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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Relay Access Denied - Postfix/Dovecot

Edit: Please, please read the answer before this whole thing, as it'll save you tons of time. Answering my issue was as simple as changing a setting with Outlook, it might be for you, as well. It had ...
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1answer
34 views

Is there a possibility to have a web ssh interface? [closed]

is there a way to make a web interface for ssh on Ubuntu? Something like Digital ocean's method is what we are currently in need of.
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1answer
79 views

Temporary Lookup Failure - Postfix/Dovecot

Alrighty... So here's what's going on. I can sign in with Outlook to my Mail Server, but when I go to send an email, I get this error. Using SquirrelMail, I don't get any errors, sending works fine. ...
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votes
1answer
47 views

Block everything except some ports and specific IP Addresses, server can't do HTTP GET

I can't get this firewall.sh script to work. It currently doesn't allow me to get a file at 'https://index.docker.io/v1/repositories/library/ubuntu/images' so either my DNS is flawed or I am blocking ...
1
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1answer
70 views

MHDDFS randomly breaks

I am using MHDDFS to pool a bunch of large disks together into a single filesystem that I can easily share across a network. For some reason every now and then the virtual filesystem seems to fall ...
1
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0answers
33 views

Hadoop namenode port getting blocked

I have installed 7 VM instances of Ubuntu 14.04 LTS servers. First instance runs the namenode service and all other 6 nodes run datanode service.I think my NameNode is getting crashed or blocked due ...
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0answers
20 views

xen gentoo domU (Ubuntu 14.04 LTS dom0)

I have a few Ubuntu 14.04 LTS Xen 4.4 servers and I would like to add Gentoo guests. However I am not sure how to do that. Does anyone know where I can review some examples? Also does it have to be ...
0
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1answer
34 views

Revert libvirt external snapshot

Having some issues understanding how to revert snapshots on ubuntu 14.04 using KVM... Until now i have been using internal snapshots, however due to space issues (space not being re-allocated after ...
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1answer
136 views

samba public share on ubuntu 14.10 not working no matter what i try

I have a share folder in this location and im trying to share using samba (Version 4.1.11) in ubuntu 14.10 /media/aravinda/f6c682f3-5271-4f2b-99e8-93aa3bd39990/share ...
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0answers
18 views

Run compiled kernel with mcp251.x support

I have jetson tk1 board with ubuntu 14.04 pre-installed. I want to add mcp2515 functionality to it. How can I get it running? First of all, I set up the support of can bus in kernel and make and ...
1
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0answers
95 views

Multiple networks per interface in OpenStack in Hetzner

I'm trying to run a small OpenStack setup over a few servers hosted in hetzner.de, I'm currently deploying a basic setup to two servers. All servers are running Ubuntu, they are connected to each ...
0
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1answer
110 views

Iptables block layer 7 DDoS attacks

Recently I've been experiencing lots of layer 7 ddos attacks to my website. Specifically an HTTP GET request flood on the index page. (~20k r/s), my server is at OVH, so it's not overloading the pipe, ...
0
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1answer
52 views

SSH public/private authentication failing in Google compute engine instances

I have two instances (host names are namenode and datanode1 ) of Ubuntu 14.04 LTS running on Google compute engine. I am struggling setting up ssh root access to between them. I am providing some ...
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votes
2answers
60 views

Ubuntu mail command - where does it store sent mail?

I am very new to Ubuntu and have an issue where sent mail from our Ubuntu Server has been failing for a number of weeks. We are using the mail command (invoked from PHP) like so: ...
-3
votes
1answer
73 views

No longer able to send e-mails from Ubuntu server to Gmail group [closed]

I have an issue where sending e-mail from our Ubuntu server to a Google Group account no longer works and results in the Google group rejecting the e-mail. (Please note that when I say Google Groups, ...
1
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1answer
83 views

Make DNS server know of it's ADDC server

I have a problem and haven't been able to find an answer for it on the googles, so now I ask you I have 2 servers: Server A, ubuntu 14.04, running DNS/DHCP through bind9 and isc-dhcp-server Server ...
0
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1answer
26 views

Runit logging not working

I created a service with runit. Service starts and falls without logging. I need information about STDOUT of service for error detection (service starts without runit properly). I created a ...
1
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0answers
34 views

Ubuntu Router to connect two networks via IPv6

I am currently in the situation that I want to add one network of homogenous linux nodes to an already existing windows network. For administrative reasons the linux nodes are not going to be added to ...
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0answers
28 views

Ubuntu 14.04 bonding changing primary interface

I have a server with a fresh install of Ubuntu 14.04 server. Im trying to set up bonding but for some reason, one of the interfaces when made primary does completely shuts down the link (ssh, ...
0
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1answer
118 views

Relay Denied SMTP error from remote mail server after RCPT TO: <email@example.com>

Hi I have a problem when I want to send mail using smarthost method in exim and usage Mailgun as SMTP server for relay. this is my configuration dc_eximconfig_configtype='smarthost' ...
0
votes
1answer
12 views

Smartmontools ouput anlysys

I am trying understand the smartmontools, when I executed the command "smartctl -a /dev/sda" It shows the part of output with heading"SMART Self-test log structure revision number 1" under which a ...
0
votes
1answer
102 views

Ubuntu 14.04.2 LTS - RSysLog 8.8.0 - omusrmsg not working

I have been trying for two days to get RSysLog to alert all [or specified] users of certain Facilities/Priorities hitting RSysLog. rsyslog.d/50-default.conf: ... *.emerg ...
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2answers
288 views

How to install build-essential on Ubuntu 12.04 - gcc and g++ dependency issues

I have just installed Ubuntu server 12.04 LTS. I am trying to install build-essential package; however, when I try to install it I receive the following error: Some packages could not be installed. ...
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1answer
23 views

SSH port blocked EC2

I had installed Tomcat on my EC2 instance . However i was unable to access it using my public IP:8080 . So I followed the instructions mentioned in the post ...
0
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1answer
59 views

DELL R320 boot with USB disk drive

I need to boot a DELL R320 server from a USB (3.0) disk drive with Ubuntu 14.04 Server. With a USB pen flash (LiveCD) it boots correctly but with the USB disk it says there is no bootable device. ...
0
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1answer
63 views

Where is the bottleneck - nginx slow file serve

I have nginx 1.6.2, on Ubuntu 14+. I host a couple of "big" files - from 20mb to 60mb - which are constantly accessed (it could be more then 1000 connections simultaneously at evening peaks). They ...
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1answer
28 views

How to migrate /var back into the main partition [duplicate]

I have two harddisks, mounted on / and /var I need to migrate the /var partition back into the / partition. What are the steps required to do this?
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2answers
55 views

How can I clear logs in docker

I've started to try to use docker containers. After a few weeks of use, I realized that all log messages, since the beginning of the container, are still there. Once this old logs are no longer ...
-1
votes
1answer
137 views

Can't restart nginx, bind() failed (98: Address already in use)

I know this topic exists in various different forms, but I'm having trouble solving my problem. If I run service nginx restart, nginx fails with the following log: 2015/03/14 08:36:42 [emerg] 9400#0: ...
2
votes
0answers
45 views

NFS randomly mounts wrong server

I have run into a problem with NFS which has me baffled. I can't even come up with a plausible explanation for it. I have ten machines: slave1 (10.0.0.10) - slave10 (10.0.0.20) Each one runs NFS ...
0
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0answers
81 views

Ubuntu MySQL/Jetty unexpected server halt - hardware or software?

I have a MySQL 5.7, jetty 9, and NGINX 1.6 server running ubuntu 14.04.1 in digital ocean. It has zero security updates waiting to be installed and iptables blocking access to everything except for 80 ...
0
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1answer
29 views

Network install OS and a few packages on 10 systems

This is something that I am currently working on. I have 10 systems, that I would like to configure with lubuntu and virtual box. Now, I know about network installation with PXE. I tried to do this ...
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2answers
35 views

How to Disable ModSecurity without any Errors

I've enabled Mod_Security on my VPS which runs an Ubuntu OS with an apache web server. Now, I want to disable it because I setup another firewall to protect my server. I've tried preforming the steps ...
2
votes
1answer
80 views

NGINX load balancing not working as expected

I have an ubuntu system working as a load balancer and the /etc/nginx/sites-available/default looks like this: http { upstream myapp1 { server 192.168.0.20:80; } server { ...
1
vote
1answer
33 views

Redirect subdomain to folder in nginx version 1.1.19 on Ubuntu

I inherited a web server and I'm trying to set up a subdomain. We have other subdomains on the same server and they're working fine, but when I put the exact same info into the configuration file, it ...
1
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0answers
62 views

Unicorn restarts with same PID on USR2

Having recently migrated our Rails app to MRI 2.2.0 (which may or may not be related), we’re experiencing problems with our Unicorn zero-downtime restarts. When I send the USR2 signal to the master ...
1
vote
1answer
39 views

Redirect non-www to www over reverse proxy with Nginx

I'm having a bad day with Nginx. I'm using Nginx reverse proxy because I'm going to host multiple Node.js applications on the same VPS, but I cannot find a way to redirect a non-www domain to its ...
0
votes
1answer
76 views

Multiple DHCP uplinks - How to ignore DNS and default route on all but one?

A multi-homed box needs more than one uplink to be configured for DHCP. It needs to ignore default-route and DNS for all but one DHCP uplink. There is a similar question here [ Debian interfaces file ...
2
votes
1answer
320 views

Why don't random numbers in AWK change after the first run?

I'm studying AWK, and when I use the following command for the second time why are the numbers always the same? First time run: awk 'BEGIN{for(i=1;i<=10;i++) print int(101*rand())}' 24 29 85 15 ...
-2
votes
1answer
32 views

Upgrade old version ubuntu [closed]

I want to upgrade ubuntu 11.04 to 12.04 at least. Actually I want to upgrade to 14.04 since it is not possible I want at least 12.04 any one can help me so that I can upgrade it. It is AWS instance so ...
1
vote
1answer
227 views

How to make wget trust my self signed certificate (without using --no-check-certificate)? [duplicate]

Ubuntu 12.04 OpenSSL 1.0.1 14 Wget 1.13.4 My setup: create our own CA (our_own_ca.crt) generate a certificate which is signed with the above CA (graphite.local.crt) Concatenate that cert and the ...
0
votes
1answer
64 views

Compiling an individual kernel module (Debian/Ubuntu)

I need to modify the ELF loader's kernel implementation of an Ubuntu 14.04 distribution. Having downloaded the sources using: sudo apt-get source linux-image-$(uname -r) I ran the configuration ...
0
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1answer
35 views

hiding from who command and strange carcvncgiw process [duplicate]

my server have what i think is a suspicious activity, there is bash process that consume more than 30% cpu when i trace it with lsof -p it show: COMMAND PID USER FD TYPE DEVICE SIZE/OFF ...
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votes
1answer
31 views

How to connect ubuntu server via SSH if networking is down

I am facing weird in my new ubuntu server set up . Actually we bought new Ubuntu server which was working fine earlier and i can ping it as well as can access via SSH. Now after running following ...
1
vote
1answer
111 views

Setup public IP address on LXC container

Can anyone tell me how to setup a network interface for each LXC container so that each container can have its own dedicated IP address? Here's what the /etc/network/interfaces file on my host node ...
0
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1answer
33 views

Mounting file in Ubuntu over Samba to home folder

I am trying to share a folder over samba to a client location /mnt in Ubuntu. For mounting to /mnt I need to use sudo. I read in some articles online that mounting to one's home folder with Samba is a ...
0
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0answers
47 views

EC2 instance can't connect to RDS

I have created an EC2 instance and an RDS instance. Using Ubuntu and MySQL, RDS instance is public and not A-Z. I have created a security group that allows 3306 from anywhere on both Ingoing and ...
0
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0answers
81 views

Configure Selenium on Vagrant to use host browser

I am using a Vagrant box for local development. The guest OS is Ubuntu server. I now want to start running selenium tests in my dev environment, so I have Selenium Server running on the guest ...
0
votes
1answer
69 views

Is it better to store the MySQL database directory on a separate RAID 1 device?

We have a Linux server with a RAID 1 using two HDDs on which runs a Apache server managing multiple sites and some other services that interact intensively with the databases and produce massive ...
0
votes
1answer
124 views

I cannot connect to OpenSSH server running on Ubuntu server from Git bash running Windows, through Cyberoam firewall in network

Situation: I am trying to connect from OpenSSH client inbuilt with Git Bash running on Windows 7 professional x64 to OpenSSH server that runs on Ubuntu Server LTS 14 x64. Both of which are over the ...