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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LINUX:how to find time+ in top?

i m implementing my own top command .i just cant find out where to find SHR(shared memory),TIME+(process start time) and mem% of each process from proc. please reply :)
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Nginx: public website and anywhere access vpn routing

I have a nginx server with a https site hosted on it. In my network I also have windows anywhere access running (VPN, RDP ,xyz.remoteaccess.com etc). How do I setup nginx to allow the public to view ...
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Change the root folder in a ubuntu server, using nginx with serverpilot [duplicate]

Right now there is a ubuntu server using amazon EC2 and serverpilot to build. The web files structure is like this: 1) /srv/users/serverpilot/apps/**site_a**/public/wp-content .. 2) /srv/users/...
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45 views

How to properly setup squid3 as HTTPS proxy?

I am trying to setup squid3 as an HTTPS proxy using the tutorial given here. I have properly setup the proxy settings in my browser and when I try to hit HTTP web sites, I am able to connect ...
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22 views

How to forward port through VPN on Linux

I'm setting up a small CTF (hacker competition) and have a machine that hosts VMs. One of these VMs will be the target. The host machine cannot be reached through the internet, so I have set up a ...
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37 views

What is the correct way to configure match rules in sshd_config?

I'm configuring Match rules in /etc/ssh/sshd_config . Whenever I add more than 1 match rule and after restarting SSH ofcourse, I'm getting locked outside of the machine with the following error: [...
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1answer
47 views

Stop and prevent brute force attacks on Ubuntu 14.04

I've currently 3 servers with SSH service being attacked by brute force. The attack is from multiple sources or one who's changing his IP with each attempt performed. I need help to stop current ...
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16 views

Arch Linux install without root password

Is it possible to install (and later maintain) Arch Linux (or some of its derivatives) without ever setting root password - using only user account and sudo? The same way it's done in Ubuntu and many ...
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22 views

Cannot install libopencv-dev on Ubuntu Xenial

Has anyone else seen this problem? I'm trying to install OpenCV in Ubuntu Xenial LTS. I've tried to uncomment the deb-src entries in my /etc/apt/sources.list and still not working. sudo apt-get -f ...
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74 views

OpenFire authentication against Samba Active Directory using StartTLS

I am trying to authenticate different services (specifically openfire for now) against Samba Active Directory over StartTLS (port 389). While setting openfire up, I checked this option (Use StartTLS),...
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14 views

auditd - Getting only EXECVE in ausearch?

I'd like to use the auditd daemon to log whatever is run as or by root on our servers. To that effect, I added the following lines to /etc/audit/audit.rules: # Log all commands run as (or by) root -a ...
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22 views

Client route for OpenVPN Access Server

I am running OpenVPN Access Server and I'd like to push a route to every client on connection that is the equivalent of: sudo ip route add 172.17.0.0/24 via 172.27.232.1 Where should I go to set ...
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22 views

Samba is ignoring file and directory create permissions

I am trying to create a SAMBA share but as usual I get a bunch of permissions problems. Here is my setup: [global] workgroup = WORKGROUP security = user map to guest = bad ...
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1answer
51 views

Ubuntu 16.04 LTS with ZFS hanging on boot

Ubuntu 16.04 LTS host won't come back up after maintenance reboot. Seems to hang when it tries to bring up ZFS. Last message in the console is: Starting import ZFS pools by cache file... VERIFY(rs ==...
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ubuntu script - switching users in script and deleting previous user

On an AWS EC2 Ubuntu Instance I want to run a setup script that creates a new system admin (let's call it deploy) delete the default ubuntu user and continue the setup as the new deploy user. ...
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1answer
38 views

slow vnc connection to a vmware workstation virtual machine

I've got 2 computers : -host in which is installed workstation 12 and a VM called "guest" (linux) - a laptop, in the same room as the host I get a fine wired connection between the 2 computers (host+...
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46 views

Allow FTP access by a single IP. Restrict all other

I'm using Amazon EC2 Ubuntu instance and want to block all IP except a single IP. So outside my network no one can connect with FTP. I've already tried with following. in vsftpd.conf tcp_wrappers=...
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6 views

In snmptrapd is it possible to forward and execute a script for each trap?

I want to both handle the trap with a script and forward the trap to a third party system is this possible with snmptrapd?
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53 views

Kali Linux Running in AWS

Normally I run Kali in a virtualbox VM however due to the nature of a project it may be useful to run Kali from an AWS EC2 instance. So imagine my joy when I learned there was a Kali AMI only to be ...
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22 views

Subdomain always redirects to main domain in ubuntu [closed]

I've created a subdomain in ubuntu server which is in azure cloud ,but it will always redirect to main domain Here is my apache.conf file <VirtualHost xx.xx.xx.xxx:80> ServerName admin....
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36 views

High memory usage, but not clear where it goes

My system is a software network intercepter, which runs on a Ubuntu 14.04.4 LTS (GNU/Linux 3.16.0-71-generic x86_64). I have it deployed in several sites, yet a specific one gives me the following ...
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1answer
28 views

Error While installing Ruby on rails

I am consulted this document (How To Install Rails and nginx with Passenger on Ubuntu). Currently i am using Ubuntu 14.04.4 LTS. This time i am first installing ruby with rails.. how can i fixed this ...
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62 views

Server crash (504 gateway timeout) with 100 concurrent users, using nginx and php5-fpm

We have a VPS server which is dedicated to a single website. Day to day it seems to work fine (say 20-50 concurrent users) but as soon as we get up to around 90+ concurrent users, the server starts to ...
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15 views

libnss-ldapd and Onelogin vLDAP

I'm trying to get Onelogin's new vLDAP service working with libnss-ldapd on an Ubuntu server (14.04). It looks like vLDAP uses authenticated bind per user. I've tried lots of different configurations ...
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31 views

Dnsmasq - assign different subnets based on MAC address “family”

I have an experimental network with about 60 client machines. The client MAC addresses are all divided into 3 "families" with different address beginnings. The server is an Ubuntu machine running ...
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1answer
8 views

Ubuntu - accessing folder with two groups

I have a two groups: www-data and editors groups. Consider I have a folder /home/mydata/ and I need to allow access folder both groups. I have tried: chown -R www-data;editors /home/mydata But www-...
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29 views

Unable to install specific version of apache2

I pretty new to this, My distro is Ubuntu 14.04, I have installed apache2 latest version, which is available in repositories,(i.e.,2.4.7-1ubuntu4.9). I have used this command,apt-get install lamp-...
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1answer
24 views

ubuntu apt-get for an offline installation

We are using apt-get install -d do download all the required packeges from our installation in order not to need internet. The thing is that apt-get isn't downloading what is already installed and it'...
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2answers
47 views

What is the most efficient way to transfer files from AWS S3 to S3?

I have a large number of files stored in an AWS S3 bucket. I need to get those files to another S3 bucket owned by another user and in a different region. The files are stored in different locations ...
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81 views

How to allow users on an openLDAP server to create, update, and modify users under a certain organizationalUnit?

I have been stuck on trying to allow openLDAP users that are in a certain group (EX: cn=Admins,dc=mydomain,dc=com) to create, modify, update, and delete users that are in another organizationalUnit (...
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ufw not working on openvz vps

I'm trying to make ufw work for an Ubuntu 14.04 vps using openvz. All questions about this problem (like this one) lead to the same site. This one: http://blog.bodhizazen.net/linux/how-to-use-ufw-in-...
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26 views

Remote host identification has changed

I'm trying to connect serverpilot manually on a cloud server at OVH (unbuntu 16) via the terminal on my mac (ssh root@vpsXXX.ovh.net) The operation failed once and now that I'm trying to re-setup it ...
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1answer
20 views

forwarding emails via postfix, smart routine to actively check that it works

I have a domain registered at namecheap and run my website on a digitalocean droplet. I have successfully set up email forwarding on the server with postfix, such that emails sent to name@example.com ...
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25 views

LACP - Load Balancing Network 2Gbit Ubuntu

I have configured my server as bonding interface to achieve 2Gbit network speed but it seems ubuntu can not go over than 1gbit and the outgoing traffic from server is not balanced over 2 interfaces. ...
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59 views

Failed to bring up eth0; can't establish any network connections

So for 1,5 years now I was running a DigitalOcean droplet without any problems. did apt-get upgrade several times, changed some things - all fine! Last night suddenly all my alarms went off and my ...
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netstats shows my own server is hitting a server its not supposed to know about

ON AWS I have a few dedicated servers that do image processing and they seem to get high traffic and fail. when running netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I ...
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8 views

How to set an ACL in OpenLDAP to allow a user to fully manage an OrganizationalUnit? [duplicate]

I just installed OpenLDAP on my Ubuntu Server 16.04 LTS. I have my OpenLDAP server setup as depicted in the image below: Just like the image depicts I would like the blue color coded cn=admin to be ...
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41 views

Rabbitmq -> epmd reports: node 'rabbit' not running at all?

ubuntu@ip-172-31-21-62:~$ sudo service rabbitmq-server start * Starting message broker rabbitmq-server [ OK ] ubuntu@ip-172-31-21-62:~$ sudo service rabbitmq-...
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16 views

Connection between Apache2 and xsp2 for an Ubuntu Linux 16.04 system which serves mono ASP-NET content to an web browser user

I would like to know what the relationship is between Apache2 and xsp2 for an Ubuntu Linux 16.04 system which serves mono ASP-NET content to an web browser user requesting an WebForm, hello.aspx. Is ...
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1answer
40 views

about do-release-upgrade on ubuntu server lts

i'm working on a cloud server running Ubuntu Server 12.04 LTS and i was wondering to know what happen if i do a do-release-upgrade to the new stable version Ubuntu Server 14.04.3 LTS. Since i'm ...
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2answers
93 views

Efficient parallel remote file copy

I'm looking for a way to distribute a big folder (~40-60g) to multiple servers (4 or more). A simple scp command in a loop is working already. I would like to have a faster method but simply ...
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60 views

How do I ignore unmet dependencies while using apt-get remove?

I have a thin VPS running Ubuntu 14.04 with automatic security updates. It has filled up the /boot partition with a lot of kernel updates. I am trying to remove the older ones, but I'm running into an ...
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9 views

Ubuntu Samba ssh login changes after successful login

We have many Ubuntu servers running different flavors, but on some of our 14.04 versions we are having a baffling issue with ssh logons. When a user uses ssh to connect, they are prompted for their ...
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33 views

DNS request has status: SERVFAIL

Can you please take a look at the below config and what I am doing wrong? Just set up Ubuntu 14.04.4 LTS with bind and when I do a dig to my server I get a status: SERVFAIL My configuration is the ...
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1answer
118 views

DNS issue with Failover IP from Hetzner

Assume we have two servers A and B with 'real' and external IPs and we can switch the so called 'failover ip' (W.X.Y.Z) to point to a specific external IP of A or B. This works from the 'outside' and ...
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2answers
55 views

/dev/sdc1: unable to read superblock

Linux Ubuntu 14.04 (azure server) I was trying to backup /dev/sda1 drive so I executed the sudo dd if=/dev/sda1 of=/dev/sdc1 command. While executing the command is available, the space was ...
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51 views

Let's encrypt allows only one vhost per file on ubuntu/apache

Currently I am trying to set up let's encrypt on my Ubuntu 16.04 server. I am using Apache 2.4.18 as my webserver and also passenger. I am using the following command to generate my certs and to ...
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How to re-compile iconv on Linux (Ubuntu 14.04 LTS) with pseudo-charset UTF8-MAC?

I was googling around for hours to find a solution for my problem and I couldn't get it to work: I have to rsync a file structure on an ext4 formatted drive to a hfs+ formatted drive. Folders and ...
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38 views

Occasional “could not execute mail delivery program /usr/sbin/sendmail”

I seem to be having an infrequent issue with PHP and sending email. Most of the time it works fine but occasionally the email doesn't get sent. Looking in the website logs I can see a bunch of these ...
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21 views

How to choose AWS EC2 instance with highest bandwidth for downloads?

I am about to create a new Ubuntu Server EC2 instance. However, there appears to be very little information regarding the bandwidth available for each instance type. The server will be primarily used ...