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  • Routing a single request through multiple nginx backend apps

    - by Jonathan Oliver
    I wanted to get an idea if anything like the following scenario was possible: Nginx handles a request and routes it to some kind of authentication application where cookies and/or other kinds of security identifiers are interpreted and verified. The app perhaps makes a few additions to the request (appending authenticated headers). Failing authentication returns an HTTP 401. Nginx then takes the request and routes it through an authorization application which determines, based upon identity and the HTTP verb (put, delete, get, etc.) and URL in question, whether the actor/agent/user has permission to performed the intended action. Perhaps the authorization application modifies the request somewhat by appending another header, for example. Failing authorization returns 403. (Wash, rinse, repeat the proxy pattern for any number of services that want to participate in the request in some fashion.) Finally, Nginx routes the request into the actual application code where the request is inspected and the requested operations are executed according to the URL in question and where the identity of the user can be captured and understood by the application by looking at the altered HTTP request. Ideally, Nginx could do this natively or with a plugin. Any ideas? The alternative that I've considered is having Nginx hand off the initial request to the authentication application and then have this application proxy the request back through to Nginx (whether on the same box or another box). I know there are a number of applications frameworks (Django, RoR, etc.) that can do a lot of this stuff "in process", but I was trying to make things a little more generic and self contained where different applications could "hook" the HTTP pipeline of Nginx and then participate in, short circuit, and even modify the request accordingly. If Nginx can't do this, is anyone aware of other web servers that will perform in the manner described above?

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  • Monitor utilities

    - by Adam Davis
    I'm a big fan of good monitor usage, but only currently use a few utilities to help me attain display nirvana across several systems and monitors. Part of this is due to not knowing what's available. Please list one monitor utility that you use and what it does for you per answer, and avoid duplicates - comment on and vote up the existing answers rather than adding a duplicate. Also, if there are existing questions that delve more specifically into one area of monitor utilities link that in a separate answer. -Adam

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  • Database types for customer analytics

    - by Drewdavid
    I am exploring a paid solution to start providing better embedded, dashboard-style analytics information to our website customers/account holders, but would like to also offer an in-house development option to our team. The more equipped I am with specifics (such as the subject of this question), the better the adoption rate from the team (or so I have found), regardless of the path we choose Would anyone care to summarize a couple of options for a fast and scalable database type through which we would provide the following: • Daily pageviews to a users account pages (users have between 1 and 1000 pages) • Some calculated/compounded metrics (such as conversion rate, i.e. certain page type viewed to contact form thank you page ratio) • We have about 1,500 members (will need room to grow); the number of concurrently logged in users will for the question's sake be 50 I ask because our developer has balked at providing this level of "over time" granularity (i.e. daily) due to the number of space it would take up in a MYSQL database To avoid a downvote I have asked specifically for more than one option, realizing that different people will have different solutions. I will make amendments to my question if so guided by answering parties Thank you for sharing your valued answers :)

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  • tmux won't run as non root user?

    - by bumbling fool
    If I run tmux as root, it runs normally and fully functional. I created a couple users, and it will not run as any of the users. create session failed: : No such file or directory I checked the outside $TERM is xterm and inside $TERM is screen as FAQs suggest that is most common cause of problems. I've used tmux regularly on many different systems, but I on this VPS I can't figure out what's up... A little help, please? EDIT: strace output

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  • Running SEP scans with the SYSTEM account

    - by Eric
    I need to run Symantec Endpoint Protection scans on Windows 7 systems using the SYSTEM account. I know that I can run DoScan.exe to manually run a scan, and this works fine using a regular user account. Unfortunately, when I try to run DoScan as SYSTEM, the application exits immediately without running a scan. Is there a way that I can get this to work, or another application besides DoScan.exe that I should be using?

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  • Sharepoint/WSS Reporting Services Integration woes

    - by mhollers
    after a number of failed attempts i seem to have successfully installed the Reporting services add-in to my WSS farm. However, I seem to be missing most of the enhanced functionality eg no report library template, no report center site template. the only additional functionality available is the report viewer web part. background: 2 server WSS 3.0 farm with CA (Central admin) WFE (web front end) and reporting services addin installed on 1, and SQL05 SP2 with Reporting services (RS) and all databases installed on other. I have a VM environment set up and have rolled this back and repeated a number of times. I have configured RS within CA and activated 'Report Server INtegration Feature'. Within the 'site settings' I have a 'Reporting Services' heading with a 'manage shared schedules' item/link, not sure if there should be other options? I was of the understanding that to view reports within sharepoint i could either create a new site using the 'report center' template or add a report library to an existing site, neither of which seems available I am at a loss as to what to do, as all online information seems to do with dealing with installation issues/errors, which i seem to have eventually got past

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  • Home server hard drive: 186k start-stop cycles in 325 days?

    - by j-g-faustus
    I set up a home server about a year ago, using Ubuntu server (10.04 LTS at the moment), four disks in RAID 5 for storage (WD Green 1.5 TB) and a laptop drive for the OS. Today the output of smartctl, a command line utility for checking the SMART attributes of a hard drive, tells me that the primary OS drive has had no less than 186,000 start-stop cycles in 325 days and may be nearing the end of its lifespan. The smartctl output is in "normalized values", in this case a number between 200 and 000, where 200 is "brand new" and 000 means "worn out". My disk gets 001. So I wonder what happened: 186k start/stop cycles in 7820 hours is about one start/stop per 2.5 minutes around the clock. This seems somewhat excessive for a computer that sees actual use once or twice per day. (The RAID disks are normal, averaging to one start/stop per day, as expected.) Does anyone have similar experiences, or pointers to what might be the issue here? Specifically I'd like to know Why the massive start/stop count? Do I have some sort of configuration issue? Could there be a background service that is causing trouble? Could having a laptop disk as the OS drive be part of the problem? Can anyone confirm or deny this? Here is the /etc/hdparm.conf configuration /dev/sda { apm = 127 spindown_time = 120 } and the most relevant parts of smartctl --attributes /dev/sda: smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8 Bruce Allen === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 001 001 000 Old_age Always - 185875 9 Power_On_Hours 0x0032 090 090 000 Old_age Always - 7820 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 109 193 Load_Cycle_Count 0x0032 118 118 000 Old_age Always - 246833 194 Temperature_Celsius 0x0022 107 098 000 Old_age Always - 36 As I generally prefer my drives to last more than a year, any advice is appreciated.

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  • App-V Problems After SCCM 2007 SP2 Upgrade

    - by GAThrawn
    We're running an SCCM (MS System Centre Config Manager, successor to SMS) 2007 environment and delivering a number of applications to clients virtualized using App-V 4.5.1. The App-V apps are delivered by SCCM in Download-and-Execute, not streaming mode. The SCCM environment was recently service packed to SCCM 2007 SP2 (amongst other things this gives Win7 support). We also pushed out the updated SCCM clients to our workstations. This seems to have broken file associations for virtual apps for a large number of our users. The users can still open their App-V apps by finding the specific app on their Start Menu and clicking it's icon, but double-clicking an associated file in Explorer, or opening an email attachment gives the "This action is only valid for installed applications" error. There is a Technet blog entry from the App-V team talking about this issue "Upgrade to ConfigMgr 2007 SP2 may break App-V File Type Associations" but running the script there comes back saying "The User Interface option has been updated" but hasn't seemed to fix the problems for any of our users. Unfortunately the Technet blogs don't seem to have comments switched on so you can't see how this has worked out for other people. Anyone else had this problem, have you found any other way to fix it?

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  • Why do Linux networks use Samba?

    - by Dougal
    The "file and printer sharing" feature of Linux distros is mostly Samba. Samba is an interpretation of Microsoft's network filesystem. Cross-OS compatibility is important of course but why are Linux systems defaulting to this Microsoft technology? Is Microsoft's network filesystem so good? Samba clearly works very well and I'm not "dissing" it. Or, to rephrase the question, "What would be a Linux-native way to share files and printers across a network?"

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  • Querying Domain Controller objects using Powershell

    - by Neobyte
    Could someone explain to me why this does not work? Import-Module ActiveDirectory $dcs = Get-ADComputer -Filter {DistinguishedName -Like "*Domain Controllers*"} I get no results for this query. Alternatively, could someone suggest a way using the module above that I can generate a list of systems on my domain that are NOT Domain Controllers (which is what I'm eventually trying to achieve). Cheers

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  • How to Move Offline Files Cache in Windows 7?

    - by Portman
    On Vista systems, I've been using these instructions to relocate the "Offline Files Cache" from its default location of c:\csc. Works great. However, these instructions do not work on Windows 7. There is small discussion about the issue going on on TechNet but nobody yet has a solution. The problem is that the Migration Wizard has changed in Windows 7 and no longer provides a mechanism for doing this.

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  • Sysadmin Dress Code

    - by andyh_ky
    What kind of dress code do you have at work as a systems administrator? Business casual, casual, some days casual, some days business casual, formal? It's safe to say "it all depends on the type of day we're planning on having" - but what happens if you need to speak to some C level personnel? Do you have a spare set of clothes?

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  • Transpose matrix-style table to 3 columns in Excel

    - by polarbear2k
    I have a matrix-style table in excel where B1:Z1 are column headings and A2:A99 are row headings. I would like to convert this table to a 3 column table (column heading, row heading, cell value). It does not matter in what order the new table is. A B C D A B C A B C 1 H1 H2 H3 1 H1 R1 V1 1 H1 R1 V1 2 R1 V1 V2 V3 => 2 H1 R2 V4 or 2 H2 R1 V2 3 R2 V4 V5 V6 3 H1 R3 V7 3 H3 R1 V3 4 R3 V7 V8 V9 4 H2 R1 V2 4 H1 R2 V4 5 H2 R2 V5 5 H2 R2 V5 6 H2 R3 V8 6 H3 R2 V6 7 H3 R1 V3 7 H1 R3 V7 8 H3 R2 V6 8 H2 R3 V8 9 H3 R3 V9 9 H3 R3 V8 I've been playing around with the OFFSET function to create the whole table but I feel like a combination of TRANSPOSE and V/HLOOKUP is required. Thanks EDIT I have managed to come up with the correct formulas. If the data is in Sheet1 like in my example above, the formulas go in Sheet2: [A1] =IF(ROW() <= COUNTA(Sheet1!$B$1:$Z$1)*COUNTA(Sheet1!$A$2:$A$99), OFFSET(Sheet1!$A$1,0,IF(MOD(ROW(),COUNTA(Sheet1!$B$1:$Z$1))=0,COUNTA(Sheet1!$B$1:$Z$1),MOD(ROW(),COUNTA(Sheet1!$B$1:$Z$1)))),"") [B1] =IF(ROW() <= COUNTA(Sheet1!$B$1:$Z$1)*COUNTA(Sheet1!$A$2:$A$99),OFFSET(Sheet1!$A$1,IF(MOD(ROW(),COUNTA(Sheet1!$A$2:$A$99))=0,COUNTA(Sheet1!$A$2:$A$99),MOD(ROW(),COUNTA(Sheet1!$A$2:$A$99))),0),"") [C1] =IF(ROW() <= COUNTA(Sheet1!$B$1:$Z$1)*COUNTA(Sheet1!$A$2:$A$99),OFFSET(Sheet1!$A$1,IF(MOD(ROW(),COUNTA(Sheet1!$A$2:$A$99))=0,COUNTA(Sheet1!$A$2:$A$99),MOD(ROW(),COUNTA(Sheet1!$A$2:$A$99))),IF(MOD(ROW(),COUNTA(Sheet1!$B$1:$Z$1))=0,COUNTA(Sheet1!$B$1:$Z$1),MOD(ROW(),COUNTA(Sheet1!$B$1:$Z$1)))),"") The formulas are limited to B1:Z1 for the headings and A2:A99 for the rows (these can be increased to their maximums if required). The COUNTA() formula returns the number of cells that actually have values, which limits the number of rows returned to headings*rows. Otherwise the formulas would could go on for infinity because of the MOD function.

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  • How to use AIM to communicate with a Google Talk user?

    - by altendky
    How do I allow someone that uses the AIM desktop client to chat with someone else using the Google Talk desktop client? Both systems are Windows XP. The trick is that I don't want to have them have to change clients. Long ago I used Trillian... then Pidgin and now Meebo. But these are not solutions to the question. Also note that the Google client is not the web gadget.

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  • Windows errors, how do I find root cause and fix it? Getting several errors

    - by Eric Martin
    My server is having issues and not responding to customer's https requests. I checked the event viewer and found several errors. These two are listed a couple of times: WINS encountered a database error. This may or may not be a serious error. WINS will try to recover from it. You can check the database error events under 'Application Log' category of the Event Viewer for the Exchange Component, ESENT, source to find out more details about database errors. If you continue to see a large number of these errors consistently over time (a span of few hours), you may want to restore the WINS database from a backup. The error number is in the second DWORD of the data section. And this one: An error occured while using SSL configuration for socket address 0.0.0.0:444. The error status code is contained within the returned data. SQL Server is not ready to accept new client connections. Wait a few minutes before trying again. If you have access to the error log, look for the informational message that indicates that SQL Server is ready before trying to connect again. [CLIENT: xxx.xxx.xxxx.xxx] I also found this in the event viewer but the computer has been restarted since this message and I have not seen it again. Configuring the Page file for crash dump failed. Make sure there is a page file on the boot partition and that is large enough to contain all physical memory. This is my virtual memory settings: I'm not familiar with WINS so I wasn't sure if that is where I start or how to resolve it. Is the WINS error causing the other problems or should I be looking somewhere else?

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  • Windows Vista: Folder options not working

    - by Thomas Matthews
    I'm running Windows Vista Service Pack 2. I have the Folder Options set to "Open each folder in the same window." (Organize | Folder Options | General). Each time I open a folder, it opens in a new window. How do I get it to open each folder in the same window? I have tried the following techniques with no success: 1. Expand number of MBAG entries in Registry. (The number is 40,000 now.) 2. Delete Bags and MBAG entries in Registry. (Rebooted machine after, still no success). 3. Change to "Open each folder in its own window". Saved, then changed back. 4. Under View tab, changed "Remember each folder's view settings": unchecked, Apply to Folders, checked, Apply to folders. 5. Applied application from Annoyances.org. Still no success. 6. Clicked on Reset Default Options, then OK. (Opening in same fold is a default option!) Still unsucessful. I want the folders to open in the same window, just like the options say.

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  • nginx server over https using up all available file handles

    - by mmr
    Hi all, So I have an nginx server that's working over https with Sinatra. When I try to download a jnlp file in a configuration that works fine over Mongrel and http (no s), the nginx server fails to serve the file with a 504 error. Subsequent checking of the logs states that this error is due to overflowing the available number of file handles, ie, "24: too many open files". Running sudo lsof -p <nginx worker pid> gets me a huge list of files, all looking like: nginx 1771 nobody 11u IPv4 10867997 0t0 TCP localhost:44704->localhost:https (ESTABLISHED) nginx 1771 nobody 12u IPv4 10868113 0t0 TCP localhost:https->localhost:44704 (ESTABLISHED) nginx 1771 nobody 13u IPv4 10868114 0t0 TCP localhost:44705->localhost:https (ESTABLISHED) nginx 1771 nobody 14u IPv4 10868191 0t0 TCP localhost:https->localhost:44705 (ESTABLISHED) nginx 1771 nobody 15u IPv4 10868192 0t0 TCP localhost:44706->localhost:https (ESTABLISHED) nginx 1771 nobody 16u IPv4 10868255 0t0 TCP localhost:https->localhost:44706 (ESTABLISHED) nginx 1771 nobody 17u IPv4 10868256 0t0 TCP localhost:44707->localhost:https (ESTABLISHED) nginx 1771 nobody 18u IPv4 10868330 0t0 TCP localhost:https->localhost:44707 (ESTABLISHED) nginx 1771 nobody 19u IPv4 10868331 0t0 TCP localhost:44708->localhost:https (ESTABLISHED) nginx 1771 nobody 20u IPv4 10868434 0t0 TCP localhost:https->localhost:44708 (ESTABLISHED) Increasing the number of files that can be opened is no help, because then nginx just blows right past that limit. And no wonder, it looks like it's in some kind of loop to pull all available files. Any idea what's going on, and how to fix it?

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  • Is there an IE8 setting or policy to make it work like IE7 with respect to persistent connections?

    - by Stephen Pace
    I am working with a commercial application running on XP using IIS 5.1. Periodically the application is returning an IIS error "There are too many people accessing the Web site at this time." This is caused by Microsoft artificially limiting the number of connections (10) under IIS 5.1 under Windows XP, but in this case, there is really only one user (albeit a few tabs open at a time). Microsoft suggests you can reduce the problem by turning off HTTP Keep-Alives for that particular web site: http://support.microsoft.com/kb/262635 If you use IIS 5.0 on Windows 2000 Professional or IIS 5.1 on Microsoft Windows XP Professional, disable HTTP keep-alives in the properties of the Web site. When you do this, a limit of 10 concurrent connections still exists, but IIS does not maintain connections for inactive users. I may do that; however, I'm worried about performance degradation. However, I also notice that IE8 appears to handle this differently than IE7. By default, IE6 and IE7 use 2 persistent connections while IE8 uses 6. Perhaps in this case IE8 itself is generating multiple connections in an attempt to be faster, but those additional connections are overwhelming the artificially limited IIS 5.1 on XP? Assuming that is the case, is there an Internet Explorer option, registry setting, or policy I can set to force IE8 to behave like IE7 with respect to persistent connections? I would not set this for all users, but for the small number of users that used this application, it might solve their intermittent problem until the application can be rehosted on Windows Server 2008. Thanks.

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  • Iptables: "-p udp --state ESTABLISHED"

    - by chris_l
    Hi, let's look at these two iptables rules which are often used to allow outgoing DNS: iptables -A OUTPUT -p udp --sport 1024:65535 --dport 53 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -p udp --sport 53 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT My question is: How exactly should I understand the ESTABLISHED state in UDP? UDP is stateless. Here is my intuition - I'd like to know, if or where this is incorrect: The man page tells me this: state This module, when combined with connection tracking, allows access to the connection tracking state for this packet. --state ... So, iptables basically remembers the port number that was used for the outgoing packet (what else could it remember for a UDP packet?), and then allows the first incoming packet that is sent back within a short timeframe? An attacker would have to guess the port number (would that really be too hard?) About avoiding conflicts: The kernel keeps track of which ports are blocked (either by other services, or by previous outgoing UDP packets), so that these ports will not be used for new outgoing DNS packets within the timeframe? (What would happen, if I accidentally tried to start a service on that port within the timeframe - would that attempt be denied/blocked?) Please find all errors in the above text :-) Thanks, Chris

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