When your app is acting as a proxy to back end servers, it it may need to do a DNS lookup to convert the host name of the server into an IP hundreds of times a second. DNS can become the bottleneck for requests. It also puts heavy load on …
The goal of benchmarking is to understand the performance of our system and how to improve it. When we are making benchmarks, we need to make sure that they match real world usage.
In my post on Benchmarking Phoenix on Digital Ocean, changing the concurrent connections and network latency had …
This is a gentle introduction to getting your Phoenix app up and running on a $5/month server at Digital Ocean. It starts from zero, assuming minimal experience with servers.
Figuring out how to deploy your Elixir app can be confusing, as it's a bit different from other languages. This post describes how we deploy apps with the reasons behind our decisions.
We have created a working example template which puts all the pieces together to get you started quickly …
Database migrations are used to automatically keep the database in sync with the code that uses it. Elixir apps should be deployed as releases, supervised by systemd. Here is an example of how to run migrations when deploying Elixir releases.
It's tempting to automatically run database migrations when the app …
After we have deployed the new release, we restart the app to make it live:
sudo /bin/systemctl restart foo
The user account needs sufficient permissions to restart the app, though. Instead of giving the deploy account full sudo permissions …
When your app is running behind a proxy like Nginx, then the request will look
like it's coming from Nginx, i.e. the IP will be
127.0.0.1. Similarly, If
Nginx is behind a CDN, then all the requests will come from the IP of the CDN.
Normally, in order to listen on a port less than 1024, an app needs to be running as root or have elevated capabilities. That's a security problem waiting to happen, though. We run the app on a normal port, e.g. 4000, and redirect traffic in the firewall from port …
It's common to run web apps behind a proxy such as Nginx or HAProxy. Nginx listens on port 80, then forwards traffic to the app on another port, e.g. 4000.
Following is an example
user nginx; worker_processes auto; error_log /var/log/nginx/error.log warn; pid …
- db migrations
- functional programming
- graphical design
- know your customer
- rate limiting
- static assets
- user experience
- user stories