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• Is there a solution that lets Node.js act as an HTTP reverse proxy?

  - by Igor Zinov'yev

  Our company has a project that right now uses nginx as a reverse proxy for serving static content and supporting comet connections. We use long polling connections to get rid of constant refresh requests and let users get updates immediately. Now, I know there is a lot of code already written for Node.js, but is there a solution that lets Node.js act as a reverse proxy for serving static content as nginx does? Or maybe there is a framework that allows to quickly develop such a layer using Node.js?

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• How to invalidate nginx reverse proxy cache in front of other nginx servers?

  - by Olivier Lance

  I'm running a Proxmox server on a single IP address, that will dispatch HTTP requests to containers depending on the requested host. I am using nginx on the Proxmox side to listen to HTTP requests and I am using the proxy_pass directive in my different server blocks to dispatch requests according to the server_name. My containers run on Ubuntu and are also running a nginx instance. I'm having troubles with caching on a particular website that is fully static: nginx keeps on serving me stale content after files updates, until I: Clear /var/cache/nginx/ and restart nginx or set proxy_cache off for this server and reload the config Here's the detail of my configuration: On the server (proxmox): /etc/nginx/nginx.conf: user www-data; worker_processes 8; pid /var/run/nginx.pid; events { worker_connections 768; # multi_accept on; use epoll; } http { ## # Basic Settings ## sendfile on; #tcp_nopush on; tcp_nodelay on; #keepalive_timeout 65; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; client_body_buffer_size 1k; client_max_body_size 8m; large_client_header_buffers 1 1K; ignore_invalid_headers on; client_body_timeout 5; client_header_timeout 5; keepalive_timeout 5 5; send_timeout 5; server_name_in_redirect off; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_vary on; gzip_proxied any; gzip_comp_level 6; # gzip_buffers 16 8k; gzip_http_version 1.1; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; limit_conn_zone $binary_remote_addr zone=gulag:1m; limit_conn gulag 50; ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } /etc/nginx/conf.d/proxy.conf: proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_hide_header X-Powered-By; proxy_intercept_errors on; proxy_buffering on; proxy_cache_key "$scheme://$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=cache:10m inactive=7d max_size=700m; /etc/nginx/sites-available/my-domain.conf: server { listen 80; server_name .my-domain.com; access_log off; location / { proxy_pass http://my-domain.local:80/; proxy_cache cache; proxy_cache_valid 12h; expires 30d; proxy_cache_use_stale error timeout invalid_header updating; } } On the container (my-domain.local): nginx.conf: (everything is inside the main config file -- it's been done quickly...) user www-data; worker_processes 1; error_log logs/error.log; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; #tcp_nopush on; keepalive_timeout 65; gzip off; server { listen 80; server_name .my-domain.com; root /var/www; access_log logs/host.access.log; } } I've read many blog posts and answers before resolving to posting my own questions... most answers I can see suggest setting sendfile off; but that didn't work for me. I have tried many other things, double checked my settings and all seems fine. So I'm wondering whether I am not expecting nginx's cache to do something it's not meant to...? Basically, I thought that if one of my static files in my container was updated, the cache in my reverse proxy would be invalidated and my browser would get the new version of the file when it requests it... But I now have the sentiment I misunderstood many things. Of all things, I now wonder how nginx on the server can know about a file in the container has changed? I have seen a directive proxy_header_pass (or something alike), should I use this to let the nginx instance from the container somehow inform the one in Proxmox about updated files? Is this expectation just a dream, or can I do it with nginx on my current architecture?

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• Managing multiple reverse proxies for one virtual host in apache2

  - by Chris Betti

  I have many reverse proxies defined for my js-host VirtualHost, like so: /etc/apache2/sites-available/js-host <VirtualHost *:80> ServerName js-host.example.com [...] ProxyPreserveHost On ProxyPass /serviceA http://192.168.100.50/ ProxyPassReverse /serviceA http://192.168.100.50/ ProxyPass /serviceB http://192.168.100.51/ ProxyPassReverse /serviceB http://192.168.100.51/ [...] ProxyPass /serviceZ http://192.168.100.75/ ProxyPassReverse /serviceZ http://192.168.100.75/ </VirtualHost> The js-host site is acting as shared config for all of the reverse proxies. This works, but managing the proxies involves edits to the shared config, and an apache2 restart. Is there a way to manage individual proxies with a2ensite and a2dissite (or a better alternative)? My main objective is to isolate each proxy config as a separate file, and manage it via commands. First Attempt I tried making separate files with their own VirtualHost entries for each service: /etc/apache2/sites-available/js-host-serviceA <VirtualHost *:80> ServerName js-host.example.com [...] ProxyPass /serviceA http://192.168.100.50/ ProxyPassReverse /serviceA http://192.168.100.50/ </VirtualHost> /etc/apache2/sites-available/js-host-serviceB <VirtualHost *:80> ServerName js-host.example.com [...] ProxyPass /serviceB http://192.168.100.51/ ProxyPassReverse /serviceB http://192.168.100.51/ </VirtualHost> The problem with this is apache2 loads the first VirtualHost for a particular ServerName, and ignores the rest. They aren't "merged" somehow as I'd hoped.

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• Oracle Outsourced Repair Solution: The “Control Tower” for the Reverse Supply Chain

  - by John Murphy

  By Hannes Sandmeier, Vice President of cMRO and Depot Repair Development Smart businesses are increasing their focus on core competencies and aggressively cutting costs in their supply chains. Outsourcing repairs can enable a business to focus on what they do best and most profitably while delivering top-notch customer service through partners that specialize in reverse logistics and repair. A well managed “virtual service organization” can deliver fast turn times, lower costs and high customer satisfaction. A poorly managed partner network can deliver disaster for your business. Managing a virtual service organization requires accurate, real-time information and collaboration tools that enable smart, informed and immediate corrective action. To meet this need, Oracle has released the Oracle Outsourced Repair Solution to provide the “control tower” for managing outsourced reverse supply chain operations from customer complaint through remediation to partner claim settlement. The new solution provides real-time visibility to return status, location, turn time, discrepancies and partner performance. Additionally, its web portals allow partners and carriers to view assigned work, request parts, enter data, capture time and submit claims. Leveraging the combined power of Oracle E-Business Suite and Oracle E-Business Suite Extensions for Oracle Endeca, the Oracle Outsourced Repair Solution provides a comprehensive set of tools that range from quick online partner registration to partner claim reconciliation, from capturing parts and labor to Oracle Cost Management and Financials integration, and from part requisition to waste and hazmat controls. These tools empower service operations managers to: · Increase customer satisfaction Ensure customers are satisfied by holding partners accountable for the speed and quality of repairs, and taking immediate corrective action when things go wrong · Reduce costs: Remove waste from the repair process using accurate job cost and cost breakdown data · Increase return velocity: Users have the tools to view all orders in flight and immediately know the current location, status, owner and contact point for repairs so as to be able to remove bottlenecks, resolve discrepancies and manage escalations The Oracle Outsourced Repair Solution further demonstrates Oracle’s commitment to helping supply chain professionals and service managers deliver high customer satisfaction at the lowest cost. For more information on the Oracle Outsourced Repair Solution, visit here. 

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• Refactoring this code that produces a reverse-lookup hash from another hash

  - by Frank Joseph Mattia

  This code is based on the idea of a Form Object http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/ (see #3 if unfamiliar with the concept). My actual code in question may be found here: https://gist.github.com/frankjmattia/82a9945f30bde29eba88 The code takes a hash of objects/attributes and creates a reverse lookup hash to keep track of their delegations to do this. delegate :first_name, :email, to: :user, prefix: true But I am manually creating the delegations from a hash like this: DELEGATIONS = { user: [ :first_name, :email ] } At runtime when I want to look up the translated attribute names for the objects, all I have to go on are the delegated/prefixed (have to use a prefix to avoid naming collisions) attribute names like :user_first_name which aren't in sync with the rails i18n way of doing it: en: activerecord: attributes: user: email: 'Email Address' The code I have take the above delegations hash and turns it into a lookup table so when I override human_attribute_name I can get back the original attribute name and its class. Then I send #human_attribute_name to the original class with the original attribute name as its argument. The code I've come up with works but it is ugly to say the least. I've never really used #inject so this was a crash course for me and am quite unsure if this code effective way of solving my problem. Could someone recommend a simpler solution that does not require a reverse lookup table or does that seem like the right way to go? Thanks, - FJM

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• multiple godaddy domains to home router then reverse proxy to multiple internal servers [closed]

  - by Dan

  I need someone to steer me correctly... advising on all required components. I have multiple domains with godaddy, say site1.com , site2.com, site3.net I have multiple home LAMP servers... one on say, lampsrv1 = 192.168.0.2:8080 (windows) and lampsrv2 = 192.168.0.3:9080 (linux srv2) I would like to have server1.site1.com point to lampsrv1 and server2.site1.com point to lampsrv2 . I may also want server1.site2.com also point to my lampsrv1 as an option. My thinking is - I have a dedicated linux srv1 with a reverse proxy server behind the router, ie Apache or NGINX or equivalent directing to appropriate LAMP server. It's the godaddy subdomains, cnames or redirections, etc I'm having a challenge with for starters... I have tested apache with virtual servers but can't get proxying to work based on host header info... seems to go to one address making me think its actually the apache reverse proxying that's not quite working. Finally to add to this, my router has a dynamic IP but does lease for quite a while but that would be my final piece. So, I'm sure this might be a popular question but can't seem to piece this together. I need someone who has actually configured this scenario to advise but will take other suggestions.... please indicate if you have successfully configured this.

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• Visio 2010 Reverse Engineer Oracle

  - by digitall

  I have used Visio 2007 in the past to reverse engineer Oracle databases to get a flow scheme. I believe all Office 2007 products were x86 as well which is where I suspect my issue currently lies. I have since upgraded to Visio 2010 x64 and when I go to reverse engineer something from Oracle it shows up under Installed Visio Drivers but I can't seem to create a data source using it. My assumption here is it is because Oracle doesn't play nicely with x64 and with Visio being compiled as x64 I don't even get the option to use it. Has anyone done this with Visio 2010 x64 and Oracle yet? Or are there other tools you would recommend to reverse engineer and get a model such as the one generated by Visio?

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• Setup Reverse DNS with Cpanel and WHM?

  - by m3d

  I needed to set-up a reverse DNS via cpanel. I followed the steps in this tutorial but it didn't work: http://docs.cpanel.net/twiki/bin/view/11_30/WHMDocs/RdnsForBind. I use my own name servers registered with go-daddy. But I am with VPS hosting company. I did use a new serial number and exactly as the tutorial however didnt seems to be working When I check this via windows nslookup {ip-address} I still get the my hosting company name, when reversed.

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• Reverse Auctions - Tips for Posting Successful Projects

  Reverse auction websites allow you to post a description of something you need to have done and receive multiple bids on it. The project can be any service you need, or even any item you want to buy.... [Author: Patrick Hesselmann - Computers and Internet - March 29, 2010]

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• remote control android, a reverse ssh tunnel

  <b>Handle With Linux:</b> "Reasons for using a reverse shell include: you can bypass firewalls, you can connect to your phone without knowing the ip, the connection is initiated from the phone so you don't need to have a ssh server listening on your phone. Just think of all the fun this makes possible!"

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• A Variety Of Ways To Use Reverse Email Search

  If you have not heard about reverse email search, you may be wondering exactly what you can use this service for. You can use this search to lookup an email address and find out who it belongs to. Th... [Author: Ed Opperman - Computers and Internet - April 10, 2010]

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• Enterprise Data Center System Admin/Engineer to Server Ratio

  - by Bob

  I know there have been similar questions asked over the last few months however looking at a Data Center Operations and know there are some really smart people out there that might be able to help. Looking for some staffing best practices based on first hand experience and was hoping that there is some experience in this area that can provide "best practice" application: Three High Availability (99.99% plus) Enterprise Level Data Centers geographically dislocated, one manned 24x7x365, one lights out, one co-location running HOT-HOT-HOT supporting a global community. More than 2,000 operating systems consisting of 95% Windows, 5% Linux and Solaris, 45% virtualized, more than 100TB storage. No desktop support, no Network Administration (administrated separately), running N+1 and serving more than 250 Billion page views annually. Based on experience what has been your experience with Server to "Data Center System Administrator/Engineer" ratio? Thanks in advance for your responses.

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• How would I setup reverse DNS for 2 email servers?

  - by Solignis

  I have an interesting DNS question (well interesting to me atleast). I just installed an hmail server in our remote office to act as an MX backup in the event our exchange server goes down. The 2 host names are mail.campbellsurvey.com mail2.campbellsurvey.com mail points to the address 98.XXX.91.XXX mail2 points to the address 70.XXX.190.XXX How would I setup a PTR record on the ISP end to reflect both hostnames? Does the PTR have to point to EXACTLY mail.campbellsurvey.com or can it point to just campbellsurvey.com? because right now anything passing through the primary static address in our pool (the one used for standard internet) is identified as mail.campbellsurvey.com. My only idea to fix this was to move the mail server to the next available address and give it only it the name mail.campbellsurvey.com but I wanted to see if there was another way. Thanks in advance.

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• Reverse rdesktop or VNC overlay image!

  - by carlesso

  Hi all. I've got a central server (linux based) and many clients (Windows XP Embedded, afaik) in public places around my country. I need to have these clients to connect to the server with a "reverse" tunnel, that is to say that I need to control the clients from the server but the connection is initialized by clients. The requirement is that, during the connection, an overlay image (or something like that, like a modified version of login screen) is displayed. Some stuff like "Work In Progress". My first idea was to use vncviewer -listen and vnc in reverse mode, but cannot understand how to obfuscate the work I'm doing. Other idea was to use rdesktop in "reverse" mode, but it seems it does not support it. Using rdekstop reverse seems the nicest solution (I can login back the user was in before connection, the login manager - which I can modified - is displayed), but any hint will be appreciated! Thanks in advance!

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• Something is wrong with this C code to reverse string, but I dont know what ? please help

  - by Harbhag

  Hi all, I am beginnner to programming. I wrote this little program to reverse a string. But if I try to reverse a string which is less than 5 characters long then it gives wrong output. I cant seem to find whats wrong. #include<stdio.h> #include<string.h> int main() { char test[50]; char rtest[50]; int i, j=0; printf("Enter string : "); scanf("%s", test); int max = strlen(test) - 1; for ( i = max; i>=0; i--) { rtest[j] = test[i]; j++; } printf("Reversal is : %s\n", rtest); return 0; }

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• how to add a REverse PTR Record on Amazon Route 53?

  - by Oscar Cabrero

  if i have the below ip 168.144.254.X and i would like to add a ptr record in amazon in the form of X.254.144.168.in-addr.arpa what should be in the name field and what should be in the value field i have a zone created with a name like mydomain.com which host the DNS records for my ip. amazon wont let me add a value of X.254.144.168.in-addr.arpa in the name field do i need to create a new zone for the ip in order to allow this?

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• How many reverse proxies (nginx, haproxy) is too many?

  - by Alysum

  I'm setting up a HA (high availability) cluster using nginx, haproxy & apache. I've been reading great things about nginx and haproxy. People tend to choose one or the other but I like both. Haproxy is more flexible for load balancing than nginx's simple round robin (even with the upstream-fair patch). But I'd like to keep nginx for redirecting non-https to https among other things right at the point of entry to the cluster. On the other hand, nginx is a lot faster for serving static contents and would reduce the load on the powerful apache which loves to eat a lot of RAM! Here is my planned setup: Load balancer: nginx listens on port 80/443 and proxy_forwards to haproxy on 8080 on the same server to load balance between the multiple nodes. Nodes: nginx on the node listens to requests coming from haproxy on 8080, if the content is static, serve it. But if it's a backend script (in my case PHP), proxy forward to apache2 on the same node server listenning on a different port number. Technically this setup works but my concerns are whether having the requests going through several proxies is going to slow down requests? Most of the requests will be PHP requests as the backends are services (which means groing from nginx - haproxy - nginx - apache). Thoughts? Cheers

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• Ubuntu Pound Reverse Proxy Load Balancing Based off active server load?

  - by Andrew

  I have Pound installed on a loadbalancer. It seems to work okay, except that it randomly assigns the backend server to forward the request to. I've put 1 backend machine under so much load that it went into using swap, and I can't even ssh into it to test this scenareo. I would like the loadbalancer to realize that the machine is overloaded, and send it to a different backend machine. However it doesn't. I've read the man page and it seems like the directive "DynScale 1" is what would monitor this, but it still redirects to the overloaded server. I've also put in "HAport 22" to the backend figuring since I can't ssh in, neither could the loadbalancer and it would consider the backend server dead until it gets rid of the load and responds, but that didn't help either. If anyone could help with this, I'd appreciate it. My current config is below. ###################################################################### ## global options: User "www-data" Group "www-data" #RootJail "/chroot/pound" ## Logging: (goes to syslog by default) ## 0 no logging ## 1 normal ## 2 extended ## 3 Apache-style (common log format) LogLevel 3 ## check backend every X secs: Alive 5 DynScale 1 Client 1200 TimeOut 1500 # poundctl control socket Control "/var/run/pound/poundctl.socket" ###################################################################### ## listen, redirect and ... to: ## redirect all requests on port 80 to SSL ListenHTTP Address 192.168.1.XX Port 80 Service Redirect "https://xxx.com/" End End ListenHTTPS Address 192.168.1.XX Port 443 Cert "/files/www.xxx.com.pem" Service BackEnd Address 192.168.1.1 Port 80 HAport 22 End BackEnd Address 192.168.1.2 Port 80 HAport 22 End End End

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• Code understanding, reverse engineering, best concepts and tools. Java.

  - by core07

  One of most demanding tasks for any programmer, architect is understanding other's code. E.g. I am contractor, hired to rescue some project very quickly. Fix bugs, plan global refactoring and therefore I need most efficient way to understand the code. What is the list of concepts, their priority and best tools for this? Of what I know: reverse code engineering to create object models (creating of diagram per package is not so convenient), create sequence diagrams (the tool connects in debug mode to the system and generates diagrams from runtime). Some visualizing techniques, using some tools to work not just with .java but also with e.g. JPA implementors like Hibernate. Generate diagram for not all the codebase, but add some class and then classes used by it. Is Sparx Enterprise Architect state of the art in reverse engineering or far from that. Any other better tools? Ideally would be that tool makes me understand the code as if I wrote it myself :)

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• Nginx Reverse Proxy : post_action if proxy cache hit - Possbile?

  - by anonymous-one

  We have recently found out about nginxes post_action. We were wondering it there was a way to use this directive if a proxy cache hit is made? The flow we were hoping on is as follows: 1) User request comes in 2) If cache HIT goto A / If cache MISS goto B A) 1) Serve Cached Result A) 2) post_action to another url on the backend B) 1) Server request from backend B) 2) Store result from backend Any ideas if this is possible via post_action? Thanks!

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• Int[] Reverse - What does this actually do?

  - by Jamie Dixon

  I was just having a play around with some code in LINQPad and noticed that on an int array there is a Reverse method. Usually when I want to reverse an int array I'd do so with Array.Reverse(myIntArray); Which, given the array {1,2,3,4} would then return 4 as the value of myIntArray[0]. When I used the Reverse() method directly on my int array: myIntArray.Reverse(); I notice that myIntArray[0] still comes out as 1. What is the Reverse method actually doing here?

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• What port should I use for my reverse proxy to Apache 2 from nginx?

  - by meder

  I have nginx setup as the defacto port 80. I want to setup django+mod_wsgi on Apache2. I'm worried if I leave Apache2 as 80 it will cause a conflict. Is it better to avoid the headache and change Apache to a different port? server { listen 80; server_name work.domain.org; access_log /www/work.domain.org/log/access.log; error_log /www/work.domain.org/log/error.log; location / { proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Magic-Header "secret"; client_max_body_size 10m; } }

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• Reverse Engineer Formula

  - by aaronls

  Are there any free programs or web services for reverse engineering a formula given a set of inputs and outputs? Consider if had 3 columns of data. The first two numbers are inputs, and the last one is an output: 3,4,7 1,4,5 4,2,6 The outputs could be produced with simply a+b, but there could be many formulas that would give the same result of course. I am talking about data without any error or deviation, and I think the formula would only need basic operations(divide, multiply, add, sutbract) and possibly use one of floor/ceiling/round.

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• How do I update my servers' domain name for Reverse DNS?

  - by Jeff

  I'm updating my mail servers' rDNS and I think I have it all figured out except for one thing. When I installed my OS (Debian Etch), the installer asked me to enter the "domain name". Is the "domain name" updated by using the hostname command? If so, which config file(s) are updated when using the hostname command? If not, how do I change my servers' domain name? My current /etc/hosts: 127.0.0.1 localhost 67.228.178.164 mrspock.example-old.com mrspock My current /etc/hostname: mrspock $ hostname -f mrspock.example-old.com I need to update hostname -f to be mrspock.example-new.com.

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• New Secure Website with Apache Reverse Proxy

  - by jtnire

  I wish to set up a new website that will be accessed by users using HTTPS. I think it is good practise to put the "real" web server in a seperate subnet, and then install an Apache Reverse Proxy in a DMZ. My question is, where should I put the SSL cert(s)? Should I a) Use a self-signed cert on the "real" web server, and a proper cert on the reverse proxy? b) Use 2 real certs on both the "real" web server and the reverse proxy? c) Don't use any cert on the "real" web server, and use a proper cert on the reverse proxy? I'd like to use a) or c), if possible. I also don't want anyone's browser complaining of a self-signed cert. Thanks

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