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  • Rejecting new HTTP requests when server reaches a certain throughput

    - by Sam
    I have a requirement to run an HTTP server that rejects new HTTP requests (with a 503, or similar) when the global transfer rate of current HTTP responses exceeds a certain level. For example, if the web server is transferring at 98Mbps, and a new HTTP request arrives, we would want to reject this (as we couldn't guarantee a good speed). I've had a look at mod_cband for Apache, limit_req for nginx, and lighttpd's rate limiting features, but none of them seem to handle my (rather contrived, granted) use case. I should add that I'm open to using pretty much any web server, and am open to implementing this in iptables rules if someone can craft such a rule! (Refusing the TCP connection is fine, it doesn't have to respond with an HTTP 503). Any suggestions?

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  • When I auto-start Supervisord on boot, the [program:start_gunicorn] don't start

    - by Charlesliam
    The [program:start_gunicorn] is running with no error when I manually start supervisord with this setup. [program:start_gunicorn] command=/env/nafd/bin/gunicorn_start priority=1 autostart=true autorestart=unexpected user=nafd_it redirect_stderr=true stdout_logfile=/env/nafd/logs/gunicorn_supervisor.log stderr_logfile=/env/nafd/logs/gunicorn_supervisor_err.log I successfully run this init script for my supervisord. But when I used auto-start init script for supervisord the gunicorn is not running. ]# service gunicorn status gunicorn: unrecognized service What do I need to do to make the [program:start_gunicorn] run when using auto-start supervisord on boot? Here's my gunicorn config. /env/nafd/bin/gunicorn_start #!/bin/bash NAME="nafd_proj" DJANGODIR=/env/nafd/nafd_proj SOCKFILE=/env/nafd/run/gunicorn.sock NUM_WORKERS=1 DJANGO_SETTINGS_MODULE=nafd_proj.settings DJANGO_WSGI_MODULE=nafd_proj.wsgi echo "Starting $NAME as 'NAFD Web Server'" source /env/nafd/bin/activate export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE export PYTHONPATH=$DJANGODIR:$PYTHONPATH RUNDIR=$(dirname $SOCKFILE) test -d $RUNDIR || mkdir -p $RUNDIR cd /env/nafd/nafd_proj exec ../bin/gunicorn ${DJANGO_WSGI_MODULE}:application --bind=127.0.0.1:8001 \ --name $NAME \ --workers $NUM_WORKERS \ --log-level=debug \` Any idea is really appreciated.

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  • Connect iPad to windows 7 VPN

    - by Linuz
    My iPad keeps spitting out the error: "A connection could not be established to the PPP server." I am trying to connect it to a VPN I set up with Windows 7 as an incoming connection. On the iPad, I went into the VPN settings, added a new PPTP VPN with the following information Server: Windows 7 Computer's IP RSA SecurID: OFF Account: Account Username Password: Account Password Encryption Level: Auto Send All Traffic: ON Proxy: Off Now I know that it is making some connection to the Windows 7 Computer because whenever I intentionally put in the wrong VPN password on the iPad, it makes me put in the correct one before trying to connect again. All the ports are forwarded on my router for PPTP, and my Windows 7 Firewall is even off to try to get this to work. Any help would be greatly appreciated, thanks.

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  • Battery notification always showing 'xx% remaining' with Windows 7 on an acer Aspire 5590

    - by dindeman
    My battery level always shows up as something like 55% remaining or 63% remaining ...etc despite that it is in fact charging. Additionally it doesn't go any further than 80% remaining even if I keep it in charge forever. This leads me to a side annoying effect which is that I cannot proceed to install Windows 7 Service Pack 1 as its installer requires the laptop to be plugged with a power cord. My laptop is plugged with the power cord but because of the above issue (it doesn't display anything else than the xx% remaining) Windows thinks that the laptop is using its battery and that the power cord is disconnected. I have installed the original acer ePower Management tool that let you configure the power scheme... etc, I was hoping that this would help me circumvent the 80% issue but it doesn't.

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  • Find out the size of a .tar.gz archive in the terminal without unpacking

    - by Sven
    I have a 32GB .tar.gz archive and I'd like to know the size of the files if I unpack this compressed archive. I'd like to avoid unpacking the archive first and than use e.g. du. Is it also possible to find out the size of the contained files without unpacking the compressed archive (on a Linux and/or MacOSX system)? For another archive I know, that it also contains .tar.gz files. Is it also possible to calculate the size of the unpacked archives that are contained within an archive? (for example by setting a level to which the "unpacking" should be simulated?)

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  • Folders disappear every timeWindows XP starts up

    - by Reebz
    Whenever my Windows XP machine starts up, subfolders disappear from the first top-level folder, listed alphabetically (eg. from "C:\AA Backups"). The first time it happened I suspected user error (such as an unintentional delete or copy). But I then found it happens on every start-up, sometimes affecting huge numbers of files. Renaming the affected folder (eg to "ZZ Backups") just means that a different folder is affected the next time. Avast found no virus or malware that would seem to be responsible. The missing files are not visible to an undelete utility such as NTFSUndelete. Running "chkdsk/f" found no problems and did not fix the problem. File permissions also appear corrupted - a few files which should be accessible are missing "read" permission. What's happened to this machine?? Any ideas or reports of similar experiences would be most welcome.

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  • Mobile Intel 965 vs 4 Series chipset speed differences

    - by graham.reeds
    A client of ours is having a problem panning on a mapping application that we write on their panasonic toughbooks (CF-19's). One of their toughbooks the panning is fairly smooth while on the other it is really slow. Doesn't help that they have all the settings turned up, but I would of thought any reasonably new graphics card (even shared memory) would have more than adequate graphic speed. I am pretty sure that the graphic adapter is to blame, but I can't find anything out about either chipset (level of acceleration, non-problems, etc). All I get is the intel data sheets. The faster panning one is on the Mobile Intel 4 Series Express Chipset while the slower is on the Mobile Intel 965 Express Chipset. Is this expected? Does it sound like a driver problem? They both have the same amount of ram and same cpu.

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  • powershell indentation

    - by Steve B
    I'm writing a large script that deploys an application. This script is based on several nested functions call. Is there any way to "ident" the output based on the depth ? For example, I have : function myFn() { Write-Host "Start of myfn" myFnNested() Write-Host "End of myfn" } function myFnNested() { Write-Host "Start of myFnNested" Write-Host "End of myFnNested" } Write-Host "Start of myscript" Write-Host "End of myscript" The output of the script will be : Start of myscript Start of myfn Start of myfnNested End of myFnNested End of myFn End of myscript What I want to achieve is this output : Start of myscript Start of myfn Start of myfnNested End of myFnNested End of myFn End of myscript As I don't want to hardly code the number of spaces (since I does not know the depth level in complex script), how can I simply reach my goal ? Maybe something like this ? function myFn() { Indent() Write-Host "Start of myfn" myFnNested() Write-Host "End of myfn" UnIndent() } function myFnNested() { Indent() Write-Host "Start of myFnNested" Write-Host "End of myFnNested" UnIndent() } Write-Host "Start of myscript" Write-Host "End of myscript"

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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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  • CentOS 6 init script doesn't work properly

    - by user711643
    I'm setting up my ruby production server based on CentOS 6. I need a process called god (which is a process monitoring tool) to start at boot. I'm using an init script that I found here. Just as stated in the guide I ran: chkconfig --add god and then chkconfig --level 345 god on After this if I run "service god start|restart" everything works. It loads the available configurations and brings up the related processes (if they are not running). Problem is it doesn't work at boot. If I reboot the system, then I do "ps -aux | grep god". At this point "god" is running but apparently it didn't load the configuration files. If i run again service god restart, it loads everything without problems. What am I doing wrong?

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  • What's a fast way to copy a lot of files from an internal hard-drive to external (USB) storage?

    - by jonathanconway
    I have a large amount of data - about 500 GB - on the internal hard drive of a desktop PC. This includes music, videos, PDFs... you name it. I want to copy everything to an external USB hard drive (1.5 tb capacity). The desktop PC runs Ubuntu. To being with, I simply plugged in and mounted the hard drive and dragged the top-level folder onto the drive. It's started copying, but it seems to be proceeding very slowly. About 10 minutes later and it's only done about 500 MB. I'm sure this is slower than what I could achieve with less total data. So I'm wondering if there's a quicker way of doing this. Would it be better to copy it in portions of 500MB or so, rather than all at once?

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  • How can I send raw postscript to a remote printer via CUPS?

    - by Ash
    I have an ancient fax device with a printer interface that only accepts postscript level 1 documents formatted in a specific way. I only have access to this printer over the lpd:// protocol. I have some old documents from our previous system that work fine on our Unix machines, but they are altered somehow by CUPS when I use lp on our Linux system. The PDF files that end up in the print queue are significantly modified versions of the original, and although they still render in ghostscript, they don't do anything on the printer. I'm wondering if there's a way to tell CUPS "don't process this, just send it to the printer without modification", or whether there's a lpd client or procedure I could try?

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  • Learn Linux Command Line for Web Server Management [closed]

    - by Jonathan
    I've searched high and low for a good resource for learning the Linux command line. I've found a handful of separate resources, but none that really can assist in web server management. I'm currently learning through trial an error with 'man' pages, along with Google. I was just wondering if anyone had a solid resource that they used to learn, and would be willing to share it with me. Thanks so much for your time, I really appreciate it! EDIT: I have a few CentOS servers at current, and I know the basics, I'm just trying to get to a more advanced level.

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  • Is there a way to rsync in batches?

    - by Chris
    I have a huge chunk of data (11G) in a subversion repository that I'm using rsync to migrate to Alfresco, which lucene indexes new files as they hit the file system. I'm using a dav mount as a proxy to allow me to rsync. The issue I'm having is the indexing post-rsync is quite an expensive operation for such a huge chunk of data, so I was wondering whether there's a way I could logically separate the rsync into identically-sized batches (say 500MB each) so I could schedule them in cron. At the moment, I'm traversing the top level folders and taking the smallest ones across first, but once I'm done with those, the much larger sub-directories are going to be quite troublesome. Please let me know if you need any further info. Thanks in advance.

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  • Rails 2 and Ngnix: https pages can't load css or js (but will load graphics)

    - by Max Williams
    ADMISSION: i've posted this same question on stackoverflow, before realising it's probabaly better suited to superuser, but it kind of depends on the answer: If it turns out to be a problem in my nginx config, it's definitely superuser. If it turns out to be a problem in my Rails config (or code) then it's arguably stackoverflow. I'm adding some https pages to my rails site. In order to test it locally, i'm running my site under one mongrel_rails instance (on 3000) and nginx. I've managed to get my nginx config to the point where i can actually go to the https pages, and they load. Except, the javascript and css files all fail to load: looking in the Network tab in chrome web tools, i can see that it is trying to load them via an https url. Eg, one of the non-working file urls is https://cmw-local.co.uk/stylesheets/cmw-logged-out.css?1383759216 I have these set up (or at least think i do) in my nginx config to redirect to the http versions of the static files. This seems to be working for graphics, but not for css and js files. If i click on this in the Network tab, it takes me to the above url, which redirects to the http version. So, the redirect seems to be working in some sense, but not when they're loaded by an https page. Like i say, i thought i had this covered in the second try_files directive in my config below, but maybe not. Can anyone see what i'm doing wrong? thanks, Max Here's my nginx config - sorry it's a bit lengthy! I think the error is likely to be in the first (ssl) server block: server { listen 443 ssl; keepalive_timeout 70; ssl_certificate /home/max/work/charanga/elearn_container/elearn/config/nginx/certs/max-local-server.crt; ssl_certificate_key /home/max/work/charanga/elearn_container/elearn/config/nginx/certs/max-local-server.key; ssl_session_cache shared:SSL:10m; ssl_session_timeout 10m; ssl_protocols SSLv3 TLSv1; ssl_ciphers RC4:HIGH:!aNULL:!MD5; ssl_prefer_server_ciphers on; server_name elearning.dev cmw-dev.co.uk cmw-dev.com cmw-nginx.co.uk cmw-local.co.uk; root /home/max/work/charanga/elearn_container/elearn; # ensure that we serve css, js, other statics when requested # as SSL, but if the files don't exist (i.e. any non /basket controller) # then redirect to the non-https version location / { try_files $uri @non-ssl-redirect; } # securely serve everything under /basket (/basket/checkout etc) # we need general too, because of the email/username checking location ~ ^/(basket|general|cmw/account/check_username_availability) { # make sure cached copies are revalidated once they're stale add_header Cache-Control "public, must-revalidate, proxy-revalidate"; # this serves Rails static files that exist without running # other rewrite tests try_files $uri @rails-ssl; expires 1h; } location @non-ssl-redirect { return 301 http://$host$request_uri; } location @rails-ssl { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_read_timeout 180; proxy_next_upstream off; proxy_pass http://127.0.0.1:3000; expires 0d; } } #upstream elrs { # server 127.0.0.1:3000; #} server { listen 80; server_name elearning.dev cmw-dev.co.uk cmw-dev.com cmw-nginx.co.uk cmw-local.co.uk; root /home/max/work/charanga/elearn_container/elearn; access_log /home/max/work/charanga/elearn_container/elearn/log/access.log; error_log /home/max/work/charanga/elearn_container/elearn/log/error.log debug; client_max_body_size 50M; index index.html index.htm; # gzip html, css & javascript, but don't gzip javascript for pre-SP2 MSIE6 (i.e. those *without* SV1 in their user-agent string) gzip on; gzip_http_version 1.1; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; #text/html # make sure gzip does not lose large gzipped js or css files # see http://blog.leetsoft.com/2007/7/25/nginx-gzip-ssl gzip_buffers 16 8k; # Disable gzip for certain browsers. #gzip_disable "MSIE [1-6].(?!.*SV1)"; gzip_disable "MSIE [1-6]"; # blank gif like it's 1995 location = /images/blank.gif { empty_gif; } # don't serve files beginning with dots location ~ /\. { access_log off; log_not_found off; deny all; } # we don't care if these are missing location = /robots.txt { log_not_found off; } location = /favicon.ico { log_not_found off; } location ~ affiliate.xml { log_not_found off; } location ~ copyright.xml { log_not_found off; } # convert urls with multiple slashes to a single / if ($request ~ /+ ) { rewrite ^(/)+(.*) /$2 break; } # X-Accel-Redirect # Don't tie up mongrels with serving the lesson zips or exes, let Nginx do it instead location /zips { internal; root /var/www/apps/e_learning_resource/shared/assets; } location /tmp { internal; root /; } location /mnt{ root /; } # resource library thumbnails should be served as usual location ~ ^/resource_library/.*/*thumbnail.jpg$ { if (!-f $request_filename) { rewrite ^(.*)$ /images/no-thumb.png break; } expires 1m; } # don't make Rails generate the dynamic routes to the dcr and swf, we'll do it here location ~ "lesson viewer.dcr" { rewrite ^(.*)$ "/assets/players/lesson viewer.dcr" break; } # we need this rule so we don't serve the older lessonviewer when the rule below is matched location = /assets/players/virgin_lesson_viewer/_cha5513/lessonViewer.swf { rewrite ^(.*)$ /assets/players/virgin_lesson_viewer/_cha5513/lessonViewer.swf break; } location ~ v6lessonViewer.swf { rewrite ^(.*)$ /assets/players/v6lessonViewer.swf break; } location ~ lessonViewer.swf { rewrite ^(.*)$ /assets/players/lessonViewer.swf break; } location ~ lgn111.dat { empty_gif; } # try to get autocomplete school names from memcache first, then # fallback to rails when we can't location /schools/autocomplete { set $memcached_key $uri?q=$arg_q; memcached_pass 127.0.0.1:11211; default_type text/html; error_page 404 =200 @rails; # 404 not really! Hand off to rails } location / { # make sure cached copies are revalidated once they're stale add_header Cache-Control "public, must-revalidate, proxy-revalidate"; # this serves Rails static files that exist without running other rewrite tests try_files $uri @rails; expires 1h; } location @rails { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_read_timeout 180; proxy_next_upstream off; proxy_pass http://127.0.0.1:3000; expires 0d; } }

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  • Why is hosted storage so expensive?

    - by Mark Henderson
    There are many questions on Server Fault asking why server storage is so expensive. e.g. Why do I have to pay 50 bucks a month per extra gigabyte of storage or Our file server is always running out of space, why doesn't our sysadmin just throw an extra 1TB drive in there? These questions usually come from people who lack an understanding of how enterprise-level storage works and what influences the price. This question is designed to be the "question to end all questions" regarding the price of enterprise storage.

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  • Granting access to authzTo attribute

    - by bemace
    I'm trying to grant certain accounts auth access to their authzTo attribute in order to allow proxied authorization. I tried adding this ldif: dn: olcDatabase={-1}frontend,cn=config changetype: modify add: olcAccess olcAccess: {1}to authzTo by dn.children="ou=Special Accounts,dc=example,dc=com" auth - using the command ldapadd -f perm.ldif -D "cn=admin,cn=config" -W but got this error: modifying entry "olcDatabase={-1}frontend,cn=config" ldap_modify: Other (e.g., implementation specific) error (80) additional info: <olcAccess> handler exited with 1 using verbose output and turning up the debug level haven't given me any more clues. Can anyone see what I'm doing wrong?

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  • Web log files analyzer

    - by Peter Štibraný
    I already use Google Analytics on my page, but I'd like to get additional info from log files. I've looked at various packages during last days, but nothing impressed me so far. Some requirements: must work on log file level (I use apache combined logs, but can configure apache to produce other types of logs) can generate static reports (windows/linux) or use GUI (windows only) should be easy to add custom user agents, and rerun analysis if it can recognize installation of eclipse plugins from log, that would be big plus understands google serp position referer should not require two days to setup (awstats, I am looking at you) should be still under active developement (i.e. analog isn't good answer) preferrably free, or at not very expensive :-) Any good analyzers programs out there?

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  • High CPU Steal percentage on Amazon EC2 Instance

    - by Aditya Patawari
    I am experiencing high CPU steal percentage in a Amazon EC2 large instance. I know it means that my virtual CPU is waiting on the real CPU of the machine for time. My question is that what can I do to reduce this percentage and get maximum out of the CPU? Steal percentage is consistently at 20%. System load crosses 10 when this happens. I have checked memory and network and I am sure that they are not the bottleneck. Is that normal for such environment? Also are there any system level optimization techniques for reducing steal percentage form the virtual instance? avg-cpu: %user %nice %system %iowait %steal %idle 52.38 0.00 8.23 0.00 21.21 18.18

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  • What is name server of my domain, pointing to hosted site on Github Pages?

    - by nournia
    I've got one domain name and I want to set it up for my hosted site on Github Pages service. In the documentation this point is mentioned that If you are using a top-level domain like example.com, you must use an A record pointing to 204.232.175.78. But my domain registrar doesn't permit me to add a DNS Record. But only asks me to fill one table like this: Name Server (NS Record) Server Name ......... | Server IP ns53.parsihost.com | 94.232.173.52 ns2.parsihost.com | 206.223.171.254 I asked the registrar about this problem and they said to me "You must put Github's name server in those cells". So, what is the mapping from this table to DNS Records, and what is your advice for filling this kind of table?

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  • Unix file permission for groups

    - by GOPI
    I am working on HP Unix server. I have a directory in which users from different groups need to create files. And the users of a same group should have complete access to the files created by their group and only read access for the files created by other groups. I tried to set sticky bit for the directory thereby to restrict access for other groups. But I face the following problem. Created File1 from user1 of GroupA. When I tried to execute the 'rm' command from user2 of the same group GroupA, it doesn't allow as user2 is not the owner of the file. can setgid (at directory level) or other command help me to sort this issue?

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  • Strange Intermittent Background Sound in Windows 7

    - by NoCarrier
    Ok, this is very strange. Recently, i noticed that every 10-15 seconds, there would be this faint, annoying duh-dum sound coming out of my speakers. (hard to describe. sounds somewhat like the sound windows makes when you unplug a USB device, but not as pronounced and much quieter). I closed every app and ended as many processes as I could, but the sound persists. I look at the volume mixer and sure enough, when the sound occurs, there is a little spike in the level under "System Sounds". I haven't installed any hardware or software in the last several weeks. This started recently - completely out of the blue. Does anyone have any insight?

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  • Windows Software to Save Arbitrary Application State

    - by ashes999
    VM software does a great job of saving state when you "turn it off," allowing instant and immediate return to that previous state. Is there some application for Windows that allows me to do the same thing, for any arbitrary software? It would allow me to save/restore state, possibly via a shell command or button that it appends to every window. Edit: For clarity, there are two types of apps: those that save their own states, and those that save others' states. Those that save their own state are like Chrome, which on load, reloads the windows you had open last time. That's not what I'm asking about; I'm asking for an app that can save the state of other apps, kind of like VM software does; but for any app. (A trivial test would be load notepad++, type a bunch of stuff, and save-state; on reset-state, you should be able to multi-level undo a lot of what you wrote, as if you never shut down the application.)

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  • No blocked ports on internal interface of ASA

    - by blsub6
    I have a cisco ASA 5505 with three interfaces: Internal (100), DMZ (50) and External (0). The internal has a IPSEC VPN tunnel to my internal network I couldn't log in to my domain because of all of the port restrictions and such. I tried monitoring the traffic through the interface, seeing what it's blocking and then unblocking those ports but even then it didn't work completely correctly I finally just added a rule to permit any ip traffic from any network to any network on the internal interface and, of course, it worked fine But is that good security practice? Should I be blocking ports on an interface that's internal and over a VPN with the highest security level?

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  • IIS7 Rewrite rule being duplicated across 2 different websites (unwanted)

    - by Matt
    We have a IIS7 on Windows Server 2008. It is hosting a handful of sites, on a handful of ip addresses. 2 of those sites are actually wildcards on the domain: *.firstdomain.com *.seconddomain.com However, I am finding that any URL Rewrite rules I add for one of these "websites", is automatically in the URL Rewrite section for the other. Similarly, if I disable the rule in in one, it disables in the other. This doesn't happen with the other sites defined on this server, just these two. I look at the parent (top level, the server as a whole), and the rule is not there. Any idea what's going on here?

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