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  • Failover of mirrored webservice

    - by eflat
    We are using a webservice (over http) which has 2 mirrored servers, accessible as, say www.blah.com and www2.blah.com. Is there a software solution that would help us handle failover? Currently if one server becomes unavailable, I need to manually edit our config to point at the other server. Failover on their side is "in the works", so I don't want to do checking for server availability in code. On our side, we use a mix of linux and windows boxes, so we have both os's in the cage.

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  • Can't get iptables firewall working correctly

    - by Jay
    I'm setting up a new Centos 5.6 system and can't get my iptables firewall to work correctly. it won't let me use SSH through it. I'm new to Centos but not to Linux or iptables. I've been removing things until I have isolated the problem. I set up the firewall with a default ACCEPT rule for the INPUT chain. I can connect through to the server fine. If I change the command to only allow traffic from the interface connecting to my trusted network it stops working. Working: iptables -A INPUT -s 0/0 -d 0/0 -j ACCEPT Failing: iptables -A INPUT -i eth0 -s 0/0 -d 0/0 -j ACCEPT I've double checked the ip address I'm using corresponds to eth0 using ifconfig. Any ideas where I went wrong?

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  • Can I use VT-D with a windows host for a VM?

    - by Journeyman Geek
    I've got a fairly beefy gaming system that I also run occational virtual machines on. It runs windows 8 and the built in hyper V virtual machine software at the moment and has a core i7 3770 (which unlike the unlocked model, should support VT-D), an Asus P8Z77V and a gforce 660 video card(also asus). I figure that if I could use VT-D I could add a cheap dedicated 3d card for a VM, in case I wanted somewhat more than the 'basics'. I know KVM and Xen support this to some level on linux, but can I do so on windows? I'm open to switching VM software if need be.

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  • what to learn & practice to be a programmer (not for Job) [closed]

    - by Hanan N.
    I want to be able to write programs (tools) for my own needs, and I want to tell the computer what to do, not to be strict to what other's told it to do. I have a good knowledge of Linux & Windows, I am also have a bit of Python in my head, but I think that I need some guidance on what languages or practices to invest my time into in order to be able to tell the computer what to do. I know there is a lot of posts similar to what I am asking here, but there is a big difference and so I have opened this thread. My goal isn't to work at a company, so I don't need to learn how to work as a team, I don't need to learn as much how to maintain my code nor how to write it nice for others to understand (I know it is important but not for me). I don't want to learn it as a profession, but as a serious hobby (you can call it hacking as long as you know what cracking means), my end goal is to be able to understand other's people code, and to write my own code with a lot of deep knowledge of the ins and outs of the computer system in order to gain from it as much as I can. So in essence my questions are: How can I understand, in depth, computers, in order to exploit them as much as I can? What should I learn? Are there any books that I should read? Is it possible to do this, or do I have to learn every aspect of programming?

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  • mysql Incorrect Information in File: (corrupt) error

    - by Nick M.
    I've recently suffered from a power outage on one of my monitoring servers at the office. The result of that outage caused for some database tables to get corrupted. I've successfully repaired 3-4 tables by using the "use_frm" option however there are still 3 that seem to be badly corrupted and are not responding to the mysql REPAIR command (with or without use_frm) mysql> REPAIR TABLE poller_item; +-------------------+--------+----------+---------------------------------------------- ------------+ | Table | Op | Msg_type | Msg_text | +-------------------+--------+----------+------------------------------------------------- ---------+ | cacti.poller_item | repair | Error | Incorrect information in file: './cacti/poller_item.frm' | | cacti.poller_item | repair | error | Corrupt | +-------------------+--------+----------+------------------------------------------------- ---------+ In this scenario are there any other way to repair a table? MySQL Version mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) using readline 6.1

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  • Problems with the backup

    - by marcodv
    I did a script which run around 4 o'clock in the morning, for backup all the mysql databases and the config file for 250 linux vm. The problem is that it tooks ages for complete and more than 50% of these vm, need more than 8 hours for complete. More or less all the vm had the same configuration,I mean Same amount of ram same amount of disk space same number of cpu Debian 6.0.5 I am saving these backup on amazon s3, because is the cheapest solutions that I've found. Now my questions is: Has anyone some solutions or suggestions about that? On one blog I've read that probably the ionice and nice combination could be good work around about that. any thought?

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  • Upgrade Subversion 1.6 to 1.7 on CentOS? (can't find yum repository)

    - by user743919
    I want to upgrade my SVN Server from 1.6 to 1.7. Unfortunately I can't find anything on the internet how to do this with yum. I have checked rpmforge-extras but it has only svn 1.6 and not 1.7 I wanted to update with yum because this is the most secure way for me. I'm not an experienced Linux user. Is there a yum repository that contains 1.7 (subversion.x86_64 0:1.7.xxxxx.el5.rfx) I hope somebody can help me out? If there is non, perhaps a short explenation how to update with just step by step.

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  • how to restore windows 7 to a know working state every time it boots

    - by Artanis
    A couple of days ago my mother asked me to set up a computer at his house, she wants to use it to basic web browsing, video chat and nothing more. The problem is, neither my mother nor my sister know anything about using or maintaining a computer. What I want is to have a working base install of windows 7 and just discard everything installed, downloaded, ... when it reboots. That way I can set up a partition just for saving files and whatever they do the computer will always return to a working state at start up. can that be done? PS: Sadly linux is not an option since my sister wants to be able to play some games with my steam account and not all of them run with wine.

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  • Is there a direct URL to download Java JDK updates?

    - by Bob Cross
    I have a whole set of machines that are on the other side of a firewall configured to prevent all Javascript from functioning. All of them (Linux 32 and 64 bit configurations) must be updated to Java 6 update 20. This is a problem given Sun/Oracle's URL redirector and download manager: they simply don't appear or don't work. Is there a URL to download the JDK updates and bypass the redirect? Obviously, a yum configuration that would allow for automatic updates would be optimal but I'd be happy to just have the rpm file.

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  • Type 1 Hypervisor on the desktop

    - by Blazemore
    I have a powerful home PC, and I've used VirtualBox to run Linux distros in Windows (and vice versa). I'm interested in trying out a lightweight type 1 hypervisor to run all my operating systems (Windows 7, Debian, Arch) and was looking for suggestions of which to pick and how to implement this. From what I gather, a type 1 hypervisor is a lightweight OS which simply provides VM management functionality. Will I get reasonable performance under each guest OS? Can all the guest OSs have access to a shared data drive, or is is best to have a storage server in another guest OS and mount it over the virtual network? What about gaming, is this feasible, or will I realistically need to run Win7 on bare metal? I'd appreciate any input.

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  • Domain model integration using JSON capable DTOs

    - by g-makulik
    I'm a bit confused about architectural choices for the java/web-applications world. The background is I have a system with certain hardware components (that introduce system immanent active behavior) and a configuration database for system meta and HW-components configuration data (these are even usually self contained, since the HW-components persist configuration data anyway). For realization of the configuration/status data exchange protocol with the HW-components we have chosen the Google Protobuf format, which works well for the directly wired communication with these components. Now we want to develop an abstract model (domain model) for those HW-components and I have the feeling that a plain Java class model would fit best for this (c++ implementation seems to have too much implementation/integration overhead with viable language-bridge interfaces). Google Protobuf message definitions could still serve well to describe DTO objects used to interact with a domain model API. But integrating Google Protobuf messages client side for e.g. data binding in the current view doesn't seem to be a good choice. I'm thinking about some extra serialization features, e.g. for JSON based data exchange with the views/controllers. Most lightweight solutions seem to involve a python based presentation layer using JSON based data transfer (I'm at least not sure to be fully informed about this). Is there some lightweight (applicable for a limited ARM Linux platform) framework available, supporting such architecture to realize a web-application?

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  • How to move a windows machine properly from RAID 1 to raid 10? [migrated]

    - by goober
    Goal I would like to add two more hard drives to my current RAID 1 setup and create a RAID 0 setup on top of the two RAID 1 setups (which I believe is referred to as "RAID 10"). Components Involved Intel P68 Chipset Motherboard 4 SATA ports that can be configured for Raid An intel SSD cache that sits in front of the RAID, and a 64 GB SSD configured in that manner Two 1TB HDDs configured in RAID 1 OS: Windows 7 Professional Resources Consulted so far I found a great resource on LinuxQuestions.org for a good "best practices" process for Linux machines, but I'd like to develop a similar process that I know works on Windows Machines.

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  • Server 2003 Filter mobile devices via MAC

    - by msindle
    At one of my client's sites I need to keep my users unauthorized devices off the wireless. They all know the SSID and Password because many of them have laptops that need the wireless. I'm running out of IP address's and we have sent out numerous emails asking them to stay off, but like most users they ignore IT's email. I'm currently running Server 2003 as the GC/DC (but have 2008 servers in place) and 2 Netgear WNAP320. I've seen several posts similar to what I'm looking for but they seem to deal with Linux. My question is how do I go about doing this without migrating (scheduled for the end of the year) to a new server and is it possible to do this within Server 2003? Thanks msindle

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  • Options to efficiently synchronize 1 million files with remote servers?

    - by Zilvinas
    At a company I work for we have such a thing called "playlists" which are small files ~100-300 bytes each. There's about a million of them. About 100,000 of them get changed every hour. These playlists need to be uploaded to 10 other remote servers on different continents every hour and it needs to happen quick in under 2 mins ideally. It's very important that files that are deleted on the master are also deleted on all the replicas. We currently use Linux for our infrastructure. I was thinking about trying rsync with the -W option to copy whole files without comparing contents. I haven't tried it yet but maybe people who have more experience with rsync could tell me if it's a viable option? What other options are worth considering?

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  • Backup windows image to thumb drive?

    - by Dean
    I recently bought a new netbook from Malasia. It doesn't have a brand name, or officially supporting drivers. It came with a version of windows, and working drivers for all the hardware - but I want to install Ubuntu on here. Being a netbook, it has no CD/DVD drive. I want some free easy to use software to image the entire drive onto a thumb drive, which I could later use to boot up a recovery program to reinstall windows, should I fail to get all the hardware supported on Linux. I have already done some research and found driver backup/restore software in this thread, and will probably use that failing a more all-encompasing solution.

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  • Binding backward-kill-word to Ctrl+w

    - by nocturnal
    I'm trying to switch from prolonged use of Tcsh to recent exploration of Bash. I've managed to port over all my favorite features, except for Ctrl+w which treats spaces and slashes as word boundaries, most likely backward-kill-word. In Bash however readline deletes all the way to the first space, deleting all slashes between. I've tried many various combinations of \C-w: backward-kill-word in both .inputrc and .bashrc using bind but I can't get it to work the way I want. Funny enough, through Putty from Windows at work I can use Alt+Backspace, which also the manual says is the default binding, to produce the exact behavior I want. But in Terminal.app on my Macs at home this does not work. Same goes for any FreeBSD or Linux server I happen to be logged into from Terminal.app. So I turn to superuser for help.

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  • Set up a "relay" service

    - by trikks
    Hi! I'm trying to create a 'left client' server < 'right client' setup but need some advice and tips. Let's say that I have a server-daemon on the left side, like a vnc-server that connects to the middle server. On the right side I've got a client that want to connect to the left server-daemon, but it has to be done through the middle server. I assume this should be done with some tunneling service. The server environment is a fully featured Debian Linux or Mac OS X Server host. Any idéas? Thanks / Trikks

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  • Make user uploads go to different hard drive?

    - by Andrew Fashion
    I am using a pre-made social networking script where all user uploads go to site.com/public/user/ How can I make /public/user/ my secondary hard drive so all user uploads are uploaded to my second harddrive and not the primary hard drive. I have over 100GB of images, and I want them on my other HDD now. Thank you. I am running CentOS 5.5 64bit w/ Apache and PHP I have two 250GB Sata HDDs sudo parted /dev/sda print Model: ATA WDC WD2500KS-00M (scsi) Disk /dev/sda: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 8595MB 8488MB primary linux-swap 3 8595MB 10.7GB 2147MB primary ext3 4 10.7GB 250GB 239GB extended 5 10.7GB 250GB 239GB logical ext3 Information: Don't forget to update /etc/fstab, if necessary. 5 10.7GB 250GB 239GB logical ext3

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  • Copy an Amazon EC2 Instance to use locally

    - by Excolo
    Ok, so we have a spare server I have installed Debian Wheezy on, and setup Xen on for virtual machines. It has better performance than all our ec2 instances combined, and will cost less to run (for a few various reasons) I would like to get the EC2 instances downloaded to my server, and converted to run for Xen, but im having difficulty finding anything specific. I did not setup the EC2 instances myself, and am not very familiar with them. Everything I have found (which isnt much) just says "Do XYZ" and I have no idea how to do those. So being as specific as possible would be helpful. Also, confusingly I see people writing in forums saying you can only export linux images (which mine are, Ubuntu images) but then I see on amazons export tool saying you can only export Windows server? Am I missing something here? Is that not the right place to be looking? Thanks

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  • Creating bootable Fedora USB with persistent storage

    - by dooffas
    I am attempting to burn the full Fedora 19 x86_64 DVD iso to a USB drive and have a separate partition on it for a kickstart file / other media that will be installed in the kickstart process. With the Ubuntu server 12 iso, you can simply dd the iso to the usb drive: dd if=/path/to/iso of=/dev/sdb Once the iso has been burnt, open gparted and create a ext2 parition in the allocated space. However, this does not seem to work with the Fedora ISO. When loading the USB drive in gparted I get a warning and an error: Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Error: The partition's data region doesn't occupy the entire partition. Ignoring both of these errors allows gparted to load the usb drive, however it shows a blank drive with no partition table. Has anyone come across this before? From what I have found, it may have something to do with the fact that Fedora use isohybrid.

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  • Oracle Secure Global Desktop (SGD) 5.1

    - by wcoekaer
    Last week, we released the latest update of Oracle Secure Global Desktop. Release 5.1 introduces a number of bug fixes and smaller changes but the most interesting one is definitely increased support for html5-based client access. In SGD 5.0 we added support for Apple iPads using Safari to connect to SGD and display your session right inside the browser. The traditional model for SGD is that you connect using a webbrowser to the webtop and applications that are displayed locally using a local client (tta). This client gets installed the first time you connect. So in the traditional model (which works very well...) you need a webbrowser, java and the tta client. With the addition of html5 support, there's no longer a need to install a local client, in fact, there is also no longer a need to have java installed. We currently support Chrome as a browser to enable html5 clients. This allows us to enable html5 on the android devices and also on desktops running Chrome (Windows, MacOS X, Linux). Connections will work transparently across proxy servers as well. So now you can run any SGD published app or desktop right from your webbrowser inside a browser window. This is very convenient and cool.

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  • rsync assigns deny permission

    - by user773478
    Currently a script is used to copy files using rsync (version 2.6.9 protocol version 29) from Linux/Unix servers to W2K3 server using very basic command such as "rsync -v source_server::share_name/file_name /cygdrive///file_name" The script further makes copy of this downloaded file for other purposes. This is part of a larger middleware that is being moved to new hardware on W2K8R2 Second part of making copy of the file does not work using more recent rsync client version 3.0.7 protocol version 30 (shows up as cwRsync in add/remove programs) Reason being rsync assigns special permissions to file that includes deny. The user (service account) which downloads the file is in local admin group. The file can be copied elsewhere using rsync. It can be deleted. But cannot be opened or copied locally by same user as deny permission supersedes.

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  • DNS issues on my iPhone

    - by mattalexx
    I'm trying to call up "https://m.google.com" on my iPhone on my home WiFi. It's saying Safari "cannot verify server identity" of m.google.com, then when I press Details, it refers to https://m.google.com as "mattserver". "mattserver" is the name of my development server, a Linux box on my home network. This stinks of DNS issues to me. Accessing the unsecure version of that URL ("http://m.google.com") gives me a blank page. What could be going on here? Is there a way to look at the logs of my router somehow?

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  • How come I cannot make this file executable (chmod permissions)?

    - by bappi48
    I downloaded Android Development Tool for linux (ADT) and placed it in home directory. After unzipping the files, when I double click the "eclipse" executable file; the eclipse works perfectly fine. But If I unzip the ADT in a different directory, in my case directory E: (is shown when I boot in windows 7) There double clicking the same "eclipse" executable file does not run eclipse. It shows error message: Could not display /media/Software/00.AndroidLinux/ADT/eclipse/eclipse. There is no application installed for executable files. Do you want to search for an application to open this file? If I press yes in the Dialog, it finds "Pypar2" which is not my solution. I found that the "eclipse" file permission is following -rw------- 1 tanvir tanvir 63050 Feb 4 19:05 eclipse I tried to change the permission by "chmod +x eclipse" , but no use. This command does not change the file permission at all in this case. what should I do? Relevant output of cat /proc/mounts: /dev/sda6 /media/Software fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0 Please not that I'm new to Ubuntu and still learning day by day.

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  • Ubuntu 12.04 Full Screen without Unity Hub

    - by Xatolos
    I couldn't find an answer for this, so I thought I would try here. My problem is, I have some games on Wine that play in full screen mode but I can't really get them in full screen mode. When they start up, they end up with the GUI's "HUD" overlapping the game which is really annoying and well kills the option to play the game. This has also happened in a few of my Linux programs as well. While I wrote its a problem with Unity, it really isn't limited to this though. I've done full screen mode on Unity and had the Unity side bar and top menu overlap, I've used Gnome and had the same issue happen, Gnome menu is in the top, Cinnamon had the same issue. Sometimes if I Alt-Tab out of it and back into the program it MIGHT remove the HUD but that doesn't always work, and lets face it, full screen mode that is killed by the GUI just isn't something that can really be ignored. Any suggestions or help would be highly welcomed. My laptop http://www.cnet.com/laptops/asus-g53jw-a1-15/4507-3121_7-34210244.html edit Seems so far to be an issue with Unity and Gnome being in 3D mode, and possibly an issue with my NVidia card and XServe (I think that was it...). Going to Unity/Gnome 2d modes seem to help with this for the moment...

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