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• Server Security

  - by mahatmanich

  I want to run my own root server (directly accessible from the web without a hardware firewall) with debian lenny, apache2, php5, mysql, postfix MTA, sftp (based on ssh) and maybe dns server. What measures/software would you recomend, and why, to secure this server down and minimalize the attack vector? Webapplications aside ... This is what I have so far: iptables (for gen. packet filtering) fail2ban (brute force attack defense) ssh (chang default, port disable root access) modsecurity - is really clumsy and a pain (any alternative here?) ?Sudo why should I use it? what is the advantage to normal user handling thinking about greensql for mysql www.greensql.net is tripwire worth looking at? snort? What am I missing? What is hot and what is not? Best practices? I like "KISS" - Keep it simple secure, I know it would be nice! Thanks in advance ...

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• Is there an Apache error log viewer for Mac?

  - by Hassan

  I need an app that reads log files to make it easier to look through the hundreds of lines of errors that apache outputs. I've found this nice log viewer app, but it's only available for Windows. It looks like exactly what I need, except for the fact that it doesn't run on OS X. I've also looked into GoAccess, but it can only view access logs, not error logs. I also tried the Console in the utilities folder. It shows the log just as TextEdit would, it does no parsing at all. Is there an app for Mac that parses and displays errors from the apache error log?

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• QoS - split bandwidth across all IPs during high load

  - by Matthew Iselin

  We have a Linux-based router which is currently working fairly well, but our network only has a 1.5 mbps incoming connection. The network is small, but during high load periods some systems can end up dominating the bandwidth. For example, a client downloading a file can easily saturate the connection leaving everyone else with barely any access to the outside world. Naturally, I'd like to fix this. I believe a combination of iptables rules and tc is in order, but I have no idea how to go about distributing the bandwidth evenly across the clients. It would be nice if there was a way to divide the bandwidth only across clients that are actually utilising the connection as well, rather than hard limit each connection to (bandwidth / number of clients).

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• Is it possible to a VM inside a VM (e.g., KVM on Vmware)?

  - by lorin

  I'd like to do some development on Eucalyptus, an open source project which provides an Amazon EC2 interface for launching virtual machine instances on a collection of privately managed nodes. I'd really like to be able to do some of the development on my desktop, rather than having to deploy Eucalyptus on our shared local cluster each time I make a change to the source code. (Especially since there are a group of us sharing that test cluster). Unfortunately, my desktop machine is a Mac, which won't run Eucalyptus natively. I do have VMWare Fusion, and it would be really nice if I could do my Eucalyptus testing inside a VMWare instance. The problem is, to test out Eucalyptus, it will have to launch (KVM or Xen) VM instances. I've got no idea if it's possible to actually launch a KVM or Xen instance inside a VMWare instance.

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• nginx: rewrite a non-existent php-file to another php-file with all arguments

  - by at0m33

  i really need help here. Sitting for some time now and dont figured it out. I want to realize a very simple task - rewrite a non-existent php file to another existant php file with all arguments like: this http://example.com/nonexistent.php?url=google.com to -> http://example.com/existent.php?url=google.com I tried something like this: rewrite ^/nonexistent.php /existent.php; Which dont works (File not found). But redirect a non-existent html file to a php file like this: rewrite ^/nonexistent.html /existent.php; works. I dont want to rewrite a html file, but this is still a confusing behaviour. Therefore it tried also something like this (and some variations): rewrite ^/nonexistent.php?url=^(.*)$ /existent.php?url=$1; which is also not working. (Maybe the syntax is bad) Any help here? It would be very nice!

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• Monitor LSI 3ware raid controller on ESXi

  - by aseq

  This concerns a server that runs ESXi (v. 4.x or 5.x) installed on drives that are configured into a raid10 using an LSI 3ware 97050 raid controller. I would like to know if there is a way to monitor the LSI 3ware series of controllers, in particular the 9750, through ESXi. And to hopefully also run the monitoring daemon LSI provides. I know you can set up a cronjob to execute tw_cli through ssh on the ESXi server. However that's not really ideal. I am not using vcenter by the way. It would be nice to have more than just monitoring working, since the 3ware software has a very useful web client, besides tw_cli.

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• IIS Server on XP Machine with tweaked registry and services

  - by user420667

  I have been trying for some time now to setup a webapp on my XP machine at home. Prior to doing this, I had tweaked the registry settings, fiddled with disabling and enabling servies, without recording what I tweaked, which I imagining could be what's causing the problem. I don't want to "reboot" to factory settings, although I suppose that would be nice to know how to do as well. I am more interested in finding out what settings could have influenced the behavior, and who I could contact / what information I could send them that would aid in solving the problem. Thanks.

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• Throughput tool with decent graphing.

  - by Cory J

  I've been looking through some of the tools available for measuring network throughput, namely iperf, bwping, ttcp, etc. I am planning on doing throughput tests over a long period of time, so what I really need is good graphing output, preferably rrd graphs. The Jperf frontend for iperf will generate a graph, and bmon has a nice command-line graph, but these simply count seconds since the test was started. I am trying to measure trends in throughput over times of the day, so a graph with times and days is necessary. So a way to get iperf to log to RRDs would be best, if this isn't possible could someone point me toward another solution?

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• linux ssh -X graphical applications will not start when system load is high

  - by Chrisv

  So I am using ssh -X to access a server. I am at a Xubuntu desktop accessing a Ubuntu server that is in the next room. Usually everything works fine, but when the system load gets high, any graphical applications I have freeze and fail to be restarted. This happens even if the process that is causing the high load has been niced to a low priority with "nice -n 19". And even though the system load is high, the command line works fine with no delay, and other applications I have running on the server (e.g. virtual machines) run fine. But any graphical application running through X dies. When the graphical applications fail they usually give out an error message that suggests a time-out. It seems that something connected to X has a low priority and times out. But what is it, and how does one fix it?

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• Juniper Networks SRX240 as a office router?

  - by Jordan Mendelson

  We're a small (7 person) fast growing startup who just got our new office and we're having a 100 Mbps line installed from Cogent. I'm not familiar with Juniper devices, however the equivalent Cisco appears to be rather expensive. Features we'd like: Offsite VPN access (PPTP or L2TP IPsec) - something Mac compatible IPv6 support NAT - ideally supporting multiple outside addresses mapped to VLANs DHCP DNS forwarding would be nice QoS to keep our SIP phones happy (managed through RingCentral) VLANs for guest/internal The device is going to be connected to a set of SIP phones as well as two Ruckus 7962s for wireless access. Eventually I'd like to connect it to a Juniper ESX switch as we grow. Would a Juniper SRX240 handle this ok?

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• Is it possible to stream input into RAR

  - by Dscoduc

  I'm using RARLABS RAR.exe to archive/backup my server data. I am familiar with using RAR for creating an archive and adding files from a folder, but what about streaming data directly into an archive? For example, when backing up my MySQL databases I use the mysqldump command that includes a pipe command into a text file. It would be nice to skip the file step and go directly into an archive file using something like the following syntax: mysqldump -uUserName -pPassword --all-databases > rar.exe newarchivename.rar Does anyone know if what I have described, or something similar, is even possible?

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• How to configure Linux to open files by extension?

  - by Gregory MOUSSAT

  The various Linux's desktops open files according to their mime type. This is a very nice feature but I also need to open them by extension (as with Windows). For instance, I want to open every xxxxx.vnc files with a specific program when I double-click on them. I use xfce but I don't think it differs from Gnome or KDE because all of them use the same configuration files (defaults.list and mimeapps.list). If possible the settings are user specific, not system wide. I've found some very poor informations about that, and all are system wide, so may be wiped out by some updates.

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• Postfix performance

  - by Brian G

  Running postfix on ubuntu, sending alot of mail ( ~ 1 million messages ) per day. loads are extremly high but not much in terms of cpu and memory load. Anyone in a similiar situation and know how to remove the bottleneck? All mail on this server is outbound. I would have to assume the bottleneck is disk. Just an update, here is what iostat looks like: avg-cpu: %user %nice %system %iowait %steal %idle 0.00 0.00 0.12 99.88 0.00 0.00 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 12.38 0.00 2.48 0.00 118.81 48.00 0.00 0.00 0.00 0.00 sdb 1.49 22.28 72.28 42.57 629.70 1041.58 14.55 135.56 834.31 8.71 100.00 Are these numbers in line with the performance you would expect from a single disk? sdb is dedicated to postfix. I think it is queue shuffling, from incoming-active-deferred More details from questions: Server: Quad core Xeon(R) CPU E5405 @ 2.00GH with 4 GB ram Load average: 464.88, 489.11, 483.91, 4 cores. but the memory utilization and cpu is minimal Postfix instances between 16 - 32

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• IDN and HTTP_HOST

  - by Sandman

  So, when I want to link my users to a specific page I always use (in php): "http://" . $_SERVER["HTTP_HOST"] . "/page.php", to be sure that the link points to the page they're currently surfing (and not one of the server aliases). But with IDN names, HTTP_HOST is set to "xn--hemmabst-5za.net" (for example) - which of course works but doesn't look very nice. Is there a way to have HTTP_HOST set to the correct IDN name in these cases (in this case - "hemmabäst.net")? I rather do it in Apache before it comes to PHP, because otherwise I'd have to replace all my usage of $_SERVER["HTTP_HOST"]. Any ideas?

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• How Does Failover Clustering Work in Windows 2008 R2?

  - by Kyle Brandt

  I am trying to learn how the failover clustering features works with Windows 2008 R2 as I am going to be using as part of SQL Server 2012 always on. I have been able to find information on how to set it up, and what it does. However, I am having trouble finding a nice technical document on how it actually works in detail (For example with keepalived there are docs that explain how often are heartbeat packets sent, what they look like etc). I know this is a pretty broad question, but I would like to have a good understanding of mechanisms of this feature.

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• PPTPD with PAM authentication?

  - by Richard

  I need a VPN solution for my company. One requirement is to be able to use the built-in windows VPN client. We are running a Debian Etch server. I've managed to set up PPTPD but the authentication is based on the chap-secrets file. We already have all the user accounts set up on the server, so it'd be nice to use PAM authentication to get user/pass directly from the unix login. Is this possible to achieve and how? If not, is there any other VPN solution that can do this? Don't tell me OpenVPN, it needs additional software to be installed on the Windows machines. :)

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• Which mediacenter appliance

  - by Guillaume

  I'm looking to buy a mediacenter appliance, but I am a bit lost by all the offers on the market. Here are the features I am looking for : at least 500Go HDD capable of playing HD (1080p) supporting a good range of video and audio codecs support for subtitles including a DVB-T input (coax) and tuner composite video input 5.1 (or 7.1) analog audio output LAN (100M or Gigabit) fileserver (SMB or NFS) remote control possibly digital output (S/PDIF, TOSLINK, or other) no need for integrated DVD player no need for wifi The Ultio Pro looks nice (http://www.thinkgeek.com/electronics/home-entertainment/d3fe). It just lacks a DVB-T input which is a show killer for me. Thanks for your suggestions.

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• Should I install Windows Management Framework 3.0?

  - by Massimo

  I'm posting this as a BIG CAVEAT to everyone. I know it's not a standard Q&A, but I think this is someone every Windows admin should know. There is a very real risk of falling into Big Troubles. Microsoft has recently released Windows Management Framework 3.0 for Windows Server 2008 and Windows Server 2008 R2 systems, which includes some nice things native to Windows Server 2012 (like PowerShell 3.0) and lots of improvements to WMI, WinRM and other management technologies. Windows Update is advertising it as an optional update. Should I install it on my servers?

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• tool for monitoring network traffic on Windows 7 Home

  - by Xah Lee

  for Windows 7 Home Edition: can anyone recommend a tool to monitor network traffic? either build-in or 3rd-party. I like to have a graph view (e.g. as in Task Manager) but also nice are tool that lets me see what IP/port that's incoming/outgoing. Command line is fine. Or even some tutorial. Thanks. (am old unix sys admin and web app dev. Though not much of a network admin and don't know much Windows. I need this tool just for my home PC, not in any pro capacity.)

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• best practice? Consumer data in MySQL on Amazon EBS (Elastic block store)

  - by jeff7091

  This is a consumer app, so I will care about storage costs - I don't want to have 5x copies of data lying about. The app shards very well, so I can use MySQL and not have scaling issues. Amazon EBS has a nice baseline+snapshot backup capability that uses S3. This should have a light footprint (in terms of storage cost). BUT: the magnolia.com story scares the crap out of me: basically flawless block-level backup of a corrupt DB or filesystem. Is there anything that is nearly as storage efficient as EBS at the MySQL level?

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• What Hypervisors support non-homogenous clusters?

  - by edude05

  I've been using Citrx Xenserver for awhile on a few machines that don't support Hardware Virtualization as a test for various small servers. I recently have been experimenting with moving the PV Vms between machines but Xenserver gives me errors that roughly say I need to have homogenous hardware for this to work. Because of this I haven't been able to setup XenMotion or any of the nice features that come with server pooling in Xenserver. I'm considering moving away from XenServer, however I can't seem to find a Hypervisor that explicitly supports non-homogenous clusters. On a side note, we do have a few idenitally configured Dell 1950s that haven't had any VM solution setup on yet, so if we can find a solution that can allow us to move PVs to those as well that would be great. Non free solutions are OK as well. What hypervisor will allow this? Thanks!

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• How to run MS C++ 6.0 on Windows 7

  - by hotei

  I have MS Windows C++ version 6.0 on XP. I'd like to move it to a Windows 7 platform but when I try to install it there I get some garbage about it not being compatible, proceed at your own risk etc. When I proceed, it (not surprisingly) doesn't work. Is there a way to convince these Microsoft tools to play nice with each other? I have Win7 home edition, but I would be willing to upgrade to Win7 Pro IF I knew it would work under the "XP emulation" mode. Failing both those options, what is the least expensive "upgrade" path for C++? I don't need a bunch of other junk, just the C++ compiler. The goal is to retire my XP system since currently the only reason I keep it is to compile C++ programs that eventually are run under Win7. Thanks, Hotei

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• Restore Default OSX Home Folder Icons

  - by Cerales

  I want to keep folders such as Pictures and Documents in my home folder in sync between computers; at the moment, I'm using Dropbox to do this. On Computer A I added a symlink to the folders in my home directory to the Dropbox folder. On Computer B I deleted the existing Pictures and Documents folders and replaced them with symlinks to the folders in the Dropbox folder. This works very well, except that in Finder I don't see the nice little icons that Lion has by default for folders of a particular kind. Is there any way to restore these?

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• I thought the mac mini server also serves as a wifi router?

  - by erotsppa

  I just bought a snow leopard mac mini server, everything came as a bundle pretty nice. The snow leopard server software preinstalled on the mac mini too. Only thing I'm not sure about is does this also act as a wifi router? In the back of the box it says "airport extreme wireless networking included", I assumed this means that this can act as a wifi router like an aiport extreme? Is this true? If so, how do I do it?

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• Seamless Remote Windows on Linux Client

  - by prestomation

  I really like the RemoteApp features of Windows Server 2008 Are there any solutions for similar functionality for Linux clients and a Windows server? We have users that are running Linux on the desktop and rdesktop to a Windows server, mostly for Outlook. It would be nice if Outlook could behave more seamlessly. From what I can tell rdesktop doesn't do that yet, it only implements RDP 5. I've also seen "SeamlessRDP" from Cendio, which is an extension to rdesktop, but I can't get it to work. I think it doesn't work in Vista, but that is just a guess. Any ideas? And thanks in advance. EDIT: I emailed Cendio and they confirmed SeamlessRDP doesn't work with Server 2008 for unknown reasons. It appears there is no way to do this with a 2k8 server. It's either windows clients with RemoteApp or using a pre-Vista OS with seamlessrdp

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