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• What would be the best way to correlate logs and events on several hosts?

  - by user220746

  I'm trying to build a log correlation system on multiple hosts. SEC seems interesting but I don't know if it will cover my needs. How could I correlate system events, logs, network events, etc. on multiple hosts at the same time, in real time? Examples: If 5 failed logins happened on host A the last minute and if firewall B has denied lots of access on differents ports on A, then we assume there is a potential attack in progress on A. If the Apache service on host A didn't receive any request for the last N minutes and Apache service on host B did, then the load balancing could be faulty.

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• Successful su for user by root in /var/log/auth.log

  - by grs

  I have this sorts of entries in my /var/log/auth.log: Apr 3 12:32:23 machine_name su[1521]: Successful su for user1 by root Apr 3 12:32:23 machine_name su[1654]: Successful su for user2 by root Apr 3 12:32:24 machine_name su[1772]: Successful su for user3 by root Situation: All users are real accounts in /etc/passwd; None of the users has its own crontab; All of those users are logged in the machine some time ago via SSH or No Machine - time varies from few minutes to few hours; no cron jobs are scheduled to run at that time, anacron is removed; I can see similar entries for other days and other times. The common part is the users are logged in when it appears. It does not appear during login, but some time afterwards. This machine has similar setup with few others but it is the only one where I see these entries. What causes them? Thanks

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• How to integrate monit into web app deployment process

  - by shabunc

  I have: Tomcat with webapp deployed via mvn tomcat:redeploy. Monit, pinging the host and restarting server if ping failed. The thing is there in a moment during the redeployment when ping will fail - and this is normal, actually. So, the question is - what is the best way to teach monit to consider the fact of redeployment and not to confuse it with "real" black outs. This is of course an issue of balance between elegance, ease of implementation and scalability. The most straightforward solution I can think of - is just to shutdown monit before deployment and start it up after once again. But this if far from elegance I guess.

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• Automation Question using VMWare Workstation

  - by James K

  I'm running an experiment that requires me to create 100 instances of Windows XP w/SP3 and saving each VM instance off to a hard drive. I have to annotate the time that the VM load starts (starting my timer when I see the "Setup is preparing...") until the load ends when I see the final desktop after VM loads its drivers. I also have to annotate the host start and stop time. Is there any way this process can be automated? Each load runs me about 16:00 minutes and gets real tiresome after a time. BTW... Exact timing is not necessary, eyeballing as described above is sufficient for my testing needs.

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• Is there any software or hardware which lets you stop, slow down, speed up or even reverse time?

  - by tjrobinson

  Obviously I'm talking about time in terms of the PC clock rather than real time. We were testing an application we've developed at work by setting the clock forward and back to simulate different scenarios and I started thinking how useful it would be if you could adjust the rate(?) of the system clock with finer control. So you could make a minute pass in a second or a day pass in 30 seconds and watch how the program you're developing copes with changes in date and time. I'd be interested to hear if anyone knows of any software or hardware which can let you do some or all of the above.

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• Identify Long Running or Slow PHP Scripts

  - by Kirk

  I have web server that is getting around 25K visits a day up at yougetsignal.com. Sometimes the site feels a bit sluggish. I am hosting it on nginx with php5-fpm. Is there a way for me to see a list of all of the long running requests that are coming to the site? I'd love to have a real-time list of all of the active requests that PHP is handling and how long they have been running. Kind of like top, but just for the web server. This would let me know how long requests are taking and which script is the culprit. Anyone have any ideas on how I can do this?

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• Gmail exchange settings for desktop mail clients?

  - by Abhishek

  So I have an ipad, and I have my gmail account there configured via Microsoft Exchange... I don't know a lot about the underlying technologies, but using exchange is mind blowingly awesome... I mean, I receive mail INSTANTLY, and to be able to sync things like my calendars and my contacts at the same time, its just amazing... So enough gloating, and onwards to the real problem... How do I do the same thing on my Mac? Any email client will do... I've tried both, the built in Mac Mail (4.5) app, as well as Outlook for Mac 2011... And I can't get it to work on either...

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• Is there still a place for tape storage?

  - by Jon Ericson

  We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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• HDFS datanode startup fails when disks are full

  - by mbac

  Our HDFS cluster is only 90% full but some datanodes have some disks that are 100% full. That means when we mass reboot the entire cluster some datanodes completely fail to start with a message like this: 2013-10-26 03:58:27,295 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Mkdirs failed to create /mnt/local/sda1/hadoop/dfsdata/blocksBeingWritten Only three have to fail this way before we start experiencing real data loss. Currently we workaround it by decreasing the amount of space reserved for the root user but we'll eventually run out. We also run the re-balancer pretty much constantly, but some disks stay stuck at 100% anyway. Changing the dfs.datanode.failed.volumes.tolerated setting is not the solution as the volume has not failed. Any ideas?

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• how to create stub DNS zone for emulating my customer production environment ?

  - by Albert Widjaja

  Hi All, Is it possible to emulate my customer production environment inside my AD domain by just creating the same domain inside my primary DNS server ? Can I created mycustomer.com DNS zone (STUB) just for the sake of listing few database servers and application servers and then for the other DNS records eg. MX, NS and the other refer to the REAL MX record entry so that my Exchange Server email flow is unaffected to mycustomer.com ? because if I just create A record in my current domain for some of the servers, the FQDN is not exactly what I want. Thanks.

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• USB webcam detected in KVM, but doesn't work

  - by Gene Vincent

  I have installed XP in a virtual machine running on Linux with QEMU/KVM (qemu-kvm-0.11.0-4.5.2). I export my Linux webcam to KVM using the switches "-usb -usbdevice host:046d:0929". The XP guest sees the webcam and the drivers install, but the camera only shows a black image. When I open the camera in Windows Explorer, it says "0 images" and a black image, while on a real XP, it says "1 image" and shows the video from the camera. I tried the same with a different webcam, but the result is the same. Any ideas what might be wrong or how I could debug this ?

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• How to reliably synchronise file servers between London and Shanghai?

  - by Andy S

  We have two offices, one in London and one in Shanghai, each needing to be able to access the same set of files. This means we need a solid, speedy means of synchronising a set of folders between servers at either office. They're likely to be Windows servers, but we could look at Linux boxes if the software side makes more sense on *nix. We've considered Rsync, Unison, Gluster, and a few other options, but none of them seem capable of reliably keeping the servers in sync between such distant office locations. Each office is on DSL connectivity over the open internet, so encryption is also a factor. Does anyone have any hints for getting the servers synchronising in as close to real time as possible, without dying constantly? Andy

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• SQL Server 2008 Log-shipping: Without a UNC drive: how?

  - by samsmith

  My real question here is... is there a tool I can use? (E.g. I have a lot to do, and would prefer not to script it all up myself!) Anyone using the redgate (hmmm, they had a tool for this, but I do not see it on their web site now...) I have a primary web app at rackspace. Am setting up a backup copy of the app in another data center. I want to use SQL log replication to sync the db. Using SQL Server Web Edition. TIA for suggestions and insight!

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• Suspected power supply issue? PC repeatedly whirs for some seconds and then dies.

  - by benwebdev

  I've come home today and switched on the PC I've built a few months ago only for the machine to whir for a few short seconds and then die. It repeats this until I disconnect the power lead. Nothing is output to the screen and this cut out happens very quickly after switching it on. What could this be and how could it be fixed? Is it the power supply? I'm in despair :-( My spec is below, everything is new and was bought and assembled within the last 6months, system has been fantastic until now. Power Supply: 620W CoolerMaster Real Power M620 Motherboard: Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Processor: Intel Core i7 930 2.80GHz @ 4.00GHz RAM: 6GB DDR3 OS Windows 7 64bit Sapphire HD 5770 Vapor-X 1GB Graphics card 1TB Hitachi HDD 720GB Seagate Barracuda HDD 350GB Seagate Barracuda HDD EMu 0404 PCI Soundcard D-Link PCI-E wireless card Samsung DVD RW drive

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• Confirm that two filesystems are identical, ignoring special files

  - by endolith

  /media/A and /media/B should be identical, but I want to confirm before deleting one. Duplicate file finders don't work, because they'll find two copies of the same file within B, for instance. I only want to confirm that every file in one is identical to the other. diff -qr /media/A/ /media/B/ seems to work, but the output is cluttered with garbage like diff: /media/A//etc/alternatives/ControlPanel: No such file or directory and File /media/A//dev/tty8 is a character special file while file /media/B//dev/tty8 is a character special file I can suppress the former with 2> /dev/null, but I don't know about the latter. rsync -avn /media/A/ /media/B/ also produces a bunch of clutter, like "skipping non-regular file". How can I compare the two trees and just make sure that all the real files exist in both and are identical?

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• Cloning a Windows server with VMWare ESXi without domain membership conflicts

  - by Brad

  We are using VMWare ESXi 3.5, and have found it quite useful for cloning a live server to then use the virtualized version to test/practice software upgrades. The trouble is, when the virtualized version fires up, it registers itself on our domain (Active Directory), causing the original server to no longer be accessible via Windows shares. The fix is to remove the virtualized version from the domain, configuring it to use a workgroup instead, deleting the Computer account in AD, and then removing the real server from the domain and re-adding it. Is there a better procedure? Note, we cannot simply disconnect the virtual network from the virtualized server, as it needs to be connected to the network to actually be removed from the domain.

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• IE8/IE7/IE6/IE5 on WinXP Use The Wrong Certificate

  - by Marco Calì

  For some reason IE8/IE7/IE6/IE5 on Windows XP, instead to use the certificate that is listed on the nginx website config, is using another certificate that is used from other websites. Checking the nging config file for the website everything is fine. A confirm of this is that all the other browsers (Chrome/Firefox/Safari/IE9) are using the correct certificate. This is the nginx configuration for the app: server { listen 80; listen 443 ssl; server_name mydomain.com; ssl_certificate /root/certs/mydomain.com/mydomain.bundle.crt; ssl_certificate_key /root/certs/mydomain.com/mydoamin.key; access_log /opt/webapps/cs_at/logs/access.log; location / { add_header P3P 'CP="CAO PSA OUR"'; proxy_pass http://127.0.0.1:20004; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header X-Real-IP $remote_addr; } }

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• nginx automatic failover load balancing

  - by robinmag

  Hi, I'm using nginx and NginxHttpUpstreamModule for loadbalancing. My config is very simple: upstream lb { server 127.0.0.1:8081; server 127.0.0.1:8082; } server { listen 89; server_name localhost; location / { proxy_pass http://lb; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } But with this config, when one of 2 backend server is down, nginx still routes request to it and it results in timeout half of the time :( Is there any solution to make nginx to automatically route the request to another server when it detects a downed server. Thank you.

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• Automatic driver search & update on Windows?

  - by Ben

  I have a Dell laptop issued by my employer, and I always find it a real pain to search for, download and maintain their drivers. It baffles me that there does not seem to be a nice way (product, website, ...) to just download the stuff you need, without hassle. The same goes for the other Windows based laptops in my direct environment. Are there any (preferably free) automated solutions available? Or do you have a nice workflow - other than searching the manufacturers website - to help smoothing this process?

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• ubuntu Grub boot hangs on external usb drive

  - by schoetbi

  Hi, i just gave xubuntu another try and installed it ordinarily on a external usb harddisk. I have another harddisk installed inside the laptop that has Windows Xp on it. Now the problem: When I boot from the external drive the boot menu of Grub 2 shows up and i see all installed bootable partitions including windows. Now I select Xubuntu and wait. When the Xubuntu Logo shows up the boot process hangs. Now the funny thing. When the logo shows up I can unplug the usb drive and reconnect it real fast. Then the boot process will continue!!! Since I am a Linux newbie I would appreciate every hint that can solve this so that I can enjoy a smooth Linux boot:-) EDIT Grub version is: tobias@ubuntu:~$ grub-install -v grub-install (GRUB) 1.98+20100804-5ubuntu3 Kernel is: tobias@ubuntu:~$ uname -r 2.6.35-23-generic Xubuntu is 9.10 Thanks

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• Windows 7 automatically rearranges the start menu

  - by Brice

  I've seen so many messages on how to rearrange the Windows Start Menu and none mentioning the real problem in doing so which has been around since XP at least. I go to ProgramData/Microsoft/Windows/Start Menu and have a day making everything the way I want. For one thing, their Maintenance menu, the Accessories menu and the Administrative Tools menu, I like to put under a Tools folder that I've created. And they seem to move OK. However, within a few hours, I see some of the shortcuts have been moved back or copied back and a new copy of these folders suddenly appears again on my Start Menu at the root. This is maddening and no one seems to even notice in all the tutorials I've read. Anyone know how to change this behavior?

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• USB webcam detected in KVM, but doesn't work

  - by Gene Vincent

  I have installed XP in a virtual machine running on Linux with QEMU/KVM (qemu-kvm-0.11.0-4.5.2). I export my Linux webcam to KVM using the switches "-usb -usbdevice host:046d:0929". The XP guest sees the webcam and the drivers install, but the camera only shows a black image. When I open the camera in Windows Explorer, it says "0 images" and a black image, while on a real XP, it says "1 image" and shows the video from the camera. I tried the same with a different webcam, but the result is the same. Any ideas what might be wrong or how I could debug this ?

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• How can I install Gentoo on Virtual Box//(Ubuntu 12.04)

  - by Curious Apprentice

  I'm googling for a while about how can I install Gentoo on Virtual Box. The hand book provides less information about installing it on virtual box rather on a real partition. I thought there will be a GUI tool to install Gentoo. [Now I think there is not :(] Whenever I'm booting into gentoo Im going into a LiveDVD environment where fdisk returning "command not found !" (Not sure this is a bug or Im using a wronng command) Now Im not a very exprienced user but do like to learn and play with Gentoo. Any help link will be appriciated. Downloaded File: livedvd-x86-amd64-32ul-2012.iso (Do I need to use Gentoo 64 as OS version in Virtual Box ?)

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• Average mail quota usage: tricks to implement unlimited email quota.

  - by Marco Demaio

  I suppose that hosters who provides unlimited mail quota are only claiming it unlimited, and hope that they won't run out of disk space. Correct me if I'm wrong. In order to do such trick they will have probably to calculate the average real quota used by the average user. Let's say on a 100 GB space hosting I offer to 20 x 1GB emails, obviously if all user fill their mail my server would stop working cause they would require 200 GB, but I think I can expect this trick to work cause it will never happen (or it's extermly unprobable) that all user fills up all their mails. But the QUESTTIONS are: What's the average email usage? Can we say that a user normally fills up 1/2 or 1/3 of the quota you provide him? Thanks to any answers/suggetions you might provide.

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• Is it possible to code on two different computers simultaneously?

  - by Muhammad

  I want to work with another programmer and I want the source code to be live in real-time on both of our screens. Is this possible on the Mac OS x or Linux? We're going to be using OS X but occasionally we might need to add an Ubuntu computer too. Is there a way I can do this using ssh, any shell based program, or even a good GUI? I thought Coda might be capable of this but it's not really working. Anyone ever do this? I'm not look for a git/svn/or any other version control system. This is more of a live coding session. :)

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