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  • How would I recognize the "spoon-feeding problem" on a dynamic webapp server?

    - by Don Spaulding
    The "spoon-feeding problem", as it was recently explained to me, happens when connections to your application server are tied up feeding data across slow network connections to your clients. This makes sense to me and now I understand the importance of putting a highly-concurrent proxy in front of my app servers. My question is, how did the first person to recognize this problem figure it out? What *nix tools and troubleshooting techniques would help me to recognize this problem if I hadn't had it explained to me?

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  • How to combine AWS and dedicated external servers?

    - by rfw21
    I have an extensive network of servers all currently hosted on AWS EC2. For reasons of cost I plan to gradually migrate to dedicated servers where possible. So: How can I best combine AWS and non-AWS servers in my network? Ideally, I should be able to assign internal IP addresses to the external servers, include them in AWS security groups and ensure that all private traffic between my AWS servers and external servers is secure.

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  • Can I associate my spare Elastic IP addresses to an Amazon EC2 instance started in an Autoscale group and Monitoring?

    - by undefined
    I want to know if I can reserve a number of Amazon Elastic IP addresses and assign them to instances started by Autoscale. So basically, when a new instance is started because a trigger has been triggered can I also set the API to look for a spare IP address and allocate it to the instance. I need to do this because the started instance will need to communicate to a server outside the cloud and get through a firewall which will only allow remote access from a predefined set of IP addresses. So i think i need to reserve some IPs, add them to my firewall settings then allocate them (automatically) when a new instance is started. Any ideas?

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  • How to access XAMPP virtual hosts from iPad on local network?

    - by martin's
    Using XAMPP on one machine. Multiple virtual hosts defined. One per project. Format is .local For example: apple.local microsoft.local client-site.local our-own-internal-site.local All works perfectly from that one machine. I now want to have other systems within the network access the various sites. The main reason for wanting to do this is to be able to test site functionality and layout from mobile devices without having to upload partial work to public servers. I can access the main XAMPP default site by simply entering the IP address of the XAMPP machine in, say, Safari on an iPad. However, there is no way to reach .local that I can see. Would this entail setting up a DNS server within the network? We have a mixture of Windows and Mac machines. No Linux. The XAMPP machine is Vista 64. I don't want real external internet access to be affected in any way, just ".local" pointed to the XAMPP machine if that makes sense.

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  • How can the shared hosting server provide unlimited physical subdomains as opposed to unlimited virtual subdomains?

    - by xport
    Some hosting companies offer unlimited subdomains. There are two kind of subdomains: physical subdomains and virtual subdomains. A physical subdomains has its own site directory rather than being nested inside the site directory of its parent domain. A virtual subdomain site directory, on the other hand, is nested inside the site directory of its parent domain. I wonder how can the shared hosting company provide unlimited (theoritically) physical subdomains? In my understanding, each physical subdomain represents a new site (rather than a new application or virtual directory) in IIS. Please correct me if my mental model is wrong.

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  • What kind of hosting do I need? [closed]

    - by Robert Smith
    I have been trying to answer this question but I haven't found an specific answer to my situation. As I want to pay for what I need, I thought I could get a good answer here. I have custom made forum (rather than a built-in forum like the ones you can find as plugins, e.g. WP-Forum or phpBB type of software) in Django. I don't want to use Apache and modwsgi because it's usually very memory-hungry and I can't afford a big server. I prefer a combination of nginx and gunicorn which I think is very efficient (maybe you can also tell me what you think about that). I'm expecting to receive 10,000 to 20,000 visits each month with 15,000 to 30,000 page impressions. I have reviewed some cloud services like Amazon EC2 or Rackspace and other more traditional services (Linodo). This site won't use videos or big images and I certainly don't need a huge amount of bandwidth (200GB would be definitely too much). I need shell access so shared hosting is out of the question. What do I need to run a website like that without problems? What about RAM? 256MB would be enough (that's the amount of RAM offered by small instances in Amazon and Rackspace)? Do you know of any alternative to those I mentioned? If you need more information to provide a useful answer, please don't hesitate to ask. Thanks a lot.

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  • iptables: Allow only HTTP access for web browsing

    - by user1448260
    Have a linux box, want it locked down but just be able to surf internet on it. Why is this script blocking http too? #!/bin/sh # # iptables -F # #Set default policies for INPUT, FORWARD and OUTPUT chains # iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # # Allow TCP connections on tcp port 80 # iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # # Set access for localhost # iptables -A INPUT -i lo -j ACCEPT # # List rules # iptables -L -v

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  • Separation of memory oriented process and CPU oriented process

    - by Jeevan Dongre
    I am develops guy working for an e-commerce company I am running my e-commerce application built using ruby on rails spree commerce. I am presently running 2 medium instances in the production. One is a high memory instance which has 3.8 RAM and single Core CPU and another one is high CPU instance which has Dual Core CPU. Basically AWS calls it has m1.medium and c1.medium instance respectively. My question is it possible to separate the processes according the cpu intense and memory intense? So that all the cpu intense process can be made run in high cpu instance and all the memory intense process can be made to run in the high memory instances. Is any tool available to identify those process. Kindly give me some heads up. Thank you

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  • virtual web folder served by PHP script

    - by Martin
    I am trying to configure my apache to be able to display (virtual) pages like: mywebpage.com/something1 mywebpage.com/something2 mywebpage.com/folder/something3 I would like these "somethingX" and "folder" folders to be only virtual, not physical directories. For a start it would be great to send all requests to mywebpage to one PHP script which will somehow receive the original path information (there is some SERVER array as far as I know) and call necessary PHP functions (so far I use addresses like mywebpage.com/index.php?page=blabla&otherparameters=values...). Is that possible? I am struggling with different combination, currently I am with following file in /etc/apache2/conf.d/something.conf (not working of course). What is the correct way to proceed? Thanks. <Location /myweb> SetHandler my-handler Action my-handler /srv/www/htdocs/myweb/product.php virtual </Location> My pages are in /srv/www/htdocs/myweb. I tried with Location, with Directory, with Action and SetHandler, with AddHandler... ;-) Some configurations were ignored, some caused "object not found" with nothing relevant in error log.

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  • web page does not display properly

    - by Akil
    Hi, I have problem with one my conputer, it does not display any website properly. The background clouds on some websites do not show up, the layout of some websites are not properly displayed. And it only happen to only one computer. OS: Windows XP IE: 7 (not working on either IE7 or IE 8) I have tried to add my website as trusted site still that site is not working properly. I also tried Internet Options Advanced ... Check Show images, smart image dithering, enable visual styles in button and controls on webwage. Is there anything else I could do to fix the problem? Any help is appreciated

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  • Run single php code using multiple domains

    - by Acharya
    Hi all, I have a php code/site at xyz.com. Now I want to run the same site using multiple domains means when somebody open domain1.com, domain2.com ,domain4.com, so on urls, it should run the code/side that is at xyz.com I know one way to do this. I can host all these domains to the server where xyz.com is hosted so all domains will point to same peace of code/site. n above solution i need to hosted the domains manually. Is there any other way to do this as I want to add domains dynamically? Thanks in advance!

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  • Do you have problems with fonts in FireFox on big screens ??

    - by red777
    The problem is only in FF on bigger screens than 17" ,sometimes bigger than 22" monitors . I don't know why this happens, usually the problem is reported on windows vista and windows 7. Yes, I try the ctrl + 0 ,but that doesn't work . Can someone look at that page http://redmoonstudio.eu and tell mi what happens ? The page is in test/development.

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  • backup aws ec2 to separate account

    - by Paul de Goede
    I want to backup my AWS snapshots to a completely separate AWS account for additional security (if my AWS credentials were acquired someone could delete all my snapshots and volumes). But I'm a bit stumped on how to do this. There doesn't seem to be a way to store a volume or snapshot in S3 such that another user could access that data in s3 and store it in a separate AWS account. Does anyone have any suggestions on how to acheive this? Thanks

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  • Conflicting ip routes with local table on attaching a virtual network interface

    - by user1071840
    I have an EC2 instance with these ip rules: $ sudo ip rule show 0: from all lookup local 32766: from all lookup main 32767: from all lookup default I can attach an elastic network interface to it with a private IP. Say the IP of my machine is 10.1.3.12 and the IP of the interface is 10.1.1.190. As soon as I attach the interface to my machine a new entry is added to the routing policy and local routing table: sudo ip rule show 0: from all lookup local 32765: from 10.1.1.190 lookup 10003 32766: from all lookup main 32767: from all lookup default $ sudo ip route show table local broadcast 10.1.1.0 dev eth3 proto kernel scope link src 10.1.1.190 local 10.1.1.190 dev eth3 proto kernel scope host src 10.1.1.190 broadcast 10.1.1.255 dev eth3 proto kernel scope link src 10.1.1.190 broadcast 10.1.3.0 dev eth0 proto kernel scope link src 10.1.3.12 local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 broadcast 10.1.3.255 dev eth0 proto kernel scope link src 10.1.3.12 broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1 local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1 local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1 broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1 I can send traffic to this ENI directly from a host that can have the same IP as the host the ENI is attached to. This is where the problem starts. I ran tcpdump on the port in question and saw multiple SYNs going to the ENI with src '10.1.3.12' and destination '10.1.1.190' but didn't see even a single ACK. In my understanding if ACKs were being sent from the ENI they'd have destination as 10.1.3.12 i.e. the same as the local machine's IP and such packets will now be routed as local packets matching local routing policy: local 10.1.3.12 dev eth0 proto kernel scope host src 10.1.3.12 I'd like to send all the packets originating from 10.1.1.190 (my ENI) to go back on the same interface i.e. eth3 in this case. Contents of the nee table 10003 are: $ sudo ip route show table 10003 default via 10.1.1.1 dev eth3 I think I can do the following: I don't know if its possible but probably decrease the priority of local table so the packets match the table 10003. Use iptables to mangle these packets and update the local table route to include the mark information But I'm not sure if these are the right approaches.

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  • how to check usage of a web site

    - by Raj More
    I have this community that wants me to join in. They claim to be a very active referral service community. I since referrals are private, I cannot gain access to the actual numbers. I wanted to review their site usage to see really how active they are. Where do I check up on their visitor usage?

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  • Where might I be having problems with making web server acessable (XAMPP)

    - by Erx
    I've installed XAMPP and it seems to be working - sort of. It will serve pages if I access it via http://localhost or 127.0.0.1 but not if I use the actual IP address I have. I thought it might be a firewall issue, so I turned off the firewall and the issue still remains. I don't have enough experience to know where to look next, so I thought I might get some advice here. Running on Vista. The error I'm actually getting it "Timed Out". I've had XAMPP running on this machine prior, but I've had to reinstall my OS/new hard drive ... and I can't seem to get it working.

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  • Serve web application error messages from Http server

    - by licorna
    I have nginx as a http server with tomcat as a backend (using proxy_pass). It works great but I want to define my own error pages (404, 500, etc.) and that they are served by nginx and not tomcat. For example I have the following resource: https://domain.com/resource which doesn't exist. If I [GET] that URL then I get a Not Found message from Tomcat and not from nginx. What I want is that every time Tomcat responds with a 404 (or any other error message) nginx sends itself a message to the user: some html file accessible by nginx. The way I have my nginx server configured is very easy, just: location / { proxy_pass http://localhost:8080/<webapp-name>/; } And I've configured port 8080, which is tomcat, as not accessible from outside this machine. I don't think that using different location directives in nginx configuration will work, because there are some resources that depend on the URL: https://domain.com/customer/<non-existent-customer-name>/[GET] Will always return 404 (or any other error message), while: https://domain.com/customer/<existent-customer>/[GET] Will return anything different from 404 (the customer exists). Is there any way of serving Tomcat (Application Server) error messages with Nginx (http Server)? To check the message sent by the proxy_pass directive and act upon it?

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  • Session cach and tmp folder error on cPanel Centos

    - by Danialzo
    One of my clients has come across multiple breakdowns in their websites with the following error PHP Code: Warning: session_start() [function.session-start]:open(/tmp/sess_1d6616afe1b8a0d91a8d9ec29254b453, O_RDWR) failed: No space left on device (28) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/index.php on line 177Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/currency.php on line 45&#65279;Notice: Error: Can't create/write to file '/tmp/#sql_4c5_0.MYI' (Errcode: 28) Error No: 1 They are experiencing this problem while: Nothing has been recently changed on the server tmp and other folders are occupied with not more than 10% of their total space The error come and goes I would really appreciate it if anyone could guide me through. Thanks in advance

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  • Beast / CRIME / Beach attack and stopping it

    - by user2143356
    I have read so much on all this but not entirely sure I understand what has gone on. Also, is this one, two or three problems? It looks to me like three, but it's all very confusing: Beast CRIME Beach It seems the solution may be to simply not use compression with HTTPS traffic (or is that just on one of them?) I use GZIP compression. Is that okay, or is that part of the problem? I also use Ubuntu 12.04 LTS Also, is non-HTTPS traffic okay? So after reading all the theory I just want the solution. I think this may be the solution, but can someone please confirm I have understood everything so I am not likely to suffer from this attack: SOLUTION: Use GZIP compression on HTTP traffic, but don't use any compression on HTTPS traffic

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  • Multi domain server with dedicated SSL's HA

    - by user3692800
    I am hosting a server with 150 domain names (websites), each of the ssl's requere dedicated IP address. So server windows 2008, with 150 IP addressees and 150 websites. I need to have high availability solution. So thinking setting up AWS but ELB will not be a solution... and max IP's I can get per instance is 12 addresses. So what can I do to have all 150 sites hosted on one instance and be HA with instance in different availability zone.

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  • Set web browser (or other program) to use specific network

    - by Will
    my PC is connected to 3 different networks: 2 different LAN connections and a VPN connection. when i am connected to the vpn, i cannot browse to the LAN intranet as the DNS is all going through the vpn and it cannot see the domains on the LAN. Is there a way to set firefox/chrome/etc to use a specific connection, so that i don't have to disconnect from vpn to get to the other intranets?

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