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• Unix apt-get doesnt download from nfs locaiton

  - by pravesh

  I have switched to unix from last 3 months and trying to understand install process and in particular apt-get. I am able to successfully install and download the packages when I configure my repository on http location in /etc/apt/sources.list file. e.g. deb http://web.myspqce.com/u/eng/rose/debian-mirror-squeeze-amd64/mirror/ftp.us.debian.org/debian/ squeeze main contrib non-free This command will download(/var/cache/apt/archive) and install the package when i use apt-get install When I change the source location to file instead of http(nfs mount point), the package is getting installed but NOT getting downloaded in /var/cache/apt/archive. deb file:/deb_repository/debian-mirror-squeeze-amd64/mirror/ftp.us.debian.org/debian/ squeeze main contrib non-free Please let me know if there is any configuration or settings that i have to make to let apt-get to both download and install package when i use (nfs)file:/ instead of http:/ in sources.list. To achieve this, I can use apt-get --downlaod-only and then use apt-get install for both download and install in two separate calls, but I want to know why package is not getting downloaded with apt-get install but only getting installed when used with file:/ in sources.list

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• Server 2008R2 Server Manager Roles and Features won't refresh or allow addition of new roles or features

  - by MattChorba

  I have a standalone DC in an isolated lab. I have installed the SUR tool and found no errors. I ran SFC and found no errors. I have attempted to install Windows Backup feature using Powershell, but received the same error about the computer needing to be restarted. Powershell cmdlets will list all of the installed roles and features. The rest of Server Manager works without problems. What can I do to get Server Manager Roles and Features working properly again? Picture of Error: CheckSUR.log: ================================= Checking System Update Readiness. Binary Version 6.1.7601.21645 Package Version 13.0 2011-11-28 13:20 Checking Windows Servicing Packages Checking Package Manifests and Catalogs Checking Package Watchlist Checking Component Watchlist Checking Packages Checking Component Store Summary: Seconds executed: 413 No errors detected (w) Unable to get system disk properties 0x0000045D IOCTL_STORAGE_QUERY_PROPERTY Disk Cache CheckSUR.persist.log: ================================= Checking System Update Readiness. Binary Version 6.1.7601.21645 Package Version 13.0 2011-11-28 13:20 Checking Windows Servicing Packages Checking Package Manifests and Catalogs Checking Package Watchlist Checking Component Watchlist Checking Packages Checking Component Store Summary: Seconds executed: 413 No errors detected (w) Unable to get system disk properties 0x0000045D IOCTL_STORAGE_QUERY_PROPERTY Disk Cache

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• Sending mails via Mutt and Gmail: Duplicates

  - by Chris

  I'm trying to setup mutt wiht gmail for the first time. It seems to work pretty well, however when I send a mail from Mutt i appears twice in Gmail's sent folder. (I assume it's also sent twice - I'm trying to validate that) My configuration (Stripped of coloring): # A basic .muttrc for use with Gmail # Change the following six lines to match your Gmail account details set imap_user = "XX" set smtp_url = "[email protected]@smtp.gmail.com:587/" set from = "XX" set realname = "XX" # Change the following line to a different editor you prefer. set editor = "vim" # Basic config, you can leave this as is set folder = "imaps://imap.gmail.com:993" set spoolfile = "+INBOX" set imap_check_subscribed set hostname = gmail.com set mail_check = 120 set timeout = 300 set imap_keepalive = 300 set postponed = "+[Gmail]/Drafts" set record = "+[Gmail]/Sent Mail" set header_cache=~/.mutt/cache/headers set message_cachedir=~/.mutt/cache/bodies set certificate_file=~/.mutt/certificates set move = no set include set sort = 'threads' set sort_aux = 'reverse-last-date-received' set auto_tag = yes hdr_order Date From To Cc auto_view text/html bind editor <Tab> complete-query bind editor ^T complete bind editor <space> noop # Gmail-style keyboard shortcuts macro index,pager y "<enter-command>unset trash\n <delete-message>" "Gmail archive message" macro index,pager d "<enter-command>set trash=\"imaps://imap.googlemail.com/[Gmail]/Bin\"\n <delete-message>" "Gmail delete message" macro index,pager gl "<change-folder>" macro index,pager gi "<change-folder>=INBOX<enter>" "Go to inbox" macro index,pager ga "<change-folder>=[Gmail]/All Mail<enter>" "Go to all mail" macro index,pager gs "<change-folder>=[Gmail]/Starred<enter>" "Go to starred messages" macro index,pager gd "<change-folder>=[Gmail]/Drafts<enter>" "Go to drafts" macro index,pager gt "<change-folder>=[Gmail]/Sent Mail<enter>" "Go to sent mail" #Don't prompt on exit set quit=yes ## ================= #Color definitions ## ================= set pgp_autosign

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• Computer crashes if left unattended AND running uTorrent, what could be?

  - by DiegoDD

  I have a weird problem in which, if I leave my computer unattended, AND I leave uTorrent open, downloading/seeding, the computer simply crashes after about 20 / 30 minutes (don't know exactly since if I leave it, and come back later, it has already restarted or has a BSOD.) If I leave the computer alone for undefined time WITHOUT uTorrent, nothing happens, and if I am constantly using the computer while using uTorrent, no problem either (I could be using it all day with uT open and it doesn't crash). So what could it be that the combination of those cases makes the computer crash? I have already checked the power management so the computer never enters stand by mode, sleep, hibernate, etc. (the only thing I do is turn off the display). A first guess is that maybe one of my external hard drives DO sleep or enters in a "low power" mode or something if I don't use the PC. but since uT is running MAYBE tries to use that drive, and makes it crash. Could that be possible? How to know for sure if the external drive does that, and to prevent it from doing so. Any more ideas of what may be causing that? Specs: Windows 7 Pro, 64-bit, 2 GB RAM. Latest version of uTorrent (although it has been happening for a while now). UPDATE: i just found out that uTorrent has Disk cache options ( preferences - advanced - disk cache ). I have no idea if that may be causing problems with my external drive, hence causing the crash.

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• VPS Memory Exchausted Even With Light Settings

  - by user101570

  Linux noob here. I have a 256MB VPS on Ubuntu 11.04 server and when I run "free -m" the result shows all memory being used (including the second line re: buffers/cache). I found this very strange, considering I only have 5 Apache processes running each chewing up about 20MB each. MYSQL is taking up 30MB. To my knowledge, and according to "top", I have no other memory hogs operating. Settings that may be relevant: PHP memory_limit = 32M MYSQL key_buffer = 16M Prefork MPM Maxclients = 10 So when I reviewed these settings, I naturally thought maxclients was too high, so I tried switching it to 5. Now not only does my memory still show as being 100% used, my website loads much, much slower, despite not getting any traffic aside from mine at the moment. I don't understand this. I thought a single Apache process handles all requests from a client received within the "KeepAliveTimeout" window, which I've set to 2 seconds. With my initial config. of 10 maxclients, my page load times are around .3ms, so a single process should handle that no problem, correct? So next I went to an extreme level of 1 for maxclients. My memory is still at 100% usage and my site loads painfully slow. I'm a noob at a complete loss here. According to the many tutorials I've read on basic server setup, I should be good to go. Help! Please! Edit: total used free shared buffers cached Mem: 256 256 0 0 0 0 -/+ buffers/cache: 256 0 Swap: 0 0 0

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• NginX & Munin - Location and error 404

  - by user1684189

  I've a server that running nginx+php-fpm with this simple configuration: server { listen 80; server_name ipoftheserver; access_log /var/www/default/logs/access.log; error_log /var/www/default/logs/error.log; location / { root /var/www/default/public_html; index index.html index.htm index.php; } location ^~ /munin/ { root /var/cache/munin/www/; index index.html index.htm index.php; } location ~\.php$ { include /etc/nginx/fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /var/www/default/public_html$fastcgi_script_name; } } but when I open ipoftheserver/munin/ I recieve a 404 error (when I request ipoftheserver/ the files on /var/www/default/public_html are listened correctly) Munin is installed and works perfectly. If I remove this configuration and I use this another one all works good (but not in the /munin/ directory): server { server_name ipoftheserver; root /var/cache/munin/www/; location / { index index.html; access_log off; } } How to fix? Many thanks for your help

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• Nginx + WordPress + HHVM: Why isn't Batcache working? Would Varnish help even more?

  - by javipas

  I've heard great things about HHVM, so I've setup a copy of WordPress blog (on another domain) with Nginx (with the Pagespeed module) and HHVM. Right now the benefits are obvious: on the same config, load times are between two and three times faster. I'm trying to speed up things a little bit, and I've also installed Memcached and Batcache. I've installed the memcached package, copied object-cache.php (Pastebin) onto the root folder of the WordPress blog, and after that I've installed the Batcache plugin and copied the advanced-cache.php (Pastebin) file onto the wp-content folder. Also, I've included the line define('WP_CACHE', true); in the wp-config.php file. It seems it doesn't work, though. If I quickly reload the page several times Batcache should show the cached page, but it doesn't. It's easy to check that by reloading (Cmd+R on Chrome on OS X) the page several times and then viewing the page's code. Under the <head> section I should see some batcache stats, but they aren't there. I wonder if someone could give me some hint on this. On a side note, I don't know if I could add some other component in order to help the performance be even better. I'm thing about Varnish, but I'm not sure if it's just useless and it's just another way to the same I'm currently doing. Any other component there? (I'll test CDN for images, minifying js, etc and some other tricks as well, but I'm talking from the server perspective).

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• dnsmasq Client TTL

  - by user548971

  I have a situation where my hosts file is constantly changing. Because of this I don't want clients to cache ip addresses resolved using the hosts file. Here is the command that starts dnsmasq for me: /usr/sbin/dnsmasq -K -R -y -Z -b -E -S 8.8.8.8 -l /tmp/dhcp.leases -r /tmp/resolv.conf.auto --stop-dns-rebind --rebind-localhost-ok --dhcp-range=lan,192.168.2.2,192.168.2.249,255.255.255.0,12h -2 eth0 In looking at this site: http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html I see that the -T option has this description: -T, --local-ttl=<time> When replying with information from /etc/hosts or the DHCP leases file dnsmasq by default sets the time-to-live field to zero, meaning that the requester should not itself cache the information. This is the correct thing to do in almost all situations. This option allows a time-to-live (in seconds) to be given for these replies. This will reduce the load on the server at the expense of clients using stale data under some circumstances. My command doesn't have the -T option. Do I need it or does dnsmasq default TTL to zero without it?

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• How can I measure actual memory usage from my running processes?

  - by NullUser

  I have two servers, server1 and server2. Both of them are identical HP blades, running the exact same OS (RHEL 5.5). Here's the output of free for both of them: ### server1: total used free shared buffers cached Mem: 8017848 2746596 5271252 0 212772 1768800 -/+ buffers/cache: 765024 7252824 Swap: 14188536 0 14188536 ### server2: total used free shared buffers cached Mem: 8017848 4494836 3523012 0 212724 3136568 -/+ buffers/cache: 1145544 6872304 Swap: 14188536 0 14188536 If I understand correctly, server2 is using significantly more memory for disk I/O caching, which still counts as memory used. But both are running the same OS and if I remember correctly, I configured both with the same parameters when they were installed. I did a diff on /etc/sysctl.conf and they are identical. The problem is, I am collecting memory usage and other metrics over a period of time, (eg: vmstat, iostat, etc.) while a load is generated on the system. The memory used for caching is throwing off my calculations on the results. How can I measure actual memory usage from my running processes, rather than system usage? Is used - (buffers + cached) a valid way to measure this?

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• How to download video from a website that uses flash player but

  - by TPR

  Possible Duplicate: Download Flash video file from any video site? Livestream.com seems to be using flash player to show both live streams and archived/recorded streams (meaning previously shown streams). I want to download the archived streams. I am assuming that it should be much easier to download archived video from the website compared to the live stream. Here is a sample video: http://www.livestream.com/copanamericana/video?clipId=pla_6f9f4d97-e48f-4b04-bcaa-18e281341b0f&utm_source=lslibrary&utm_medium=ui-thumb ^^ I am not interested in this particular video, just an example. Firefox plugins like DownloadHelper and all do not work. Any suggestions? If I look at the browsing cache, no matter what the website plays, all files have the same size! If I open them, of course no video gets played. So something clever/funny is going on with the flash player on livestream.com (yes, even the archives videos), so it is definitely not the same as downloading videos from youtube. However, ads played on livestream.com videos are properly stored in browser cache.

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• Javascript loading never completes on many sites

  - by Joe

  I recently moved country and have found that on many websites the page never finishes loading. In some cases, no content is ever displayed, but the loading will never time out. Loading Developer Tools in Chrome shows me that it is the Javascript files which never load. For example, this BBC article will never load compatability.js, though will load all the other JS files perfectly. Google Maps often fails to finish loading, meaning it's impossible to make searches. There seems to be no pattern to which files will fail to load (i.e. they don't come from the same CDN). I have tried Chrome, Safari and Firefox on OSX 10.8, and Chrome on my girlfriend's OSX 10.7. I have similar issues on the iPad. In many cases, if I can go to the mobile version of the page that seems to load fine. I have run the browsers in private mode, disabled plugins, updated flash, cleared the cache, flushed the DNS cache - though it would seem that if this is happening on other devices, none of this would work anyway. Is this an ISP issue? And if so, why would it be limited to certain JS files and not all? JS files from the same domain work fine, so I'm not really sure what I should be looking for.

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• New router, slower internet connection?

  - by qwerty

  So, we just bought a new router a few hours ago, and it does work. However, for some reason the speed is just ridiculously slow (compared to before, at least)! If i run a test on speedtest.net i get the following results: http://i.imgur.com/68JyH.png which are pretty good. But for some reason it's like the connection just "hangs" for a second when i navigate to a site through the browser (have tried different browsers). It's not on all sites, it kind of happens randomly. I think the browser cache might be speeding some sites up, because if i visit a site that i HAVEN'T visited before (since i cleared my cache), it takes like two seconds (if not more) to open the site. If i have visited it, it opens directly (it barely loads). Not sure what to do, really. Any suggestions on what might speed it up? Any settings i can play with in the router settings? The router is of the brand Belkin. I'm not sure about the model though, it says "Belkin, Play Max Wireless Router" on the box? Thanks in advance! EDIT: Alright, it takes a lot more than two seconds. At least 3-4 depending on the site. Any suggestions?

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• Servers - Buying New vs Buying Second-hand

  - by Django Reinhardt

  We're currently in the process of adding additional servers to our website. We have a pretty simple topology planned: A Firewall/Router Server infront of a Web Application Server and Database Server. Here's a simple (and technically incorrect) diagram that I used in a previous question to illustrate what I mean: We're now wondering about the specs of our two new machines (the Web App and Firewall servers) and whether we can get away with buying a couple of old servers. (Note: Both machines will be running Windows Server 2008 R2.) We're not too concerned about our Firewall/Router server as we're pretty sure it won't be taxed too heavily, but we are interested in our Web App server. I realise that answering this type of question is really difficult without a ton of specifics on users, bandwidth, concurrent sessions, etc, etc., so I just want to focus on the general wisdom on buying old versus new. I had originally specced a new Dell PowerEdge R300 (1U Rack) for our company. In short, because we're going to be caching as much data as possible, I focussed on Processor Speed and Memory: Quad-Core Intel Xeon X3323 2.5Ghz (2x3M Cache) 1333Mhz FSB 16GB DDR2 667Mhz But when I was looking for a cheap second-hand machine for our Firewall/Router, I came across several machines that made our engineer ask a very reasonable question: If we stuck a boat load of RAM in this thing, wouldn't it do for the Web App Server and save us a ton of money in the process? For example, what about a second-hand machine with the following specs: 2x Dual-Core AMD Opteron 2218 2.6Ghz (2MB Cache) 1000Mhz HT 16GB DDR2 667Mhz Would it really be comparable with the more expensive (new) server above? Our engineer postulated that the reason companies upgrade their servers to newer processors is often because they want to reduce their power costs, and that a 2.6Ghz processor was still a 2.6Ghz processor, no matter when it was made. Benchmarks on various sites don't really support this theory, but I was wondering what server admin thought. Thanks for any advice.

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• Stronger laptop_mode in Linux

  - by Vi

  Can I have stronger laptop mode in Linux? I want to spin down the hard drive and prevent it to spin up even if something wants to read something not in cache. In general I want to have these modes: Normal Current laptop mode Stronger laptop mode: spin up only when needs to read something uncached (and cache it). No spinups to write something unless really memory pressure (Exception: explicit "sync" command in console). Kernel is allowed to keep processes in D-sleep for 10 seconds for that. Forced laptop mode: do not spin up, period. Keep offending processes in D-sleep unless I turn off this mode. Like there is a bomb instead of hard drive. I also want to have access times tracked (mount -o atime), but I don't want the hard drive to be spinned up only to update them. Is there some settings or kernel patches that can get closer to this? May be I should write special io scheduler for "forced laptop mode"? E.g. echo suspend > /sys/block/sda/queue/scheduler to lock the drive and echo cfq > /ys/block/sda/queue/scheduler to unlock it again?

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• How to make Thunderbird play nice with Google mail

  - by Christi

  Thunderbird and gmail aren't exactly the best of friends. Gmail's tags mean that Thunderbird often downloads multiple copies of a single mail. Anything tagged in gmail will appear in a folder related to that tag, the "all mail" folder, and possibly the "inbox" and "sent mail" folders too. Thus a mail with multiple tags could potentially be stored more than four times in a local Thunderbird cache. This can make searching difficult, and is obviously wasteful of disk space. The best solution I have come up with is as follows. Operate a zero inbox policy (i.e. use the inbox for processing live mail only and archive everything else) which eliminates an extra copy in the inbox. Secondly, configure Thunderbird not to sync the "Sent Mail" folder - this is a bit of a pain, since I actually find it quite useful to be able to look through just the mails I've sent, but a search can duplicate this functionality. In this way, most of the duplicates are removed, and only mail with tags is stored locally more than once. Ideally, however, I'd only like one copy of each mail to be stored locally. I am surprised Thunderbird doesn't store mail by some sort of hashing algorithm to prevent precisely this problem - but it wouldn't be compatible with the way the folders are mirrored in a local directory structure, I suppose. Can anyone think of a better way to get Thunderbird to cache a Google mail account locally efficiently.

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• What I should know about memory management?

  - by bua

  first of all: I don't use stackadmin or similar so please don't vote for moving there, I'm reading man top and paper "what every programmer should know about memory ..." I need really simple explanation like for retard ;) Having following top dump: top - 11:21:19 up 37 days, 21:16, 4 users, load average: 0.41, 0.75, 1.09 Tasks: 313 total, 5 running, 308 sleeping, 0 stopped, 0 zombie Cpu(s): 0.4%us, 0.6%sy, 0.9%ni, 96.2%id, 0.1%wa, 0.0%hi, 1.9%si, 0.0%st Mem: 132103848k total, 131916948k used, 186900k free, 54000k buffers Swap: 73400944k total, 73070884k used, 330060k free, 13931192k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3305 tudb 25 10 144m 52m 940 R 6.0 0.0 1306:09 app 3011 tudb 15 0 71528 19m 604 S 3.3 0.0 171:57.83 app 3373 tudb 25 10 209m 93m 940 S 3.0 0.1 1074:53 app 3338 tudb 25 10 144m 47m 940 R 2.7 0.0 780:48.48 app 4227 tudb 25 10 208m 99m 904 S 1.3 0.1 198:56.01 app 8506 tudb 25 10 80.7g 49g 932 S 2.0 39.6 458:31.22 app I'm wondering what is: RES (my expl. physical memory consumption ? see 49GB) VIRT (memory mapped disk to cache? see 80GB) SHR (shared pages?) Swap: (is this cached label - for memory mapped disk into swap cache?) Should sum of RES give MEM: X used? or maybe sum of VIRT?

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• PHP Not Automatically Updating With ?reload=1

  - by user32007

  A friend built a ranking system on his site and I am trying to host in on mine via wordpress and godaddy. It updates for him but when I load it to my site, it works for 6 hours, but as soon as the reload is supposed to occur, it errors and I get a 500 timeout error. His page is at: jeremynoeljohnson .com/yakezieclub My page is currently at http://sweatingthebigstuff.com/yakezieclub but when you ?reload=1 it will give the error. Any idea why this might be happening? Any settings that I might need to change? Here is the top of the index.php file. I'm not sure which part of any of it is messing up. I literally uploaded the same code as him. Here's the reload part: $cachefile = "rankings.html"; $daycachefile = "rankings_history.xml"; $cachetime = (60 * 60) * 6; // every 6 hours, the cache refreshes $daycachetime = (60 * 60) * 24; // every 24 hours, the history will be written to - or whenever the page is requested after 24 hours has passed $writenewdata = false; if (!empty($_GET['reload'])) { if ($_GET['reload']== 1) { $cachetime = 1; } } if (!empty($_GET['reloadhistory'])) { if ($_GET['reloadhistory'] == 1) { $daycachetime = 1; $cachetime = 1; } } if (file_exists($daycachefile) && (time() - $daycachetime < filemtime($daycachefile))) { // Do nothing } else { $writenewdata = true; $cachetime = 1; } // Serve from the cache if it is younger than $cachetime if (file_exists($cachefile) && (time() - $cachetime < filemtime($cachefile))) { include($cachefile); echo ""; exit; } ob_start(); // start the output buffer ?

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• sporadic routing to another website when opening a common url

  - by user226098

  I have a strange problem in our office: Sometimes when opening a url from one of our projects random url in any browser not the right website shows up but some other website. In most of the cases it redirects to google.com with some parameters like https://www.google.de/?gfe_rd=cr&ei=krOOU8_kGcSKswadyYDQBw&gws_rd=ssl or just the ugly google 404 page). But today it remains on the origial url but shows up the the content of http://debug.netdna-cdn.com/. This happens about 1 time a week and for no apparent reason. Even stranger it only occurs on a single pc in the network. It now happens on two different computers in the network. Both use windows 8. The problem cannot be fixed by clearing the browser cache but by rebooting the pc or using ipconfig /flushdns. So I think it has something to do with the dns cache of the machine. But I have no idea what the reason is for this and how i can figure out how to solve it. Any ideas?

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• Performance-optimizing Oracle 10g on a server that is also a Tomcat JSP app server?

  - by PKHunter

  I have inherited a simple RedHat 5 - 64bit platform. It has SCSI disks on RAID1, with 16GB of RAM. Double Core CPU. Oracle 10g, Release 2. This would be a decent platform for running the DB only, perhaps, but the same server in an "A-A mode" clustering (very simple) also runs Tomcat and there are several Java servlets running on this. Sadly there is no caching platform etc. We only use an external CDN for some html caching. I am personally more familiar with web environments on the LAMPP platform (apache, php, mysql, postgresql). PROBLEM: Because the server has both Tomcat JSP/Java and Oracle 10g running on the same server, with no caching, I have some issues of the server going down. Often, sadly. QUESTION: What are my options in terms of improving performance of all these different apps? Connection Pooling? Example, in Postgresql world we have PgBouncer, which really helps things. Does Oracle have something similar? Or is there a famous Java-based external pooler that people use in production environments? (I'm not familiar with Java) Any "SQL cache" as in the MySQL and Postgresql world? Any other kind of application cache, as "APC" or "eAccelarator" in the PHP world? The "OSCache" stuff from the Java world (JSP thingie I found on Google: http://onjava.com/pub/a/onjava/2005/01/05/jspcache.html?page=2) ... What else? Sorry if this is a noob question. I have googled and googled, but problem is I don't know what to google for, other than the broad general concepts above. So if not full answers, I would even appreciate basic pointers and I am happy to JFGI myself. Thanks!

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• CentOS server. What does it mean when the total used RAM does not equal the sum of RES?

  - by Michael Green

  I'm having a problem with a virtual hosted server running CentOS. In the past month a process (java based) that had been running fine started having problems getting memory when the JVM was started. One strange thing I've noticed is that when I start the process, the PID says it is using 470mb of RAM while the 'used' memory immediately drops by over a 1GB. If I run 'top', the total RES used across all processes falls short of the 'used' listed at the top by almost 700mb. The support person says this means I have a memory leak with my process. I don't know what to believe because I would expect a memory leak to simply waste the memory the process is allocated not to consume additional memory that doesn't show up using 'top'. I'm a developer and not a server guy so I'm appealing to the experts. To me, if the total RES memory doesn't add up to the total 'used' it indicates that something is wrong with my virtual server set-up. Would you also suspect a memory leaking java process in this case? If I use free before: total used free shared buffers cached Mem: 2097152 149264 1947888 0 0 0 -/+ buffers/cache: 149264 1947888 Swap: 0 0 0 free after: total used free shared buffers cached Mem: 2097152 1094116 1003036 0 0 0 -/+ buffers/cache: 1094116 1003036 Swap: 0 0 0 So it looks as though the process is using (or causing to be used) nearly 1GB of RAM. Since the process (based on top is only using 452mb, does that mean that the kernal is all of a sudden using an additional 500mb?

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• Java games applet not connecting to Yahoo

  - by Steve

  Hi. I am trying to play a Y! game which use a java applet. The applet displays the message: Alert. Unable to connect to server. One of four things could have caused this: 1) You are behind a firewall. 2) You are not connected to the internet. 3) The games server is down. 4) You have a stale page in your cache. I have added an exception to the Windows firewall for java.exe. I am obviously connected to the Internet okay. The games server is not down when I am at home. I doubt it is down when I am at work. I have never successfully loaded this page before, so I doubt I have a stale page in cache. Could it be the corporate firewall? Nothing else in my web browser has been blocked before. Maybe the java applet connects on a different port to the browser. What should I test?

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• File exists but is unreadable by PHP

  - by Aron

  More than once I have ran into this issue: I have a cache file that is automatically generated by PHP. It contains some generated PHP code. However for some reason the file cannot be read and parsed by PHP. These are the symptoms: File actually exists on file system. Using Terminal you can navigate to the file, view its contents (which are fully intact), etcetc. PHP file_exists() will report that the file exists...which is correct since it does :) Then I include() the file. But when actually parsing the file, PHP will just consider it an empty file. No fatal error, just no PHP code actually executed. Again, its as if the file was completely empty (which I assure you, it is not)... It is not a permissions issue. Permissions are set as needed. Workaround: open the file in Terminal via 'nano' or some other text editor and just save it to the disk again. After that (despite no changes to the content) PHP will run it just fine... As a clarification, I'd like to add that this happens rarely, but frequently enough to be a problem. And even when it does, there are hundreds of other similar files on the same system that work without a problem... If this were an issue affecting only my own scripts, I would consider that there must be a bug in the way I generate the PHP code. But no, the issue has occurred more than once when deploying to a server (usually from Beanstalk repository via FTP). The issue has been present on various servers, Debian and Ubuntu running Zend Community Server. Any ideas? One that crossed my mind was opcode cache-ing (part of Zend Server CE)...could it be that an empty version of the file is cached if it is requested while the write operation is still in progress?

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• Why won't Google Chrome open Google Docs, and why is it slow with GMail?

  - by Philip

  OSX 10.6 Snow Leopard: Google Chrome works like a charm most of the time. I have many extensions installed, and I've tried disabling/re-enabling them one by one to find a culprit, with no luck. Here are the problems: (1) Chrome is slow to load GMail. I am fairly sure that clearing the cache alleviates this problem. But I can open Safari, type in the URL, and login to GMail in the time it sometimes takes Chrome to open the page. Shouldn't caching help the page load?!? And sometimes even after recent cache clears it still is slow to load..... Thoughts? (2) Chrome won't open Google Docs at all. Safari does. Again, I tried disabling extensions one-by-one, and I allow cookies and even third-party cookies. But I still am told it has a redirect loop. Any help would be much appreciated. Thanks!

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• How much free memory should I have on my webserver?

  - by neanderslob

  I have a webserver that's currently hosting two Wordpress sites and some java-based collaboration software. The server has 2G of memory and is currently using about 1.8G of the available memory. Right now what's on here is pretty much a pilot project that's getting negligible traffic so I think it's pretty clear that I'll be needing more memory. I was wondering, if I was to release it, how I might anticipate my memory needs based on the traffic it gets. I've poked around on Google and what I've found has been a bit tenuous. Is there a good heuristic that one should use when calculating memory demands as a function of the base (no traffic) load on the server? For reference, the output of free -m can be seen below: total used free shared buffers cached Mem: 2048 1832 215 0 0 0 -/+ buffers/cache: 1832 215 Swap: 0 0 0 To me this looks like actual memory used and isn't an illusion due to caching or anything else. I figure the demands of my collaboration software will have to be experimentally tested so here's free -m without that software running: total used free shared buffers cached Mem: 2048 1109 938 0 0 0 -/+ buffers/cache: 1109 938 Swap: 0 0 0 My plan B to figure this out is to add a bunch of swap space to the server, give it some traffic and adjust according the the amount that swap gets used. I was just wondering if anyone had a good rule of thumb to estimate how much memory I should plan on in advance...or if what I'm thinking is nuts. Many thanks in advance (I'm really quite new to this).

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• What are the best linux permissions to use for my website?

  - by Nic

  This is a Canonical Question about File Permissions on a Linux web server. I have a Linux web server running Apache2 that hosts several websites. Each website has its own folder in /var/www/. /var/www/contoso.com/ /var/www/contoso.net/ /var/www/fabrikam.com/ The base directory /var/www/ is owned by root:root. Apache is running as www-data:www-data. The Fabrikam website is maintained by two developers, Alice and Bob. Both Contoso websites are maintained by one developer, Eve. All websites allow users to upload images. If a website is compromised, the impact should be as limited as possible. I want to know the best way to set up permissions so that Apache can serve the content, the website is secure from attacks, and the developers can still make changes. One of the websites is structured like this: /var/www/fabrikam.com /cache /modules /styles /uploads /index.php How should the permissions be set on these directories and files? I read somewhere that you should never use 777 permissions on a website, but I don't understand what problems that could cause. During busy periods, the website automatically caches some pages and stores the results in the cache folder. All of the content submitted by website visitors is saved to the uploads folder.

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