Questions tagged [ubuntu]

Ubuntu Linux is a Debian derivative that aims to bring Linux mainstream. Questions on this site should generally refer to Ubuntu Server. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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How do I remove cloud-init backing image from my VM?

I am moving a VM from Ubuntu 22.04.3 LTS KVM host to a RHEL 8.9 Ootpa KVM host. When I try to start the VM on the destination (RHEL) host I see, error: Cannot access backing file '/var/iso/jammy-...
mr.zog's user avatar
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how to give permission to user or app to access /dev/ttyS0 without switching to sudo

I am writing a python app which access the /dev/ttyS0. When the script runs it give permission denied for accessing /dev/ttyS0. PermissionError: [Errno 13] Permission denied: '/dev/ttyS0' I tried ...
kumar's user avatar
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1 answer
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Dovecot - rcpt [email protected]: Failed to initialize user

I have an SMTP server: Dovecot as its IMAP server Postfix as its MTA OpenDKIM to sign the emails. When I send mail it throws this error: Jan 01 10:46:01 example.com dovecot[211047]: lmtp(219823): ...
Mohammed Baashar's user avatar
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Postfix doesn't send mail; example.com loops back to myself & Connection timed out

I have Postfix on Ubuntu 22.04. I can only receive but not send emails. I have configured Postfix using How To Install and Configure Postfix on Ubuntu 22.04 tutorial from DigitalOcean. sudo tail -f /...
Mohammed Baashar's user avatar
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1 answer
245 views

Getting random http/s requests from certain IP addresses

Stack used: ExpressJs, NodeJs, Docker, Nginx, Ubuntu 20.04 I host my backend on DigitalOcean droplet with the tech stack mentioned above. My server constantly has been targeted multiple times on ...
spatak's user avatar
  • 101
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56 views

ZKP5803 POS58 printer failing ti print with "Filter failed" message in Ubuntu

I am trying to install a POS58 thermal printer ZKTeco ZKP5803 in a raspberry pi 4 running Ubuntu 22.04. I updated it into CUPS as a POS58 but when I send the print I get "Filter failed" ...
daniel castellanos's user avatar
1 vote
1 answer
481 views

Netplan configuration for bridge and route setup

I'm not very versed in netplan. Basic static IPs and VLANs are all I've really done. I need to get this set of commands to persist on reboot: ip link add loop-to-lan link eno1 type macvlan mode bridge ...
Buee's user avatar
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1 answer
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Is it possible to bind a port with HTTPS in nginx

I have a graphql api that works when accessed with http://example.com:4001/graphql but does not work with https://example.com:4001/graphql which is obvious as https takes the port 443 and here I am ...
Majid Khan Mohmand's user avatar
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98 views

MariaDB not starting after a server restart

I'm running a LEMP stack for my websites and they were running fine. Monitoring showed that the server wasn't responding to the pings, I restarted it. Now MariaDB service isn't running, my websites ...
Ali's user avatar
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1 answer
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How to get the command of a process by an established port while ss, netstat and lsof failed?

Recently I have noticed extremely high network usage on a ubuntu server. I identified the port with nethogs. It connects to a SMB server within my LAN. It should be connected at boot for the dozens of ...
crackpot's user avatar
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Monitoring network traffic on a multi interface Ubuntu server from the eyes of your provider

I tried vnstat and bmon as network monitoring tools to verify the bandwidth usage which my service provider is billing monthly. The number I reach is roughly 2 times greater than what they report. Now,...
PouJa's user avatar
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195 views

Bind9 Permission issue, unable to sign zone

fellow experts, I am new. I am on Ubuntu 22, I am looking to enable dnssec on my side by using Bind9. However, I don't exactly know where and how to do it. After some trials, I have come up with ...
Hern's user avatar
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1 answer
134 views

pgrep -f from shell script is returning 2 pid instead of 1

code : function main { [ -z "$@" ] && { getProcessId "$@" } || "$@" } getProcessId(){ matchType=$1 #defaulting matchArg to x i.e exact match matchArg=x ...
Nitin Alety's user avatar
1 vote
1 answer
256 views

Configuring 2nd and 3rd NIC on Ubuntu 22

I'm trying to install 2nd and 3rd NICs on a Ubunutu 22 VM running on VMWare. At first setup new VM with 1 NIC - that was successful and able to go out to internet: network ethernets: ens160:...
user212398's user avatar
0 votes
2 answers
138 views

Ubuntu server on Google Cloud Engine freezes randomly

I'm new to Google Cloud Engine, and trying to move my hosting to self-managed VM under Google Cloud. I've setup VM with Ubuntu linux, chosen some Machine type (low spec to start with), configured ...
Pointer Null's user avatar
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210 views

Internal Server Error when deploying Laravel using docker & reverse proxy

I'm trying to deploy my Laravel apps using docker. But got internal server error when accessing the url. I have 2 server, one is for public ip & reverse proxy, and the second is where the Laravel ...
Catto's user avatar
  • 101
-1 votes
3 answers
2k views

No Wired Connections in Ubuntu

I recently installed Ubuntu desktop 23.04.3 on a ThinkSystem RS630 Lenvovo server. I have connected the server to my a working ethernet cable but I get no Wired Connection options on the network ...
Hasam's user avatar
  • 7
-3 votes
1 answer
73 views

DHCP moved from [closed]

After connecting several Raspberry Pis running Ubuntu 23.10 to my switch, they are for some reason stepping on each others DHCP leases. DHCP is running on fpsense 2.7.2... Logs: DHCPREQUEST for 192....
Greg's user avatar
  • 125
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0 answers
76 views

AWS EC2 networking

I've been trying to understand how exactly networking works for EC2 instances, more specifically I'm coming from on-prem infrastructure where I had dedicated networking devices (switches/routers) ...
talematros's user avatar
3 votes
0 answers
120 views

How to investigate 100% CPU load for 15 minutes on random days

"I have a server that runs a website on Apache2 and is behind Cloudflare. The server's normal load, according to 'htop', is 10%. However, at random days/times, the server load spikes up to 100%, ...
CodePanda's user avatar
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2 answers
87 views

How can set the order of name servers in LINUX?

This question is in context with the DNS queries by postfix MTA in Ubuntu OS. The issue I am facing is that I have two name servers one internal and one external. External DNS name server is added in ...
Ayush Gupta's user avatar
0 votes
1 answer
191 views

Milter Application Error Postfix Email Server

I am trying to sign the emails on my email server with opendkim but I am running against an error that I just can't seem to fix. The error I am getting is: warning: milter local:opendkim/opendkim.sock:...
Niels Koop's user avatar
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0 answers
63 views

High CPU load by KVM VM

VMs are hosting Java and they seem to be using high sy% CPU on the server. Is there a way to limit it via Libvirt ? Other VMs not using Java in them are not using that much sy% on the server. I ...
Jevin Gala's user avatar
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1 answer
249 views

OpenResty permission denied even though user has access when testing with sudo

I have a weird issue I can't seem to figure out. I am using OpenResty. The way it should work on that particular server is that the whole configuration and Lua scripts and everything comes from a Git ...
CherryDT's user avatar
  • 101
0 votes
1 answer
106 views

How can I identify why my apache server getting killed once in every few days?

I have an Ubuntu 22.04 lts vps (Contabo) with apache installed. Basic install, nothing really edited or configured. Every few day, the apache gets killed by the OOM killer and I don't know what ...
SzLev's user avatar
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0 answers
19 views

Compute Engine being underutilized

I got a notification saying that my VM instance was being underutilized and that I should change to a lower specification. If I do that, would I lose all the data on the VM.
Donald Peters's user avatar
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0 answers
26 views

How to configure Apahce with websocket through python daphne DJango on EC2 server

Below is my virtual host for running python <VirtualHost *:8000> DocumentRoot /var/www/VITSBACKEND ErrorLog ${APACHE_LOG_DIR}/error.log CustomLog ${APACHE_LOG_DIR}/access.log ...
Shubham Gupta's user avatar
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0 answers
123 views

Kubernetes keeps crashing (Vagrant master+3-node set)

To demonstrate what I've done, I put together a repo with a Vagrant + Cloud-init config. https://github.com/johnmanko/vagrant-k8s-cluster Basically, Kubernetes keeps crashing, and I don't know why. ...
John Manko's user avatar
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1 answer
266 views

Cloud Init can't create Apt source from k8s.io due to 302 redirect

I'm attempting to add the k8s.io apt package source to a VM using cloud-init, but the URL provided from the docs does a 302 redirect, and gpg doesn't like that. cloud-init config.yml: apt: ...
John Manko's user avatar
-1 votes
1 answer
66 views

Deb installation asks me to give inputs

When I trying to install 'nullmailer' in Ubuntu Jammy(22.04), it prompts to provide some required inputs like Mailname of your system:. Is there any way to avoid prompts while installing and ...
Rama's user avatar
  • 51
1 vote
2 answers
67 views

Not able to login to server with subdomain

I have set up an a record on a subdomain of mine which points to the IP address of my server. I am now trying to ssh into my server using [email protected] but I am getting the error could ...
Niels Koop's user avatar
0 votes
0 answers
211 views

Cloud Init isn't adding Apt sources BEFORE apt update is executed

I'm trying to install packages from docker and k8s.io, but package_update: true isn't using the newly added sources, and finding those packages fails. Here is part of the cloud-init config: apt: ...
John Manko's user avatar
0 votes
0 answers
87 views

Unable to create SSL for Ubuntu VPS NextJS application

I am trying to get an SSL for my websites hosted on Ubuntu VPS. I am receiving the following error upon running sudo certbot --nginx -v Certbot failed to authenticate some domains (authenticator: ...
siddhant bhardwaj's user avatar
0 votes
2 answers
108 views

Issues with VPS provider limiting CPU usage with data processing Spring Boot application

I developed a Java Spring Boot application with a PostgreSQL database. Since the data being processed is quite a lot, the processing can take time and it uses a lot of CPU (e.g. up to 100% obviously). ...
BullyWiiPlaza's user avatar
0 votes
0 answers
36 views

Certbot enables root domain, instead only subdomains

I own a domain, lets say example.com. I want a root domain example.com to be 404 or return a blank page (if 404 is not possible). sub1.example.com - should redirect a traffic to a running docker ...
aspirinemaga's user avatar
0 votes
2 answers
194 views

Cannot connect to WikiJS running in Docker via HTTPS

I have a new WikiJS installation on a DigitalOcean droplet (using the marketplace image). I cannot access the site via HTTPS, either with the domain or IP address, but HTTP is fine. I get a pretty ...
WSC's user avatar
  • 101
0 votes
1 answer
62 views

Setup raid for a volume group consisting out of 2 nvme drives

I bought 4 x 4tb nvme volumes. I already tested them and they are doing fine. Operating system is Ubuntu-server 23.04. What i want to achieve is the following: 2 drives act as one. (I think that is a ...
Christopher von Blum's user avatar
0 votes
1 answer
167 views

kubectl get nodes --kubeconfig admin.kubeconfig returns "No resources found"

I am a newbie in Kubernetes. I am not even very familiar with basic kubernetes commands, but the installation is a starting point for my learning journey. I wanted to avoid installing something like ...
Debapriya Roy's user avatar
0 votes
1 answer
61 views

Securing a secret key on a linux server to be consumed by a software running on the server

I'm not an expert in server security and I have a question regarding a situation where server is being compromised. I have a nodejs app which is a bot that only have https connection to read from some ...
Mostafa's user avatar
0 votes
0 answers
286 views

How to upgrade postfix/dovecot/spamassassin/postscreen email server from Ubuntu 20.04 to Ubuntu 22.04?

I am running an Ubuntu 20.04 based LEMP Email server running Postfix, Dovecot, Postscreen, and SpamAssassin. I built the server using this Linuxbabe Guide, and followed the instructions and every ...
DanRan's user avatar
  • 123
0 votes
1 answer
146 views

How to set up the relayhost to send emails to other external SMTP servers using PostFIX?

I am currently configuring an SMTP server on OCI but have some doubts. I would like to send emails with my domain to external servers such as GMAIL, OUTLOOK, and others. I had configured the "...
Shinomoto Asakura's user avatar
0 votes
0 answers
85 views

Docker performance issue with nested Ubuntu KVM

I have an issue with docker performance in a nested Ubuntu VM. Here's the setup: OpenStack Infrastructure My Workstation (A) My Project Host (B) My Project VM (C) Version info: OS: Ubuntu 22.04 ...
Martin's user avatar
  • 61
-1 votes
1 answer
132 views

Ubuntu - Nginx client cert authentication: is a public CA a security risk?

I am struggling with a Nginx setup as reverse proxy with client certificate authentication. The client is only accepting publicly signed certificates to be imported as client certificates for ...
Jonathan Fake's user avatar
0 votes
0 answers
48 views

Softether VPN Client - vpncmd - Two different MAC addresses for one virtual interface

I've encountered strange MAC behaviour in my system - I've got 15 Linux Ubuntu machines with NetworkManager disabled and dhcpcd as DHCP client. Those devices connect to my SoftEther virtual HUB and as ...
CRUDO's user avatar
  • 11
0 votes
1 answer
255 views

Netplan - add secondary IP address and assign label

I saw the same question here, but I can't find it anymore. How can I add secondary IP address and assign a label to it via netplan? I have this netplan config: # This is the network config written by '...
Semyon Bayandin's user avatar
1 vote
1 answer
978 views

Issue with sshd logfile using fail2ban on minimal Ubuntu server 22.04

I am working on trying to get fail2ban set up and enabled for sshd on my VPS with Ionos. I am using a minimal Ubuntu 22.04 server install. fail2ban has installed fine, but getting it to run seems a ...
Sorin Orii's user avatar
1 vote
1 answer
142 views

Ubuntu server 23.10 100% CPU cannot ssh - how to diagnose?

I have a ubuntu 23.10 server running on an arm board. Occasionally it seems to get into a situation where it appears to run at 100% (judging by the pwm fan speed). I can ping it, but I cant ssh to it. ...
ThatDataGuy's user avatar
0 votes
0 answers
51 views

Is it possible to disallow external IPs from accessing a page of a React site?

I'm currently learning React to host a personal website (on an Ubuntu server) and am port forwarding it to allow access from the internet. However, for security reasons, I'd like one or more pages to ...
user avatar
0 votes
0 answers
99 views

NGINX Multi Site * SSL Subdomains: Configuration file error : [emerg] duplicate listen options for 0.0.0.0:443

Currently in process of installing SSL on an NGINX, Ubuntu 22.04 Vultr server. I have two existing domains on the server. Setting up a wildcard SSL for an Wordpress Multi Site (Subdomain base) and am ...
tommyk's user avatar
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0 votes
0 answers
101 views

getting following error on ubuntu 22.04 when trying to ssh into any server. debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Very annoying but solved by uncommenting: vim /etc/ssh/ssh_config Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc
Jonni2016aa's user avatar