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• Server downtime - are these APC warnings the cause?

  - by DisgruntledGoat

  Yesterday I had a problem with my dedicated server (Ubuntu 10.04, LAMP). It wasn't down per se, but running incredibly slowly as if we had a massive overload of visitors (though I don't think we did). It's running smoothly again now. I've been checking through log files etc to see if I can find any issues, the only strange thing is a bunch of these errors, occurring at about the same time as the downtime: [apc-warning] Unable to allocate memory for pool. in [file] on line 49. And a bit later on: [apc-warning] GC cache entry '[file1]' (dev=2056 ino=8988092) was on gc-list for 3601 seconds in [file2] on line 746. Could these errors indicate the cause of the server slowdown, or are they simply a result of the server being slow in the first place? What would be the solution?

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• Polling performance on shared host

  - by Azincourt

  I am planning on writing a small browser game. The webserver is a shared server, with no root / install possible. I want to use AJAX for client/server communication. There will be 12 players. So each player would be polling the server for the current game status every X milliseconds (let's say 200ms). So that would be 200ms x 12 players x 5 = 60 requests per second Can Apache handle those requests? What might be the bottlenecks when using this attempt?

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• How to color highlight text in a black/white document easily

  - by Lateron

  I am editing a 96 chapter book. The text is in normal black letters on a white background. What I want to be able to do is: I want to have any changes or additions automatically shown in another (per-selected) color. Without having to a)high lite a word or phrase to be changed or added and then b)going to the toolbar and clicking on the font color In other words I want the original color of the text to remain as it is and any additions or changes to be visible in another color without having to use the toolbar. Can this be done? I use OpenOffice or Word 2007 in Windows 7.

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• Are there any tools for monitoring individual Apache virtual hosts in real-time?

  - by Dave Forgac

  I'm looking for a way to monitor and record Apache traffic, separated by virtual host. I am currently using Munin to capture this and other data for the entire server however I can't seem to find a way to do this by vhost. This link describes using a module called mod_watch which is apparently no longer in development: http://www.freshnet.org/wordpress/2007/03/08/monitoring-apaches-virtualhost-with-munin/ The file that is listed as being compatible with Apache 2.x is reported to have problems with missing vhosts an reporting data correctly. Does anyone know of a reliable way to determine real-time traffic per vhost? If I can find this it should be easy enough to write a new Munin plugin.

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• Mount Docker container contents in host file system

  - by dflemstr

  I want to be able to inspect the contents of a Docker container (read-only). An elegant way of doing this would be to mount the container's contents in a directory. I'm talking about mounting the contents of a container on the host, not about mounting a folder on the host inside a container. I can see that there are two storage drivers in Docker right now: aufs and btrfs. My own Docker install uses btrfs, and browsing to /var/lib/docker/btrfs/subvolumes shows me one directory per Docker container on the system. This is however an implementation detail of Docker and it feels wrong to mount --bind these directories somewhere else. Is there a proper way of doing this, or do I need to patch Docker to support these kinds of mounts?

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• Common filesystem for servers behind a rackspace load balancer

  - by thanos panousis

  Our PHP application consists of a single web server that will receive files from clients and perform a CPU-intensive analysis on them. Right now, analysis of a single user upload can take 3sec to conclude and take 100% CPU. This makes our system capacity amount to 1/3 requests per second. My team's requirement is to increase capacity without a lot of code reengineering. A possible solution would be to set up a load balancer in front of multiple servers running the same app, connecting to a common DB. The problem is that the analysis outputs files on disk. A load balancer would increase capacity, but then files won't be available between servers so consequent client requests may fail. We are hosted on Rackspace, is there a way to configure some sort of "common" storage for all servers, without having to rewrite our file persistance code? Current code relies on simple fopens etc. What are our options?

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• Granting rights on postgresql database to another user

  - by Austin

  I'm trying to set up a system with a PostgreSQL database per user, with a PHP-FPM resource pool for an associated account. I need to grant all privileges on the database to the other user, but it seems that it's only possible to do this for tables. I've tried grant all privileges on database username to username_shadow but this gives only limited privileges. I've upgraded to PGSQL 9.2, which has the ability to grant privileges on schema, but I can't get a useful result. How do I simply make another user have all the privileges of the first on the same database?

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• Should I run my own MTA?

  - by Mascarpone

  I need to send a large volume of emails, roughly 60.000 per week. At the moment we outsource this service to a third party, and we expect to double our volume within the next 6 months. Since the service is starting to be too expensive, I was thinking about setting up our own MTA. Our own SysAdmin told us it is not difficult at all to have our own MTA, but I'm afraid he might have oversimplified this. Is it difficult to handle a MTA? Should I be afraid that my MTA will lose the company mails? Should I stay with a third party service? p.s: The emails have been collected respecting the local legislation on privacy, so no spam.

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• What is the formula for HughesNet FAP calculation?

  - by JohnFx

  I am somewhat frustrated with the only FAP monitor I have found on the net and discovered because it relies on a running count of bandwidth usage which (1) requires a service in the background; and (2) Tends to get inaccurate over time. Given that there is a diagnostics page on the firmware of the modem that tells the exact usage per hour, I was planning on writing a more accurate version with a better UI. However, it appears that HughesNet keeps the exact formula for calculating whether you are in FAP a secret. I have no idea why they wouldn't be more forthcoming with this information. Wondering if anyone out in SU-land had done some trial and error testing to reverse engineer the formula or had some inside knowledge to share.

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• sendmail new mail notification to external address only with the first unread email

  - by elcodedocle

  I'm running a webserver with a contact form which triggers a php script to sendmail the message to a local account on the server, and I want to be notified on my regular email account when I got new messages. I could have a notification per email or just send the emails directly to my account but that'd be too much: I just want a "you have new mail" notification sent to my email every time the inbox turns from 0 unread messages to 1. Google is burying me in sendmail documentation, and still can't find anything about it. Any ideas?

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• Print same text several time to one page

  - by RiaD

  I have a odt(or pdf, or ps) file. [Really I have odt, but I can easily convert it], it consist of 1 page. No I want to print it to another pdf 4 times to 1 page. There is an option pages per side, so If I copy-paste 4 times my document and set this option to 4 I'll have my expected result. But I want to do it without copy-paste because it's quite annoying to copy-and-paste before each printing. Is it simpler way?

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• How to disable Spotlight content indexing in Mac OS

  - by o.v.

  From Windows experience, I could always elect Live search to only index file names not their content. Is this something that can be done with Spotlight on a Mac? It used to index absolutely everything, for instance it would return a bunch of video files for any obscure character combination typed into the search field. Right now I've disabled Spotlight entirely as per this answer, but it seems to have disabled searching altogether. For instance, Finder is yet to locate any .pdf files in a small directory as I'm typing this question (unlike windows search which would still be able to work even with indexing disabled) Alternatively, if there is any way (including a trusted third-party app) that will index file names and metadata e.g. ID3 tags that would likely be the preferred option.

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• Preventing my postfix to send my local users spam

  - by Jack

  I have a postfix/dovecot mail server with 100 different users. When they send an email they need to be authenticated. I successfully use saslauth to achieve this. Few days ago I had a problem. One specific user, probably with a virus or a spam-bot installed in its computer, started to send out through my server thousands of emails in few hours. As result, my ip has been blocked by many isp provider (@aol, @yahoo, and others) and has been listed in many blacklist, making all my 100 users unable to send any email to anyone. What is the best practice to avoid this problem? It would be great if my server could recognize a spamming user and automatically block it. Also, have a limit of, say, 30 emails per hour could be a partial solution. Any idea how to face this problem? Thank you

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• Internet printing : print to iOS gateway -> AirPrint / something -> Laser printers

  - by user75129

  I've done a bit of research on the Internet, and it looks like I'm on a dead end. My goal is to minimize cost, and be able to send and print documents AUTOMATICALLY (may be 10 or 20 pages per day) to a laser printer in a remote office. The preliminary method is to use: iOS 5.1.1 (JB'ed) with 3G connection, HP (or other brands) printer with AirPrint, iCloud's Documents and may be write some launchd scripts to monitor any new documents in iCloud. May be with other software. I am not sure yet. By using the cloud, I can upload new docs to the cloud anywhere in my city, and the iOS will be able to see them within a reasonable amount of time, then print it. But it seems this combo is not workable. Anyone got any advice on how to make this set up work, or propose other alternatives that requires NO PC or Mac? Currently I have a 3GS with 3G connectivity spare. Need to buy a new printer though.

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• Is the sql backend right choice for LDAP?

  - by skomak

  Hi, I have felt some troubles with LDAP dif database after unexpected system reboots. This databse was only read so it is confused why database have had errors. So im searching for replacement of this database. I think SQL would be more reliable. What do you think, is it? I need to know how much performance loss i'll meet then. How many more IOPS(I/O per second) in percentage I loss too. Thanks in advance, skomak

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• Tests for hard drive health

  - by Samik R

  I have a 5-year old hard drive (bought new at the time), but it was sitting in my closet for 5 years, unused. I have just started using it, and seems to be getting a whirring sound (rather distinct from the other noises like fans etc.). I ran a few diagnostics tests, like Seagate's SeaTools, and the SMART test, and a few generic tests and all passed. Should I be concerned? Is there any other test that I should run? It's an internal IDE WD 5400RPM drive. Being used for a desktop, which is itself pretty high-end (AMD Phenom II X6 1100T, AMD Radeon GPU etc.), but would be used rather occasionally to begin with (avg. 1-2 hrs. per day). Thanks for any pointers.

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• Log incoming requests on Ubuntu (ports 80, 443)

  - by Maxim Eliseev

  We have Tomcat running on Ubuntu server. It runs a web service, open to the internet. Sometimes it has a sudden spike of traffic and goes down. There is nothing unusual in Tomcat access logs. I guess it is because some of the requests are so 'heavy' that they never finish and hence are not recorded to Tomcat access logs. Is there a way to configure Ubuntu to log incoming requests in the following format (below)? Date, Time, URL (with query string params), IP address (of client) There should be one line per request. Each request should be logged before it is executed. Only incoming requests to ports 80 and 443 should be logged.

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• 'Singleton' application - or let the user only launch one instance of a program at the time

  - by Disco

  I'm running a few linux desktops; mainly for kids (yeah, trying to teach them the right OS at early stage) (running Ubuntu 10.10, Gnome) The problem is that they found very funny to make their workstations (actually, old 512 Mb pentium 4) by launching thousands of firefox instances. I'm looking for a way to restrict them to launch 'N' instances of a particular application. Haven't figured yet how. Thought of a monitoring daemon but I think that would be too ressources hungry. Any idea of a script/trick to achieve this ? Note: i might have 1-2 level of users (the kids, and the more grown up kids) so i have also to limit per user; something like user1: 3firefox, user2: 2firefox instances.

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• Post raid5 setup reboot shows single hard drive failure on ubuntu 12.10?

  - by junkie

  I just set up raid 5 on linux using three HDDs as per a guide. It all went fine until when I rebooted I got the following text: http://i.stack.imgur.com/Zsfjk.jpg. Does this mean one of my HDDs has failed? How do I check if any of them are failing? I tried using smartctl and didn't see any issues. Or is it nothing to do with failure and something else altogether? I would like to get the raid 5 working again but I'm not sure where to go from here. I'm using ubuntu 12.10 and the three raid disks each have a gpt partition with a single full size partition of filesystem type ext4. Note I only got an error on reboot not while I was creating the raid array which went fine. Thanks.

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• Super slow time machine backup on my mac

  - by lowellk

  I just got a new 2TB drive which I'm trying to use as a time machine drive for my mac which has a 1TB drive. On my first time trying to back it up, I'm getting terrible throughput, not even 1GB per day (it's been running for 36 hours now). I erased the disk and tried to copy a large file to it and got the same slow speed. What can I do to diagnose this? Are there any tools which can inspect the disk and tell me if it's messed up? Thanks!

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• Bad IIS 7.5 performance on webserver

  - by Robert P.

  I have a webpage (ASP.NET 4.0 / MVC 4). On my development machine (i5-2500 3.3 8GB Win7 VS2010 SP1 Fujitsu Esprimo P700) the page performs with 160 requests/sec on devenv webserver on my machine. The page performs with 250 requests/sec on my local IIS 7.5. (uncompiled web) The page performs with 20 requests per second on a 16core 32gb ram production server (Fujitsu RX-300 w2k8 rc2 IIS 7.5). (compiled web) Why? I think it's the IIS configuration but i can't figure out whats the problem. The page runs with 1 worker process on both machines. Web garden is not an option (it helps but the app isnt compatible with)

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• Mouse Hang with voltage fluctuation

  - by user265495

  I bought a new assembled PC about a month ago, but for the past 7 or 8 days I found my mouse cursor hangs every time there is a voltage fluctuation on my UPS (I guess it as when sound comes from ups then mouse hang for 2 or 3 sec. and them it goes normal again). My PC also seems to shut down while I'm working and it refuses to boot again - I end up needing to switch off my UPS and press and hold the power button for 30 seconds. It will then boot as per normal. Could the trouble be with my PSU? Am I potentially damaging my computer by pressing and holding the power button? I have : Motheboard : intel Chipset Model - DH61WWAAG23116-303 Processor : Intel Core i3 3.20 Ghz RAM : Zion 4 gb DDR3 HDD : 1 tb GRAPHICS : 2 gb NVIDIA GeForce GT-610 CABINET : Frontech Rock OS : Win 7 32 Bit

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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• Mac OS 10.7 DMG files don't pop up anymore?

  - by Sosukodo

  Has anybody noticed that double-clicking on a DMG file no longer raises the mounted image to the front of all windows? It used to be that when you double-clicked a dmg file, it would pop-up but now you have to click Finder and click on the mounted image. Is this a bug, by design or a setting that I can change? Update: As per Daniel Beck's suggestion, I created a new account and downloaded the most recent version of Firefox via Safari. It still exhibited the same behavior. However, I noticed that if I double-click thew DMG from within the Downloads folder in Finder, it does pop up. But when I double-click the DMG within Safari (and Firefox also) it does not pop up over all other windows.

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• How are suspected DoS attacks handled by webservers?

  - by Jan Kuboschek

  I rent a server somewhere out in Canada or so that I'm using to host a website of mine. That website has close to 400,000 pages that I wanted to index today. For that, I wrote a crawler a while back (see JCrawler on Stackoverflow.com). Now, I'm greedy and didn't want it to take too long so I ran multiple threads resulting in some 60+ requests per second from my IP. A couple minutes later, my server locked me out. I can still FTP into it, but I can't HTTP it. As server administrator or user, do you have any idea how servers usually handle these situations? Is it common to place a permanent or temporary ban on the IP or what is typically done? Naturally, I'll re-run my software with fewer requests once I'm back on.

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