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• Mikrotik queues and limiting total upstream bandwidth

  - by g18c

  With a Mikrotik router (form of embedded Linux) I have created simple queues per machine matched by source IP address. Each of the 4 machine queues has an unlimited burst 3Mbps/3Mbps for Tx/Rx. During speedtest.net on all 4 machines at the same time, each machine shows 3Mbps (and is limited correctly there), however the total bandwidth on the uplink goes to 12Mbps (i need to set this to 10Mbps max for the upstream). I want to restrict the actual traffic passing across the uplink port to 10Mbps regardless of what the other queues are doing (I need this catch all queue to have the final say on the uplink speed). For example I need: Scenario A Machine A transferring @ 3Mbps Machine B transferring @ 3Mbps Machine C transferring @ 3Mbps Machine D transferring @ 0Mbps Up-link speed = 9Mbps Scenario B Machine A trying to transfer @ 3Mbps Machine B trying to transfer @ 3Mbps Machine C trying to transfer @ 3Mbps Machine D trying to transfer @ 3Mbps Up-link speed = 10Mbps Actual transfer speed of machine A,B,C,D = 2.5Mbps This is to allow slight over subscription of bandwidth queues as not all will be transmitting at 3Mbps all the time. Is this possible and if so how would one go about doing this?

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• Instructions to setup domain controller

  - by Robert Koritnik

  Where could I get best step by step instructions (with some simple explanations) how to setup domain controller on Windows Server 2008 R2 Server Core? I don't know what do I need? Do I need DNS as well and AD and so on and so forth. I don't know enough about these things, but I need to set them up to prepare development environment. I would also like to know how to configure firewall on DC machine, to make it visible on other machines because I've setup DC somehow but I can't connect to it... This is my HW config: Linksys internet router with DHCP my dev machine is Windows 7 my DC machine is a VM in my dev machine my dev machine has a network adapter to linksys and a virtual adapter to DC DC machine has two network adapters: one to linksys (to be inetrnet connected) and one to host (my dev Win7 machine)

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• Benefits of log rotation

  - by Manfred Moser

  I have been using logrotation for years and never thought too much of it being a problem until I came across a question on stackoverflow (http://stackoverflow.com/questions/1508734/disable-java-log-rotation/) where someone wants to disable log rotation. To me with experience in having build server and even production servers cleaned up manually because logs are not rotated and discs are running out and suddenly machines come to a halt that all seems crazy, but it occurred to me that maybe it is not so obvious after all. So what are the benefits of log rotation? And what are the drawbacks (e.g. more difficult to debug/analyze maybe)? What tools do you find useful for working with rotated log files? Splunk I assume, but what else?

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• Delete temporary files from batch script in xp

  - by Keith Bentrup

  I'm looking for a good batch script that would quickly find & clean all the known safe temporary folders/files from Windows (as many variants as possible) machines (e.g. the windows temp folder, all users IE temp folders, etc.). I'm fond of UI tools like CCleaner (over Cleanmgr.exe), but when I'm trying to clean several computers quickly and/or with minimal involvement, it would be nice to have a script. Plus with a script, I could chain several scripts together. Maybe one to then fire up various antivirus and/or malware detectors. Anyone have a good one or can point to a good resource?

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• Subdomain only accessible from one computer

  - by Edan Maor

  I recently added a wildcard A record to my domain (*.root.com), mapping it to a certain elastic ip on AWS. I've configured apache to redirect all references to something.root.com to root.com, except for one specific "dev" subdomain, which is hosting its own site (a Django app, specifically). The Problem: This setup works perfectly for me on my computer. But on other computers around the office, it doesn't seem to work. Specifically, trying to visit dev.root.com gives an "unable to find server" error. Pinging dev.root.com gives a "cannot resolve hostname" error. The weird thing: pinging any other subdomain of root.com does work, from all machines. I would think this was all due to DNS propagation, except all the computers are behind the same office router, so how could that be the case? Any ideas?

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• Easy way to update apache on a server cluster with shared NFS conf?

  - by Simon

  we have a server setup where a server cluster connected with a db/files/conf server shared by nfs serve our sites, behind an Elastic Load Balancer at Amazon EC2. The setup works correctly, but keeping it up to date is becoming like hell, because the apache/php conf that webservers use is shared through NFS. So, if we try to run an apt-get upgrade on a server on the cluster, it will abort it due to the webserver is not able to write back the configuration to the nfs server. Every time we want to update the machines, or install a package like php-curl, we need to create a new ami, so the changes will reflect on the new launched amis. Could it be another way of doing the things simpler? Thanks in advance!

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• ntbackup workalike for adhoc full backups in Windows 7 thats free and preferably open source

  - by Justin Dearing

  On windows 2000 and XP machines I used to be able to do the following: ntbackup backup systemstate c: /f e:\backups\machineName\machineName-full+systemstate_200101206.bkf This gave me a full backup of the system that I could use to do a system restore, after doing a barebones OS install. Windows 7 has a great utility for regular backups with alerting and all that stuff. It does not seem to have command line support. I'd like a backup solution for my Windwos 7 systems that has the following features: Is free Is open source (preferebly) Works while the system is booted and leaves the system functional (clonezilla is great for offline backups, and I use that too) Gives me a backup that is suited for a full system restore or partial system restore (ruling out most imaging software even if they could work while the system is booted via some sort of shadow copy voodoo) Can work via the command line Compression would be nice, the ability to pipe output would be better.

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• Recommended SMTP Relay Service [closed]

  - by Ryan

  I've got a legacy application that needs an smtp server to relay emails. Each client has various control over their IT infrastructures (from little to none at all), so I can't necessarily install an smtp server on each of their machines. Can anyone recommend a basic SMTP Relay Service? Its literally only for sending a couple of emails a day to a list of about 20 users per client. The application only allows for the smtp server and to/from addresses to be specified. I'm assuming its using the default port. Thanks!

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• Remote desktop connection drops before login can appear

  - by Keatly

  Hi Everyone, Someone asked this question a few months ago and I have the exact same problem. I have tried all of the suggested solutions in the other posting (in particular reinstalling the video card on the server), but have not had any luck. I have gone through this troubleshooting guide in detail with no results: http://theillustratednetwork.mvps.org/RemoteDesktop/RemoteDesktopSetupandTroubleshooting.html I have a client with Remote Desktop enabled that I can't connect to in our local network. When I enter in the machine ip/port in the connect box and hit Connect, it briefly gives the normal "Connecting..." dialog box. However, after 2 seconds it just drops. No error message, nothing. Just disappears as if nothing was happening. •Windows XP SP3 •Windows firewall is open for 3389TCP •Machine is on a domain •RDP is enabled in My Computer •User is a local admin I have loads of other machines on the same domain with the same GPO that work fine. Any ideas?

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• Single hardware unit to protect web servers and implement smart publishing

  - by Maxim V. Pavlov

  Thus far we've been using the combination of Forefront TMG 2010 as an edge firewall + intrusion prevention system + web site publishing mechanism in the data center to work with a few web server machines. Since we develop on ASP.NET, we are IIS and in general - Microsoft crowd. Since TMG is being deprecated, we need to come up with a hardware alternative to protect and serve our data center web cloud. Could you please advise a hardware or virtual appliance solution that can provide routing, flood prevention and smart web-site publishing (one IP - many web sites based on domain name filter) all in one. Even if it is hard to configure, as long as it covers all these features, we will invest to learn and replace TMG eventually.

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• Best Guest OS for running freeswitch under Proxmox

  - by Frank Waller

  We have a lot of asterisk Systems running on dedicated machines and would like to use freeswitch to replace a number of them. One of the advantages of freeswitch is supposed to be that it is doing much better in a virtualized environment than asterisk is. However I can find very little information about people using it in Proxmox containers. I would like to know if anyone has seen any ready to run proxmox images that include freeswitch so we can test a number of things without having to deeply go into creating our own. Or at least a clue to which system images/distro images we can use to quickly get it installed not having to deal with too many dependency or different Linux version issues. Just to be clear: It should be for a more or less current Proxmox and current freeswitch. I am not looking forward to use the KVM mode but would consider it, if it is otherwise ready to run out of the box. I would rather use a real OpenVZ based container. Thanks for anyone helping!

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• Why my dns server ip got blacklisted instead of my email server ip?

  - by Khurram Masood

  We are hosting our own dns server our scenario is as under; dns ip: a.b.c.1 fqdn:ns1.example.com ------ reverse lookup to a.b.c.1 mail server ip a.b.c.2 mail.example.com ------ reverse lookup to a.b.c.2 smtp.example.com ------ no reverse lookup pop.example.com ------ no reverse lookup web server ip a.b.c.3 example.com ------ reverse lookup to a.b.c.3 www.example.com ------ no reverse lookup a few days back our dns server ip got blacklisted and all our services were down from outside. We had also added a new dns server on a separate network that caused our domain and machines with same names as above to resolve on different ips, can this b a cause of being blacklisted? But all blacklists points towards spamming. Can anyone please explain why my dns ip got blacklisted instead of my email or web server ip?

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• linux/solaris kill many proccess with one command

  - by yael

  Is it possible to kill all find process with one command? I do not want to kill each process as kill -9 25295 , kill -9 11994 , etc.. Rather, what I want is a simple way or command that kill all find process (my target is to perfrom this action on linux and solaris machines). $ ps -ef | grep find root 25295 25290 0 08:59:59 pts/1 0:01 find /etc -type f -exec grep -l 100.106.23.152 {} ; -print root 11994 26144 0 09:04:18 pts/1 0:00 find /etc -type f -exec grep -l 100.106.23.153 {} ; -print root 25366 25356 0 08:59:59 pts/1 0:01 find /etc -type f -exec grep -l 100.106.23.154 {} ; -print root 26703 26658 0 09:00:05 pts/1 0:01 find /etc -type f -exec grep -l 100.106.23.155 {} ; -print

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• Restarting rsyslog re-sends logs again

  - by Jay Taylor

  I am running Ubuntu 12.04.1 LTS on EC2. I have a bunch of application servers which are configured to forward their logs to a central server via rsyslog. Since putting in Nagios monitoring on the log files on the central server, I've been getting alerts indicating that particular application servers are failing to forward their logs to the centralized server. Logging into the machines and restarting the rsyslog service fixes the problem. However, rsyslog then re-transmits the logs again, resulting in duplicates on the collector. Why is it doing this?

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• Linux IPv6: DHCP and /127 prefixes

  - by Jeff Ferland

  I've tried multiple pieces of DHCP client and software in attempting to setup a solution for allocating a /127 prefix to virtual machines so that each maintains its own layer 2 isolation. Because there would only be one host assigned to each network, a /64 is impractical. While the prefix size could reasonably be somewhere in the /64-127 range, the crux of the problem has been the same regardless of the software used in configuring: the DHCP call to bring up the interface uses the address advertised by DHCPv6 and inserts two routes: the /127 given by the router advertising packets and a /64 as well. Any thoughts on why I'm getting the additional route added across dhcp client vendors?

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• Import virtualBox appliance to KVM

  - by Hugo Bulnes

  Im new using KVM as a virtualization solution. Currently I'm using VirtualBox to manage my virtual machines in my personal computer, but I'm moving my virtualization to a Server, so I set up a Linux server with KVM. And now I'm trying to import a virtualBox vm to KVM. So far I couldn't make it work. I already convert the ova file from VirtualBox to a format more familiar to KVM (qcow2), and I try to create a new virtual machine using virt-install command and setting the new virtual machine hard drive with the .qcow2 file. There is anyone could help me? thank you!

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• Why is idle windows VM using so much CPU?

  - by Jeff Shattock

  I have 2 VMs running as guests on a KVM virtualization platform running on Ubuntu 10.04. One VM is an Ubuntu 10.04 system, the other is a Windows 7 system. When both machines are completely logged out, the Linux machine uses 1% CPU, the Windows one 45-50%, according to top. The graphs in virt-manager seem to back this up. Theres nothing installed on the Win7 image that would be running in the background; its as fresh as can be. Why is the Windows VM using so much more than the Linux VM, when both are logged out and idling?

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• Options for transparent data encryption on SQL 2005 and 2008 DBs.

  - by Dan

  Recently, in Massachusetts a law was passed (rather silently) that data containing personally identifiable information, must be encrypted. PII is defined by the state, as containing the residents first and last name, in combination with either, A. SSN B. drivers license or ID card # C. Debit or CC # Due to the nature of the software we make, all of our clients use SQL as the backend. Typically servers will be running SQl2005 Standard or above, sometimes SQL 2008. Almost all client machines use SQL2005 Express. We use replication between client and server. Unfortunately, to get TDE you need to have SQL Enterprise on each machine, which is absolutely not an option. I'm looking for recommendations of products that will encrypt a DB. Right now, I'm not interested in whole disk encryption at all.

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• Sharing VPN from XP to Linux virtual

  - by user55513

  Hi I will keep the question simple with few details, if more is needed tell me. Thanks. I am playing around with networking and virtualbox. So I have 2 virtual machines. One is windows xp and another has linux in it. Windows XP has 2 network cards. One for the internet and the other to connect to the linux computer. Linux has one 1 card and it can only access the internet passing through Windows XP. Internet works fine until I activate OpenVPN on Windows. When I turn on VPN, Linux has no access to it. How can I make linux use VPN too? I believe it has something to do with using the "route" command on XP to send VPN traffic to Linux but I was not able to figure it out how yet.

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• See network computer description in Explorer

  - by John Gardeniers

  When viewing the list of network computers in Windows Explorer on a Win 7 machine there appears to be no way of readily seeing the description field, which makes that pretty well useless. I believe this problem started with Vista but I'm seeing it for the first time because I was fortunate enough to skip over Vista. We're currently rolling out Win 7 on new boxes and although I'm changing the naming system to something more sensible, the old boxes have names such as FWS01, FWS02, etc. Managing a network of computers with such names is made more difficult when you can't readily see who's machine each one is. Googling the problem brought up a workaround involving creating a shortcut on an XP machine and copying that to the Win 7 box but that's a long way from ideal. Is there some kind of hack that can be applied to machines, the operator of which needs to be able to see the description field?

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• Highly Available Web Application (LAMP)

  - by Anthony Rizzo

  I work for a small company who provides a web application for thousands of users. Earlier this year they had one server hosted one company. We recently acquired another server in a different location with the hopes of one day making this a redundant failover machine. I understand what to do with the mysql replication, I plan on using a master-master replication setup, and rsync to sync the scripts and files, however I am at a stand still about how to configure the fail-over. Ideally I would like the two machines to accept requests, like a round robin dns, however if one machine goes down I do not want requests to go that machine. All of the solutions I am come across assumes high availability of servers in the same location, these servers are in two completely different locations with different public ip address. Any help would be great. Thanks

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• XP can't read data from transferred HD

  - by Alexander Miller

  Computer A, running XP, died. XP was installed on a fresh HD in computer B. Slaved data-backup HD from A was installed as slave on B. B will not read it; shows only 2 folders, Recycler and System Volume Info. All of these are older machines with IDE drives. What's going on & how can I read/transfer the data from the transferred drive? This was only a trial run. Actually I will need to transfer the master HD from A - which has XP on it - and read from its data partition because (blush) the backup drive was not up to date.

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• tail -f updates slowly

  - by Cliff

  I'm not sure why, but on my Macbook Pro running lion I get slow updates when I issue "tail -f" on a log file that is being written to. I used to use this command all the time at my last company but that was typically on Linux machines. The only thing I can think of that would possibly slow the updates are buffering of output and/or maybe a different update interval on a Mac vs. Linux. I've tried with several commands all which write to stout relatively quickly but give slow updates to the tail command. Any ideas? Update I am merely running a python script with a bunch of prints in it and redirecting to a file vi " my output.log". I expect to see updates near real time but that doesn't seem to be the case.

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• How to push to github from a server account with multiple users?

  - by kirdie

  We have a web server which contains a web application stored as a github project. Now all of us can push from our local machines to github and then pull on the server but sometimes we want to make small changes and immediately see the effect so it would be great to be able to push at the server too. Now I created an ssh key for the server but I don't want to add the servers ssh key to my github account because then all github actions done from the server are counted to my account. Is it possible to add the ssh key to the github web application project without creating a new user for the server and what is the best practice for this situation? I also don't want to copy my private key to the server obviously.

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• OpenLdap 2.4 on centos 6 doesn't listen on port 636

  - by Oliver Henriot

  I have an openldap 2.4 server on centos 6 whose confg I copied from those I have running under openldap 2.3 servers on centos 5 machines. On openldap 2.3, specifying TLSCACertificateFile, TLSCertificateFile and TLSCertificateKeyFile with correct values makes the server listen on port 636. This is not the case on the openldap 2.4 setup. I have configured it with loglevel -1 but I have not seen any clue as to what might be wrong and reading the openldap 2.4 manual doesn't indicate if any of the other TLS related parameters are now mandatory. I don't think so though because if I run the service manually, using "# /usr/sbin/slapd -u ldap -h "ldap:/// ldaps:/// ldapi:///"", the server does listen on port 636 and I can query it using "ldapsearch -H ldaps://myserver:636". Is there something I am missing to get the server to listen on port 636 without having to always launch it manually? Is this linked to centos 6 or openldap 2.4? Thank you. Cheers,

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