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• Windows 2008 Server Unable to activate with other methods

  - by matt king

  I'm trying to activate windows 2008 server SP2 today since the activation trial is done. I do not have an internet connection with this server so I can not activate online, and with the other servers in this farm I've been able to run the slmgr -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx and then it would open up the activate by phone method and we would just activate that way. I say again, I don't have an internet connection so I can not do the online activate. If I do the slui 4 it brings up the activation window but show me other ways to activate is still greyed out. I've disabled the NIC on this Hyper-V server and I still can not get the other way to activate to show up... Anyone have any ideas? This computer is one of my AD servers so.. it being in notification mode kind of sucks. Thanks.

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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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• Network monitoring library, or objects, for a cloud

  - by Andrew Smith

  I am looking for library to support server / switch monitoring, to actually be able to check with the device if it's working OK. However this requires some sort of auto-detection and device support. Basically I need to automatically detect a new device, start monitoring it like CPU and PING. So how do I auto-detect the machine remotely, this is something I need library for. Rackspace has something like this - "Cloud Monitoring API". But is there anything opensource which can be used same way? The Nagios and others doesnt have such API, and the big and expensive systems are too big to handle in public cloud, so there must be some other network monitoring engine with API, which can add a new servers automatically and support user isolation for example so I dont see other servers except mine.

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• rsyslog server - Can you split up and organize logs?

  - by Jakobud

  I recently setup one of our servers as an rsyslog server. I now have our firewall setup to log everything to that rsyslog server. But there doesn't seem to be an organization of the logs. All the firewall logs are just being dumped into the /var/log/messages on the rsyslog server. I guess I was maybe expecting them to at least be in a machine specific log file or directory. How can I organize the incoming logging? If I setup 20 servers to all log everything to a central rsyslog server, I really don't want everything being dumped into one big file or a few files. How can I setup rsyslog to tell it where to log what? Like if all the logs for a specific server were in it's own directory/file, etc... Is this possible?

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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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• Amazon EC2 Elastic Load Balancing - strategy for zero downtime server restart

  - by Yoga

  I have 5 web servers (Apache/mod_perl) behind Amazon EC2 Elastic Load Balancing, when I deploy codes to the web servers, I am doing this.. For each machine, shutdown the Apache Update the code Start over the server and proceed to the next server I think when my server is shutdown, ELB will not distribute request to my server, but how about the request still serving? I think a better approach is Stop accepting new request from ELB Sleep for sometimes, shutdown web server only if all requests are responded Update the codes Start the server again But how to perform (1) and (2) from my local sever? Do I need to use AWS API? or other easy way to do it? Thanks.

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• SAN/NAS with high availability?

  - by netvope

  I have two servers that I plan to use for storage. Each of them has a few SATA disks directly attached. I want the storage to be available even if one of the storage servers is down (preferably the clients wouldn't even notice that the fail-over, although I'm not sure if this is possible). The clients may access the storage via NFS and samba, but this is not a must; I could use something else if needed. I found this guide, Installing and Configuring Openfiler with DRBD and Heartbeat, which apparently does the thing I want. It relies on three components, Openfiler, DRBD, and Heartbeat, and all three of them need to be configured separately. I'm wondering are there simpler solutions? Is using DRBD+Heartbeat the best practice for a situation like mine? I'm also interested to know if there are alternatives that don't depend on DRBD.

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• How to bypass Forefront TMG for downloading from Adobe Cloud

  - by user1006272

  I hope that this question has not been asked as I've spent a couple of days googling around trying to find a solution. I have one computer that needs to download from Adobe Cloud to install applications like Photoshop etc... The issue I'm having is that Adobe uses a download manager program (AdobeApplicationManager.exe) that just keeps incrementing the time left on the download of any app like Photoshop. Is there a way to allow just the download manager from that one computer to bypass any filtering settings in Forefront TMG 2010? I have very little knowledge of servers / ISA servers / Forefront TMG and have been thrown into this position by luck I guess. Any help with this would be highly appreciated. Thanks in advance.

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• Configuring weblogic server console with external server urls, etc

  - by MeBigFatGuy

  there are obviously various 'canned' configuration options in oracle's weblogic server console for setting up data sources, jms queues, ldap servers etc, etc. What i want however is a way to configure other servers, mostly server urls, etc, in the console as well, and allow web applications running on the web server to access those configuration settings at runtime, probably through jndi names. Things like a document management server, a workflow server, etc. However I'm at a loss for how to configure custom jndi 'data sources' within wls' console. Is this possible?

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• DNS propagation

  - by Paddington

  I have 1 primary DNS server (ns1.mydomain.com) running on Fedora and 2 secondary ones (ns2 and ns3). DNS changes made on my web servers first goes to the primary name server and then propagates to the secondary servers. After making a DNS change on a domain on the web server, I can't see the new dns information on my ns1 when I perform: dig @ns1 A blahblah.com I then went to the master records on the names server (uses named) in the directory /var/named/run-root/var/named/masters and I see the A record has been updated appropriately. Tailing the logs /var/log/messages is not showing any errors. What could be the issue?

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• How secure is using "Normal password" for SMTP with connection type = STARTTLS?

  - by harshath.jr

  I'm using an email client for the first time - for the most part I've always used gmail via the web interface. Now I'm setting up thunderbird to connect to an email server of my own (on my own server, own domain name, etc). The server machine (and the email server on it) was preconfigured for me. Now i figured out away by which I'm able to send and receive email, but I noticed that in the outgoing and incoming servers section, the connection type was STARTTLS (and not SSL/TLS), and the Authentication Type was "Normal Password". Does this mean that the password will be sent across in plain text? I'm very paranoid about security - its the only way that it works for me. Can someone please post links that explain how SMTP (my outbound server) and IMAP (my inbound server) servers work, and what connection type means what? Thanks! PS: If this question does not belong here, please redirect me.

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• Amazon EC2 Web server in Load Balancer gives 503

  - by dale

  we've been running our web servers at Amazon with load balancer and auto-scaling for over a year with no problem. All of a sudden today the request began to get aborted with the error: 503 ... Backend server is at capacity The web servers are at 1% CPU and no other alarms trigger. We use Amazons load balancer and nginx. Lots of requests like this are showing up in the access_log. 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" Any thoughts?

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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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• 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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• Nagios remote monitoring: NRPE Vs. SSH

  - by sam

  We use Nagios to monitor quite a few (~130) servers. We monitor CPU, Disk, RAM and a few other things on each server. I've always used SSH to run the remote commands, purely because it requires little to no additional config on the remote server, just install nagios-plugins, create the nagios user and add the SSH key, all of which I've automated into a shell script. I've never actually considered the performance implications of using SSH over NRPE. I'm not too bothered about the load hit on the Nagios server (It's probably over-speced for what it does, it's never been over 10% CPU), but we run each remote check every 30 seconds and each server has 5 different checks performed. I assume SSH requires more resources for each check but is there a huge difference? (I.E. enough of a difference to warrant the switch to NRPE). If it's any help, we monitor a mix of physical servers (Normally with 8, 12 or 16 physical cores) and Amazon EC2 medium/large instances.

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• Dealing with LDAP failure when using it for PAM/NSS?

  - by Insyte

  I use a redundant pair of OpenLDAP servers for PAM auth and directory services via NSS. It's been 100% reliable so far, but nothing runs flawlessly forever. What steps should I take now so I have a fighting chance of recovering from failure of the LDAP server(s)? In my informal testing, it appears that even already authenticated shells are largely useless as all username/uid lookups hang until the directory server comes back. So far I've come up with only two things: Do not use NSS-LDAP and PAM-LDAP on the LDAP servers themselves. Create a root-level account on all boxes that only accepts publickey authentication from our local subnet and protect that key well. I'm not sure how much good this would do me as once I'm logged in, I suspect I wouldn't be able to accomplish anything since all the userid lookups would be hanging. Any other suggestions?

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• What Sort of Server Setup Am I Likely to Need? - School A/V streaming

  - by DeathMagus

  My prior experience with servers has generally been limited to home file-sharing servers, low-traffic web-servers, and the like. This leaves me with the technical knowledge of how to set up a system, but little experience in terms of scaling said system. My current project, however, has me as the technical lead in setting up a school for online audio and video streaming. The difficulty I'm running into is that I don't quite have the experience to guess what they'll need, and they don't have the experience to tell me - so I've tried to ask as many pertinent questions about what they want to do with their server, and here's what I found out: About 1000 simultaneous users, and hoping to expand (possibly significantly) Both video and audio streaming, at obviously the highest quality possible Support for both live and playlist-based streaming. Probably only one channel, but as it's an educational opportunity, I imagine letting them have a few more wouldn't hurt. No word on whether they're locked into Windows or whether Linux is acceptable. Approximate budget - $7000. It may actually be about $2k less than this, because of a mishap with another technology firm (they ordered a $7000 DV tape deck for some reason, and now the company wants them to pay a 30% restocking fee). The tentative decisions I've already made: I'm planning on using Icecast 2 for my streaming server, fed by VLC Shoutcast encoding. Since the school already has a DMZ set up, I plan on placing the Icecast server in there, and feeding it through their intranet from a simple workstation computer in their studios. This system isn't in any way mission critical - it's an education tool (they're a media magnet school), so I figure redundancy is not worthwhile to them from a cost:benefit perspective. What I don't know is this: How powerful of a server will I need? What is likely to be my major throttle - bandwidth? How can I mitigate that? Will I need anything special for the encoding workstation other than professional video and audio capture cards and a copy of VLC? Are there any other considerations that I'm simply missing? Thanks a lot for any help - if there's more information you need, let me know and I'll tell you all I can.

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• Solaris 10 5/09 can't find SATA disk

  - by anon

  We need to run standard Solaris 10 on a few development servers (Dell 530s) because we can't get a commercial application running on OpenSolaris (we're still trying). However, we are finding that sometimes when Solaris 10 goes to do the install, after setup screens, it can't find the SATA drive. We tried the BIOS setting described here: BigAdmin On some Dells 530s, Solaris GA installs fine, but on others it doesn't. OpenSolaris always installs. Is there some way we can determine (eg. installing OpenSolaris and examining the SATA driver used) what OpenSolaris detected and use some option or driver from it to get Solaris 10 installed on our development Dell servers?

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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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• Design Question

  - by dturner71

  Can I have two independent Connection servers attached to the same vCenter server? Here's my scenario. I'm setting up View 4 to provide desktops to two seperate Windows domains that are on different IP subnets seperated by a firewall. One cluster of physical servers, one vCenter server, linked clones. As I understand it View Connection server has to be a member of a Windows domain in order for quickprep to work. So the way to provide desktops to both Windows domains is to have a Connection server in each one right? Then open ports in the firewall so the Connection server from the other subnet can communicate with vCenter. Any reason why this won't work? Or is there a better way to accomplish it?

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• VMware ESX 3.5 Host Health shown as unknown

  - by dunxd

  I have an ESX 3.5 update 5 cluster of five host servers, all fully patched as of this Friday. Today I noticed that one of the servers has the Hardware Health status as unknown in Virtual Center Infrastructure Client. When I look at the Health Status view under configuration for that host, all the items are status Unknown. The server is exactly the same configuration as the others - same model (HP DL360 G5), memory, NICs etc. I have tried restarting the management service with service mgmt-vmware restart but this has not resolved the issue. Asides from this, I am not seeing any issues with the cluster - however, I hate having a blind spot like this. Any ideas?

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• Clustering with Vsphere and Apache load balacing

  - by Anonymous2011

  I was looking at Vsphere to automatically load balance my apache web servers, and mysql servers but will this actually do the job? I know it says it does auto load balancing but not actually sure it quite means what I want to achieve. Is there an easier way to set up a php-apache and mysql cluster within virtual machines? Or are there any guides to clustering? (I have tried googling without much luck) Any help towards understanding/setting up clustering and load balancing within virtual machines appreciated.

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• Unused Index Entries: What causes them?

  - by Bart Silverstrim

  I was running chkdsk on one of our servers and it fixed 800 unused index entries (minor inconsistencies) on the drive. I also see these on lab machines running Deep Freeze, where most drive changes are supposed to be prevented although I'm not sure of the mechanism through which it does this. The thing that got me more curious than usual is that this server does very little. Very little activity, it remotely serves out a web app with little use so it's rarely ever touched at the console...so what is it on NTFS drives that causes this? It seems to be treated as if it's nothing, but should this be happening on a barely used filesystem? Is it a sign of corruption? I would think it's something if a disk repair utility sees fit to report it and repair it. Maybe this is more curiosity while doing some routine maintenance on servers, but I'd like to know what this is doing and why it happens, if anyone can give insight on this phenomena.

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• Do TCP connections work differently within the same subnet?

  - by Dean

  I've encountered some network behaviour that confuses me while trying to get Java RMI working. I use netcat to connect to a local machine: [my_machine]$ nc -w 1 192.168.0.100 60000 && echo success success I try to do the same to my server: [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success This doesn't work, unless I explicitly listen on the server socket: [amazon_ec2]$ nc -l 60000 [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success success For the version that fails, the SYN packet receives a RST, ACK in response. I'm not too knowledgable about this stuff, at this point I only have wild theories such as the one in the question. Any ideas? Potentially useful details: Local Machine (192.168.0.100) - Macbook Remote Machine (Amazon EC2) - Amazon Linux AMI 2012.03 Security Group Settings: 22 (SSH) 0.0.0.0/0 1099 0.0.0.0/0 49152-65535 0.0.0.0/0 "iptables -L" shows no rules set

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• Different configurations for ssh client depending on ip address or hostname

  - by John Smith Optional

  I have this in my ~/.ssh/config directory: Host 12.34.56.78 IdentityFile ~/.ssh/my_identity_file When I ssh to 12.34.56.78, everything works fine. I'm asked for the passphrase for "my_identity_file" and I can connect to the server. However, sometimes I'd also like to ssh to another server. But whatever the server, if I do: ssh [email protected] I'm also asked for the passphrase for "my_identity_file" (even though the server has a different ip address). This is very annoying because I don't have the public key for this file set up on all my servers. I'd like to connect to this other server (an old shared hosting account) with a password, and now I cant. How do I manage to use the key authentication only with one server, and keep using password by default for servers that aren't listed in my ~/.ssh/config ? Thanks for your help.

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