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 to install Apparmor profile on Ubuntu 14.04 for sendmail?

I am running sendmail on ubuntu 14.04 together with OpenEmm. The man page of OpenEmm claims that I have to add some lines to the Apparmor profile if it is active. Unfortunately there is no sendmail ...
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2answers
58 views

Apache Suddenly Slow

Apache on my webserver is suddenly very slow. I have a 8 GB Ram, 4 CPU server at digitalocean with LAMP installed. What can I do to fix this? This is the top output: top - 10:37:15 up 93 days, ...
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1answer
61 views

Is it ok to run the `ntp` cronjob hourly?

I have several servers in Amazon EC2. Having noticed time difference on the instances I have installed ntp. I see /etc/cron.daily/ntp Cron job was added. Still I notice that, for some reason, the ...
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1answer
37 views

I could add an account to Citrix Receiver in Ubuntu but I can't start it

I just installed successfully Citrix Receiver in Ubuntu 14.04 64 bits by following these instructions https://help.ubuntu.com/community/CitrixICAClientHowTo. I added the same account which I am using ...
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2answers
23 views

Is it possible to use iptables on Ubuntu to limit brute force attacks?

Is it possible to use iptables on Ubuntu to limit brute force attacks for certain URLs? Basically I want to detect where user calls same url over and over again and drop his connection or somehow slow ...
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14 views

Use upstart to start a Python-script on boot

I have a server that I want to run a Python-script 24/7. The server is running Ubuntu 14.04. My upstart script looks like this: start on runlevel [2345] stop on runlevel [!2345] env ...
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2answers
91 views

Unable to install CURL on Docker Ubuntu image

I'm trying to install curl on ubuntu 14.04 in Docker image and the simple: sudo apt-get update sudo apt-get install curl will never work with the following output. It seems that curl installation is ...
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1answer
22 views

Which of these modules can I safely disable?

I'm having memory (RAM) issues in my Digital Ocean droplet, I have 3 sites with average of 300 unique visitors daily, with 2GB's of RAM and 2GB (in my opinion this should be enough) of swap... I ...
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1answer
754 views

How do I get NFS on Linux to export a folder to OS X with OS X's user IDs so I can cp -a from Linux to OS X?

I have Ubuntu GNOME 15.10 on one computer and OS X 10.11.2 on another. I want to migrate files from the Ubuntu installation to the OS X installation but preserving permissions. Currently the strategy ...
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1answer
181 views

how to share apache /var/www using samba server in ubuntu

Have similar issue like this question virtual centOS 6.2 - How to share /var/www using Samba I get error "Windows cannot access \server1\dev" You do not have permission to access \server1\dev I ...
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1answer
138 views

Creating a NFS share across servers with varying UIDs

I have 4-5 Ubuntu 14.04 servers in my network and I want to share a common /home directory between them. I have setup the nfs server, and I can mount the directory on various clients. However my ...
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1answer
21 views

How to config apache for a local network app?

Hey guys I'm really new to this please forgive me if I butcher all the terminology. I've managed to get a lamp-server running for my small business and have created a small webapp that runs on the ...
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1answer
51 views

How to scan multiple directories with clamav

I know how to scan one directory: clamscan -r /home but for the life of me I cannot seem to get multiple directories working and I cannot seem to Google this simple problem. I have tried: ...
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43 views

Encrypted LVM stops when mounting swap

I have configured a disk with LUKS this way (Ubuntu server 15.10): Boot partition Rest partition (LVM group) LVM data -> Encrypted (pass) -> ext4 /data LVM root -> Encrypted (pass) -> ext4 / LVM ...
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2answers
30 views

Bind allow zone transfer from NS IPs defined in zone files

I am Setting up a Bind Server and am migrating the zone files from a Windows Server 2003 that used to be the DNS Server in charge. (I'm running Bind 9.9.5 on Ubuntu 14.04 LTS) On the Windows Server ...
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2answers
178 views

Only one Apache virtualhost configuration comes into effect

I'm using Apache 2.4 on an installation of Ubuntu 14.04, and I'm in the process of configuring Apache "virtualhosts" in order to be able to serve different content for different hostnames. I'm trying ...
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0answers
66 views

Ubuntu 14.04 Software RAID 1 - md0 inactive

I have my root filesystem on /dev/sdc, and a software RAID 1 spanning /dev/sda and /dev/sdb (I think). I physically moved my computer and ran software updates today (either of these could be the ...
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1answer
50 views

Having troubles receiving emails from Gmail

I'm having problem with receiving emails from Gmail. The problem is gmail only. I can send mails to gmail and receive it perfectly in gmail. I also being able to receive mails from yahoo and other ...
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22 views

BackupPC not completing backups

I'm running BackupPC on Ubuntu server and it suddenly stopped working. I'm getting the following error: File /var/lib/backuppc/pc/mail.vpl.lan/LOG.122015 Contents of file ...
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1answer
30 views

One big server or multiple small? [duplicate]

I run an ad network with about 10 million visits per month. It is very likely that this rate will increase to 50 million in the next 6 months. What is the best way wo scale hardware? Currently I am ...
3
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0answers
15 views

Get floating ip from mmm to work on Tinc vpn on Ubuntu

I've got 3 ubuntu servers connected with a Tinc VPN right now. 2 servers are running mysql 5.6 db's, and the 3rd is used only as a monitor. We're using mmm to do the monitoring and assign a floating ...
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1answer
31 views

Unable to SSH into EC2 Ubuntu Instance port 22:Connection Refused [duplicate]

I created EC2 Ubuntu Instance, when the status check was clear, I tried following command. chmod -400 key.pem & ssh -i key.pem ubuntu@ip_address which gave following error ssh: connect to ...
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1answer
83 views

RTNETLINK answers: File exists when using netem with tc

So I simply get this error when I enter this command in my master VM: sudo tc qdisc add dev eth0 root netem delay 97ms RTNETLINK answers: File exists Any idea how that could be fixed? I am ...
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1answer
189 views

How to install nginx 1.9x with HTTP 2 support (1.95 or higher) on Ubuntu 15.10

I tried to install the latest nginx version (1.99) on my ubuntu 15.10. I want a nginx version >= 1.95 because I like to have http 2 support. I followed the instructions I found on the internet for ...
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2answers
106 views

Cannot figure out NGINX / Puma timeout 110: Connection timed out

Every so often, my rails server stops responding. I tail the logs and there is nothing—just a bunch of requests that have begun to start after the last one completed... Using Ubuntu Puma 2.15.3 ...
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1answer
29 views

Connect server A to database on server B and forward remote database port on server A

Edited: I'm quite new to all this admin stuff though! So: Whats the best way to connect a port on server A to the database on server B. The reason i want to do this: I want to connect server A to a ...
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3answers
357 views

Rsync hangs: expand file_list pointer array to N bytes, did move

Rsync is going into "interruptible sleep" mode after transferring some files from a local folder to a NFS folder. The folder I am trying to backup contains more than 180gb of data. This is what rsync ...
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2answers
54 views

Why did my apache2 crash? Althoought getting much more space and memory on my server

My website stopped loading on the browser, and worked back again just after I restarted the apache2. I use Amazon AWS ububuntu server moved from t2.micro to t2.large (vCPU: 2, CPU Credits / hour: ...
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1answer
59 views

Missing VM in old portal - To Reset SSH password for Linux Ubuntu in Azure

I built a Ubuntu server in Azure, stopped and started the server and the IP changed which may have caused the password to reset?! I cannot seem to login via SSH anymore as password seems to not work. ...
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24 views

iptables string match accept connection

With iptables I setup these rules: -A INPUT -s *my.ip.address*/24 -p tcp -m tcp --dport 80 -m string --string "/test.php" --algo kmp -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j DROP When I go to ...
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1answer
72 views

Package mysql-server-5.6 is not configured yet

I had an issue installing MySQL 5.6 on Ubuntu 15.10. Basically loading the db server failed for the mentioned reason. mysql-server depends on mysql-server-5.6; however: Package mysql-server-5.6 is ...
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1answer
40 views

Don't receive emails after restoring mails on postfix (ubuntu-server)

I recently swichted my virtual server and for that reason I had to move the whole postfix from the old to the new server. I created an archive (.tar.gz) for each domain in /var/qmail/mailnames/ For ...
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80 views

mysql won't start after upgrade to 5.6 - Permission denied

I'm running Ubuntu 14. Last week I was trying out some PDF tools locally and while trying to install pdftk it mentioned something about a dependency problem and needing to upgrade my 5.5 install to ...
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1answer
215 views

Unit polkitd.service is masked

After a failed Ubuntu version upgrade, a computer started behaving oddly. After initially failing to boot, we managed to make it get to the command line - but it refuses to network (so no apt, no ...
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26 views

Geoserver (a java based webapp) returns 404 for some clients after a bit of use. Rebooting the Ubuntu instance temporarily fixes it

Geoserver returns 404 for some clients after a bit of use. Rebooting the Ubuntu instance temporarily fixes it. It seems to happen to clients of mine on xfinity more than others. The service will ...
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1answer
17 views

Uninstall package from repair mode

I am running Ubuntu 14.04 LTS 64bit on my server. I installed resolvconf in an attempt to change resolv.conf without it being overwritten. It was all going well until I rebooted my VPS and it ...
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2answers
67 views

Unrecovered read errors on Linux RAID10 device

I have an HP DL380p Gen8 running Ubuntu 14.04 and apparently it's been having some trouble with its RAID10 filesystem for almost a month, despite everything seeming to be okay otherwise. I'm seeing a ...
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0answers
15 views

CouchDB Authentication and Security

i used this link to install CouchDB on virtual machine http://depth-first.com/articles/2010/01/28/pubcouch-install-couchdb-on-ubuntu-karmic-from-source/ everything goes fine, after that i tried to ...
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0answers
29 views

How secure is information on a LUKS encrypted backup media?

Imagine confidential information (certificates, keys, whatever) stored on an LUKS encrypted backup disk containing for example an ext4 file-system. AFAIK such a device contains a key file which is in ...
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19 views

Postfix sending limitation

I am a complete newbie in server-administration, but with this new work I am actually the system admin. So, first of all, I am kinda sorry for my poor property of language - but I am actually a web ...
3
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1answer
42 views

kvm snapshot-create-as failed

I have Ubuntu server with qemu/kvm. I'm try to create snapshot (for further backup) using libvirt and get this error: # virsh snapshot-create-as --domain 56 --name copy_snap --no-metadata --disk-only ...
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33 views

“Job failed to start” - Hey but why?

I'm running through an error that's giving me serious headache. Tried to Google for it but all I find is about MySQL which doesn't apply here. I've just updated Node and Ghost (blogging platform) on ...
3
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1answer
28 views

Nagios erratic behavior when sending notification emails

I am having a really tough time setting up nagios3 to do what I want. Far too many config files and not sure where exactly the problem is as everything seems correct. First, notifications were sent ...
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1answer
22 views

DHCPD configuration by interfaces

I have two interfaces on a machine running Ubuntu 14.04 LTS. Which has two different interfaces namely eth0 and eth1. I need to give IP addresses to the clients by the interfaces. For example, Any ...
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0answers
15 views

iptables match output rule for supplementary groups

The iptables utility allows for rules to match based on the process's uid or gid with the following: sudo iptables -A OUTPUT -m owner --uid-owner root -j ACCEPT I also want to add a rule to allow ...
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1answer
76 views

Can't send email to myself via gmail and postfix forwarding

I set up postfix to forward email to my gmail account. I can send email from this server to my gmail, I can receive outside email and it's forwarded correctly (even from other gmail accounts). ...
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18 views

X9SRL-F Crashing Ubuntu

We are running a KVM server node on Ubuntu 14.04.3 LTS with some VMs for a while now. About 3 months ago we noticed a random crash at night without any crashdata, the system seemed to be frozen back ...
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14 views

Virtual Machine Dig Connection timed no servers could be reached

I have been following this tutorial on how to set up a DNS and DCHP server but am running into some errors which my client. I am trying to set this up on a virtual machine. I am trying to test the ...
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34 views

HTTPS web filtering issue in endian

I am running endian firewall latest version and setup the web transparent proxy with enable the https filtering and installed the certificate in the client system. If i enable the https filtering then ...
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2answers
31 views

How can I list the current Apache 2 virtual hosts from the command line?

I want to to retrieve a list of the virtual hosts which are currently loaded and listening for requests i.e not just grepping the config files. It looks like apache2ctl -S does this but I am not 100% ...