 22.04 and I had an existing Epson XP-235 printer already working fine with a Windows desktop. I connected the Epson printer to Kubuntu, it was detected an provided a list of drivers. ...
Jim's user avatar
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Another NetExtender instance is already running. NetExtender will now exit in linux

I Have provisioned the Ubuntu 20.04 LTS machine on the GCP Console. We've installed xRDP to facilitate remote desktop access. So we installed the NetExtender on Linux through RDP Install NetExtender ...
RAM's user avatar
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-1 votes
2 answers
62 views

Is there a free rocky linux monitoring tool? [closed]

I am currently looking for a tool to monitor the performance of two Rocky Linux desktop computers. It should monitor aspects such as the CPU, RAM, disk, and network usage (similar to the Windows Task ...
floriandev's user avatar
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164 views

Citrix workspace desktop (icaclient) for linux cannot add account

My Citrix workspace desktop for Windows works fine. When I installed the Linux version (Debian), it cannot add account. The error "Http error" was shown. It is same network, two different PC ...
micemaze's user avatar
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1 answer
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the value of cpufreq-info -w and cpufreq-info -f are very different

Environment: # uname -r 5.15.0-91-generic # lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 52 bits physical, 57 bits virtual Byte Order: ...
xiaojueguan's user avatar
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Regarding the issue of degraded query performance after upgrading bind9

I would like to ask if anyone has encountered a problem where query performance deteriorates after upgrading the bind version. Here are the performance test results for versions 9.16.49, 9.18.25, and ...
zcchann's user avatar
2 votes
1 answer
104 views

CentOS 7 min with Apache not accessible externally

I have a CentOS 7 min installation on a virtual machine with the internal IP of 10.1.10.131 and I installed Apache 2.4.52 on it. I can access the landing page when I put 10.1.10.131 into the browser. ...
Hussein Sabbagh's user avatar
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Linux OOM with tons of swap memory available

My server is killing MariaDB periodically due to Out of Memory. The thing is, there's tons of swap memory available, and the swapiness is set to 100. One way or another, from the kernel dump, nothing ...
forrealthough's user avatar
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2 answers
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Creating an ssh keypair for AWS Lightsail/EC2 instances doesn't work as expected

I've created a fair few SSH keypairs in my days but AWS seems to handle them differently. I'm using AWS Lightsail and it has a notion of 'default' keypairs. This is fine for the 'normal' user that AWS ...
Alistair Ross's user avatar
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1 answer
29 views

NFS4 client only writes either 4kb or 128kb of data

I have a Debian NFS4 server that exports two volumes and several tens of Debian clients using these shares - mounted rw. Recently I noticed that some of these clients get into a strange state: When ...
michalt's user avatar
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Radius Bulk CoA message to BNG Juniper

I am working in BNG implementation with Juniper MX960 and I am interested in Bulk CoA feature to address accumulation of a series of CoA requests and commits all of them together. But I don't find any ...
Pablo Xavier's user avatar
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MegaRAID LSI SAS-9266-8i no RAID6 available after flashing firmware

Dear Good People of serverfault.com, I flash my MegaRAID LSI SAS-9266-8i RAID controller with latest Mega Firmware found here broadcom.com using storcli64. Everything went fine However, it seems there ...
Flan Alflani's user avatar
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0 answers
13 views

Disconnect NIS authentication on SVN server

I have SVN configured to authenticate against NIS, also not sure how it authenticates against NIS. I want to disconnect the server from NIS and convert it to local authentication. How this can be ...
Rajesh Yidi's user avatar
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79 views

MongoDB issue with TLS

I am trying to set up TLS certificates for my standalone MongoDB instance on a cloud compute instance. I got the certificates from certbot using the command sudo certbot certonly --standalone -d. i ...
Mervin Hemaraju's user avatar
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How to extract umask value from new instance bash shell with single command?

I can extract umask value from new instance bash shell with this method : [ansible@rhel8 ~]$ umask 0027 [ansible@rhel8 ~]$ bash [ansible@rhel8 ~]$ umask 0002 [ansible@rhel8 ~]$ But for me this is ...
M. Fachrizal Utama's user avatar
3 votes
1 answer
319 views

Syncthing on ZFS a good case for Deduplication?

I've have a ext4 on LVM on linux RAID based NAS for a decade + that runs syncthing and syncs dozens of devices in my homelab. Works great. I'm finally building it's replacement based on ZFS RAID (...
brianclements's user avatar
1 vote
0 answers
115 views

Are very-occasional, very-high read latencies expected from an NVMe SSD under Linux/ext4?

Background context info: I'm working on an application that streams multiple tracks of audio from an NVMe SSD, and I'm measuring the performance of the system to determine how much buffering I need ...
Jeremy Friesner's user avatar
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0 answers
18 views

Unable to Boot when restore OS from Linode to Digital Ocean

I have done a process in creating images using fsarchiver. Here is the point : Doing the OS backup in Linode Restore in new VPS instance of Linode working without any issue Restore in Digital Ocean ...
navotera's user avatar
  • 101
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0 answers
20 views

Change sysctl based on certain conditions

I set kernel.deny_new_usb=1 via /etc/sysctl.d/params.conf, but that's inconvenient of course. I would like to make kernel.deny_new_usb=0 when the user is logged in and the KDE screen is not locked. ...
deniable_encryption's user avatar
0 votes
1 answer
46 views

Debian 12: Particular VM no longer boots properly

When one of our VMs rebooted yesterday it refused to come back up in a strange way. An overview of the VM: Debian 12 on a VMWare ESXi instance. /dev/sda is a virtual disk with 3 GPT partitions (...
Adambean's user avatar
  • 154
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0 answers
28 views

Autofs fails to mount a Windows share

I've got two machines: a 10.0.0.1 Windows 10 which shares one folder /Users/WS/Shared/, and a 10.0.0.2 CentOS 7 from which I want to mount this share. I can do this from commandline using: mount -t ...
Leszek's user avatar
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0 answers
20 views

How do i stop packet flooding on my server? [duplicate]

I use a debian server to host my site, but i've found about this vulnerability in it that it could receive half the packets in a packet flood with this command, ping -s <size of packet in bytes> ...
mohammed's user avatar
0 votes
1 answer
71 views

PHP_FPM extensions not loading in Apache

I'm building out a web server on Rocky Linux 9 with Apache and PHP 8.3. I need the pdo_dblib extension. From the command line via "php -m" and "php-fpm -m", I see that the ...
scott80109's user avatar
-1 votes
0 answers
31 views

Config VPN L2TP/Ipsec

At work, they will require connecting through an L2TP/Ipsec VPN, and they only provide support for Windows. I have a manual on how to configure it in Windows, and I have verified that it works. ...
santos82h's user avatar
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0 answers
32 views

Troubleshooting slow write performance on hard drive

Issue I have 4 SSDs in a RAID0 array. I notice recently that when I am doing anything while on the array mountpoint I will run into these short glitches/pauses. For example, assume I am editing a file ...
Franz Kafka's user avatar
0 votes
1 answer
54 views

Nginx SSL handshake issue

Experiencing WebSocket issues for a SignalR chat in the UI while running in production, but in locally it's working. We are using C# in the backend and React in the UI. I have checked the server log. ...
Anitha Sivakumar's user avatar
0 votes
0 answers
39 views

Subnet cannot view server ip (OPENVPN)

I have an OPENVPN server set up on Ubuntu Server. I assigned a different subnet to 2 particular clients using the ccd function. Being on said subnet both see each other without problems. The drawback ...
Kevin De Vincenzo's user avatar
0 votes
1 answer
54 views

Should I use volumes or bind mounts to avoid building a new Docker images for every application config file change?

I'm running bind9 in a Docker container (in a Linux VM) using a Dockerfile that contains these lines. COPY configuration/named.conf /var/lib/bind/ COPY configuration/tzzz.yo.zone /var/lib/bind/ COPY ...
mr.zog's user avatar
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