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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curl X POST command fails on win10 but succeed on MacOS/ubuntu

When I use curl -X POST --data ... in win10 terminal (as admin) for RPC call to retrieve API version running on a remote server, it fails with error: {"code":-32700,"message":"...
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Microk8s ( Kubernetes ) for Mysql High- Availability

I am trying to setup MySQL HA Database with Microk8s Kubernetes. The goal is to have MySQL running on all 3 nodes with 1 floating IP in between them, and that if any of the nodes bursts up in flames ...
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accessing a computer from anywhere

I am setting up a workstation for work and I would like to set it up in a way where i can access it from anywhere. Doing this from a local network is easy, i can just ssh into it. However, i would ...
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Accessing VM Ubuntu Server's FTP by redirecting the ip and port

So I got Ubuntu Server 20.04 VM(Virtualbox) installed on Ubuntu Desktop. How do I redirect the FTP if it will be accessed by the Ubuntu Desktop's IP (192.168.8.11:21)? (see the Network Topology)
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Apt upgrade “Failed to fetch” linux-firmware on several machines, but wget -> dpkg -i succeeds

I have a few Ubuntu servers that I manage that are all exhibiting this behavior. Most are 20.04, but one is 18.04. asmith@hostname:~$ sudo apt update ... many lines ... 1 package can be upgraded. Run '...
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Nginx trying to load image files from server root rather then project root location

Quick question, shouldn't be too hard... hopefully. I'm running Nginx with two Laravel projects being hosted. The following directories are where they are being stored. /var/www/site.kara /var/www/...
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Netplan fails to bring up VLANs

I'm trying to have a properly configured Ubuntu 20.04 server network at boot. I have an physical interface connected to a trunk so I want to define some vlan tagged interfaces on it. I'm using netplan....
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Kubernetes on-premise setup?

I would like to know how to setup a kubernetes cluster on my Ubuntu 20 DPS I mean, I have installed docker and kubeadm I know how to make a deployment, service and little of ingress, I have used an ...
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BUAgent backup agent using 4GB of memory when not running - Ubuntu Server

A BUAgent program installed on one of our servers looks to be using 4GB of memory. The server only has 8GB. BUAgent only runs out of hours to backup the site anyway. Running htop you get the following....
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236 views

How to get a proper prefix length from DHCPv6 server?

I have two virtual machines with Ubuntu Server 20.04. One of these virtual machines is a DHCPv6 server, and the other one is a client. I am able to set an IPv6 address on the client, but I cannot ping ...
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iptables not blocking only IPv6 IP's on Ubuntu 20.04 with iptables-persistent, IPv4 OK

I have Ubuntu 20.04 VPS (LEMP) and installed iptables-persistent. In this server, I have installed fail2ban and configured with CloudFlare to ban fail2ban banned IP's. Also, I use the CSF. I use a ...
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How to make sure docker service will start after containerd upgrade?

this morning I woke up to a 'service down' email I have received from watchdog. After connecting to the server I have found the docker service down. After little investigation, I have found that this ...
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How to make exim4 deny other ips from sending mail using the server?

How to make exim4 so that it only allow smtp connection to send mail from 127.0.0.1 only. but also recieve mail at the same time. I am confused with this because if I change dc_local_interfaces to 127....
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Where is /etc/nginx/sites-available on a Plesk Ubuntu Server?

Hi i've just got an ubuntu VPS with plesk control panel. I am trying to get asp.net core setup with reverse proxy as per https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/linux-nginx?view=...
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“Docker-compose run” shows backend running but can't access from host

I was trying to use docker for my flask backend along with postgres database. Here is my docker-compose.yml file version: "2" services: api: ports: - 5000:5000 build: ...
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AD user locked out of Ubuntu server

Our ubuntu server is joined to our Windows domain and a group of users are allowed to SSH into the server. One of the admins has somehow locked his account and he cannot SSH into the server anymore. ...
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Jenkins won't start properly

On a freshly installed Ubuntu 20.04 I have set up Docker and installed a Jenkins instance within Docker. To do this I issued the following commands: sudo apt update mkdir jenkins sudo apt install ...
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Installing Ubuntu Server on AMD chipset RAID array

I'm trying to install Ubuntu Server on a TRX40-based baremetal machine. In order to ensure the availability of this machine, I want to boot the OS from a RAID1 array. This has proved harder than ...
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Why netcat listener inside of an Ubuntu docker container silently ignores specified port in favor of a random one?

I would like to spawn a netcat listener on a given port inside of a docker container in order to manually debug incoming requests, but netcat's behavior inside docker seems different from what I used ...
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How to recreate boot partition to boot my ubuntu on mdadm

I installed ubuntu 20.04 on esxi 7.0. 4ssd passthrough as raid 10 mounted on /, with a virtual disk as boot partition. now virtual disk lost. how to recreate boot partition to restore my system?
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Ubuntu 18.04 UFW setup

I have one application running on two ports HTTP on 8080 and HTTPS on 8443. I want everyone to have access to port 8443 and whitelist 8080 to an IP, so only a particular IP can access the port. So I ...
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MongoDB keeps crashing--is it running out of memory or CPU?

I have an issue where MongoDB keeps crashing on me: $ sudo cat /var/log/syslog -> Nov 28 14:06:58 ns557017 systemd[1]: mongod.service: Main process exited, code=killed, status=6/ABRT Nov 28 14:06:...
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Access subdomain through SSH connections only

I want to make a subdomain on an Ubuntu 20.04 Server that has a LEMP stack installed. I am connecting to this server through SSH with a private key authentication. I want to restrict all access to ...
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Error: Can't find bundle for base name ncs_rest_sim, locale en_us when running devspace/ideamart simulator on ubuntu

I get this when trying to run devspace/ideamart simulator on ubuntu 20.10 with java version "1.8.0_271": HTTP ERROR 500 Problem accessing /. Reason: Can't find bundle for base name ...
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How to install gmod server as system service on Ubuntu?

I have a GMod server on Ubuntu 18.04, and it runs fine when I run it via ./run_gmod.sh (as the "steam" user, who owns the folder/files), whose contents are #!/bin/sh /datadrive/srcds/gmod/...
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Puppet copy and install program on users

Trying to write module to install nomachine on every user how created on ubuntu deskop. I need assist to solve two problem: nbadmin its my user but I woluld like to write genral user second I got ...
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What tools do you use to manage your Linux Server?

I'm a starter, just started using a VPS (headless Ubuntu server 20.04), I was wondering what tools are the most relevant for configuring, managing, monitoring Linux Servers. And maybe also some Tools ...
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Spammer is using Port 25 to send SMTP HELO / maybe as well mail

I would like to know how to identify the script a spammer is using to send out SMTP HELO requests as keqakku.com via Port 25. I have already used several scanners like chkrootkit & rkhunter wiht ...
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1answer
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Ubuntu Allow Specific IP to a PORT

I have a service running in ubuntu 18.04 machine at a port 8080, I want specific IP should be able to access this service and other should get blocked. How i can configure my machine to whitelist a ...
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Set the limit of sent / received packets

My vps server provider limits me to 50,000 packets per second. After exceeding the number of packets, the link speed slows down to 1Mbit / s. Is it possible to set the ubuntu system not to exceed 50,...
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authorization Error Error 400: invalid_request Permission denied to generate login hint for target domain. site:stackoverflow.com

I posted this question on overflow and they told me to post it here. For some background: Im trying to use react-google-login on my react app in my AWS ubuntu server. I followed the advice given by ...
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Connection refused on remote (sles) server port, even though inside that server port shows as open

When trying to connect to port 7077 to a spark cluster via pyspark in Python, I get Connection refused Error. Running nmap server_ip from my local machine (Ubuntu 20.04) shows 4 open ports (80, 8080, ...
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Cannot ping to/from IPv6 address obtained from DHCPv6 server

I have two Qemu virtual machines with Ubuntu Server 20.04. I would like one of them to be a DHCPv6 Server. I am able to get IPv6 address on the client from the server, but I cannot ping to and from ...
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Outgoing Mail not working after changing port 25

I want to block Port 25 as my IP got blacklisted multiple times due to some spammers using my server. I've changed the Port to 578 in Postfix and restarted postfix & on top I've as well changed ...
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Postfix + gmail: greeted me with my own hostname localhost

My emails for my domain name is hosted by gmail and I have set the mx records to google's in my domain host. So my emails were working perfectly. But after I have my domain name (nameservers) pointed ...
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1answer
39 views

Can't recieve emails with Postfix/Dovecot telnet returns status0

I try sending emails to my address and I can't find any record of them, even in the logs. I can send to myself on the server just fine. When I try telneting onto my server I get the following answer ...
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Posible to host a server that deliver the content of other server(B)

Hi my current condition is i run a Whitelabel sites. let say it is www.example.com ( i dont have server access ) only has access to the CMS. the site itself has users based that can log in. Is it ...
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Recuperar propietarios de archivo de Ubuntu tras uso inadecuado de chown [closed]

Cometí el error de cambiar el propietario con el comando sudo chown -R usuarioG: usuarioG / Ahora, no sirve MySQL y otras cosas, intento reparar pero el comando sudo no funciona Da este error sudo: / ...
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Accidental chsh command leads to broken PAM authentication

I accidentally ran the command: chsh -s bash as root and now no password authentication works for root or any users. I have a single SSH session from which to fix it. I can't even open a second root ...
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Ubuntu 20.10 Active directory integration not working

I've just installed Ubuntu 20.10 and I enabled Active Directory integration during setup. It asked me AD user and password, I provided those and the setup showed green thicks and went on. After ...
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Guidance on home network configuration [migrated]

I am trying to set up a home network with the following requirements Interconnectivity between two internal networks Internet connectivity from internal network The flow of traffic is like this: ISP ...
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Random network disconnects (Ubuntu 20.04)

I recently had to move my lab ubuntu server (20.04) to another VLAN. Technically, the entire network bit it and I had to set it all up and I cleaned up some VLANs in the process. Didn't change ...
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26 views

Is it possible to dump memory from one Ubuntu VM to another?

I'm trying to use Azure VMs to host a game server for me and some friends since spot instances are cheap, but the downside is that they get deallocated/deleted pretty quickly in practice (somewhere ...
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9 views

Check Point Endpoint Security VPN Connection with SecTrail MFA

I can connect a VPN by using Check Point Endpoint Security VPN tool in Windows 10 with SecTrail Authenticator, and now trying to do this in Ubuntu. Can you please explain how I can do that in Ubuntu ...
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1answer
44 views

Ubuntu 18.04, 1.5G Swap 100% used (32G RAM), soft RAID1. How to increase SWAP size?

I have a production server, recently, I have seen server becomes slow sometimes, and SSH is slow, and once get into the terminal, even press ENTER is slow. When the server is OK, I checked the memory ...
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1answer
18 views

How to add username or change password in vsftpd in Ubuntu 16.04?

I have gotten access to a server which is configured by another person and I am now at the point where I am not able to access through ftp due to the fact that I do not have the ftp username and ...
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1answer
63 views

Self-Hosted Github runner, how do privileged commands work?

What I'm trying to achieve: A fully automated deployment for a React App, on any commit to the live branch, by my own defined Github Runner, which is running Ubuntu Server 20.04, with npm 6.14.8 What ...
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16 views

SqlServer on Linux Linked Server

On a local network I've 2 Windows Servers running MS Sql Server, respectively 2016 Standard and 2017 Express. I recently added an Ubuntu 20.04 server with SQL Server 2019 Express on it. Also installed ...
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1answer
48 views

How secure is a “root” password that's 26 alphanumeric characters long?

I was playing around with a DigitalOcean droplet. Linux Ubuntu 18.04. I had a root password about 8 alphanumeric characters long. Port 22. It would take about 3 days for hackers with Chinese IP ...
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SSH connection strange behavior

I am using windows10 and I can connect to my server(Ubuntu 18.04) with PowerShell and Putty. but not with the other two ssh client I have (MobaXtrem,Bitvise). but when i turn on my VPN(SeedVpn) on ...

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