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• VPN/AFP server for centralized TimeMachine backups

  - by Keith Johnson

  I am a sysadmin for a small group of about 7 people who prefer Apple machines for their work. These machines are currently either a) not backed up at all, or b) backed up using Retrospect(Which I'm not very fond of). I don't really have the budget for anything fancy, and I'd like to keep it as user friendly as possible. Ideally I am thinking of a VPN server they can connect to(to keep the traffic secure, and because they work from home frequently) along with an AFP server for use with TimeMachine. The goal would be to get better backup coverage, along with user-initiated restores and overall ease of use. Does this seem like a reasonable idea? Has anyone done this before? Are there any obvious problems I've overlooked?

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• Best way to duplicate databases nightly?

  - by Margaret

  Hey all We just got two new servers, that are running Windows Server 2008. The intent is to make the machines pretty much identical, copying the content of the master to the slave on a nightly basis, so that if anything fails, the second copy can stand in immediately. It doesn't need to be up-to-the-minute mirroring, though I suppose that wouldn't hurt if performance is not affected. The two machines will, amongst other things, each be running an instance of SQL Server 2008. The aim is to duplicate the databases on the master down to the slave on a nightly basis. Unless I'm misunderstanding, the slave databases in mirrored databases require the primary to be present to work correctly; I'm hoping for some solution where we have a second machine that can be up and running with minimal downtime if the first one falls over. Am I misunderstanding mirroring? Is that the best way to do things, or should I use some other mechanism? If so, what?

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• Snow Leopard: Optimization

  - by Shyam

  Hi, I have bunch of questions: I have a Mac network, which has five Mac's. Right now, they are individually getting software updates. Is there a way to download the patches/security updates in a single place (repository) and point all machines to this location? Personally, I have tools like Monolingual and Onyx, but are there tools you could recommend that affect the performance of the Operating System positively? Tweaks would be nice. Links and pointers, would be really appreciated. I've read about Time machine, is there a way to backup all machines to a network drive using this tool? Thanks!

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• How do diff over ssh?

  - by Alexey Timanovsky

  How do I diff files/folders across machines provided that the only connectivity available is ssh?

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• Combined states, FSM

  - by bobobobo

  Not sure this is the right place to ask, but is it "correct" to combine states of an FSM? Say you have an object with enum State { State1 = 1 << 0, State2 = 1 << 1, State3 = 1 << 2 } ; It just so happens that it makes sense to combine states, as in State myState = State1 | State2 ; however in FSM theory is this illegal?

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• High Availability ASP.Net MVC

  - by user360730

  When building an ASP.NET MVC application with High Availability is it best practice to keep the session state on the SQL Server, if there is no state server available?

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• Replacing a W2K3 Domain Controller - what do I need to know?

  - by Marko Carter

  I have a network of around 70 machines, currently with two DCs both running Windows Server 2003 (DC0 & DC1). DC0 is a five year old Poweredge 1850 and has recently become increasingly flakey, and in the past fortnight has fallen over twice. I want to replace this machine, but I'm cautious as there is huge scope for this sort of thing to go wrong. The way I imagine doing this is building a new machine then doing a DCPROMO and running three domain controllers for a month or so until I'm happy that everything is working as it should be before retiring the old machine. Particular areas of concern are the replication of roles from the current controllers (GP settings for instance) and the ramifications of switching off the machine that has, up until now, been the 'primary'. If there are compelling reasons to use Server 2008 I'm willing to do so, however I don't know if this would cause problems with my exisiting 2003 machines. Any advice on best practice or previous experiences would be most welcome.

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• Overcrowded Windows XP Folders

  - by BlairHippo

  I know that, technically, an individual Windows XP directory can hold an immense number of files (over 4.29 billion, according to a quick Google search). However, is there a practical ceiling where too many files in one directory starts having an impact on reads to those files? If so, what factors would exacerbate or help the issue? I ask because my employer has several hundred XP machines in the field at client sites, and the performance on some of the older ones is getting "sludgy." The machines download and display client-defined images, and my supervisor and I suspect that our slacktastic approach to cache management could be to blame. (Some of the directories have tens of thousands of images in them.) I'm trying to gather evidence to support or contest the theory before spending time on a coding fix.

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• Nodes inside Cisco VPN. Incoming SSH requests allowed. But can't initiate an outbound SSH.

  - by Douglas Peter

  I've a gateway-to-gateway VPN setup between my Linksys RV042 router and a Cisco VPN. I am able to SSH into any of the machine inside the VPN from my network. But none of the machines inside the VPN can initiate an SSH into my network. It seems they've blocked even all ping requests to my network gateway. This is the requirement: I have scripts that SSH into the machines inside the VPN and run a long mysql query. The query generates an output to a file. The time that these queries take is variable. So I have a loop in my machine that periodically SSHes into the VPN machine and checks if the query has finished, and pulls the generated file using SCP. I need to simplify it thus: The script will run at the machine inside the VPN, and when the query completes, it will SSH into my machine and pushes the generated file. Thanks for any ideas.

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• Very low throughput on 10GbE network

  - by aix

  I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput between the two machines. On one box, I run: netserver and on the other: netperf -t TCP_STREAM -H 192.168.x.x -- -m 32768 I get: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.x.x (192.168.x.x) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 32768 10.02 1321.34 The measured throughput is 1.3Gb/s. This is 7.5x below the theoretical maximum, and only 30% faster than 1GbE. What steps can I take to troubleshoot this?

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• Preparing computers for remote MSI installation in NT4 domain

  - by user40177

  We recently purchased EMCO Remote Installer to deploy MSI packages we're creating. We are still (unfortunately) in an NT4 domain, and when I try to deploy a package using domain's administrator credentials I'm getting "access denied". Under the "requirements for remote computers" section on the EMCO website (http://www.emco.is/products/remote-installer/requirements.php), it says that it requires remote machines to have: * Started services: Computer Browser, Remote Registry * File and Printer sharing enabled * Windows Installer 3.1 * TCP ports opened: 135, 139, 445 * UDP ports opened: 137, 138 Is there any way of scripting these changes? If so, could someone get me started? I have about 200 machines I need to get this working with. Thanks for all your help!!

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• Is it possible to use the MMM tool without virtual IP capability?

  - by Artem

  We are on a host (Serverbeach) that does not support Virtual/floating IPs until you reserve at least a half-rack, which is just a little more than we are willing to spend per month right now. We do have 2 machines in one of their datacenters, and I am using these 2 machines right now in the Master-Master in Active-Passive Mode just like done by MMM -- http://mysql-mmm.org/. I have just set them up and I managing them manually, with manual switch on the Web frontend to tell it to connect to the correct (active) master. Is there any way to use MMM without virtual IPs? Any other comments on this setup?

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• Strange behavior in networking between 64bit and 32bit

  - by Rob

  I'm having a strange behavior about my network setup. I have 2 laptops, one (Lenovo) with Windows 7 Professional 64-bit and another (Acer) with Windows 7 Ultimate 32-bit and a wireless router. I'm connecting these 2 using the router but with a strange behavior. I can ping both machines, as well as the router, but when i try to access their shared folders (\\computer_name\shared_folder) the connection starts to fail and I need to reboot both machines to get it working again. But this only happens sometimes, sometimes it works.

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• I get an error when implementing tde in SQL Server 2008

  - by mahima

  While using USE mssqltips_tde; CREATE DATABASE ENCRYPTION KEY with ALGORITHM = AES_256 ENCRYPTION BY SERVER CERTIFICATE TDECert GO I'm getting an error Msg 156, Level 15, State 1, Line 2 Incorrect syntax near the keyword 'KEY'. Msg 319, Level 15, State 1, Line 3 Incorrect syntax near the keyword 'with'. If this statement is a common table expression or an xmlnamespaces clause, the previous statement must be terminated with a semicolon. please help in resolving the same as i need to implement Encryption on my DB

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• Simple active directory permissions issue

  - by Antonio2011a

  So I've created a domain controller (DC) as well as 3 machines (SQL-A, SQL-B, SQL-CORE). All are running Windows Server2008R2 (on virtualbox). I have successfully joined the 3 machines to the domain controller. Next I created a user in active directory called Kim_Akers who is a member of "Domain Admins", "Domain users", "Enterprise Admins" and "Schema Admins". However when I login to SQL-A for example as contso/Kim_Akers and then try and run something like the ServerManager.msc I can't do it due to lack of permissions "Windows cannot access the specified device, path or file. You may not have the appropriate permissions". What am I doing wrong that Kim_Akers doesn't have permissions to do this? Thanks.

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• File sharing from a cable connected pc to wifi connected laptop (windows 7 ultimate)

  - by Aiden Jones

  I have a one desktop running windows 7 ultimate connected to Ethernet cable. And I want to share folder to another wifi connected laptop (also windows 7 ultimate). Both machines are on the same home internet connection. I have tried to share folders by going to properties sharing advanced sharing permissions checked all the boxes to allow all but I don’t see any shared files on my laptop. I know it’s possible to share folders between two Wi-Fi connected machines but how can it be done when one pc is cable connected and other is Wi-Fi connected on the same internet connection.

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• Are folders and filenames starting with "icon" illegal in SMB?

  - by dash-tom-bang

  Are five letter filenames starting with "icon" illegal in SMB? I just got a Drobo FS, in part to back up the computers in my house, and it does not accept folders named 'icons', 'iconv', or indeed I tried a bunch of other icon plus one letter names. I got errors on creation of these folders although now I don't remember the exact error. It has been confirmed with Drobo support that they "veto" files and folders named like this, due to them being illegal in the SMB spec. My Google skills so far have not been sufficient to turning any information on this up, however, so I wonder if anyone knows what's up? Sadly I can create these files and folders from my Mac, which I guess connects using AFP? But then I can't see them on my Windows machines. This is of little help if it is my Windows machines that I want to back up, and those being the ones with folders named like this. Thanks.

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• Smoothwall Express interface issues

  - by Timbermar

  I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of .254) has a DHCP server that is pushing addresses from .1 to .100 and the purple interface (.253) is pushing addresses from .101 to .120. Every machine here is trusted, and as such is connected to the green interface via a wired connection or wireless APs. Nothing is connected at all (port is physically empty, traffic graphs show no activity) to the purple interface. However, every machine here is pulling addresses from the purple interface. So the question boils down to, how do I remove/stop my machines from pulling from the purple dhcp interface? Also, shouldn't the purple interface (if we were using it for guest Wifi or something) be on a different subnet (i.e. 192.168.100.0/24 instead of 192.168.1.0/24 with all the trusted machines)?

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• DNS and RPC Unavailable

  - by Berek Bryan

  I have a server that is host a MSSQL database and some other server related tasks. The server communicaties with a large number of devices. The devices send data to the server. The communication links are down between the devices on the intranet and to the outside world. However it seems I can ping and can be pinged from machines on the same switch. This includes the DNS Servers. When I run, C:\ipconfig /registerdns I get RPC Server is Unavailable. So, it seems that the server can not verify the DNS server. Both DNS server are up and running. No other machines are affected on the network.

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• Wcf exception handling

  - by pdiddy

  I noticed that if you do a throw new InvalidCastException for example, the channel state on the client side is faulted. But if you throw new FaultException, the channel state on the client side is opened. By curiosity, what is the reason why one faults the channel and the other doesn't?

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• Simulate Network Presence in dbus

  - by Evans

  Is there a way using Python to simulate the presence of an active network connection using dbus? If I call getstate() on the dbus, I'm able to get the current network state. I want to set the current state to 4 (Connection Present). This is because Network Manager is not able to connect using my modem and I use other tools to connect. Pidgin, Empathy and other software are not able to detect the network.

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• Resize Ubuntu Linux system to smaller disk inside VMware ESXi

  - by mlambie

  I have several Ubuntu Linux virtual machines running on VMware ESXi hosts that have all been allocated disks much larger than their required capacity. As space is now becoming an issue on our SAN, I'd like to investigate downsizing the allocated disk space on these machines. All systems will be completely backed up imaged before I begin making changes, and I will always retain a pristine backup in case the partition resizing does not work. Is there an easier way than the following procedure, or is their a better solution entirely? Shutdown and assign a second disk to the virtual machine Boot using the SystemRescueCD Use GParted to resize the original (source) partition, making it smaller Clone the new, smaller partition to the second disk Shutdown and remove initial disk from the virtual machine Reboot and force fsck to check the filesystem

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• Automating and deploying new linux servers

  - by luckytaxi

  I'm in the process of developing a method to automate new virtual machines into my environment. 90% of our machines are virtual but the process is similar for both physical and vmware based images. What I do now is I use cobbler to install the base OS. The kickstart script has post hooks to modify the yum repo and installs puppet and func. Once the servers are running, I manually add them into nagios and sign the certificate via the puppetmaster. I've since migrated most of the resources to use mysql as the backend. I wanted to see what others are doing and my goal for 2011 is to have puppet inventory the hardware into mysql, and somehow i'll script a python script to have nagios grab the info and automatically add it for monitoring purposes. It's kind of tedious to have to add each new server into nagios, puppet's dashboard, munin, etc...

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• Internet connection very slow after Linksys configuration

  - by NLV

  Hello We have this network setup Server1 - DHCP server, Domain Controller, AD Lease line for Internet connection From lease line to Linksys router (we dont use wireless though) From linksys to Netgear (24 port Switch) and vonage (VoIP) Netgear to all our machines We configured Linsys with the static IP and DNS server addresses our ISP gave and we have routed it correctly. All our work machines are configured with Get IP automatically DNS server addresses our ISP gave The problem is that none of the sites are getting opened promptly. It is taking around 5 minutes to load google.com. But we are able to ping all the sites. What could be the problem?

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• Using a KVM with a Sun Ultra 45

  - by Kit Peters

  I have a friend with two machines: a Mac and a Sun Ultra45. He wants to use a single monitor (connected via DVI) and USB keyboard / mouse with both machines. Try as I might, the Sun box will not bring up a console if the KVM is connected. However, if I connect a monitor, keyboard, and mouse directly to the Sun box, it will bring up a console that I can then (IIRC) connect to the KVM. Is there any way I can make the Sun box always bring up a console, regardless of whether it "sees" a monitor, keyboard, and mouse?

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