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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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• Why can't European users access my site?

  - by japancheese

  Hello, My site has been running just fine for the past couple of years, but all of a sudden, two days ago, European users have been experiencing serious connection problems to the site. I really want to fix this for them, but what's the best way to figure out what the issue is? I have absolutely no connection problems to the site on my end, nor do Asian or other American users it seems. Using just-ping.com, some European servers come back with some packet losses. I tried doing some traceroutes from European servers to my own, but they all seemed to work just fine. I'd at least like to be able to tell users that if the problem does not lie with my server, then it at least lies somewhere out of my control. I really want to figure out what the choke point is though. Is there another way I might be able to find out why they can't seem to connect to the site? Just looking for any other ideas from people that have had a similar experience.

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• website is accessible through dns1. but not with WWW

  - by Pushpendra

  i have a domain and i am using freehostia as a web hoster. In the name server of domain i have registered the name of both servers of freehostia. And in my control panel in the hosted domain section its showing "1 Hosted Domains / 1 Domains Listed".however on clicking on that its showing an error that "The selected domain name has not been registered yet. Please register it from the Domain Manager section first" now whenever i am trying to access my website by using dns1. its accessible but when i am using WWW. its not accessible for example my domain name is example.com if i will type dns1.example.com then my webpage will open but when i type www.example.com its showing "Oops! Google Chrome could not find www.example.com" And for information 24 hours has been passed since i have registered my name servers.

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• china and gmail attachs -

  - by doug

  "We have evidence to suggest that a primary goal of the attackers was accessing the Gmail accounts of Chinese human rights activists. Based on our investigation to date we believe their attack did not achieve that objective. Only two Gmail accounts appear to have been accessed, and that activity was limited to account information (such as the date the account was created) and subject line, rather than the content of emails themselves.” [source] I don't know much about how internet works, but as long the chines gov has access to the chines internet providers servers, why do they need to hack gmail accounts? I assume that i don't understand how submitting/writing a message(from user to gmail servers) works, in order to be sent later to the other email address. Who can tell me how submitting a message to a web form works?

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• IPSec on Domain Controllers and Trusted Domains

  - by OneLogicalMyth

  I am looking at configuring IPSec as follows: Isolation Request authentication for inbound and outbound connections Computer and user (Kerberos V5) I am looking to do a blanket deployment across all servers and domain controllers. Workstations I will leave as not set. What impact in terms of the domain controllers with the 2-way forest trust do think I would see? Should I exclude the IP addresses of the trusted domain controllers? I don't want to stop communication between the current and trusted forest, however I do want IPsec to be used within the current forest on all servers. The trusted forest is running 2008 R2 and the current forest is 2012 R2.

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• How to set up a DNS name server to always resolve to a constant IP address for every request

  - by Andy Higgins

  I am looking for a simple DNS name server set up to always return the same IP address no matter what the request is. The reason for this is we are a domain registrar and when a domain is first registered we need it to have valid name servers (and don't want to have to first create name server records before registering a domain). We will then subsequently change the name server records after the domain has been registered. I assume this is possible to do with bind but was wondering if there might be a simpler solution available using one of the more light weight name servers out there? Any suggestions on how to accomplish this in a simple manner will be appreciated.

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• 504 Gateway Timeout on server clusters

  - by Sixfoot Studio

  Hi All, Here's our scenario: We're running three websites on three web servers hosted on virtual machines running the following: IIS6 Win 2003 Standard Edition Oracle 10g Sitefinity 3.7 We do not have constant control over these servers and something's gone wrong in the interim in that we're getting constant 504 Gateway Timeouts. The other thing that's happening is that if you hit one of the sites, that site is trying to pull themes from one of the sites App_Themes folder in Sitefinity, which of course should not be happening at all. If someone has any ideas on why this should suddenly have started happening I would appreciate it. Many thanks

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• Add multi monitor option to remote desktop web access

  - by Eds

  I have a test environment for a remote desktop farm with a connection broker load balancing logins across remote desktop session host servers. All servers are built on Server 2012 R2. Using rd web access, we can access this farm from anywhere. When logging in via web access, you can choose the screen resolution or use full screen. If you have two monitors when selecting full screen, it will always use both your monitors. Does anyone know how to adjust the RDWeb page so that you can choose whether or not to use both your monitors? This option is in the GUI from RDP 6.1 onwards, so I would imagine there is a way to also add it the web access page.

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• zero downtime during database scheme upgrade on SQL 2008

  - by eject

  I have web application on IIS7 with SQL server 2008 as RDBMS. Need get 0 downtime during future upgrades of ASP.NET code and DB schema as well. I need to get right scenario for this. I have 2 web servers and 2 sql servers and one http load balancer whcih allows to switch web backend server for web requests. Main goal is to make 1st web server and DB server up and running, update code and db schema on 2nd server and then switch all the requests to 2nd server and then main problem - how to copy data from 1st database 2nd (which was changed during upgrade).

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• How to check use of userva boot option on Win 2K3 server

  - by Tim Sylvester

  I have some 32-bit Win2K3 servers running an application that fails now and then apparently due to heap fragmentation. (Process virtual bytes grows, private bytes does not) I do not have access to the source code or build process of this application. I have modified the boot.ini file on one of these servers to include /userva=2560, half way between the normal mode of operation and the /3GB option. Normally it takes weeks to reach the point of failure, but I'd like to see right away whether this has actually had any effect. As I understand it, this option limits the kernel to the remaining address space (1536MB instead of 2048), but does not necessarily give an application the extra address space, depending on the flags in the application's PE header. How can I determine whether the O/S is allowing a particular application, running in production, to access address space above 2GB? Additionally, what's the best way to monitor the system to ensure that the kernel is not starved for address space, and more generally how should I go about finding the optimal value for this setting?

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• Rack Mounting a Server with hot air vents on the top?

  - by Adam

  We just got a couple of HP DL360 G7's, and I notice it has vents on the top. More hot air seems to exit through these vents than it does anywhere on the back. All our servers in the past have always vented all the hot air through the back. How are these servers with top vents supposed to be mounted? Everyone always says airflow is best by not leaving gaps on the rack, but it seems like a server right on top of it would receive a lot of heat.

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• Stop WSUS from rebooting a server

  - by sixlettervariables

  Our IT department is rolling out a set of patches via WSUS this weekend and will reboot all of our Win2k3 servers on Sunday. Due to production work which must continue uninhibited, we cannot allow this reboot to occur. The exact line we have been given is: The command to download the patches and reboot on Sunday has been sent by WSUS already and cannot be taken back. The servers will reboot on Sunday automatically. How can we go about stopping this from happening? It set some flag saying it should reboot, so what flag do we unset? One strategy proposed was to roll back the system clock, however, this will likely cause some processes to fail.

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• Schedled Tasks and Environment Variables

  - by Andrew J. Brehm

  I have a scheduled task, a batch file, that uses an environment variables which is set system-wide. On server 1, the scheduled task runs under a domain account and the environment variable works. The environment variable also exists in my session and when I runas as the service account. On server 2, the scheduled task runs under a different domain account and the environment variable DOES NOT work. However, the environment variable does exist in my session and when I runas as the service account. On both servers the environment variable has been set system-wide by the same script originally. The script runs again every now and then and as far as I can see noone has tempered with the environment variable. The scheduled tasks are set up identically on the two servers (using the same XML file) and the two service accounts are identically configured (as far as I know). What am I doing wrong?

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• Are VLANs necessary for my environment?

  - by kleefaj

  Greetings. I'm the new network manager for a school. I've inherited an environment made up of several Windows servers, about 100 Windows clients, ten printers, one Cisco router, six Cisco switches, and 1 HP switch. Also, we're using VoIP. There are four floors in our building. The hosts on each floor are assigned to a separate VLAN. An office on the first floor has its own VLAN. All the switches are on their own VLAN. The IP phones are on their own VLAN. And the servers are on their own VLAN. For the number of hosts on the network, are all these VLANs really buying me anything? I'm new to the VLAN concept but it seems overly complicated for this environment. Or it's genius and I just don't get it. Any thoughts? Thanks, Jeff

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• Is SSL to the proxy good enough?

  - by Josh Smeaton

  We are currently trying to decide on how best to do SSL traffic in our environment. We have an externally facing Apache proxy server that is responsible for directing all traffic into our environment. It is also doing the SSL work for the majority of our servers. There are one or two IIS servers in particular that are doing their own SSL, but they are also behind the proxy. I'm wondering, is SSL to the proxy good enough? It would mean that traffic within our network is identifiable, but is that such a big deal?

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• What URLs must be in IE's Trusted Sites list to allow Windows Update?

  - by ewall

  Particularly for servers in which IE Enhanced Security Configuration is enabled, you need to have all the Windows Update/Microsoft Update URLs in your "Trusted Sites" list in order to use the site. (Furthermore, for domain member servers where Group Policy enforces Internet Explorer's list of "Trusted Sites", you don't have the option to edit the Trusted Sites yourself... so all the necessary URLs should be listed in the GPO.) So, what is the full list of URLs I'll need in IE's Trusted Sites? So far I have the following: http(s)://*.update.microsoft.com http://download.windowsupdate.com http://windowsupdate.microsoft.com I seem to remember there being several more...

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• Testing a Virtualisation of a Debian Server (vmWare vSphere probably)

  - by xyza

  I'm soon getting access to a powerful root-server (quad-core, 16gb ram, 1gbit connection) where gameservers (like minecraft,counterstrike etc.) for different customers should be setup. My plan is to use programs such as vmWare vSphere to create some virtual machines for each customer. Inside such a virtual machine I'll setup the gameserver and maybe some kind of ftp server when its needed. Now that I'm kinda new to virtualisation of servers I want to test this local on my Desktop Computer. Is it possible to create a virtual machine of debian using vmWare Player on my Windows desktop computer and then install vmware vSphere in this VM to create multiple VM's inside that VM ? Or do I really need to install Debian on my desktop computer. (I want to use the time during installations etc. to work a bit at my windows installation) Some tips on virtualising debian servers are also appreciated :)

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• Distributed Server Monitoring Solution

  - by MaterialEdge

  I belong to an independent IT firm that manages and maintains about 50 business clients networks, ranging from small 5 system networks to 200+ systems. Because we are unable to directly monitor each server at these locations (distributed over a very large area) on a regular basis I am looking for a method to monitor and alert us to any problems that may arise so that we can respond quickly with, hopefully, preventative measures. I'm not sure what solutions are available for this type of situation, but something that utilizes a central server at our business with all client servers sending alerts or logs to it for daily monitoring might work best. All these servers are running a Windows Server OS. In your opinion, what would be the best course of action to accomplish this?

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• How to setup dhcp3-server to advertise the DNS server the server itself has got from DHCP?

  - by Ivan

  The Ubuntu 10.04 server has eth0 Internet interface configured by means of an ISP's DHCP. At the same time the server has static eth0 LAN interface to which it provides masquerading (NAT) and LAN-internal DHCP service (dhcp3-server). As far as I've understood the manual, I had to hardcode DNS servers to advertise through LAN DHCP with option domain-name-servers in dhcpd.conf. But what if the ISP changes his DNS server IP silently (we use a SOHO-class ISP, so this won't surprise me much)? Can I configure dhcpd to advertise the DNS server the server uses itself, the one gotten by its DHCP client mechanism?

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• configuring linux server to send traffic to local machines using local IP address

  - by gkdsp

  Two linux servers, server1 and server2, are on the same local network (they also have access to an external network). Server2 has a local IP of 192.168.0.2 and a host name of host2.mydomain.com. QUESTION 1: If an application on server1 sends traffic to server2 using a host name of host2.mydomain.com, what determines whether this traffic is routed to server2 using the local or external network? QUESTION 2: To ensure that all traffic sent from server1 to server2 always uses the local network, could I simply include in the server1 /etc/hosts file the following? 192.168.0.2 host2.mydomain.com ...the thinking being, if the servers are always on the same network there should never be a need for server2 to send traffic to server1 via the external network (that I can think of anyway). Is this done in practice, or is some other method preferred?

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• Behaviour of nginx as proxy

  - by HD

  I'm testing nginx with different configurations to replace an architecture working with squid + apache. I know that I can use nginx to manage static requests and load balancing but I'm interested in one particular solution that I don't understand clearly: I'm using 2 nginx servers (balanced) with the proxy_pass setting to pass all requests to an apache server. When one client makes a request to the site one of the nginx servers process it and send it to the apache server. Now, how this behaviour could be an improvement to my system?, it seems that all requests are passing through apache and I don't see benefit at all. What happens when 100 simultaneous connections pass through nginx? The 100 connections will be going to the apache server or is some kind of internal behaviour that allows an small impact into apache?

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• Commit charge peak higher than system limit

  - by Grubsnik

  We are seeing some very strange behaviour on our servers and google didn't turn up anything usefull, so I'm tossing it out here. A standard server is configured with 4GB Ram, 2 4GB pagefiles and running windows server 2003. The servers are running 50-120 vb6/.net applications which normally consume no more than 100mb of memory, but will occasionally run up to 300 mb. The issue with a single process spending way too much memory is being traced down somewhere else, but the thing that is baffling us is that the reported peak charge is vastly higher than what we have available. As the image above shows, we are getting reported peaks that are way higher than what the system is actually capable of delivering. This number has been seen as high as 29GB, which makes no sense at all for a system with a limit of 12GB. Does anyone have an idea what is going on?

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• How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

  - by dalej

  We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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• VPN ipsec tunnel from router to single windows server computer (gateway-to-host)

  - by Chris Miller

  Firstly, is this possible? The situation: 2 different ISP's. One has several servers and a firewall running. The other is limited to only one virtual server with one network card running windows server 2008r2. I need to set up a site-to-site style VPN using IPsec between the firewall of one ISP and the windows host on the other (gateway-to-host). This host has to run a SQL-Server that I can access from the other ISP's servers through the VPN tunnel. It seems looking at the RFC for IPsec that this should be possible using the features of Windows 2008, but I can't get it to work so far... It seems that I can't access any services running on the same computer or IP address used as the tunnel endpoint? Thanks Chris

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• recommendations for efficient offsite remote backup solution of vm's

  - by senorsmile

  I am looking for recommendations for backing up my current 6 vm's(and soon to grow to up to 20). Currently I am running a two node proxmox cluster(which is a debian base using kvm for virtualization with a custom web front end to administer). I have two nearly identical boxes with amd phenom II x4's and asus motherboards. Each has 4 500 GB sata2 hdd's, 1 for the os and other data for the proxmox install, and 3 using mdadm+drbd+lvm to share the 1.5 TB's of storage between the two machines. I mount lvm images to kvm for all of the virtual machines. I currently have the ability to do live transfer from one machine to the other, typically within seconds(it takes about 2 minutes on the largest vm running win2008 with m$ sql server). I am using proxmox's built-in vzdump utility to take snapshots of the vm's and store those on an external harddrive on the network. I then have jungledisk service (using rackspace) to sync the vzdump folder for remote offsite backup. This is all fine and dandy, but it's not very scalable. For one, the backups themselves can take up to a few hours every night. With jungledisk's block level incremental transfers, the sync only transfers a small portion of the data offsite, but that still takes at least a half an hour. The much better solution would of course be something that allows me to instantly take the difference of two time points (say what was written from 6am to 7am), zip it, then send that difference file to the backup server which would instantly transfer to the remote storage on rackspace. I have looked a little into zfs and it's ability to do send/receive. That coupled with a pipe of the data in bzip or something would seem perfect. However, it seems that implementing a nexenta server with zfs would essentially require at least one or two more dedicated storage servers to serve iSCSI block volumes (via zvol's???) to the proxmox servers. I would prefer to keep the setup as minimal as possible (i.e. NOT having separate storage servers) if at all possible. I have also briefly read about zumastor. It looks like it could also do what I want, but it appears to have halted development in 2008. So, zfs, zumastor or other?

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