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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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How can I debug a slow (software) RAID 10 array?

I have a software RAID 10 array setup using mdadm. There are 8 separate disks. Both read and write speeds are extremely slow, especially writes. Any large (multi-GB) file added to the filesystem is ...
jnasworld223's user avatar
-2 votes
1 answer
57 views

Mail servers setup - HA

I would seek your expert guidance for this topic and your help would be really appreciated. I want to setup mail service in my org in such a way that they are highly available and even if one of the ...
sunny_hkhk's user avatar
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26 views

java + how to tune ParallelGCThread for G1GC

tuning the Java Virtual Machine is very challenging and from our last investigation we saw improvement when increasing the value of ParallelGCThread but in fact we want to know the formula that gives ...
King David's user avatar
1 vote
0 answers
26 views

Hive metastore + Hiveserver2 + what is the prefered Garbage Collectors – Serial vs. Parallel vs. CMS vs. G1

From time to time we see messages as jvm pause defected from HiveMetastore & Hiveserver2 logs in spite we increased the heap size to the right size ( according to number of connection to HIVE ...
King David's user avatar
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37 views

What is the proper way to remove a brokers from a kraft cluster?

before couple month's we installed in production environment 34 Kafka Kraft machines with version - apache 3.5 , all machines are working well in the cluster , when topics are created with replica 3 ...
King David's user avatar
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21 views

HDFS + how to speed up reading writing from/to hdfs replica

we have HDFS cluster based on Hortonworks HDP 2.6.5 version cluster include 328 data node + node-manager machines and 2 name-node machines ( when name-nodes are high availability) we runs spark ...
King David's user avatar
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0 answers
22 views

Can I set up IPsec tunnels between three branches?

I want to set up IPsec tunnels to connect three branches. In total, you should get three connections: HQ-BR BR-DC DC-HQ I wanted to do this on the Linux operating system using strongswan tools, but ...
Михаил Семчук's user avatar
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1 answer
105 views

OpenVPN client 2.4.4 cannot connect to OpenVPN server 2.5.1 [closed]

I have OpenVPN 2.5.1 on Debian 11 VPS, and OpenVPN 2.4.4 on my Linux PC client. I cannot connect to VPN server from my Linux PC by using this client.ovpn file. TLS Error: TLS key negotiation failed to ...
Arnimundo's user avatar
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1 answer
172 views

proxmox stuck at "Loading initial ramdisk" after changing /etc/modprobe.d/vfio.conf

Hello fellow server admins, I have a proxmox hypervisor for my VMs and the file system is raidz1. Today I was wondering if I could install an nvidia card and run 3D Applications so I found a promising ...
eraikun's user avatar
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0 answers
35 views

Mailu limit number of emails send in a month/Day

Is it possible to limit the users to send total email in a month/day by using mailu. Example 1. [email protected]: can send only 100 emails a day & 3000 emails in a month. 2. [email protected]: ...
Gialap Duong's user avatar
2 votes
0 answers
104 views

Linux Kernel keeps retransmitting data already ACKed by peer

I have the strange issue that a session without obvious cause hangs and timeouts. The session is a syslog stream with rather high volume, and traffic only flows from client to server. In capture files ...
user2567482's user avatar
1 vote
1 answer
66 views

How to demo ICMP Type 3 Code 4, Fragmentation Needed and Don't Fragment was Set

I would like to demo a situation where the MTU traffic is higher than one accepted. So, source would receive the ICMP Type 3 Code 4 as reply. I am trying with two Linux instances running on AWS. Both ...
Azize's user avatar
  • 160
1 vote
1 answer
135 views

Understanding DMARC report - DKIM pass on SPF fail

I am looking for some help understanding a DMARC report for my email server. The xml content looks like the following: <?xml version="1.0" encoding="UTF-8" ?> <feedback>...
gdldg's user avatar
  • 13
-1 votes
1 answer
94 views

curl update in Alma9

our vulnerability management team classifies this CVE in curl as crtitical: https://curl.se/docs/CVE-2023-38545.html We are using Alma 9.4 and the newest curl Version provided bei Alma is 7.76. But ...
mmoossen's user avatar
  • 119
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0 answers
30 views

Configure raid1 on working linux

I have to create a raid1 software on a working AlmaLinux OS. Server has 2 disks, the first (sda) with OS installed and the second (sdb) empty. What's the right procedure to do that? I was thinking ...
Castellino Roberto's user avatar
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1 answer
25 views

Slow apache restart or gracefull when tee is in use

I have this in each virtual hosts in my Apache HTTPD confs: CustomLog "|$tee -a /www/domainX/logs/apache/acces_log" combined On servers with more than 100 domains, there is an issue with ...
Pavel's user avatar
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48 views

Issue with Hard Limit in Project Quotas (Ext4)

I'm experiencing an issue with project quotas on an ext4 filesystem, specifically with the hard limit not blocking writes when exceeded. Here are the steps I've taken to set up project quotas: Check ...
n3rvio's user avatar
  • 1
0 votes
1 answer
151 views

The ipa-replica-install command failed, exception: ScriptError: A replication agreement for this host already exists

We have deployed a FreeIPA server in my company and we would like to deploy a replica. I have followed the procedure to deploy it on a personal server and it worked (https://www.freeipa.org/page/V4/...
NotBeCursed's user avatar
1 vote
1 answer
53 views

How to configure a forever running systemd service while being able to report for errors after a certain amount of attempts?

Desired Solution I have a service that shall run indefinitely (self-healing) but shall report the occurred error to another resource in order to not create a zombie service which is constantly ...
antonio's user avatar
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1 answer
65 views

Red Hat Enterprise Linux 8.9, Wi-Fi, and a certificate

My workplace uses NPS on Windows Server for Wi-Fi authentication: Windows users authenticate as dept\first.last as if logging into Windows, and it works. Using my personal Android phone, I ...
user2007854's user avatar
0 votes
2 answers
46 views

Is there a way to bypass iptables/ip6tables rules for localhost traffic?

I have a firewall mechanism based on iptables/ip6tables that allows its users to block or accept traffic from hosts, by adding rules at the top of iptables/ip6tables. I would like all traffic ...
Koija's user avatar
  • 11
3 votes
1 answer
600 views

Almalinux 8 | Unable to detect release version

Good Day I have three Almalinux 8 servers, and they all three are running on 8.9. Out of the three, two seem to fail when I run yum/dnf update with the following error: yum update Unable to detect ...
Granwille's user avatar
  • 151
0 votes
1 answer
98 views

Postfix check_sender_access not blocking certain addresses

I keep getting spam emails from 'ional.co.uk'. I've got an address based blocking solution which handles all other emails just fine, but somehow this domain keeps getting through. Full files I can add ...
Sarazil's user avatar
0 votes
0 answers
30 views

Using addresses from subnet v6 vultr

Hi I have an inquiry for you guys, is it possible to use the address from the subnet//64 ipv6 through applications without bind it? I currently have an address, and I would like a python script to be ...
Jozef Ogrych's user avatar
1 vote
0 answers
90 views

docker-php-ext-install recently failing in a php7.1-fpm image

Im having some issues recently .. About 3 days ago my installs just docker setup is failing each time im running it ... Its been working perfect before this, unfortauntly due to work, im unable to ...
Chris's user avatar
  • 309
0 votes
1 answer
24 views

using sed to replace a string between quotes '12h' by '3h'

I am trying to use sed to replace a string like '12h' by '3h' sed -i 's/length_s = '12h'/length_s = '3h'/g' my_files but it didnt work
Rabah's user avatar
  • 1
0 votes
1 answer
45 views

User created in linux has mismatched uid and gid

On my amazon linux ec2 instance, I created the group fungames and the user testuser-1. I then looked at the /etc/passwd and /etc/group file. The values added to the file by the linux subsystem doesn't ...
Tim Nguyen's user avatar
-1 votes
1 answer
83 views

How to disable F9 (process kill) option in htop

Is it possible to remove or disable only the F9 (process kill) option from htop? I have gone through the man pages and documentation, and all the layout options seem to be related to process/columns, ...
Ani's user avatar
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0 answers
56 views

Could not boot AlmaLinux when restart the os

I tried to reboot my alama linux 9, then it couldn't boot. The following are some of the error snapshots. I booted into single mode and moved snap related systemd files, but it's the similar errors ...
Donghua Liu's user avatar
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1 answer
378 views

AH00170: caught SIGWINCH, shutting down gracefully

i have a web server on Debian and Apache2, about once a day or once every 2 days Apache2 crashes, here are the Apache2 error logs: [Wed May 22 13:04:01.082969 2024] [mpm_prefork:error] [pid 874799] ...
spider5414's user avatar
0 votes
0 answers
41 views

How does one configure nginx for whitelabel solution?

I am trying to implement a whitelabel solution for my clients where they use their own domain or subdomain that is pointed to my server IP to serve my application. For example: subdomain.anydomain.com ...
Mojahudul Islam's user avatar
0 votes
0 answers
18 views

Unable to connect to WhatsApp messages in low bandwidth 22kbps uplink and 88kbps downlink from router even internet is connected

We are working on low bandwidth environment with 22kbps uplink and 88kbps downlink. Configured Router with iptables to deny all the traffic and allow on WhatsApp domains, ports and IP's. We were able ...
Soujanya Ramini's user avatar
1 vote
2 answers
217 views

MariaDB consuming swap on AlmaLinux 9.4

After upgrading from AlmaLinux 9.3 to 9.4, MariaDB started consuming swap more and more on several servers. Using MariaDB 10.11.8. Having vm.swappiness = 1. MySQLTuner 2.5.3 shows: -------- ...
ivp's user avatar
  • 33
0 votes
1 answer
146 views

Podman "no route to host" when pushing to container registry with sudo, but works without sudo

I am encountering a problem with Podman on my system when I try to push images to a local registry. First, I start the registry container with sudo. $ sudo podman container run -dt -p 5000:5000 --name ...
Couim747's user avatar
0 votes
1 answer
119 views

How to make my Linux router forward traffic over a NAT properly?

I have a Linux box that I'm using as a router with a NAT. It is connected upstream on 192.168.1.x/24 and inside the NAT on 10.0.x.x/16. I am also running a DHCP and DNS server on it, though those seem ...
jnasworld223's user avatar
1 vote
1 answer
254 views

Disable insecure MACs for sshd

I need to disable the following MACs on my OpenSSH server: [email protected], [email protected], hmac-sha2-256, hmac-sha2-512, hmac-sha1 I confgured /etc/ssh/sshd_config with: Ciphers ...
Nicola Mori's user avatar
0 votes
1 answer
149 views

TrueNAS Scale Installation on Proxmox Fails with "lsblk: CANT_FIND_vda3_OR_vdap3: not a block device" Error

I'm attempting to install TrueNAS Scale (24.04.0) in Proxmox (8.2.2), but the installation fails with the error message lsblk: CANT_FIND_vda3_OR_vdap3: not a block device. Below is the table of the ...
cyberquarks's user avatar
1 vote
1 answer
139 views

Openvpn on fedora40 raises error on systemd process but works well in regular command prompt

Although on ubuntu everything is work well when I tried to start openvpn as systemd service in fedora40, its work well in prompt : sudo /usr/sbin/openvpn --verb 9 --suppress-timestamps --nobind --...
osman corluk's user avatar
0 votes
0 answers
33 views

unknown values are added to iptables

New rules are being added to the iptables firewall from an unknown source. I was doing iptables -F of mangle, nat, filter and a minute later new rules appeared. I did iptables-restore and a minute ...
vanja109's user avatar
0 votes
0 answers
78 views

SCP Transfer Interrupted with 'Broken Pipe Client Disconnect' Error - Self-Developed Modems"

I'm encountering an issue with SCP transfers between two systems connected via self-developed modems. When attempting to transfer a large file(around 7GB), the transfer starts successfully but ...
Madala Raviteja's user avatar
0 votes
1 answer
91 views

Backup files not saved with original user

I'm using rdiff-backup to backup from local filesystems to a remote Hetzner server with a mounted remote storage box. The storage box is mounted on the remote server as a cifs filesystem. The backup ...
Clodoaldo's user avatar
  • 435
0 votes
0 answers
19 views

"Filter failed" error in Redhat 7.9

Good afternoon, I would like to know if you can help me with this error in Red Hat 7.9, when trying to print via CUPS on a printer created by SMB I get the following error: retenido desde Tue May 14 ...
user3338076's user avatar
0 votes
0 answers
71 views

Mega RAID suddenly, incredible slow after a consistency check and nothing found

I am having difficulty solving this problem. I have a RAID consistency check every Sunday, and I checked today after my colleagues complained about the server being painfully slow. I checked iotop, ...
danone's user avatar
  • 166
0 votes
1 answer
55 views

Mysql filling up disk space, but storage not even on this disk

Have Mysql running on a server, with data, backups and logs each on their own disk. For 2nd time recently the root disk has filled up to 100% which gets cleared the moment that MySQL restarts. This ...
Mark Walker's user avatar
0 votes
0 answers
140 views

AlmaLinux blocking outgoing connections

I have a new AlmaLinux installation that is blocking outgoing connections to most ports, with the exception of a handful. I notice this mostly because the server runs Exim and no e-mail can be sent on ...
David Mora's user avatar
0 votes
0 answers
189 views

How do I resize /dev/sda3 in a Proxmox (Debian) system?

I am new to Linux and new to Proxmox. I am running Proxmox as a VM under VMWare Workstation Pro (VMW). When creating this VM I allocated 500GB of host hard drive space to a single virtual drive. ...
mbmast's user avatar
  • 133
0 votes
1 answer
134 views

How can I fix wrong mdadm.conf in a working raid 1?

I have a server linux with CentOS Linux release 7.9.2009. Server has 2 disks with a raid1 software. Raid1 seems ok, and if i run cat /proc/mdstat this is the output: Personalities : [raid1] md124 : ...
Castellino Roberto's user avatar
0 votes
0 answers
360 views

RHEL upgrade from RHEL 7 to RHEL 8 by using ISO + upgrade an offline

We are working on Linux RHEL 7.9 ( VM machines ) in order to upgrade RHEL version to 8.6 We are using the ISO file - rhel-8.6-x86_64-dvd.iso since RHEL7.9 machines has no direct connection to the ...
King David's user avatar
0 votes
1 answer
115 views

How to extend / partition by reducing /home partition in a live linux server?

We are running a CentOS Linux server to host websites. The website data are stored in /home partition and it is mounted separately. Here's it: [root@myserver ~]# df -h Filesystem Size ...
MinHeap's user avatar
0 votes
0 answers
62 views

Linux ACL of a shared folder for specific group

I need to make a shared folder: I have separated my work between several users on the same computer and need them to access the same folder without restriction. They all belong to a "work" ...
user3450564's user avatar