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• Run disk error check on NTFS file?

  - by paulius_l

  I have a feeling that my system hard drive is dying. Benchmark kind of enforces it. Here is the benchmark of my system hard drive during low system activity: And here is the benchmark of backup drive: Furthermore, there are some files which I just can't touch because I get CRC errors and the hard drive activity spikes to 100% with operating speeds less than 1 MB/s while working with such files. I haven't yet tried swapping SATA cable as I have read this might cause the problems. Anyway, I would like to run some tests on specific clustsers where those files I am interested in are stored. I don't want to do the full chkdsk because it takes a very long time. I would like to either find the utility which executes the disk check directly on the clusters where the file belongs or a couple utilities where one tells me the cluster locations and another can check just those locations. How do I check and possibly fix disk errors where the files I am interested in are stored? Edit: S.M.A.R.T. info:

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• Techniques to Monitor cron tasks?

  - by Tristan Juricek

  Are there good techniques for monitoring cron tasks over a cluster? We're starting to use cron to launch tasks at daily intervals. A few ideas for checking out information: Add special application handling that logs information into some "network aware" place, like a DB Build up a logfile system that transfers the cron log periodically to a central point for processing/querying (along with other possible log files) I'm wondering if people have had success with doing things separately for cron versus other things, or, if the tasks were integrated into a different approach completely. I'm leaning towards #2, but I'd like to know what more experienced folk might try out.

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• Updated: NLB 2 Windows Server 2003 Servers - Looking to Hire SysAdmin to solve!

  - by Paul Hinett

  I need to configure windows NLB on 2 dedicated servers I have. My main machine has been running for some time, with several domain names pointing to the servers primary IP address. Both servers have 2 NIC's installed, and both have several secondary public IP addresses available if needed? What IP address would I use for the cluster IP, does this IP need to be added to the IP list of both public NIC's ip address list? What IP addresses do I use for the host's dedicated IP? Please help, this is driving me nuts...i've taken down the server twice on accident today! UPDATE: Looking to hire a windows SysAdmin to solve! I have updated my question, i would like to hire a trusted windows SysAdmin to take care of this for me, preferably today...can anyone help and provide some credentials please? Thank you in advance!

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• Client side certificates in client browsers with unix server for management

  - by user146253

  We are currently running Unix dedicated servers for everything (Web cluster, database, FTP, batch, ...) except for a Microsoft Active Directory Certificate Services. The sole purpose of this Windows box is to provide client side certificates to our clients browsers. All our clients are required to install a client side certificate on order for them to be able to access our website. Is there an alternative in the Unix space? The purpose is to make sure only the approved hardware of an approved client can access our website. I'm open for any solution that provides me with this level of security. We are however talking about thousands of certified computers just so you can factor that in in a proposed solution. Optionally we would also like to be able to revoke access. With Regards.

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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• Thin web server - single or multiple instances per IP address:port?

  - by wchrisjohnson

  I'm deploying a rack/sinatra/web socket app onto several servers and will use thin as the web server (http://code.macournoyer.com/thin/). There are almost no views to show, so I am not front-ending it with a traditional web server like Apache or nginx. In general, you see thin started and the underlying config file for it has the number of server instances to start, say 3, and the port to start with, say 5000. So, in my example, when thin starts, it starts up three instances on a range of ports, starting on port 5000. If I have a series of virtual machines, say 3, 6, 9, etc. that I treat as a cluster, would/should I choose to start a single thin instance on each VM, or multiple instances on each VM? Why? Thanks - Chris

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• Virtual MS Sql Server not consuming enough CPU

  - by rocketman

  We have a Win2008 server 32 bit running as a virtual machine under ESX server. It has 6 CPU cores of 2Gz each and 4GB ram. It's running MS Sql Server 2008 R2 only. Problem: The server is heavily loaded and responds slowly. From windows taskmanagers point of view, it really looks overloaded, CPU wise. However, our external "cloud manager" says it's only using 2.5GHz worth of CPU-cycles in the cluster. I/O times looks "good". We have already tried to set the SQL servers number of working threads from 0(auto) to 256, to no effect. How to tune the VM host, guest or SQL to use all of it's alotted resources? Does it sound possible att all?

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• Multiple subnets behind SonicWall TZ 180

  - by Derek

  We have a SonicWall TZ180 that acts as a VPN endpoint. Right now it has one WAN IP address and a /24 assigned to the LAN interface. Our mail cluster administrator asked if it was possible to add a second private class C behind the VPN. This second subnet would be available to the other network and then we would use address objects and acls to limit access. Is this possible? I read up on PortShield but I don't know if that's what we would need to use because we're pushing all data out of one physical port into a Cisco switch that has VLANs already set up. Addendum: It appears that PortShields will do what I want with only one limitation; it requires a direct 1-1 relationship of portshield to physical port. This would then limit us to 4 PortShields on 1 TZ180. Is there a better solution than this?

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• NAT and NGINX on the same server

  - by Morten

  I'm setting up a VPC cluster for my collaborative todo list application www.getdoneapp.com. To have my servers on the private network I need a NAT server so my servers on the private network can connect to the internet to receive updates and what not. The NAT server will consume an elastic IP address, so I'm wondering if I can just have that NAT server run nginx to direct traffic to my internal servers for HTTP. So the question is, is it a bad idea to run NGINX and NAT on the same server, or should I go for consuming 2 elastic IP addresses?

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• CentOS: OpsCenter does not see other node's agent

  - by Alice

  I'm new with Apache Cassandra. I am trying to install a little sample cluster using two CentOS server. I followed the documentation (Tarball installation) and the nodes are up. However, when I go to OpsCenter, the nodes cannot see each other's agent (there is always "1 of 2 agents connected"..I tried to fix, but nothing change). I tried both to disable and enable SSL, I tried to set the incoming_interface in opscenter.conf, I tried almost everything the network suggested to me, but the problem persisted. Now, I have SSL enabled, and agent log tell me: "There was an error when attempting to load stored rollups." Is there someone that could help me, please?

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• HAProxy and Intermediate SSL Certificate Issue

  - by Sam K

  We are currently experiencing an issue with verifying a Comodo SSL certificate on an Ubuntu AWS cluster. Browsers are displaying the site/content fine and showing all the relevant certificate information (at least, all the ones we've checked), but certain network proxies and the online SSL checkers are showing we have an incomplete chain. We have tried the following to try to resolve this: Upgraded haproxy to the latest 1.5.3 Created a concatenated ".pem" file containing all the certificate (site, intermediate, w/ and w/out root) Added an explicit "ca-file" attribute to the "bind" line in our haproxy.cfg file. The ".pem" file verifies OK using openssl. The various intermediate and root certificates are installed and showing in /etc/ssl/certs. But the checks still come back with an incomplete chain. Can anyone advise about anything else we can check or any other changes we can make to try to fix this? Many thanks in advance... UPDATE: The only relevant line from the haproxy.cfg (I believe), is this one: bind *:443 ssl crt /etc/ssl/domainaname.com.pem

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• having trouble setting up ganglia on three machines

  - by Pieter Breed

  I am running ubuntu 11.10 I have one machine with gmetad, gmond and ganglia-webinterface. When I browse the web interface this machine picks up the local gmond output. I then added another machine, running only gmond. I didn't really change anything in the config, only the name of the cluster. This machine's output showed up in the web view. The I tried to add a third machine, similarly to the second, but it's not showing up in the web view. I tried looking at syslog and running as a daemon, but I'm not seeing anything suspicious there. Any tips for trouble shooting this?

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• Corosync - stopping the service crashes the server

  - by Antipop

  I am trying to set up a test cluster on a Xen Server with 2 paravirtualized CentOS 5.4 machines. I am using Pacemaker+Corosync, and following the instructions found at http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf and other sites. Anyway, when I try to manually stop the corosync service, about 80% of the times the whole VM locks up with the message "Waiting for corosync services to unload" and I am forced to shut the machine down manually. For the remaining 20%, the VM keeps responding and adds dots to the above message, but it won't actually stop the service. There aren't many resources on the internet about this particular error. Any ideas about this? Thanks in advance.

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• Cheapest High Available Web Server [closed]

  - by xyz

  I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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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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• How to install a proxy LDAP

  - by Jean-Claude

  I have to install an LDAP proxy on a compute cluster frontend. The idea is to avoid the compute nodes to make too many requests on the campus LDAP server. How can I install this to make it work with the school's LDAP? The frontend OS is a RHEL 6.2. I found that I have to install the LDAP server and configure it as a proxy. But all I can find is examples of /etc/openldap/slapd.conf file configuration but after testing different configuration, no results. Furthermore, according to RHEL 6 - Deployment Guide, this config file is obsolete: OpenLDAP no longer reads its configuration from the /etc/openldap/slapd.conf file. Instead, it uses a configuration database located in the /etc/openldap/slapd.d/ directory. Any help is welcomed. Thank you

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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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• Config deployment on multiple servers.

  - by user66601

  I have multiple servers in WEB cluster (identical configuration for all of them, despite the IP) How do you deploy changes in configs on multile servers? I make the new config, then create config per every server (placing correct IP), and next: upload them on every server, replacing old ones (rsync over ssh) set on every server a job which reloads webserver at the same time (servers use ntp). - this done by issuing commands by script (to save time for logging in) before adding a job for server reload - there's checksum test of the config on the server) - an a notification in case of fail How do you see such method? What should be the "professional way :) ? (I don't say my way doesn't work... it works and saves my time not used for logging on every webserver.) Regards,

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• Logging the client IP with Nginx/Varnish/Apache

  - by jetboy

  I have Nginx listening on port 443 as an SSL terminator, and proxying unencrypted traffic to Varnish on the same server. Varnish 3 is handling this traffic, and traffic coming in directly on port 80. All traffic is passed, unencrypted, to Apache instances on other servers in the cluster. The Apache instances use mod_rpaf to replace the logged client IP with the contents of the X-Forwarded-For header. My problem is that if the traffic is coming via Nginx, while the 'correct' client IP is getting logged in the VarnishNCSA logs, it looks as if Varnish is (understandably) replacing Nginx's X-Forwarded-For header with 127.0.0.1 downstream, and this is getting logged with Apache. Is there a nice simple way to stop Varnish rewriting X-Forwarded-For if it's already populated?

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• MariaDB, Galera, xtrabackup - do I need the binary log?

  - by bernhardrusch

  We are using a MariaDB Galera Cluster with 3 nodes. For the state transfer we are using xtrabackup. We have some problems with the binary logs - they got too big and crashed the server. We can remove them manually with the purge binary logs command, another way would be to set the expire_logs_days so they would expire. I now that we could use xtrabackup to backup the DB and use the binlog to get to some point in time. But do we really need it for Galera to work ?

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• Is there a convenient method to pull files from a server in an SSH session?

  - by tel

  I often SSH into a cluster node for work and after processing want to pull several results back to my local machine for analysis. Typically, to do this I use a local shell to scp from the server, but this requires a lot of path manipulation. I'd prefer to use a syntax like interactive FTP and just 'pull' files from the server to my local pwd. Another possible solution might be to have some way to automatically set up my client computer as an ssh alias so that something like scp results home:~/results would work as expected. Is there any obscure SSH trick that'll do this for me? Working from grawity's answer, a complete solution in config files is something like local .ssh/config: Host ex HostName ssh.example.com RemoteForward 10101 localhost:22 ssh.example.com .ssh/config: Host home HostName localhost Port 10101 which lets me do commands exactly like scp results home: transferring the file results to my home machine.

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• List existing file server permission groups/users

  - by Patrick

  So we have taken over a new client and their existing file server is frankly a mess. We have migrated their old file server from a 2k box to a 2k8 DFS cluster and now I'm looking at rebuilding both the folder structure and their permissions. Unfortunately its been half done with AD groups (poorly named/no description/notes) and half with individuals named in security on the folders themselves. What I'm looking to do is to dump a complete list of all the folders with their security permissions (ideally I'd like to ignore files but not essential). CACLS got me half way there but fails with an odd error message and its output isn't particularly user friendly and I'm working with roughly 2Tb/250,000 files here so I really need something that gives me a bit more functionality. Question : does anyone have any experience of something similar/know of a bit of software that might help me out?

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• Failing RAM, or something else?

  - by Thanatos

  I have a IBM Thinkpad T43, currently running Windows XP. Programs were crashing, XP was blue-screen-of-deathing, (more than usual) - it was basically unusable, but I couldn't get any informative error out of XP. I booted Ubuntu off a thumbdrive, which made it to the desktop, but as soon as I started to try to do anything, X segfaulted, along with several other services, followed quickly by kernel warnings and a kernel panic. I'm currently running Memtest86+ on this machine, which is spitting out numerous errors. (16k over 3 passes, and counting) The failing areas are numerous, and look something like this: 0001055da4 - XX.X MB, etc. The addresses that fail seem to cluster around 0-20 MB, 250MB, and, more rarely, 750MB, 1000MB, and 1200MB. However, a lot (but not all) of the failing addresses that I've seen end in XXXXXXX?da4 where the ? is a 1 or a 5. The machine has two sticks of RAM, one 512MB, one 1024 MB, the 512MB mapped to the lower addresses, the 1024 MB stick following. Is this indeed RAM failure, or should I consider other things before purchasing more RAM?

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• What's a good tool for collecting statistics on filesystem usage?

  - by Kamil Kisiel

  We have a number of filesystems for our computational cluster, with a lot of users that store a lot of really large files. We'd like to monitor the filesystem and help optimize their usage of it, as well as plan for expansion. In order to this, we need some way to monitor how these filesystems are used. Essentially I'd like to know all sorts of statistics about the files: Age Frequency of access Last accessed times Types Sizes Ideally this information would be available in aggregate form for any directory so that we could monitor it based on project or user. Short of writing something up myself in Python, I haven't been able to find any tools capable of performing these duties. Any recommendations?

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• Raid5 is off on my Lefthand P4500

  - by Soeren

  I have 1 cluster with serveral p4500. There is HW Raid5 and the Raid5 is split on: first 6 is one raid 5, and the other 6 is one raid 5. There were two disk that came up with a fault. I replaced both disk in same Raid5. Now the storagesystem says that Volumes is unaccessable and the Raid5 of the P4500 is down. How can I get the lefthand up and working again? Ive tried to put the old disk in the P4500 again, but this does not help. I also tryed to restart the disk shelf as well. Do you have any idea? Or something to get it to work again?

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