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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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  • Unable to login into CentOS

    - by Rendl
    I had setup a multinode cluster using CentOS with VMware yesterday. Today when I reboot the nodes I get the below error on startup. "there is a problem with the configuration server status 256 centOS" (/usr/libexec/gconf-sanity-check-2 ) I am unable to login as root or any user as the screen is frozen. The solutions online is to change the permissions for some tmp files. My problem is I am unable to access the terminal as I cannot login. Also on reboot I do not have any recovery options in CentOS. I only see command line GRUB. I am new to linux and Hadoop.Pls help asap.

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  • How can one domain route to an always-changing pool of servers?

    - by ryeguy
    I'm sure this is an easy solution, I'm just not too familiar with how DNS works or if that's even related to this problem. If I'm running a web service on amazon ec2, distributed across many instances, how can I make it so a single domain name can be used to access the entire pool of servers, which will be changing from time to time? Since the instances may be present one second but gone the next (and vice versa), I need a way to randomly pick an active member of the cluster to route to. The updates would have to be instantaneous. Is this even possible, with dns caching and all?

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  • How to sort time column by value instead of alphabetically

    - by Turch
    I'm creating a pivot table by connecting to an SSAS tabular model (Data - From Other Sources - From Analysis Services) . The model has a "time" column that I want to sort by. The default (database) sorting is earliest to latest: When I click the triangle next to 'Row Labels' and select "Sort A to Z", I get alphabetically sorted times: How can I get the times to sort by time? Changing the number format from "General" to "Time" does nothing. The times aren't stored as text either - the data type of the column in the SSAS model is Auto (Date)

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  • Configuring memcached for a particular scenario

    - by pradeepchhetri
    I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow. In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached. Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time. Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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  • Kill program after it outputs a given line, from a shell script

    - by Paul
    Background: I am writing a test script for a piece of computational biology software. The software I am testing can take days or even weeks to run, so it has a recover functionality built in, in the case of system crashes or power failures. I am trying to figure out how to test the recovery system. Specifically, I can't figure out a way to "crash" the program in a controlled manner. I was thinking of somehow timing a SIGKILL instruction to run after some amount of time. This is probably not ideal, as the test case isn't guaranteed to run the same speed every time (it runs in a shared environment), so comparing the logs to desired output would be difficult. This software DOES print a line for each section of analysis it completes. Question: I was wondering if there was a good/elegant way (in a shell script) to capture output from a program and then kill the program when a given line/# of lines is output by the program?

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  • solr administration

    - by devrick0
    Does anyone have any notes for an sysadmin supporting solr? I'm looking for anything that might be useful for monitoring & metrics as well as troubleshooting. Some useful links I have found are: /solr/admin/stats.jsp and /solr/admin/analysis.jsp In the logs I have noticed, other than the query, "hits", "status" and "QTime" values. The documentation on what these mean is sparse at least based on the 100+ websites I have checked. QTime appears to be the query time response in milliseconds. Hits is some form of results but I'm not sure exactly what makes that up and I'm not sure about status. Typically I see status come back as "0" but I have seen other numbers such as "5", so my thoughts that it could be either HTTP status codes or a 0 or 1 (good or bad) methodology isn't accurate. All of the documentation I have come across is intended for developers. Any sysadmin-centric documentation would be a big help.

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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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  • Forensics on Virtual Private servers [closed]

    - by intiha
    So these days with talks about having hacked machines being used for malware spreading and botnet C&C, the one issue that is not clear to me is what do the law enforcement agencies do once they have identified a server as being a source or controller of attack/APT and that server is a VPS on my cluster/datacenter? Do they take away the entire machine? This option seems to have a lot of collateral damage associated with it, so I am not sure what happens and what are the best practices for system admins for helping law enforcement with its job while keeping our jobs!

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  • ruby on rails server is intermittently slow

    - by Richard
    My rails installation was chugging along nicely. Last night we had to perform a hot-patch with was really a standard deploy of some exception code. Once capistrano finished the operation one of our admins discovered that there were two long running passenger processes. While we have deployed release over the past two weeks it would appear that these processes have been here and alive the whole time. Granted they could have been zombies or any other artifact and at this point we do not know what state they were in. Which leads me to the question: There are so many moving parts between the rails application and the OS/hardware that being a SME is probably no longer possible. So; how does a sysadmin perform root-cause analysis with any certainty? And: When do I just start rebooting servers?

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  • Postfix cleanup daemon access control

    - by Flimzy
    Is there any way to control which hosts are permitted to connect to the cleanup daemon over TCP? Our 'master.cf' contains: 2526 inet n - - - 0 cleanup This is necessary because we have a cluster of SMTP servers running custom code, and they can all inject mail to the centralized postfix server via the cleanup daemon. However, we want to allow only our authorized servers to connect to the cleanup daemon. The current configuration allows any host to connect to port 2526. Clearly we can use iptables to restrict access, but is there a way to do this within postfix itself?

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  • Can I recover files on a disk With 5% of start of disk completely wiped (overwritten with 1s)

    - by ARA
    Recently a virus attacked my pc and cleared 5% of my hard disk which has one partition I viewed the disk in a hex viewer program like active undelete ,cleared the virus data and overwrote it with 1s I want to recover a large file that is about 10gb, but no recovery tools seem to be able to recover any files. I want to know ,in theory, is this file recoverable ? I think that files are fragmented, researched about NTFS File System and i understand cluster information are just saved in MFT File ? Is there any way to recover file without a MFT structure ?

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  • RSAT and double accounts

    - by Ryaner
    Since we are looking at migrating our domain admins to use non domain-admin accounts and runas for admin tasks a discussion has begun. How do others use RSAT with runas? I know you can Shift+RightClick run as other user to launch it with admin rights, but it looses the icon on the taskbar. The question also has been put, why do Microsoft release the RSAT tools if they recommend admins to run using non-domain accounts. Edit: Further to this, some of the initial testing with RSAT via the run as other user command hasn't worked out well. Few of the options don't function in the Hyper-V and Failover Cluster Manager.

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  • Multiple public/private key pairs for the same user

    - by bruceb
    First, sorry if this question has already been asked/answered - I've searched but perhaps I haven't recognised the answer.... What we have is a cluster of servers which need to access a single remote server using sftp. We are migrating from one remote server to another at the same (remote) location. We also want to refresh the public/private key pairs on the configuration as part of an ongoing security review. My question is - can we have multiple public/private key pairs for the same user between server A and server B? I want to do this to allow for cutover testing - but am concerned that the software checking keys may only try one of each type (rsa/dsa?) before rejecting the connection method and moving to the next type of key. Hope it's a straightforward question - please let me know if I need to supply more details. Thanks in advance Bruce

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  • Multiple FIle Upload in FTP Using CMD

    - by user697363
    I've large number of files, over 10,000, which I want to upload in FTP server. Now, I can't zip those files & upload it as I've to read those files individually in SAS software for my analysis. If I use mput commant, then the prompt as me to say "y" eact time it tries to upload the file. This is very cumbersome. Is there any method by which it automatically upload the files without I've to manually entering "y" each time file wants to upload. The command I was using was: ftp ftp.myftp.com *my ftp server name username:myusername password:mypassword ftp> lcd c:\local_folder ftp> mput *.*

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  • High Availability Clustering and Virtualization

    - by tmcallaghan
    I'm trying to understand how the various virtualization vendors (specifically Amazon EC2, but also VMware and Xen) enable software vendors to provide a real HA solution in the environment where the servers are virtualized. Specifically, if I'm running any HA application (exchange, databases, etc) I need to ensure that my redundant virtual "servers" aren't located on the same physical server. Using in-house virtualization solutions (VMware, Xen, etc) I can provision accordingly as well as check the virtual - physical arrangement. I could, however, accidentally "vmotion" to the same physical hardware. With EC2, I don't even have the ability at provision time to select different physical servers. Since their Cluster Compute Instances are 1 virtual server per physical server it seems to be the only way to guarantee I don't have a false sense of redundancy. Any ideas or thoughts would be helpful. What are others doing about this problem? If the vendors provided an API where I could get something as simple as a unique physical system identifier I could at least know if I'm going to have an issue. -Tim

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  • Storage sizing for virtual machines

    - by njo
    I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when researching how to translate observed performance (weeks of perfmon data) to hdd array requirements for a virtualization server. I am familiar with the concept of IOPs, but they seem to be an overly simplistic measurement that fails to take into account cache, write combining, etc. Is there a seminal work on storage array performance analysis that I'm missing? This seems like an area where hearsay and 'black magic' have taken over for cold, hard fact.

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  • Windows 2012 Master & Ubuntu Bind 9 Slave & SOA

    - by RecentCoin
    I'm kinda like the maid... I don't do Windows. But thanks to new things we're implementing, I'm now attempting replicating a single zone from our AD cluster. We had this working just fine but someone had to "adjust" it. That broke the replication completely. We've gotten that restarted but now a different DC is showing as the SOA. Does it matter which of the domain controllers is listed as the SOA? The contents of the zone file appear to be correct. Part of me says "Good enough. Leave it be." but the rest of me doesn't want a 3AM phone call. So does anyone know if it matters which DC is listed as the SOA?

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  • MongoDB PHP EC2 Setup Configuration

    - by nathansizemore
    I am new to web development and server set up. I am looking for some advice or a link to a tutorial on setting up a production system up. Right now, I have a server (Ubuntu, Apache, MongoDB, and PHP). It receives a request, PHP queries Mongo, and PHP sends out the requested data. How do I make that work with more servers? I've read that you can make a cluster of a primary and two slave nodes which work as separate servers running Mongo, but do those also run PHP? Or is the primary the only one running the PHP? I have read some docs on Mongo site and a video of someone from 10gen going through it, but they are geared towards people that seem to already understand this stuff, I have no idea and need to start from a beginning stage. If anyone can help me understand where PHP (Acting as my API) lives in these clusters, that would be greatly appreciated! Thanks in advance for any help!

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  • Monitor someone on server

    - by edo
    Im in the unfortunate position of having to give someone who I do not fully trust privileged access to a webserver to finish work that they never completed. They will access the server remotely (ie I will not be able to see their screen). What can be done to a) proactively limit any potential damage and b) accurately log anything they do on the server for analysis afterwards, even if things seem ok? They will be updating a web application. Thanks in advance! --- More informtion: The server is a Ubuntu AWS server.

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  • Howto setup a `veth` virtual network

    - by Reinder
    I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it without LXC if possible. I tried using: Created three veth pairs: sudo ip link add type veth Created a bridge sudo brctl addbr br0 Added one of each pair to the bridge: sudo brctl addif br0 veth1 sudo brctl addif br0 veth3 sudo brctl addif br0 veth5 Configured the interfaces: sudo ifconfig veth0 10.0.0.201 netmask 255.255.255.0 up sudo ifconfig veth2 10.0.0.202 netmask 255.255.255.0 up sudo ifconfig veth4 10.0.0.203 netmask 255.255.255.0 up Then I verified if is works using: ping -I veth0 10.0.0.202 but it doesn't :( The I added IP addresses to the veth1,veth3,veth5 and br0 interfaces in the 10.0.1.x/24 range. But that doesn't help. Any ideas? or a guide, all I find in how to use it with LXC. Or am I trying something that isn't possible?

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  • Is it possible to extend the Active Directory schema in a Windows 2003 DC (NOT R2) to support DFSR?

    - by JohannesH
    We're in the process of installing a brand new Windows Server 2008 Web cluster and we would like to synchronize some files between the servers. The problem is that the DC in the domain is an old Windows Server 2003 Standard (NOT R2) which apparently doesn't contain some extension to the AD schema. Is it possible to upgrade the schema without upgrading the DC servers to R2? When I try to create a Replication Group on the 2008 Server I get the following message: --------------------------- Error --------------------------- srv.XXXXXX.XX: The Active Directory Domain Services schema on domain controller activedc07.srv.XXXXXX.XX cannot be read. This error might be caused by a schema that has not been extended, or was extended improperly. See Help and Support Center for information about extending the Active Directory Domain Services schema. Schema version 30 is not supported. --------------------------- OK ---------------------------

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  • Should I never put a transactional replication distributor on a subscriber server?

    - by Stuart Branham
    What factors into choosing a distribution server for transactional replication? In our topology, we've always had the distributor reside on the publishing server. We rarely generate snapshots and performance is good enough, so this is okay for us today. One of our instances is moving to a cluster, so we need to move the distributor off for resilience/symmetry. Right now our two choices are to use a server physically close to the publishers, or our single subscription server. Our publisher is in our main office, and our subscriber is in a colocation facility off-site which our ISP runs. We have a pretty good line to it. The reason we're even considering the latter is to save work and licensing costs.

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  • Is it possible to extend the ad schema in a Win2003 DC Server (NOT R2) to support DFSR?

    - by JohannesH
    we're in the process of installing a brand new Windows Server 2008 Web cluster and we would like to synchronize some files between the servers. The problem is that the DC in the domain is an old Windows Server 2003 Standard (NOT R2) which apparently doesn't contain some extension to the AD schema. Is it possible to upgrade the schema without upgrading the DC servers to R2? When I try to create a Replication Group on the 2008 Server I get the following message: --------------------------- Error --------------------------- srv.XXXXXX.XX: The Active Directory Domain Services schema on domain controller activedc07.srv.XXXXXX.XX cannot be read. This error might be caused by a schema that has not been extended, or was extended improperly. See Help and Support Center for information about extending the Active Directory Domain Services schema. Schema version 30 is not supported. --------------------------- OK ---------------------------

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  • Any Microsoft SQL Server 2008 licensing restrictions on usage?

    - by ryrobes
    Does Microsoft have any problems with HOW I USE SQL Server Standard Edition 2008? I plan on using it to aggregate my clients various data sources and report on them (using the whole stack - SSIS, DB, Analysis Services and Reporting Services) via the web. I don't want to run into any issues with being accused of "re-selling" services / features when I'm not allowed to, etc. In essence, I'm charging people to build them solutions based on / using MY licensed copy and then giving them access to the final products. (reports, etc) It seems straightforward enough - but who knows with MS... (BTW, Licensed by processor / not CAL)

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