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• Munin "Available entropy" when using adress space layout randomization

  - by clawspoon

  Having just configured munin for statistics logging on my gentoo server (hardened profile), I am noticing that my "Available entropy" is consitently in the 200-300 range. This seems way to low, so I checked it manually using the command $ cat /proc/sys/kernel/random/entropy_avail 3544 Odd. Consistently very low values in Munin and practically filled up when checking manually. After thinking about the problem for a while I came to the conclusion that the problem is probably that I'm using Adress Space Layout Randomization which is using the entropy when running commands/programs. Since Munin runs a whole slew of programs all the entropy is used up, and Munin then measures how much entropy there is, resulting in the low values. Does anyone have any experience with this? How can this be avoided?

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• Hyper-V and host-installed hardware devices: can guest VMs access?

  - by gravyface

  Have a couple of servers I'd like to setup as Hyper-V Servers, with a couple of Windows 2008 Standard VMs. On the host, we have a few hardware devices we'd like to be accessible to the guest; I'm not sure if these are supported via a raw "pass-thru" on Hyper-V (which I don't have a lot of experience with) if the same drivers are installed on the guest. Hardware in question is a Brooktrout fax card, a SCSI adapter for the tape drive, and a 9-pin serial connected to one of the core firewalls for management.

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• glassfish v3 and java EE in production mode: what are the options to update a live web app?

  - by shadesco

  I am building a web app using java EE and glassfish v3. I want to move it to production mode soon, however i have zero experience with using glassfish in production, i would appreciate if you give me some guidance about how to approach the following scenario: say i have deployed the web app using admin console pointing to the .war file. But what if i want to update this live application, do i need to : a) undeploy -- build new war file (with updates) -- paste the war file to the app folder --redeploy? b) move in only the changed files , ie : .class files , jsp, etc... without undeploying before?

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• Gmail - Ways to have more than 20 items per page in the search results

  - by Andrei

  Gmail has the notorious limitation of 20 results per page when searching your mail. Is there an extension (Chrome - preferable, Firefox, etc.) that can fix this (i.e. allow more than 20 items per page)? Based on my experience this should be entirely doable (have the extension move across pages in the background and then collect the results). Is there an extension that can already do this? I'm asking because I couldn't find one.

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• Opening a Corrupted winmail.dat file

  - by tearman

  I have a set of winmail.dat files that apparently have evolved from a set of emails with corrupted headers. It looks like Exchange 2010 changed the headers around sometime last September and basically rendered exported .eml files unable to open. Now the HTML/PlainText emails seem to do ok, but the files that use RichText (specifically Microsoft's TNEF format) will not open in any program, Microsoft or not. I've attempted to use many different non-Microsoft converters and they see it as a corrupted message as well. If I remove the headers of the email, rename it as a winmail.dat file, some emails will open in Word, but most won't. If you take a look at the email in a text editor, there are null characters EVERYWHERE that distort the email itself. Anybody have any experience with this and/or suggestions on how to at least open it?

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• DosBox Booting From HDD Image, FreeDOS Image created with qemu-img.

  - by TechZilla

  I'm having trouble booting a HDD image with DosBox. I've only gotten either read errors, or boot failures. The HDD image is a verified working FreeDOS installation, created with qemu-img. The image has been formatted FAT32, and it's working as expected with QEMU. The Image is only 1G in size, and is a flat raw image. I have been able to mount it with Linux, for ease of file transfer. I even was able to boot with DOSEMU, After I mounted the image under Linux. I would love to somehow just boot from the raw image file, but I would have no problem booting from a mount. I just can't get anything to happen, and I have read the Documents over. I have verified DosBox is working as expected, with its included DOSlike environment. I would appreciate any help, as I just don't have much of DosBox experience.

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• Windows: Should I install Server or stick with regular?

  - by stalker92

  I hope somebody can help me solve my dilemma. I have my home PC (using Windows 7) which I use for both work and leisure (gaming, surfing, movies etc.) I tend to never turn it off, only when I must reboot because some installation requires me to or when the power gets lost. But, sometimes Windows starts acting weird (usually after the long period of system uptime), per example eats up randomly all the space on my system partition etc. which is solved after the reset by itself. I was thinking to switch to Windows Server, I guess that it is more optimized for long uptime, well, obviously it is meant for use on servers. Can somebody with more experience with this help me decide is it worth it, will it solve these issues connected with long uptime periods? Thanks in advance.

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• Move /var directories to to /mnt on an EC2 instance

  - by Geoff Lanotte

  I am trying to work on a standard configuration for a set of EC2 instances running ubuntu 12.04. These servers are going to be primarily web servers for a Ruby on Rails application. When you configure a new large instance, you are given a primary of 8GB and then ephemeral storage of 400 GB that is mounted to /mnt. It seems logical to me to move some directories that have a potential for growth off to the /mnt directory, I was specifically thinking of /var/www and /var/log. My question is two-fold: Is this a good idea or are there pitfalls that I cannot see? If this is a good idea, how should I go about configuring this. I do have the ability to configure new instances and down our old instances. My concern is over long term, doing this in such a way that it prevents downtime. I am a developer with some experience in devops, but mounting drives is something I have not faced before, so explicit directions would be greatly appreciated.

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• Preferred method for allowing unprivileged UNIX/Linux users to view syslog information

  - by Joshua Hoblitt

  I have some non-privileged "role accounts" that need the ability to view [some of] the local syslogs (eg. /var/log/messages) for debugging purposes. This is explicitly local log data, not remote syslog, logstash, etc. Obviously, there's several ways to address this issue. What I'd like to know is if there is a fairly "standardized" way to solve this issue. Typically, I solve this problem with sudo but either POSIX groups or acls is attractive as it's few chars for the users to type and it removes entries from the sudo log. However, I don't believe I've ever seen that done before. What is your experience? How do large install base sites address this?

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• How to use radiusclient-ng?

  - by Muhammad Gelbana

  A guy on my team compiled the radiusclient and radlogin executable found on that page. But installing it is getting more and more problematic and I can't seem to get anywhere ! I received from him: radclient libfreeradius-client.so.2 servers radiusclient.conf dictionary.dat radlogin What I'm trying to do is to install this client on a linux box and the: Access that box remotely using ssh. Then issue a authentication\accounting requests to another remote RADIUS server. But nothing seems intuitive about this and I have very little experience with linux and RADIUS protocols ! Has anyone successfully installed that client ? Thank you.

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• Can a RAID 4 disk setup crash if only 1 hard disk fails?

  - by Steve Rodrigue

  I am a web developer. I have not much experience in hardware. For this reason, I use managed servers. This morning, one of the drives in our setup failed. However, the full site went down. I asked my web host what happened and he replied that the hard disk failed in such a way that the RAID controller couldn't work properly. The array was set up as RAID 4. Do you guys ever seen that before? Is it possible? Thanks for any help on this guys. I need to know if my web host is honest with me.

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• SonicWALL NetExtender - Client Install?

  - by JArmani

  We are about to push out a new VPN solution for our organization. One of the beautiful things we saw in SonicWALL's SSL-VPN was the thin, browser-based solution of NetExtender. Does anybody have experience with this? My specific concern is that, at least in Windows 7 during testing, it prompts for admin credentials to install the ActiveX NetExtender plugin, which is standard for installing anything in a Windows domain environment. But doesn't this mean I actually have to go in and install the client on all domain laptops that will be using the VPN in the field? They wouldn't actually be able to simply visit the site and run the client, as advertised? By the way, we're using the SonicWALL NSA 3500 device. We do have ManageEngine's Desktop Central, which can push out software installations, but it usually has to be in the form of a .MSI package. Is there any solution to this, besides hitting up all my organization's computers?

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• Would upgrading memory from 4GB to 8GB on my laptop solve swapping issues?

  - by Tom

  I have a laptop with 4GB of memory with Windows 7 on it and I often experience with Eclipse that it is swapped out to disk. On the net they usually write 4GB of RAM is more than enough for average use and aside from Eclipse+Android Emulator I don't really use other extra apps, yet Eclipse is always swapped out if I haven't used it for a while (say, 1 day) and it is annoying it to wait for it to be resurrected from swap. My question is: would an upgrade to 8GB solve the issue of swapped out applications? With 8GB would windows 7 keep everything in memory? Or it wouldn't change anything and Eclipse would be swapped out regardless of the amount of memory, because Win 7 has a habit of kicking out every application from memory which hasn't be used for a while?

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• How to make sure you server NIC performance is at best on Windows?

  - by Bobb

  I realised that I followed some obscure paper on setting NICs on Windows for too long. It might be outdated with new hardware released in past couple of years and with W2008R2. I read a bit about offloading and RSS settings on Windows and I realiased that it is very much circumstantial. Noone can really say - enable that and disable this. etc. So what I really want is for my next server try and setup testing environment and measure how my particular application will behave with different settings. The target is going to be latency of TCP primarily. Please note I am talking about latency inside the box. Are there precision tools for Windows to measure latency (down to microseconds)? P.S. I know this is not easy question. Windows time drift is awful problem for any precision test but still I am sure I am not the fist person to need that... Please share your experience

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• How do I make the PC Zune download a movie, not stream it?

  - by bharal

  As the title suggests - I have bought a TV show series season on PC Zune. My girlfriend watched the show, and now I'd like to be able to watch the show too. The catch - I'm going to go overseas on a trip soon, and I'd like to be able to watch the show from outside the US. Given that Zune won't let me stream things overseas (past experience, anyway), I would like to download the show to my computer and watch it that way. The problem is that although the full season has been "watched" it appears it was only streamed, not downloaded. Or rather, that one episode was downloaded, and the rest streamed. I bought a season pass (so all the episodes at once) and the show was bought, not rented. How do I make Zune download, not stream, a show?

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• How do you configure recycle bins on roaming profiles?

  - by Zombian

  I copied the following from a post on the Spiceworks forum which remained unanswered: Is there any way to place the Recycle Bin back on the desktop of a Roaming Profile with the Desktop being redirected? I have used Google and can't find a straight forward answer. I am asking for people with experience in this. This is for a Windows XP machine. I saw mention of needing to use a program such as Undelete but I'm hoping that is not the case. Further explanation: I use redirected folders and whenever a user deletes something from their desktop,my documents it doesn't show up in the recycle bin. It doesn't appear in the recycle bin on the server either. Where is this data? I doubt it is permanently deleted. Is there a way to change the recycle bin on the users' desktop to display those files? Thank you!

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• Tar and gzip together, but the other way round?

  - by Boldewyn

  Gzipping a tar file as whole is drop dead easy and even implemented as option inside tar. So far, so good. However, from an archiver's point of view, it would be better to tar the gzipped single files. (The rationale behind it is, that data loss is minified, if there is a single corrupt gzipped file, than if your whole tarball is corrupted due to gzip or copy errors.) Has anyone experience with this? Are there drawbacks? Are there more solid/tested solutions for this than find folder -exec gzip '{}' \; tar cf folder.tar folder

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• Whats the best way to deal with backups for my php/mysql application

  - by spirytus

  I'm creating php application for my client and now thinking what would be the best way to do backups, automatically if possible? I don't have much experience in this area and in case something goes wrong, or if I need to migrate, I would like to have fast way of getting it all back online. I understand "something goes wrong" is a very wide term, but lets say that someone hacks my site and wipes out database and all the files. My app. is written in php/mysql and I got access to cpanel (hosted with justhost.com if that makes any difference :). I used Joomla and it has JoomlaPack that does complete backup almost automatically and in case site fails, its easy to revert, or migrate if necessary. Is there anything like that for my configuration that would make reverting/migration, easy?

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• Amazon and bandwidth limits

  - by Dave

  This question may sound weird to some of you but I have never really used cloud and above all I'm still beginner in the web development and would be really thankful if someone could answer few of my question though they may sound weird So I would like to deploy simple website to Amazon, however, I'm concerned about bandwidth as they charge 0.12GB and I'm not able to set budget limit. My problem is that I wouldn't like to pay for 1000GB of bandwidth if someone for some reason decides to download one file constantly So could some of you, who have experience with amazon, tell what happens if my app is able to handle (say 50 req/sec 30kb/page) does that mean that in the worst case I would have to pay req * sec * min * hours * days * page size 50 * 60 * 60 * 24 * 30 * 30kb = 3888GB

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• Connect macbook to my LAN through a VPN - best solution? [closed]

  - by LewisMc

  So I have a LAN connected via a ADSL/PPPoA, this is using a bog-standard DLink router supplied by my ISP (talktalk UK). I have a NAS within the LAN that is running FreeNAS and I want to be able to connect to it when I'm out and about. It's running an atom so it's quite low on juice consumption but I don't want to have it on all day and night so I've been waking it via a magic packet and booting it down from the web admin when I need it. So I want to connect to the LAN, I presume via a VPN, to be able to send a magic packet. But what is the best method to accomplish this, or is there an easier way? I've been looking at the cisco 857 integrated router and the Netgear prosafe 318(behind modem) but not sure If I'm on the right track with what I want to achieve as I've not much experience or knowledge with VPN's or networking (software engineering student). I have tried port forwarding but to no avail, either with magic packets or even connecting outside the LAN via DYNDNS. Thanks,

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• Best (physical) DRM free MP3 players [closed]

  - by alex

  I'm looking to purchase an MP3 player soon. It should: Be compatible with Windows Media Player Hold at least 40 GB Be completely DRM free Be reliable and well built. I don't want to repeat my iRiver experience. Be small enough to be comfortably carried in my pocket. I don't care about looks, this can be the ugliest beast ever. Knowing this, what should I buy? [I figured this is almost on topic for Super User, if not: vote to close it.]

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• SQL Server 2008 data migration to another SQL 2008 server

  - by Confy

  I am currently running SQL server 2008 (SQLserverold) which homes databases for systemn center Service Manager 2012 Datawarehouse. This server is very old and needs to be decommisioned. Prior to decomissioning the serve, the databases have to be migrated to another clustered SQL server with two nodes(SQLServer1 and SQLserver2). I am not a DB admin no experience in SQL, and I have been given the task of migrating the Databases on the old server to the new custered environmnet. Can some point me to the right direction as to how i could do this. Step by step instruction would be helpful. Thank you in advance confy

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• In place SQL 2008 upgrade vs. Side by side?

  - by Jim

  I have a SQL 2005 Std edition server with 5 databases in production, 4 db's are used by web-based apps the 5th is a desktop application. My question is should I perform an in-place upgrade or a side-by-side by creating an sql2008 instance on the same box? The machine is a VM on vmware and I'm planning on taking a snapshot before the upgrade and having a 'blackout' window during the upgrade so that I could roll back to the snapshot if things go really bad. Any previous experience and advice is appreciated.

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• Best practice for administering a (hadoop) cluster

  - by Alex

  Dear all, I've recently been playing with Hadoop. I have a six node cluster up and running - with HDFS, and having run a number of MapRed jobs. So far, so good. However I'm now looking to do this more systematically and with a larger number of nodes. Our base system is Ubuntu and the current setup has been administered using apt (to install the correct java runtime) and ssh/scp (to propagate out the various conf files). This is clearly not scalable over time. Does anyone have any experience of good systems for administering (possibly slightly heterogenous: different disk sizes, different numbers of cpus on each node) hadoop clusters automagically? I would consider diskless boot - but imagine that with a large cluster, getting the cluster up and running might be bottle-necked on the machine serving the OS. Or some form of distributed debian apt to keep the machines native environment synchronised? And how do people successfully manage the conf files over a number of (potentially heterogenous) machines? Thanks very much in advance, Alex

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• memtest86+ crashing on server

  - by user148723

  we have a few DELL 1950 servers. 1 of this servers has CentOS6.3 and its randomly rebooting so I suspected it was hardware. (no log generated) the other 4 servers do not randomly reboot. We passed memtest86+ on the 5 servers, and on 3 of them memtest86+ crashes (displaying an odd and colorful screen, like if a video card failed) Although I tested old memtest86 (not +), and all servers did not crash. I also tested other RAM testers utilities, no tool failing. have any of you guys experience this? thanks

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