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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IP address 'UNKNOWN' in host sshd auth.log when SSH socket is directed to a container

I'm using joshuamkite's terraform-aws-ssh-bastion-service, which sets up an SSH socket with systemd that directs SSH connections to a docker container. I have been attempting to set up fail2ban along ...
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Port Access Between User Directories

Is it possible to set up a server in a user's home directory and provide access to other users in an Ubuntu machine to allow other users to reach to the port of the server by opening connections under ...
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Logging to a MLflow Server in a Different User Directory

Suppose there is a Linux machine with a few users and a MLFlow tracking server is set up in a users home directory. MLFlow tracking server is what you log machine learning model results to examine ...
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Communication between ubuntu server and local client via ethernet

I have a RPi with ubuntu server and a java programm running which i need to access from 1 client only. I want to directly connect them together via ethernet, I already tried to communicate with the ...
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postgresql stopps working shortly after install

I have a ubuntu 20.04 server (root server at hetzner.com if that helps anyone) and I am trying to get a simple postgres running. Installation (following this guide https://tecadmin.net/how-to-install-...
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Postfix wrong sender email

Hello my domain is example.com but when i use the mail command it sends the email with root@mail.example.com What did i missconfigure? Command im sending: echo "Test" | mail -s "Test&...
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rsync error: remote command not found (code 127) at io.c(235) [sender=3.1.2]

I am using the command as below rsync -a --ignore-existing /users/phd/muzafarwan/WRF muzafar@cseprojxxx.xxx.xxx.ac.in: and the error I am getting is as below rsync: connection unexpectedly closed (...
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What is the correct way to enable PHP extentions, manually or via mods-available?

I am used to enabling PHP extensions by manually adding them into my php.ini file, for example: extension=x.so. But today I learned that one PHP extension failed to load because putting the extension=...
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Postfix 550 5.7.1

I setup postfix and i am now trying to send an email using echo “test of email functionality” | sendmail MYGMAIL@gmail.com but i am getting a return email. The diagnostic code: 550-5.7.26 This message ...
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1answer
47 views

How to block IP range with nginx

In my server, I use nginx as web server. This server receives many visits from bad bots. I know how to block specific ip, editing /etc/nginx/nginx.conf file and within the server block, add this line (...
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Is Ubuntu MAAS only for servers?

I'm trying to get my head around using Ubuntu MAAS as a means to deploy clients. All the documentation I see exclusively mentions servers. Can I use the MAAS platform to deploy a regular Ubuntu ...
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Boot diskless client from iscsi target

I have a Ubuntu server 20.04 setup to run the service as an iscsi target. I've accessed and mounted the target from a client (running Debian) and installed a Debian on the mounted block/device. Making ...
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MySQL accessing a lot of deleted temp files

MySQL version: mysql Ver 8.0.25-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu)) I have a server that hosts a MySQL database and Apache Airflow. It was working fine for a couple of months. For a ...
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How do I setup nginx for multiple web app with multiple subdomains in GCE

I am using GCE with LEMP stack. I have multiple subdomains and each subdomain has different root folder. My setup is as below: Production app server { listen 80; listen [::]:80 ipv6only=on; ...
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What does ip addr add dev tun1 local 192.168.69.0 remote 192.168.69.1 mean?

I found the following set of commands to open a tun device on linux that relays things to the internet. However, packets are not relayed back to the tun device ip tuntap add dev tun1 mode tun user `id ...
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1answer
30 views

How to connect from Ubuntu VM on Azure to another without uploading the private key

My Topology Two Ubuntu servers, the edge which is exposed to the internet, and the core which is only connected locally. Both are on the same subnet and the core only accepts SSH from the edge server. ...
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zfs pool status unstable

I've been running zfs pool on ubuntu problem free for years. currently on 20.04 since around beginning of this year I've had to replace 2 out of 4 disks and even then brand new disks started showing ...
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No Internet connection on a VPS [closed]

I've a VPS hosted at cba.pl. I have the problem that I can't connect to the internet with it and i'm just able to use the Terminal over their homepage, but commands like wget and curl are giving ...
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Ubuntu on dl380p gen8 won't boot from SD Card after few restarts and powering off

I have two HP Proliant dl380p gen8 servers with full array (25 disks). I did install SD Card into the internal slot on motherboard. Changed USB setup in bios to Internal SD card first. After ...
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1answer
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No DKIM headers in sent mails from postfix

I have two postfix, one for receiving mails and the other for sending mails, and I am having trouble signing dkim on my outgoing mails. I followed this tutorial. Logs also is not helping me point to ...
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clone a grafana setup to a different server

I'm writing a set of scripts to automatically setup any virgin ubuntu server to be in a state usable for my production environment. One of the things I want to do is setup grafana so that, on install, ...
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Building cURL with NSS on Ubuntu server fails

On a fresh ubuntu 21.04 x64 or 20.04 lts x64 I do: apt install build-essential wget https://curl.se/download/curl-7.77.0.tar.gz tar -xvzf curl-7.77.0.tar.gz cd curl-7.77.0/ apt install libnss3-dev ./...
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Linux what preserves session when load balancing 2 gateway

I use 1 ubuntu as gateway with 2 gateway internet: eno3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether d4:be:d9:f8:82:7a brd ff:ff:ff:ff:ff:ff ...
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tunnel hurrican electric ipv6 /64 block to squid proxy on ubuntu

I have an ipv6 /64 block I got from tunnelbroker.net. I want to create a proxy pool of all the ips available in that block (18,446,744,073,709,551,616 ips). I searched all over the internet but didn't ...
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1answer
56 views

Installing ASP.net on Ubuntu 20.04

I'm trying to add ASP.net onto my Ununtu 20.04 server. As per: https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu They tell you to: wget https://packages.microsoft.com/config/ubuntu/20....
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openstack selfservice network setup

I'm trying to configure the selfservice network on Openstack Wallaby, running on Ubuntu Server 20.04. I have followed the instructions for everything under the "Minimal deployment for Wallaby&...
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VM in proxmox shows more RAM then assigned?

I assigned 10Gb of ram to my VM but inside the VM it mentions that it has allocated all the ram available in my server (48). Why is this happening? I have a windows VM aswell and there it just shows ...
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Ansible playbook not running : Import error

enter image description here ansible-playbook -v -i Monitoring/hosts Monitoring/main.yml [WARNING]: log file at /var/log/ansible.log is not writeable and we cannot create it, aborting Using /etc/...
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Ubuntu SFTP hide unauthorized subfolders

I currently run Ubuntu 20.04 Desktop server. And I am using the SFTP function by installing OpenSSH on the server. For testing purposes, I temporarily created a directory called /home/mydirectory/...
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Cannot Access Mail Folder Content Since Dovecot Switched From MAIL to MAILDIR During Update

*See UPDATED & UPDATED AGAIN to jump to the issue at hand. Just discovered that my mail app(s) are not displaying all of my messages in my SENT box(S) and maybe other boxes. For example when using ...
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1answer
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How can my users discover my upstream server IP though they only connect through load balancers?

I am managing a game server prone to DDoS. I have kept the upstream IP secret and only published the addresses of 100 load balancers forwarding traffic via iptables: echo 'net.ipv4.ip_forward=1' >&...
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Someone mining xmr on my vps [duplicate]

i noticed one cpu core using 100% resources so running htop shows, xmrig is running which i never installed. and i can see it is running from path /tmp/xmrig-... and i am running a wordpress site here ...
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76 views

SSL error from AWS server in us-west-1 to eu-west-1

Server's in us-west-1 region while tryin to connect https://elasticloadbalancing.eu-west-1.amazonaws.com/ in eu-west-1 region curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL. This is happening with ...
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NGINX Is redirecting to localhost:3000

I'm using ruby on rails in a docker container running my website https://redrebelgames.com on port 3000. I'm trying to setup NGINX to redirect http:// traffic to https:// and redirect port 80 to port ...
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How to forward all incoming traffic to server A to server B and B returns it to A?

Suppose I have two servers: A and B. On both I have installed WireGuard. On server A, wg0 is routed with IP 10.8.0.0/24 and on server B, wg0 is routed with IP 10.7.0.0/24. Let's say server A's ...
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27 views

Identifying specific devices when using sensors in ubuntu

I am running the sensors command in Ubuntu 20.04 to try and get a temperature reading for my NVME SSD drives. However, although I can see the drives I am not sure which one is which: nvme-pci-2300 ...
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Cannot connect MacOS to StrongSwan VPN server installed on ubuntu

I have an issue connecting to IKEv2 VPN running on an Ubuntu VM on GCP. I am trying to connect with MacOS and Windows. I followed this tutorial to install the VPN on an Ubuntu VM. I need a VPN so that ...
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1answer
42 views

How to install `aide` without `aide-common` in debian?

Per this post, Newer versions of Ubuntu (including 14.04) come with two packages for AIDE: aide, with the aide command and manual page, and little else aide-common, with a wrapper around that ...
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Set display settings for another user in ubuntu [migrated]

I am using ubuntu 20.10 on a laptop and I have the close lid setting to ignore so I can close it and it still works on my external monitor. I have added a new user, but when I log in as the new user,...
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1answer
63 views

Apache2 - Only home url is found

I have created a laravel 8 application and installed apache2. My configuration files look like the following: 000-default.conf <VirtualHost *:80> # The ServerName directive sets the request ...
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13 views

Allow to kill mounhelper to all users

I have some machines with kubuntu 20lts, everyday when the machine start and the user's login, smb4k mount shares. But sometimes some shadows didn't mount because mountheper hungs. I need to allow all ...
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24 views

MDADM Raid 5 stuck on “Check Status 98% Complete”

I have an ubuntu server running that works like a NVR and stores recordings from a IP Camera over the network. It worked fine for a little over a month, then today when I went to check on it, it hadn'...
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1answer
53 views

Cannot apt-get update from inside my docker container if connected to bridge network

I am trying to understand, why I am unable to run apt-get update from within my docker containers, either debian:latest or ubuntu:latest. I am able to ping 8.8.8.8 or other address from within the ...
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26 views

avahi stops working in multi-user.target

I have another machine on my network running avahi-daemon with the default configuration and it's been working fine since the first boot. On a newer machine, avahi-daemon works only if i set systemctl ...
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Ubuntu does not boot without -cpu host, but boots fine with it

qemu-6.0.0 I'm running some experiments with QEMU/KVM and faced some strange behavior. My Ubuntu 20.04 system installed on a VM does not boot if it is used as follows: $ sudo qemu-system-x86_64 -...
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451 4.3.0 Temporary lookup failure - iRedMail - Ubuntu Server

I'm new to this area and I configured an ubuntu server with iRedMail. It receives from gmail.com but when trying to send emails using PHPMailer (SMTP) I get the following error. Tried to figure out ...
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15 views

Linux partition sizes for a locally-deployed (via docker) django web application with postgresql database

I plan to deploy in an ubuntu server, via docker, a django web application with postgresql database in a local machine within a local network. I believe that docker volumes live in the /var/lib/docker/...
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grub rescue on Ubuntu 18.04 with btrfs partition

I have a small server (HP ProLiant MicroServer Gen8) running Ubuntu 18.04 64 bit with the latest HWE generic kernel (5.4.0.74.83~18.04.67); it has two SATA drives, GPT partitioned but booting in ...
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file ownership and permissions issue with phpBB on Ubuntu 20.04 VPS

I am porting a phpBB site from a shared server to a VPS, running Ubuntu 20.04. I have configured apache2 for virtual domains, since I have more than one. Here's where the boards are: /var/www/...
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1answer
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Got Blacklisted By DNSBL Or Gmail [closed]

I’m trying to build a mail server, but when I tried to check the if TCP Port 25 (outbound) is blocked I got the following root@mail:~# telnet smtp.gmail.com 25 Trying 173.194.76.109... Connected to ...

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