I'm an experienced dev, but new to the sysadmin side of things. I'm running a node.js application, that uses a redis database and has nginx running a reverse proxy to server the node pages over https.
My concern is that one or all 3 will fall over under heavy load or error and there's nothing to get it started back up. Any advice is greatly appreciated.
My server is Ubuntu 14.04 LTS.
Many thanks =)
One of the best option is to use upstart.
The original documentation is pretty complicated, but take a look:
http://upstart.ubuntu.com/cookbook/
And here is what you exactly need, if I correctly understand your issue:
http://blog.joshsoftware.com/2012/02/14/upstart-scripts-in-ubuntu/
I found the easiest setup and ongoing monitoring for a new sysadmin came from Monit (http://mmonit.com/monit/)
There is a new solution for that called pm2. I use it and it's working fine.
Related
I'm quite new to UMN Mapserver and started learning and so far I've only being experimenting on my localhost. Maybe I'm overthinking about it but what if I wanted my application let's say to be on the internet "alive." I believe this does not necessarily mean that I have to set up a server at my home... right? So could I install Mapserver on a server I'm renting let's say ? Sorry if it's irrelevant question but just trying to understand the underlying logic
Yes, install it anywhere you want. You just have to install the data on that server also.
In the past couple of years NodeJS became a major player in the server landscape - and I really find it hard to believe that there is no decent way to have nodejs run as a service on a linux box. On Windows we have iisnode - but for non Windows environments the forever package is suggested as the way to go - instead of a real solution.
Is there maybe a servicized version of nodejs out there that I could not locate?
There isn't a "servicized" version of Node.js available in the sense you are thinking. Keeping your Node application running (for example in the event of a fatal error) is up to you entirely.
As suggested in the first comment, this is fairly subjective, but really there are two big packages (and one or two alternative methods) for making a service out of your Node application. As you've mentioned, forever is a popular choice. If you've never taken a look at pm2, I suggest doing so, as it offers some services that forever does not. Alternatively, you could search for information on supervisord, which I've had success with in the past. Finally, daemonizing Node with upstart is something to look at if the others don't fit well for you.
I would like to start out by apologizing. I have very little knowledge in the areas of Linux and Servers. I have been asked at work to set up a Linux box running Apache Tomcat. The Server needs to be enabled to allow websockets. I managed to get Debian installed. During the installation it gave me the option to make it a web server, which I did. There are now some different folders and files that are named "apache" in the files system, so my guess is that I am in fact running Apache, but to be honest I'm not 100% sure, and if it is, I don't know if its Tomcat. I fumbled around a bit and figured out the IP address of the computer I installed on and tried going to that IP from another computer in the network and it worked. I was able to see the html file that I put in the /var/www folder on the host machine. I then went out and found a nice piece of code, someone was kind enough to share, that is suppose to test websockets capability but I cant seem to get it working. My thinking is that my server isn't allowing PHP to run. I came to this conclusion by testing. I took a web page from my other server, its written in PHP, that when opened will send a text to my phone. Its just a small piece of code that I used for testing. When I tried running it from the Linux server it wont run, meaning it wont send the text to my phone. So here I am. I realize I'm asking for a simple solution to a complex problem, but I'm under the gun so to speak. I have about a week to get this going, so I just don't have the time to really immerse my self in this stuff the way I would like to. My question in its simplest form is"How do I configure my server to run PHP?" Any help/advice would be greatly appreciated! Thank you all for your time and patience.
Have you tried running a simple PHP script like echo 'Hello World';??
If not then try, if it works then your PHP is up, but sockets are just not configured to use.
If it doesn't work then install Ubuntu, a simple newbie friendly interface for Linux, and then install LAMP, here its how to do it.
And don't panic.
We have a whiteboard application powered by NodeJS sitting on a 'cloud' server (rackspace cloud). I recently scaled our server up to accommodate for the anticipated traffic with our launch, and in the process it shut down NodeJS. We are launching our product in a few hours, and our NodeJS developer has gone for the day.
The whiteboard application is supposed to run at http://rayku.com:8001 (the port is opened). However, it's not working because the port isn't listening to anything with NodeJS shut down.
I honestly have no idea which js file to run in order to start NodeJS for the whiteboard. There are many js files in a 'whiteboard' folder. Do you know what type of code I should look for that might suggest it is the right one? Or, do you know what types of logs I can dig up that might point me in the right direction?
Much appreciated
Look for app.js, server.js or something similar. It isn't required but a lot of people use app.js from what I have seen.
node or nodejs is typically the command to start. You may need to set environmental variables or arguments depending on how the developer set things up.
Also make sure to run it with screen or forever so it doesn't quit when you log out.
For common code. createServer is probably what is used to open the server itself. That is consistent between the core libraries and a lot of the frameworks. There might be another file that loads the module prior to executing so running might not work.
I'm a newbie JavaScript programmer who wants to experiment with server side JavaScript using Node.Js on my Mac
I downloaded NodeJs and the wizard installed it, but now I can't see it in my applications?
1) How do I open it and start using it? Do I do it from the command line? if so, how do I start?
2) Can I connect it to a MySQL database I have installed with MAMP?
Thanks if you can help
To start node, you open a terminal and type:
/path/to/node scriptname.js
Depending on how you installed node, the actual location of node may vary. You should figure that out. You should probably add that path to your PATH environment variable. If you do this then you can simply type
node scriptname.js
There are plenty of samples around the net. As for mysql connectivity, check this out.
I am in pretty much in the same boat as you are, and I highly recommend you to watch the meetup talk by Ryan Dahl on http://nodejs.org/
It is only about an hour long, but it pretty shows you how you can use it for your own non-blocking applications.
In terms of driver for accessing SQL, you will need to install NPM http://npmjs.org/
You can do a quick search http://search.npmjs.org/, on the support for MySQL. Because node.js is still relatively new to the scene, you will see quite a bit of choices competing to meet your goal