I'm looking to host a Python webapp on Heroku. The backend is written in different Java programs (the servers) and ZeroMQ is used for communication. If I deploy everything on Heroku (the servers just need to be running listening to requests), would they all run on the same LAN?
I'm asking because I don't want to run ZeroMQ over the internet, cause then I'll need something like SSH tunneling which I want to avoid.
Thanks!
Dynos do not share the same network. See this article on Heroku's website. This is by design for resiliance but you can choose the (Amazon) region that they all reside in.
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I am running a Flask application in digitalocean via a Gunicorn and NGINX set up.
I have SSH access to my digitalocean droplet and am able to log in via the terminal.
Gunicorn, NGINX and Flask are already running and this is a production server.
Now, I'd like to SSH into my droplet and run a terminal command in order to see a print out of any errors that occur from my Flask application. I guess it would gunicorn errors.
Is such a thing possible? Or would I have to print things out to an error log? If so, I'll probably have questions about how to do that too! :D
Thank you in advance!!
I
Have a look at this Digital Ocean tutorial for Flask, gunicorn and NGINX. It includes a section on logging obtaining logs at the end of section #5 that should be helpful.
A common approach with Cloud-based deployments is to centralize logs by aggregating them automatically from multiple resources e.g. Droplets to save ssh'ing (or scp'ing) to to machines to query logs.
With a single Droplet, it's relatively straightforward to ssh in to the Droplet and query the logs but, as the number of resources grows, this can become burdensome. Other Cloud providers provide logging-as-a-service solutions. With Digital Ocean you may want to look at alternative solutions. I'm not an expert but the ELK stack, Splunk and Datadog are often used.
I have an ASP.NET web application that has been hosted in IIS local Machine.
My Question is :
Is there any free or paid method that allows browsing this web
application from the internet as Host Server ?
Thanks
The easiest way to to publish it directly onto the internet. You do run the risk of attackers then being able to attach your machine, so you will need to brush up on your security skills. It might be worth looking into one of the free hosting options from AWS, Azure or Google Cloud.
To use your local machine as a web server, first, configure it to use a static IP. Its been a while since I've done it on windows, but this looks about right http://www.howtogeek.com/howto/19249/how-to-assign-a-static-ip-address-in-xp-vista-or-windows-7/.
Next you will need to configure port forwarding on your model. You want to send all traffic on port 80 to your machine, using its new fixed IP address. If your using HTTPS as well, configure port 443 to go to your machine. There are too many different modem brands, all of which handle this slightly differently, to consider offering any more help on this. You will need to do some reading up on your particular modem for step-by-step instructions.
If your internet connection is using a fixed IP, then you can stop here.
If not, or if you just want a domain name, then its worth signing up for a dynamic dns service. I use No-ip, its free, it integrates with my modem and I haven't had any problems with it in the last few years. Once this is in place, you will be able to hit your webserver just like a real one. Using something like "http://mypc.no-ip.biz/mydemoapp/
But again, be warned about exposing your machine on the internet. There are nasty people out there who love to hijack other peoples computers.
Update:
This should give you some guidance on port forwarding
http://www.howtogeek.com/66214/how-to-forward-ports-on-your-router/
Try http://www.noip.com I just logged in and it seemed happy. Otherwise, have a click through all the settings in your modem looking for ddns or dynamic DNS. There is usually a drop down of all the providers that it will talk to. And some providers have apps that you run on your PC , which is easier that working with the modem for some. (Or for models that don't support ddns.)
Has anyone experienced running multiple collaborating applications on Heroku? For example, an admin application to manage another application; or a stats server observing another application?
On Amazons' EC2 platform you can use security groups to restrict access to servers, creating a virtual network between your application or server instances. Is there any such way to do this on Heroku? If so, can you open UDP as well as TCP connections?
Thanks
Robbie
The comment from #elithrar is correct. To talk between applications you either need to define an API, or used shared resources. For example you can have 2 applications connect to the same database by manually copying and pasting the DATABASE_URL from one app to another. This has the downside that should we need to roll credentials (very rare) your manually copied configuration will break.
The same pattern can be used with any add-ons, such as https://addons.heroku.com/redistogo or https://addons.heroku.com/iron_mq to share a message bus or queue between two applications.
Guys, been knocking my head against the desk (instead of the mac) for hours. I'm running VS 2008 in a parallels VM. I can access the development server in the VM if local host is used, if I use the designated ip for the VM or try to access it externally it does not work. All firewalls are off and I verified that I can access iis externally.
Any Ideas what could be wrong?
I ran into this same problem and am using a TCP tunnel to bypass it. Download this Java app & just tunnel the traffic back. No messing with IIS necessary!
http://jcbserver.uwaterloo.ca/cs436/software/tgui/tcpTunnelGUI.shtml
In command prompt, you'd then run the java app like this... Let's assume you want external access on port 80 and your standard debug environment runs on port 1088...
java -jar tunnel.jar 80 localhost 1088
Yes, it is by design. Consider using IIS instead.
The first answer is that you can't do it because the development server is specifically made to just run locally, otherwise it becomes a security risk.
The second answer is that you can get around anything, this hints that there is a way to do it using a reverse-proxy (but the post he links to seems to be dead)
EDIT : After viewing RichardOD's answer, I fear that my answer below is wrong and you can not access it using IP.
But I suggest you to go with deploying it to IIS.
The VS2008 internal web server ( which I guess is cassini ) creates a port for your app and runs a web server for your app on that port. If you want to access it from outside the machine you have to use that port in addition to IP.
I have 50 machines in a LAN and each of these have internet access. Can a program be developed using vc++ which will tell what are all the websites which is being opened by users in each machine?
You can easily accomplish this by writing an application which captures packets outbound on port 80 (and the associated DNS information). The problem is that this application must run on every client computer which you want to trace. The easier method, as stated by others, is to take advantage of your network architecture and tunnel all traffic through a central proxy which can record the same information.
There are many-many enterprise tools suited for just this task in the latter instance.
Route your internet traffic through a centralized proxy and monitor the traffic from proxy say using Fiddler, or something else. In case proxying is not possible, use Fiddler to generate data at known location and then collate it at required intervals.
Install a firewall, if you don't already have one, and use it to log connections.