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• recommendations for a lightweight linux distribution for a test server

  - by Jack

  I'm planning on setting up a test server to experiment with some application servers (tomcat/jboss/...) and with some portals. Now the machine I've set aside for this is lightweight CPU/GPU wise(Atom D510, 4 gigabyte ram, 500 GiB hdd, onboard GPU). But it should suffice for most things, I'm more interested in the stability of JBoss/Tomcat for my purposes than the stability. However I'm having a bit of trouble picking an appropriate distribution size/performance/setup time wise/security wise since it seems I can't sneeze without another distribution popping up. I've been thinking about going for Fedora since I've read that that distribution has been optimized for Atom, but I'm not really familiar with it. My experience with Linux has mostly been limited to Ubuntu and some tinkering with puppylinux. I'm not afraid to get my hands dirty using the command line. I'm not planning on starting a discussion per se, mostly the pros/cons that people have encountered with some distributions

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• Recurring network issues the same time every day.

  - by Peter Turner

  Something has been happening on my company's network at 9:30 every day. I'm not the sysadmin but he's not a ServerFault guy so I'm not privy to every aspect of the network but I can ask questions if follow up is needed. The symptoms are the following : Sluggish network and download speed (I don't notice it, but others do) 3Com phones start ringing without having people on the other end. We've got the following ports exposed to the public for a web server, a few other ports for communicating with our clients for tech support and a VPN. We've got a Cisco ASA blocking everything else. We've got a smallish network (less than 50 computers/vms on at any time). An Active Directory server and a few VM servers. We host our own mail server too. I'm thinking the problem is internal, but what's a good way to figure out where it's coming from?

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• How to generate new CSRs for TLS use in sendmail?

  - by Mikey B

  SendMail 8.13.8 | CentOS 5.x Hi Guys, I'm using ca-signed TLS certificates on my sendmail server and they are up for renewal soon. Our new CA doesn't like our old CSR so I need to generate a new CSR. Can someone point me to the procedure for doing this (without affecting the production certs that are already in use)? I'm paranoid of overwriting the old TLS certs in the process of generating a CSR. Most of the instructions I've found are for implementing self-signed TLS certs -- which isn't an option for me at this time. I'm thinking it would something like: openssl req -new -nodes -out new-tls.csr -keyout new-tls-private.key But I wasn't sure if I was missing some options there such as the -x509 option... -M

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• Why does my laptop shut down, does it get too hot?

  - by Kevin P.

  When I play games, or use powerful-applications such as Autodesk Maya, my laptop just shuts down, ofcourse without any warning at all. This is what I've tried so far: Cleaned my fan, completely! Checked if I have enough RAM and good enough graphics card, and I do. (6 GB RAM, Nvidia GeForce GT540M with 2 GB VRAM) None of these options worked. Even tried to clean my fan twice! Now, I have some options I could also try, but I don't know if that have anything to do with it or not. I was thinking reinstalling my Windows 7, because maybe it has to do something wrong with the installation? My laptop is about a year old, and this problem just happend out of no where, short after I downgraded from Windows 8 Release Preview to my original Windows 7.

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• Can a working Tomcat 6 webapp be turned into a usable .war file?

  - by Bill Cole

  Problem: I have a working webapp on a FreeBSD 8.1 Tomcat 6 test server that I need to move to a production system. The developer who last touched it (and had root on that server) has moved on and isn't helpful. The running app seems to have been deployed from a CVS server that is now unavailable. My thinking is that I would like to find a way to wrap the working webapp into a proper .war so that I can deploy it on a pristine host and (after testing) send the existing system to a very deep bitbucket. But I'm not having luck finding a way to do that. I'm a sysadmin not a developer and don't work much with Tomcat systems so I may be (likely am) overlooking something blindingly simple. I gather that I may be able to just tar up the deployed directory and untar it on the new machine, but I have a nagging feeling that there are pitfalls in that.

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• Examples of applications where messages are pushed from a server and display on clients immediately

  - by James Hay

  I'm trying to find an example to show where data is sent from a server and is pushed to a/multiple clients which are updated immediately, i.e. the client doesn't make requests for updates. It doesn't matter whether we're talking mobile, desktop or whatever. An even better example would be where there were multiple recipients for the same message. It doesn't matter what the data is or the context it's used in, only the immediacy of receiving it. I was thinking that there might be some example in finance and the stock markets, but I haven't been able to find any through googling. IM clients are a great example of this and are on my list of one ;) If anyone works on applications of this nature or knows of particular implementations, can you give me a quick run down of the use case and if it's commercial software the name of the software. This is all basically for research purposes so doesn't have to be particularly detailed. If anyone can help, thanks.

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• linux intrusion detection software

  - by Sam Hammamy

  I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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• NIS AD password synch for new accounts

  - by user135004

  I have a Win2k3R2 DC with NIS. All is working well but its no longer synching the passwords for new accounts. When creating a new AD user, NIS does its thing and sends its Unix account to the synched linux server. It's doing everything its supposed to do but not the users password to the server (getent passwd returns the ABCD!efgh12345$67890 password for the new account). Thinking that password synchronization is not working, I changed the password of an existing working account and it synchs the new password. If I delete a new or old AD user, it deletes it on the linked linux server as well. All this tells me that NIS is doing its thing (at least with existing accounts) No updates have been installed on the DC. I am not even sure where to start here.

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• Dual Touchscreens in Different Rooms

  - by Ash

  I'm planning on having one dual-core system running two touchscreens, each in its own room in the house. I'd like to be able to use the internet on one, while someone else uses the other to record music - each of us interacting with the screen as we would separate computers. I was also thinking that running each screen, or certain programs, on its own core might make this work more smoothly. Will this setup work in Windows 7 Home on a mini-tower or do I need to invest in a server to get this sort of workstation/terminal setup to work?

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• Excel SUM From Different Sheets IF Date Found

  - by user329005

  I have a workbook with separate sheets for each product (about 20 sheets, adding more on a regular basis). Each product is only available for a certain time frame, and has daily sales data recorded on that product's sheet. I want an overall snapshot across all products from any given date to be consolidated on a new sheet. This would sum from a particular column on each of the other sheets if a corresponding date exists. I have a moderately passable function right now that has a separate VLOOKUP for each product sheet like SUM(IF(ISERROR(VLOOKUP(DATECELL,SHEETNAME!ARRAY,COLUMN... next VLOOKUP, next VLOOKUP etc., but it's incredibly cumbersome to update each function when a new product is added. I'm thinking there's a much easier way utilizing a named group (sheet names), SUMIF, VLOOKUP etc. Then when a new product sheet is added, I can simply add the sheet name to the named group rather than editing all the functions. Any help would be much appreciated!

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• Can I mix CAT5 and CAT6?

  - by Jason94

  I'm thinking of upgrading the "backbone" of my network, taking a CAT6 cable from my router (DLINK DIR-655 (has cat6 ports)) to a gigabit swith in the tv rom (25m). I have two devices there that uses network (xbox and tvbox, both of them have cat5). Will my net be downgraded to 100mbit as max speed, or will I get 1 gigabit between my router and switch, and 100mbit between tvbox and xbox? From back in the days i have a tool to create my cat5 cable (the plug tool thingy), can I use this for my cat6 too?

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• Virtualization Solution for Family Use

  - by Dave Potts

  I'm trying to put together a solution for my family (wife + three kids). At the moment I have one newish desktop and a couple of aging laptops. There are always arguments over who should have the fast desktop. I'm thinking I would like to invest in a new powerful server and then run virtual desktops for each user off the server so that each user would have the same experience regardless of which actual PC they were using. I would like to use just a Linux based desktop, but unfortunately I need to support some Windows games for the kids. I've not tried wine for the games but would be willing to give it a try. Any advice on what the setup should be would be most appreciated.

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• What's the typical latency for key strokes using an ssh connection on a local wifi network?

  - by dan

  I develop software on a Macbook Air 1.6 Ghz but find running Rails test suites and generators on this computer very slow. I'm thinking about buying a Linux tower to put on my local wireless network to do my Rails development on. I would want to use my Macbook Air and ssh into the Linux box and do my development with Gnu Screen, vim, etc. Can I expect the keystroke and echo latency for a ssh session between two machines on a local wireless network to be negligible? Does anyone develop using this kind of local setup?

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• Does Windows notice when a VM is moved around?

  - by Martin

  I'm thinking of migrating a Desktop machine (Windows XP) to a VM solution (VirtualBox or MS Virtual PC). The reason is that I need a new hardware anyways and I don't want to (cannot properly) reinstall all the "business" apps on there. So my plan goes as follows: I'll pull an image of the machine and restore it to a Virtual Machine using Acronis Universal Restore or some other tool that can restore to dissimilar hardware. (The process is largely irrelevant for this question I think.) Once I have this virtual machine properly running I'll move it to a new PC. So the question now is. Are there any caveats wrt. to Windows (XP?) being installed in a VM and the VM machine being moved around on different host computers? Can anything break in the OS inside the VM? Will there be troubles wrt. to Windows activation?

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• Remote access to a KVM Ubuntu virtual server

  - by Lee

  I've just setup an ubuntu virtual server and everything seems to be working fine. I used KVM to get it working with a bridged network. I've given the virtual server a static ip address on my network. I don't seem to be able to connect to the virtual machine though from outside my network. If I'm on my own network it all works fine, I can ping the ip and connect to it. The virtual server can ping other machines and sites on the internet. I changed the port forwarding rules on my router to forward any connections on a specific port to the virtual server ip address thinking that was the problem, but it was still the same. Is there something I'm missing here which is blocking outside connections to the virtual machine? Thanks.

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• Windows XP Activation Issues

  - by David

  Related to my older question: Get xp product key from boot Thanks for the help on that one. So, in the end, i couldn't get into my harddrive because i didn't have the available hardware to hook it up to another computer to get the old activation key. So, instead, i entered another activation key (i know, naughty) in hopes that there would be a way to retrieve the old one, restore point or something afterwords. What legal ways can I get xp re-activated after a repair when I don't have any record of my activation key? for those who think im just trying to crack it, your wrong: Got a virus, which stopped me from getting into windows Got AVG Anti Virus, which stopped me from getting into safe mode Got a 2 year old, who decided to rip-off and chew my activation sticker on my computer (nice one). Repaired windows installation thinking i wouldn't be asked to re-enter the activation key, to find that i was.

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• HAProxy being killed with more that 54,000 connections

  - by Olly

  I am trying to run HAProxy (1.4.8) on a EC2 machine running Ubuntu 10.04. I need HAProxy to be able to handle many thousands of long-running persistent connections (websockets). With the current setup HAProxy gets killed at around 54,300 connections (roughly). If I am running HAProxy in the foreground, the only output is "Killed". Am I right in thinking this is the Kernel killing the process? Is this because it is out of resources? Can I increase the resources? The CPU and memory consumption are low with 50,000 connections, so I don't suspect either of these. How can I prevent this from happening?

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• How do you access usermin

  - by Lobe

  I have recently setup a web server with webmin, virtualmin and usermin on CentOS to host some websites and email, however I am unable to access usermin. I can access webmin from www.foobar.com:10000 but I can't access usermin from www.foobar.com:20000 This thread seems to have dealt within the same issue, however when I tried the command "telnet localhost 20000" it came back with a connection refused message. Any idea how to get this running. I'll let you know in advance that I am a linux newbie and this is a large learning experience, so don't rule out anything if you are thinking "oh, but he wouldn't be dumb enough to forget that" or the like

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• Open file in local text editor from within an SSH connection

  - by Sam

  I'm not a vim guy. I'd like to be able to open log files in Sublime Text when in an SSH connection from within Terminal. Is there a way I could do this? I'm thinking there must be a command or something that could copy the file over to a temporary directory in OS X and then open it in Sublime Text, and when I save it, it'll copy back to the original location through SSH; similar to how FileZilla does it. I'm on Mac OS X MT. The server I SSH into is running Ubuntu. I'm using Terminal.

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• How to disable auto-assume in Google Chrome

  - by Ieyasu Sawada

  I've noticed that whenever I sign in in Google Chrome version 21.0 it automatically assumes and it automatically knows what I want to search. I basically use the address bar to search(my default search engine is Google) I don't go type Google.com on the address bar and then search from there. So what happens is that when I type something for example "vernier" for vernier caliper I'm automatically redirected to my facebook account which has a user account name of vern.ancheta. It's really getting annoying, this happens for every search term that I used maybe even ones that I haven't used before in my entire search history in Google. It always assumes as if it knows what I'm really thinking. What's the solution for this? Is this a bug in Google Chrome or just one of its annoying features. Please enlighten me on this.

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• iptables - drop all HTTP(S) traffic but from CloudFlare

  - by Martin

  I would like to allow only HTTP(S) traffic coming from CloudFlare. In that way attackers cannot attack the server directly. I know CloudFlare is not mainly a DDoS mitigator, but I would like to try it either way. I'm currently only having access to iptables (ipv4 only), but will try to install ip6tables soon. I just need to have this fixed soon. (we're getting (D)DoSed atm.) I was thinking about something like this: iptables -I INPUT -s <CloudFlare IP> --dport 80 -j ACCEPT iptables -I INPUT -s <CloudFlare IP> --dport 443 -j ACCEPT iptables -I INPUT -p tcp --dport 80 -j DROP iptables -I INPUT -p tcp --dport 443 -j DROP I know that CloudFlare has multiple IPs, but just for an example. Would this be the right way?

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• Browser which shows what's been downloaded so far regardless of formatting and layout ?

  - by Mick

  Every now and then a website becomes super-slow (but not broken) because there are too many people looking at it at the same time. When I try and view such a site, say with Firefox, I can see that it is downloading all sorts of components of the site because of the progress information printed at the bottom of the window and I'm sitting there thinking "If only the browser would show me what it's got so far. I don't care if its a jumbled mess, I just want to see what you've got". Does any browser offer such an option?

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• Control scheduled tasks execution

  - by SJuan76

  We are a small shop. I am mainly a programmer, but due to being the only one that risks to manage our servers, the task has fallen on me (yet I it is still a secondary function so I cannot give it too much time). Over the course of years we have needed to create a decent number of .bat scripts that run as scheduled tasks in our servers (dump DB servers, SVN servers, copy files, etc.). Manually checking that everyone has proceeded ok is a time consuming task. I could get them to send an email on completion, but then I would get swarmed by lots of emails each morning. If I setup them to only e-mail on failure, I might miss the instances where the error causes the task to abort (or even not to start). Are there other alternatives? We are currently using Windows 2003 R2, but we are thinking of adding some Linux server soon, so a cross-platform solution would be best.

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• HD 6970 Corrupted Video

  - by FailedDev

  considering this rig : i7 2600K 8GB RAM Corsair Vengeance kit 10-9-10-27 @1866 HD 4870 PSU Corsair AX 1200 I recently upgraded to a HD 6970 and I am getting the following - not so nice screens : http://imageshack.us/g/213/1000142z.jpg/ Had anyone any similar trouble at all? I am thinking that the card is DOA but could it also be the Mobo? Since I am in the BIOS I can't think how the mobo could be the problem. HD 4870 works perfect btw regardless of what I throw at it. Any way to prove that the card is OK? Thanks

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• Wireless controllers vs wireless usb hub

  - by David Jensen

  For my htpc i currently only have a steerin wheel as a controller. This is wired and it looks really bad having extended usb wires from the tv to the table. However im thinking of bying some new Gamepads and now comes the question. Should i buy wireless ones or wired and connect them to a wireless usb hub? Having a wireless hub would let me manage my gamepads easily from the couch. A wireless hub also allows me to connect other things that are not input devices from the couch. However im wondering if wireless usb hubs may not be made for input devices in the way that they may not have 100% uptime and probably some delay. Am i right about this?

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