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• Best way to replicate servers

  - by Matthew

  I currently have two servers both with linux software RAID1 configurations. They use heartbeat and DRBD to create a shared DRBD device that hosts a a exported NFS directory. The servers run Ubuntu Server with a LXDE GUI and some IP These servers are going to be placed on fishing vessels to act has redundant storage for IP cameras. My boss wants me to figure out the most efficient way to create these servers. We might be looking at pushing out several systems a week. Each configuration will be almost identical besides IP addressing. What would be the best method to automate the configuration process? We are trying to cut down on labor costs to set these up. Imaging and Proceeding are both on my mind right now

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• Configure Wireless Network Card

  - by Skizz

  I recently upgraded the wireless network card in my Ubuntu PC from an 802.11g to an 802.11n. Now, it can't see my router. It doesn't appear in the list of networks that is displayed when you click on the NetworkManager icon in Gnome. Other networks are listed and I have connected to them (no password required!). I'm using the Windows driver through ndiswrapper and it can see the card. I tested the card in a Windows PC and everything worked. The router's log doesn't show any messages coming from the wireless card. What have I done wrong? If you need any more information, just leave a comment and I'll get add it to the question.

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• Storage disk format to use to be utilised by all OS

  - by ClothSword

  Aiming to have a large internal HDD to store files, and several OSes on separate disks. They all need to read and write to one storage drive. Ubuntu (13.04+) Mac OSX (10.8+) Windows (7+) What format should the drive be? Would like to avoid buying third party software, here's what I have discerned so far: NTFS - Can't be written to by Mac without buying third party software? ext3 - Windows can't read, third party software in development. Mac has OSXFUSE HFS+ - Buy third party and/or faff around to get working on windows exFAT - Cross platform, but breaks MS patents?

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• Forwarding emails to nonexisting users/aliases to external mail server

  - by Niclas Lindqvist

  I'm in the works of installing a postfix mailserver on a machine currently being used as web server. As of right now, I've got it working as far as that I can send and receive emails using telnet through port 25. However, as my customer is concerned with downtime, I'd like to setup all the accounts one by one over time, and making sure it works, rather than just cutting the cord to the old mail server and start creating new accounts on the new system. How can I add the domain customer.com to my mail server and just add something like [email protected] to the users and aliases-lists without the web server trying to send all emails with the @customer.com domain to the new mail server? I'm running ubuntu, using postfix and postfix-mysql on the new machine, the old mail server is on a hosted environment somewhere else, where I don't have any control.

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• How to add exception for backup MX to tumgreyspf?

  - by Waleed Hamra

  I have an Ubuntu raring server running postfix/dovecot as an email server, with tumgreyspf doing greylisting and SPF checks. My problem is that I also have a backup MX server, that is supposed to store my emails temporarily, should my main server ever fails. It usually rejects receiving emails if it finds the main server online and functional. The problem is when it does need to do its job, tumgreyspf rejects all emails from the backup MX with an error like this: Jun 27 16:18:13 hamra postfix/smtpd[28732]: NOQUEUE: reject: RCPT from mxbackup.mydomain.com[x.x.x.x]: 550 5.7.1 <[email protected]>: Recipient address rejected: QUEUE_ID="" SPF Reports: 'SPF fail - not authorized'; from=<[email protected]> to=<[email protected]> proto=SMTP helo=<mxbackup.mydomain.com> any ideas?

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• Using pscp and getting permission denied

  - by Espen

  I'm using pscp to transfer files to a virtual ubuntu server using this command: pscp test.php user@server:/var/www/test.php and I get the error permission denied. If I try to transfer to the folder /home/user/ I have no problems. I guess this has to do with that the user I'm using doesn't have access to the folder /var/www/. When I use SSH I have to use sudo to get access to the /var/www/ path - and I do. Is it possible to specify that pscp should "sudo" transfers to the server so I can get access to the /var/www/ path and actually be able to transfer files to this folder?

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• PostgreSQL, Ubuntu, NetBeans IDE (Part 1)

  - by Geertjan

  While setting up PostgreSQL from scratch, with the aim to use it in NetBeans IDE, I found the following resources helpful: http://railskey.wordpress.com/2012/05/19/postgresql-installation-in-ubuntu-12-04/ http://ohdevon.wordpress.com/2011/09/17/postgresql-to-netbeans-1/ http://ohdevon.wordpress.com/2011/09/19/postgresql-to-netbeans-2/ For quite a while I had problems relating to  "/var/run/postgresql/.s.PGSQL.5432", which had something to do with "postmaster.pid", which I somehow solved via a link I can't find anymore, and which may not have been a problem to begin with. A key moment was this one, which was useful for setting the password of a new user I'd created: http://stackoverflow.com/questions/7695962/postgresql-password-authentication-failed-for-user-postgres This was useful for setting up a table in my database, which I did by pasting in the below into NetBeans after I made the connection there: http://use-the-index-luke.com/sql/example-schema/postgresql/where-clause Now I have a database set up with all permissions everywhere (which turned out to be the hard part) correct: The next step will be to create a NetBeans Platform application based on this database. I'm assuming it shouldn't be any different to what's described in the NetBeans Platform CRUD Tutorial.

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• Server memory issues, and expected level of service from hosting company

  - by Greg

  I'm involved in maintaining an Ubuntu VPS which runs our django websites (nginx/apache/mod_wsgi) and we've been having some memory spikes which have either caused the database to die, or induced kernel panic when the memory management system can't find any killable processes. I'm working on fixing the memory spikes, but I'm wondering whether there's anything I can do to better deal with the problem if it occurs again. Are there any tools I could use to detect the memory spikes and then, say, kill the offending process and email the server admin to fix it up? Killing off one website so that the server can remain operational is certainly preferable to the whole thing falling over. Also, we were charged $600 for after-hours service because we had to get the hosting company to restart the server - is this standard practice among hosting companies? Another provider I work with provides a panel with which I can stop and start the server myself, and given that a restart was all that was needed, $600 seems mightily excessive. (That's NZD, it's around $445 USD)

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• apt-get for a package with when "contrib/source/Sources" is not found correctly

  - by Stuart Woodward

  I tried to install Webmin on Ubuntu by following the instructions on http://www.webmin.com/deb.html. Using the Update Manager GUI I added the repositories and the key deb http://download.webmin.com/download/repository sarge contrib deb http://webmin.mirror.somersettechsolutions.co.uk/repository sarge contrib However when I do an: apt-get update apt-get install webmin I get the error: W: Failed to fetch http://download.webmin.com/download/repository/dists/sarge/Release Unable to find expected entry 'contrib/source/Sources' in Release file (Wrong sources.list entry or malformed file) W: Failed to fetch http://webmin.mirror.somersettechsolutions.co.uk/repository/dists/sarge/Release Unable to find expected entry 'contrib/source/Sources' in Release file (Wrong sources.list entry or malformed file) Looing at the page at the URL I can see: 7029066c27ac6f5ef18d660d5741979a 20 contrib/source/Sources.gz Is the error caused by the fact that the Sources are compressed with gzip or am I doing something wrong?

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• Why does the java -Xmx not working?

  - by Zenofo

  In my Ubuntu 11.10 VPS, Before I run the jar file: # free -m total used free shared buffers cached Mem: 256 5 250 0 0 0 -/+ buffers/cache: 5 250 Swap: 0 0 0 Run a jar file that limited to maximum of 32M memory: java -Xms8m -Xmx32m -jar ./my.jar Now the memory state as follows: # free -m total used free shared buffers cached Mem: 256 155 100 0 0 0 -/+ buffers/cache: 155 100 Swap: 0 0 0 This jar occupied 150M memory. And I can't run any other java command: # java -version Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. # java -Xmx8m -version Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I want to know why the -Xmx parameter does not take effect? How can I limit the jar file using the memory?

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• NFSv4 - ACLs not working

  - by alex

  I've setup an NFSv4 server (Debian) and client (Ubuntu/Mythbuntu). It seems that uid username mapping is working nicely out-of-the-box (I get correct usernames on ls -l if the usernames match between the two boxes, even if the uids don't), but ACLs are not working. I've installed nfs4-acl-tools and I can read the ACLs correctly on the client, but they don't get applied. What needs to be done for ACLs to work? To clarify; username mapping works for regular permissions. ACLs are applied using uid/gid (I can even set ACLs by uid and they work).

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• Cannot type backquote or backtick in xterm

  - by Cocoro Cara

  Ubuntu 10.10, XTerm(261), Keyboard layout = Canadian Somehow, the backquote (backtick = `) character can't be input does not get entered in XTerm. I type it and nothing happens. The cursor does not move forward. I know it works because I can input it in Terminal (gnome-terminal). The only strange thing is that I have to type the key twice for it to appear. Just to test it, I tried typing it in other applications, and the same thing happens. Have to type it twice in FF, gedit, etc. One more strange thing, I could not input it into this textbox in which I am typing this message. But I can input it in the URL bar, search bar, etc. Someone please help me solve this mystery. I like to use XTerm and I need the backquotes.

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• No HTTP Response from Tomcat 7 EC2 instance

  - by David Kaczynski

  I am new to EC2 (and Tomcat, for that matter), and I am trying to deploy a vanilla Tomcat 7 server to an Ubuntu 12.04.1 EC2 instance and access the default test site over HTTP. My EC2 instance is running, and the Security Group includes port 80: My /etc/tomcat7/server.xml config has been edited to listen for HTTP requests on port 80: 0 I have restarted my Tomcat 7 server via sudo service tomcat7 restart. However, according to sudo netstat -lnp, Tomcat is not listed as listening over port 80: I am unable to get any response from going to the ...amazonaws.com public DNS in a web browser. What am I missing?

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• Very High Network out in ec2 instance

  - by Jatin

  I launched an ubuntu-14.04-64bit instance in Amazon EC2 two days back. And I started Tomcat 7.0.54 in that instance and deployed my application war files. It has no other software installed other than tomcat and the default ones. In the past 2 days, its shows 858 GB of Data Transfer(Network Out) from that instance. I have attached a graph of Amazon CloudWatch Metric "Network Out" My application does not do any data download/upload. Its a Java Spring application and the front end is in HTML&Javascript. My application traffic was very low (less than 20 hits) in those 2 days. Is there a way to find out why these data transfers happened and also to find what data has been transferred. If you can see in graph, network out was 20gb per minute. Some more info: Network in was negligible CPU Utilization was very high Everything else was low

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• Reinstall linux over ssh.

  - by DoomStone

  Hello I'm having a large problem with our development server, it have had a program called Webmin + a total idiot have been administrating the Linux sever. Witch now have resulted in the server being totally trashed, there are so many different kinds of the same program install that anything doesn’t work. And don't get me started on the users and groups :D Well at last I have been given the responsibility to administrate our development server. But I would like to start from scratch, instead of trying to find every single package and config the previous admin have **ed up. But the problem is that it is a remote hosted server with ssh access. The server is running Debian, but i am thinking of reinstalling it with ubuntu server Thanks

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• Trouble configuring sendmail to relay mail

  - by Warren Schubert

  I am trying to configure sendmail and ufw on an ubuntu server (ServerA) so that another server (ServerB) can send mail through it. In my /etc/mail/access file I have the following line (a.b.c.d is the IP of ServerB): Connect:a.b.c.d RELAY My ufw status shows the following rule I added: 25/tcp ALLOW a.b.c.d When I telnet from ServerA I get through: telnet localhost 25 When I telnet from ServerB I don't (w.x.y.z is the IP of ServerA): telnet w.x.y.z 25 telnet: Unable to connect to remote host: Connection refused I did restart the sendmail daemon after editing the access file. What could I be missing? Something in sendmail.mc? Edit: netstat -an|grep -w 25 tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN

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• Attempting to caue packet loss with netem doesn't work - possibly because of NAT (but delay does work)

  - by tomdee

  I have traffic from a WIFI access point routed via an Ubuntu box. I have two network interfaces which are NATed *filter :INPUT ACCEPT [11:690] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [37:6224] -A FORWARD -s 192.168.2.0/24 -i eth1 -o eth0 -m conntrack --ctstate NEW -j ACCEPT -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Mar 15 13:37:21 2012 # Generated by iptables-save v1.4.10 on Thu Mar 15 13:37:21 2012 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -j MASQUERADE COMMIT If I run a ping app on an Android device connected to the WIFI network I can happily ping google. If I use netem to introduce some delay tc qdisc change dev eth0 root netem delay 100ms I can clearly see pings taking longer. If I use netem to introduce some packet loss tc qdisc change dev ifb0 root netem loss 50% then I see no change. Packet loss does work fine for locally generated traffic, just not for traffic coming in over the network that's being NATed. Any ideas how to sort this out?

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• Sendmail problem

  - by trobrock

  I am trying to get my server to be able to send email from PHP. Currently it is using send mail, but whenever I try to send mail to a gmail address I get this sort of response: --o54Mqd5s008981.1275691959/ServerName Content-Type: message/delivery-status Reporting-MTA: dns; ServerName Received-From-MTA: DNS; localhost Arrival-Date: Fri, 4 Jun 2010 22:52:38 GMT Final-Recipient: RFC822; [email protected] Action: failed Status: 5.7.1 Remote-MTA: DNS; gmail-smtp-in.l.google.com Diagnostic-Code: SMTP; 550-5.7.1 [xxx.xxx.xxx.xxx] The IP you're using to send mail is not authorized Last-Attempt-Date: Fri, 4 Jun 2010 22:52:39 GMT How can I set this up to relay through a google account that I own? Is sendmail the best thing to use, or should I switch to Postfix or something? This is on an Ubuntu Server 9.10

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• How to open Firefox's "organize bookmarks" from Vimperator?

  - by Igor Popov

  Before using Vimperator, I used Xmarks for organizing and synchronizing bookmarks between computers. Now I installed Vimperator and I can only bookmark a page from command mode with :bmark. How can I open Organize Bookmarks with Vimperator? Besides disabling Vimperator and choosing it from the menu what else can I do? Before, I had CTRL + SHIFT + b to open the organizer. Now, in Vimperator, this shortcut doesn't work anymore, even after temporarily disabling Vimperator with CTRL + z. EDIT After setting the main menu visible (with :set go+=m thanks to Hamish Downer), I saw the shortcut for opening the organize bookmarks dialog (CTRL + SHIFT + o). I recently switched to Ubuntu Linux and in this version of Firefox some keyboard shortcuts are different then in Windows (including the shortcut for opening organize bookmarks). Sorry for my ignorance.

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• GParted tells me my partition has 1.30 GiB used space but I cannot access its contents

  - by reprogrammer

  I've a ext4 partition (/dev/sda7) for my Linux. And, another (/dev/sda5) for keeping my data. When I installing Ubuntu 10.04 LTS, I set the mount point of /dev/sda5 to "/" and that of /dev/sda5 to "/data". GParted tells me that 1.30 GiB out of 70.12 GiB of /dev/sda5 has been used up. But, the mounted directory "/data" is empty. So, it looks like that my data is there but I cannot access it. Besides, when I set the mount point, I didn't check the "format" box. So, it shouldn't have been formatted. How can I check whether the partition has been formatted? How can I recover my files?

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• httpd (no pid file) not running while restarting apache

  - by user59503

  Hi I am working on ubuntu. I got the error messages while try to restart apache. root@XXX:/etc/init.d# sudo /etc/init.d/apache2 restart * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName httpd (no pid file) not running apache2: Could not reliably determine the server's fully qualified domain name, using xxx.xxx.xx.xxx for ServerName (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs I got the following message when tried netstat -pant tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 0 32748 9950/httpd tcp 429 0 xxx.xxx.xx.xxx:80 xxx.xxx.xx.xxx:xxxxx CLOSE_WAIT 0 0

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• Gnome Terminal intercepts ctrl-F1

  - by frank

  Gnome Terminal does not pass on to applications the keypress ctrl-F1. It's an official bug: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/932940 The bug is marked Feb. 2012 but lives on in serendipity since 2009. The bug report is not even complete since shift-ctrl-F1 is also affected. However, I noticed that those two keys are the default keys for switch-to-workspace-1 and move-to-workspace-1. So I disabled them. Zero, zippo, zilch: Gnome Terminal would still swallow the keys. Next, I assigned to those two workspace functions totally different keys. The new keybindings did work, Gnome Terminal would still swallow ctrl-F1 and shift-ctrl-F1. Where are the default workspace keybindings stored? [Not in a xml-file.]

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• API server not function ["The connection has been reset"]

  - by Miguel Beltrán

  I'm having some troubles with one of my servers. I've done an application with two servers, one the frontend that grabs the data of server API (Ubuntu server). Well, yesterday had a lot of visits and the API server stop functioning but: -I can do stuff in MySQL by SSH. -The memory usage is ok. -The logs are ok. -The bandwitch usage is ok. -If i restart the server or Apache2, function by some time (3-4 minutes). And the most important i think if i tries to access to API (Is rest-style with http) it puts me the Firefox error "The connection has been reset". I'd tried: -Restart the server -Restart Apache2 -Restart MySQL -Viewed the logs of Apache2/MySQL I don't know too much about systems so i don't know what to do more.

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• /data/tmp on database server?

  - by Mellon

  I am on a Linux ubuntu machine with MySQL installed. My teacher gave out an assignment which mentioned "copy cars.dat to /data/tmp on the MySQL database server" without any explanations, I do not know what is the "/data/tmp on database server" means exactly? Basically after that I need to execute SQL statement like LOAD DATA INFILE '/data/tmp/cars.dat' INTO TABLE cars So, what does copy cars.dat to /data/tmp on the database server means as there is no /data/tmp directory even? Personally, I checked /etc/mysql/my.cnf file, inside which there are definitions of : ... basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp ... Does it mean to copy cars.dat to the tmpdir which is just /tmp under root directory??

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• Google Chrome can't load too many tabs together!

  - by tapan

  This is an annoying problem that I face and friends of mine agree to this too. When using a site like Digg I tend to browse the page and open a lot of tabs simultaneously before reading each tab individually. Now what happens is, when there are 4-5 or more tabs loading up, all of them just stop loading.I can still see that annoying circle rotating (which means it is trying to load) but nothing happens. I have to stop the load and then refresh one tab at a time to see these pages. I never faced these problems on firefox or opera. What can the possible reasons for this be and how do I overcome this issue ? I'm using Ubuntu 10.04 and my Chrome Version is 5.0.375.55. PS: I use the internet from behind a proxy server at my college. I wonder if that could cause these problems. My friends in college also face the same problem.

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