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  • Turning a running Linux system into a KVM instance on another machine

    - by Charles
    I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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  • How to secure a new server OS installation

    - by Pat R Ellery
    I bought (and just received) a new 1u dell poweredge 860 (got it on ebay for $35). I finished installing Ubuntu Server (Ubuntu Server 12.04.3 LTS), install apache/mariadb/memcache/php5 works great but I am scared about security. so far I am the only one using the server but eventually more people (friends, friends of friends) will use this server, use ssh etc... I want to know what can I do to secure all the information and not get hacked, both from the web or ssh or ddos and any other attack possible. Does Ubuntu Server does it for you right away? or I have to fix it my self? Thank you EDIT: I installed (so far): All dev tools ssh server LAMP I didn't install: Graphical interface

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  • Switching To Ubuntu 14.04 from Windows 8.1

    - by Asangam
    everyone i am newto these linux stuffs. Currently i'm a user of Windows8.1 . When windows 8 was roling out i was like i'm never going to leave and will be always stick to windows8 but now i think it's time to switch linux because being in windows forever i don't think i can do something very good .I wanted to be OpenSource :) . So i really dont have any idea about linux . For me the best distro is Ubuntu and Kubuntu offcourse the latest release . So what i'm afraid of switching to linux is its compability .The compatibility i'm talking about is with the hardware's and driver's . For eg sometime after fresh install of windows we need to install the display,usb and wifi drivers to function . For some computer or brands those driver's are hard to find and i can't even think of linux how hard are they to find if it needs installing drivers. So my main question is that do i need to install the drivers for my wifi adapters display and some other stuffs or the distro i choosed i.e Ubuntu 14.0.4 consists of those dirvers and what about the 64 and 32bit . My machines is 64bit aso do i need to install the 64bit one . I mean i know the advantages of installing the 64 bit one but like windows is it kinda hard to find softwares for the 64 bit one . Or the 32 bit is recommended . And Yes I will be highly appreciated for the answers to my questions . Thank You :)

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  • Active Directoy GPO

    - by Phillip R.
    I am looking into some weird issues with active directory and group policy. This domain has been upgraded from windows NT and has a few different administrators over the years. I am looking through the Default Domain group policy and Default Domain Controller group policy. In the security areas and I will use the log on locally area as an example, it shows SIDes that begin with asterisks and are quite long they look sort of like the following *S-1-5-21-787626... Normally, when I see something like this I would think that the User account was no longer there and this was never cleaned up. Am I wrong in my assumption? Thanks in advance

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  • Enterprise Data Center System Admin/Engineer to Server Ratio

    - by Bob
    I know there have been similar questions asked over the last few months however looking at a Data Center Operations and know there are some really smart people out there that might be able to help. Looking for some staffing best practices based on first hand experience and was hoping that there is some experience in this area that can provide "best practice" application: Three High Availability (99.99% plus) Enterprise Level Data Centers geographically dislocated, one manned 24x7x365, one lights out, one co-location running HOT-HOT-HOT supporting a global community. More than 2,000 operating systems consisting of 95% Windows, 5% Linux and Solaris, 45% virtualized, more than 100TB storage. No desktop support, no Network Administration (administrated separately), running N+1 and serving more than 250 Billion page views annually. Based on experience what has been your experience with Server to "Data Center System Administrator/Engineer" ratio? Thanks in advance for your responses.

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  • Synchronizing Mysql Table Schema [on hold]

    - by user1122069
    I have some difficulty keeping track of my SQL changes in a text file in SVN. One solution that I am aware of is to put the SQL queries in files (1.sql, 2.sql...) and to manually load each file at the proper time. Besides missing commas, the process is too cumbersome when builds become more frequent. I have actually taken to asking a co-worker to send me his SQL changes on Skype and we just apply the changes immediately on our local, development, and production servers (using three PhpMyAdmin tabs). I have seen several GUI tools mentioned in similar questions on SO, but these are actually more work and less automated than the aforementioned methods. Is there any standardized process by which this is done in an automated way? I can only guess that large companies build their own mechanisms of keeping track of database schema changes (yet I can't find a word about it - maybe they use files?). This question was closed as off-topic on Stack Overflow, so I am re-posting it here.

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  • Do control groups improve system performances?

    - by qdii
    According to this website, enabling cgroups in the kernel can boost performances by sharing resources in a better way. In particular, the conclusion states that:  Nevertheless, with a little trial and error, cgroups can help you improve the efficiency of your systems’ resource usage and avoid downtime due to overusage of a single service. Kernel seeds, however, recommend to deactivate them altogether. They say: Consider these [kernel] settings poison. They remain nothing but system slow-downs. They are all off by default [in the proposed kernel config file]. Who should I trust?

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  • Personally identifiable information (PII) on shared web hosting

    - by S. Cobbs
    Hey folks, I am providing web hosting services (shared and dedicated) and have had one of my shared hosting clients mention needing an SSL cert for their site where they are collecting insurance quotes in a form, including names and social security numbers. My privacy sense is tingling, and I'm pretty sure it's not legal (in the US) to do this on a shared system, but can't find anything to support my thoughts outside of PCI-DSS, but the customer isn't processing payments through the site so I'm not sure if that applies. I'm reading lots of policy documents where people advise to minimize and manage the PII footprint internally, but as the host I don't want to put all of my customer's clients at possible risk. I'm not looking here for legal advice necessarily, but perhaps someone in a similar position to mine can provide some rule of thumb or point me in the right direction.

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  • sticky bit on NFS file system

    - by Kris_R
    I have a system where to the main server (homes, nfs, ntp, queue...) can log-in only root – all the other users use front-end host with NFS-mounted home directories (RW) and all other software directories (read-only). My problem is, that time to time, if root or normal user with sudo makes some administrative works on front-end some homes of normal users getting sticky bits (drwsr-sr-x). If it happens usually the user can't log-in (as long as permission for his home are not changed to drwxr-xr-x). The last time I saw it after compiling some new software (normal user configure;make) and installation from the same directory as root (su and make install or direct as normal user sudo make install). Can somebody explain me why it happens and what should I do to get rid of this problem? p.s. I'm using CentOS 5.7

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  • IIS is not accepting connections after WIndows system update

    - by user78102
    I've been running a web site for the past year on Windows Home Server 2008 R2. After the March 2012 system updates, the site is no longer accessible to clients. They see this error: website is online but isn't accepting connections. Ping tests to the FQDN of the server are successful and NSLOOKUP returns the correct result. The Internet connection tests out good from the server. I have not changed my internet connection (Comcast Business Internet) or my router configuration (I forward incoming requests from the outside to port 80 of the local IP address of the server). I have tried: Disabling the Windows Firewall. Rebuilding the OS and configuration. I still have the problem. How can I resolve this?

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  • Access logs show someone "GET"ing a random ip, why does this return 200?

    - by Wilduck
    I have a small linux box set up with Apache as a way to teach myself Apache. I've set up port forwarding on my router so it's accessible from the outside world, and I've gotten a few strange requests for pages that don't exist from an ip address in China. Looking at my access_log shows that most of these return 404 errors, which I'm guessing is a good thing. However, there is one request that looks like this: 58.218.204.110 - - [25/Dec/2010:19:05:25 -600] "GET http://173.201.161.57/ HTTP/1.1" 200 3895 I'm curious what this request means... That ip address is unconnected to my server as far as I know, and visiting it simply tells me information about my uid. So, my questions are: How is it that this request is showing up in my access_log, why is it returning 200, and is this a bad thing (do I need to set up more security)?

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  • Any help please, Not reconizing my hard drive

    - by Imperial0007
    If any1 can help would be much appreciated.. I recently build my own PC would like to use for gaming etc.. (With Ubuntu of course as my OS) Installed Ubuntu via Flash Drive Everything is connected. Purchased a Graphic card/GPU GPU info;(XFX Double D R9 270 925MHz Boost 2GB DDR5 DP HDMI 2XDVI Graphic card) Now my problem is when i put the CD to install the GPU Drivers it would not recognize the HDD So why is the hard drive not being recognized HDD info;(ADATA USA Premier pro SP600 32GB SATA) I am able to enter the BIOS menu (If that helps) Any help would be much appreciated & Thanks in advanced

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  • Unable to Install ubuntu onto a blank hard drive

    - by user287561
    I just built a pc and I am trying to install Ubuntu 14 onto it. I did the process in which you format the flash drive to be able to have Ubuntu 14 and install directly in BIOS. BIOS is set up to boot from the flash drive. Every time I try to do the install process, it will randomly reboot itself onto the motherboard BIOS menu. This loop constantly occurs and the only way I can use Ubuntu is to put the option of trying but not installing. HELP!

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  • mod_security: How to allow ssh/http access for admin?

    - by mattesque
    I am going to be installing mod_security on my AWS EC2 Linux instance tonight and need a little help/reassurance. The only thing I am truly worried about right now is making sure my (admin) access to the instance and webserver is maintained w/o compromising security. I use ssh (port 22) and http (80) to access this and I've read horror stories from other EC2 users claiming they were locked out of their sites once they put up a firewall. So my question boils down to: What settings should I put in the mod_security conf file to make sure I can get in on those ports? IP at home is not static. (Hence the issue) Thanks so, so, so much.

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  • Low Level Software and Devices

    - by user271619
    I'm looking at a new chapter in my career. I'm a web developer, but now I'm starting to play around with C, compilers, and things I didn't have to work with before. It's all very intriguing! As I'm getting more and more into the "lower level" arena, I'm wondering how devices (mice, printers, webcams, microphones, etc...) are controlled, managed, detected, or used in general with software. I ask because I'm really having a hard time finding straightforward documentation online describing or giving examples of how hardware interacts with software. Does someone know of decent sites that can get me started learning this?

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  • Open source Entity-Component game [on hold]

    - by Papavoikos
    I've been reading a lot about entity-component design but every article talks about the philosophy behind such design, leaving a lot of details and implementations outside. I'm looking for an open source game that uses the entity-component design so I can study the concrete implementations and see how they deal with things such as How (and if) they deal with inter-component communication How much logic each component has or doesn't have How a subsystem can change it's behavior depending on an entity's state (the screen darkens depending on the player's health)

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  • How can I disallow a user's scripts from accessing anything above their user folder?

    - by Jaxo
    This is probably an extremely simple question to answer for anybody who knows what they're doing, but I can't find any answers myself. I'm trying to set up a subdirectory for my good friend to test his PHP scripts on my (Apache) hosting plan. I don't want to let him access anything else on my server, however, for obvious reasons. His FTP login already leads him to the proper directory, which does not allow navigating any higher than it's root (mydomain.com/friend/). I would like the same behavior to be applied to any scripts, so he cannot simply <?php print_r(glob("../*")); ?> and view all my files. I'm thinking this can be done with an .htaccess file setting the DocumentRoot somewhere, but I can't have the file available for modification inside the user directory. Is this possible without majorly rewiring the web server? I've tried Googling all sorts of things to describe my problem, but without the proper terminology, all I get is "shared hosting" websites and people trying to sell me security packages.

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  • messed System Files on Mac PPC

    - by glider
    My buddy deleted her System folder from her PPC Mac wanting to get that space for something else. She copied it first in another drive (she had partitioned disk).She haven't emptied the Trash Bin yet. The screen just froze right after she moved the folder to Trash. We tried to use the install disk but even if we try Power-C on booting,it would try to continue,display the apple logo page then quickly follow it with black screen filled with dumps of hex codes and "We are hanging here..." We have a Windows-based PC that we tried to connect using ethernet cable but we can't find her computer from there. What should we do now???

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  • \windows\system32\config\system is corrupt or missing

    - by user16877
    Hi I had a server pc with the following error. \windows\system32\config\system is corrupt or missing As to fix it i replaced the files instructed here http://support.microsoft.com/kb/307545. Problem solved and I was able to boot up to windows desktop. But now none of the usb ports recognize any of the usb devices such as mouse, keyboard, thumbdrive nada... The usb mouse powers up (the light at the bottom lids up) but no functionality. Has anyone experienced this kind of behaviour any tip is really appreceiated. PS:There is no PS2 ports for both mouse and keyboard. Edit: Same behaviour persists in Safe mode also.

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  • Ubuntu 14.04 install on hardware with RAID

    - by nolak
    I've just built a new machine using an ASUS Mobo with 8GB of RAM and set up RAID 10 with 4 new HDD. I want to install Ubuntu 14.04 on it and so far have tried to do so 3 times with no luck. The installation seems to work fine but after it has finished it restarts and all I get is a black screen. Is there something I am missing? I've completed the install on other machines before without issue I just never tried it on a machine with RAID set up.

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  • windows 7 Home Premium (64 bit) won't boot up, I've tried system repair startup

    - by KamilB
    I've been trying to get my computer to boot up in the last 2 hours. I've tried using the system repair at start up, but all that does is it sends me to a screen with the stock Windows background that is enlarged with a cursor on the screen. It's not frozen and I can move the cursor around, but there is nothing to click on. I've tried to get into Task Manager and such, but the shortcut doesn't work. I have no back ups of the OS as it came pre-installed on the computer. Is there anyway for me to get my computer to work (I don't mind starting fresh)? I do have access to another computer but it's my brothers and it has Windows XP (I'd like to keep my Windows 7).

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  • ID Badge Access System for Building with Active Directory Integration [closed]

    - by Alex
    I hope this is the right place for this question. So, we're looking into setting up a building access that uses badges or cards of some kind. I wanted to ask the users on here if they've had to do such setups and/or if they have recommendations? Is there maybe a system that integrates with Active Directory? I know one of the things our managers want to do is to be able to run reports on when people are entering the buildings. I'd appreciate any suggestions and thanks in advance!

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  • ssh (openSSH) questions

    - by Camran
    I have ubuntu 9.10 server. Firstly, is OpenSSH the same as SSHD? Secondly, In the terminal when typing whereis sshd i get this: whereis sshd /usr/sbin/sshd Also when typing whereis openssh i get this: whereis openssh /usr/lib/openssh How do I know if I have openssh? Also, some tutorials online suggest opening sshd_config, so when typing this: whereis sshd_config /usr/share/man/man5/sshd_config.5.gz // I get this... What should I do, because as you have answered my other Q about security, you have pointed out that it is the way you configure your ssh and etc which is important. Is there any guide for this? How should I configure this? I will be the only user for this server btw... If you need more input let me know and I will update this Q. Thanks

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  • ssh (openSSH) questions

    - by Camran
    I have ubuntu 9.10 server. Firstly, is OpenSSH the same as SSHD? Secondly, In the terminal when typing whereis sshd i get this: whereis sshd /usr/sbin/sshd Also when typing whereis openssh i get this: whereis openssh /usr/lib/openssh How do I know if I have openssh? Also, some tutorials online suggest opening sshd_config, so when typing this: whereis sshd_config /usr/share/man/man5/sshd_config.5.gz // I get this... What should I do, because as you have answered my other Q about security, you have pointed out that it is the way you configure your ssh and etc which is important. Is there any guide for this? How should I configure this? I will be the only user for this server btw... If you need more input let me know and I will update this Q. Thanks

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  • Input string was not in a correct format.

    - by Jon
    I have this error which doesn't happen on my local machine but it does when the code is built by our build sever and deployed to the target server. I can't work out what the problem is, after having spent many hours on this issue. Here is an error trace: [FormatException: Input string was not in a correct format.] System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +7469351 System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119 System.Byte.Parse(String s, NumberStyles style, NumberFormatInfo info) +35 System.String.System.IConvertible.ToByte(IFormatProvider provider) +46 System.Convert.ChangeType(Object value, TypeCode typeCode, IFormatProvider provider) +199 System.Web.UI.WebControls.Parameter.GetValue(Object value, String defaultValue, TypeCode type, Boolean convertEmptyStringToNull, Boolean ignoreNullableTypeChanges) +127 System.Web.UI.WebControls.Parameter.GetValue(Object value, Boolean ignoreNullableTypeChanges) +66 System.Web.UI.WebControls.ParameterCollection.GetValues(HttpContext context, Control control) +285 System.Web.UI.WebControls.SqlDataSourceView.InitializeParameters(DbCommand command, ParameterCollection parameters, IDictionary exclusionList) +251 System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +476 System.Web.UI.WebControls.SqlDataSource.Select(DataSourceSelectArguments arguments) +19 Customer_NewTenancyList.BindReport(GridSortEventArgs e) +442 Customer_NewTenancyList.Page_Load(Object sender, EventArgs e) +345 System.Web.UI.Control.OnLoad(EventArgs e) +73 baseRslpage.OnLoad(EventArgs e) +16 System.Web.UI.Control.LoadRecursive() +52 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2170 Here is my own trace: Begin PreInit aspx.page End PreInit 3.12888928620816E-05 0.000031 aspx.page Begin Init 7.43111205474439E-05 0.000043 aspx.page End Init 0.00122138428208054 0.001147 aspx.page Begin InitComplete 0.00125379063540199 0.000032 aspx.page End InitComplete 0.00127781603527823 0.000024 aspx.page Begin PreLoad 0.00131022238859967 0.000032 aspx.page End PreLoad 0.00133424778847591 0.000024 aspx.page Begin Load 0.00135575890231859 0.000022 Page_Load 0.00145996209015392 0.000104 BindReport 0.0014856636807192 0.000026 Parameters add start: 30/03/2010 30/04/2010 0.0015569017850034 0.000071 Parameters add ended 0.00160048274291844 0.000044 Trace 1 0.00162450814279468 0.000024 Unhandled Execution Error Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.Byte.Parse(String s, NumberStyles style, NumberFormatInfo info) at System.String.System.IConvertible.ToByte(IFormatProvider provider) at System.Convert.ChangeType(Object value, TypeCode typeCode, IFormatProvider provider) at System.Web.UI.WebControls.Parameter.GetValue(Object value, String defaultValue, TypeCode type, Boolean convertEmptyStringToNull, Boolean ignoreNullableTypeChanges) at System.Web.UI.WebControls.Parameter.GetValue(Object value, Boolean ignoreNullableTypeChanges) at System.Web.UI.WebControls.ParameterCollection.GetValues(HttpContext context, Control control) at System.Web.UI.WebControls.SqlDataSourceView.InitializeParameters(DbCommand command, ParameterCollection parameters, IDictionary exclusionList) at System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) at System.Web.UI.WebControls.SqlDataSource.Select(DataSourceSelectArguments arguments) at Customer_NewTenancyList.BindReport(GridSortEventArgs e) at Customer_NewTenancyList.Page_Load(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at baseRslpage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) And here is my code: Trace.Warn("BindReport") Dim sds As New SqlDataSource sds.SelectCommand = "C_MYSTORED_PROC" sds.ConnectionString = ConfigurationManager.ConnectionStrings("connstring").ConnectionString sds.SelectCommandType = SqlDataSourceCommandType.StoredProcedure Trace.Warn(String.Format("Parameters add start: {0} {1}", dpFrom.Text, dpTo.Text)) sds.SelectParameters.Add(New Parameter("FROMDATE", DbType.DateTime, dpFrom.Text)) sds.SelectParameters.Add(New Parameter("TODATE", DbType.DateTime, dpTo.Text)) Trace.Warn("Parameters add ended") Dim dv As DataView Dim dt As DataTable Trace.Warn("Trace 1") dv = sds.Select(New DataSourceSelectArguments()) Trace.Warn("Trace 2") If e IsNot Nothing Then dv.Sort = String.Format("{0} {1}", e.SortField, e.SortDirection) Trace.Warn("Trace 3") Else gvReport.CurrentSortColumnIndex = 0 gvReport.Columns(0).SortDirection = "DESC" Trace.Warn("Trace 4") End If Trace.Warn("Trace 5") dt = dv.ToTable() Cache("NewTenancyList") = dt Trace.Warn("Trace 6") Trace.Warn("About to databind") gvReport.DataSource = dt gvReport.DataBind() Trace.Warn("Databinded") What I don't understand and this is really weird, why does it work on my local machine but not on the live server? If i build the code on my local machine then copy over the complete \bin directory it works. If I pull the code from source safe, build then copy, I get this error. It seems to choke after the line "dv = sds.Select(New DataSourceSelectArguments())" in the code.

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