For instance, a contact form in the site can be abused by attackers to generate a traffic spike.Īs most attacks are often intended at causing downtime to the websites by draining out the server or the container resources, such high traffic often leads to “service unavailable error”. A peak sale time or a business growth can pull in valid traffic to a website, which may not have been foreseen by the customer.īut many a time, the web traffic spikes due to attacks or bots or others hack attempts to the site. The access to a website can vary from time to time. If the web server configuration settings (such as connection counts, memory limits, etc.), are not fine-tuned in the server, it can cause “service unavailable error”. While the default settings may work fine for low density and low traffic web servers, it may not be the optimal setting to handle an increase in the traffic and website count. Many server owners leave this default setting as it is, and build their hosting upon it. Web server misconfigurationīy default, all web servers come with a common configuration. When the resources allocated to a container or an account is not enough for its normal functioning, the website hosted in it can give intermittent errors due to this resource shortage. In a docker machine, each container would be allotted a set of limited resources. would be divided among multiple websites hosted in the server. Server resources such as memory, CPU, I/O, disk, etc. In a shared hosting environment where multiple websites are hosted, server owners often try to achieve high account density, to ensure maximum gains. Some of the various reasons we’ve come across in our debugging experience, are: 1. What causes “503 service unavailable error”Īnything from an overloaded server to a buggy plugin, can cause a WordPress site to be unavailable. While other errors have clear cut reason, 503 error is often an ambiguous one. Many reasons – server wide or site specific – can cause this “service unavailable error”. It was one such WordPress site that was giving the error in backend. The client who consulted us, was offering Docker hosting, and each container hosted a WordPress site. It can lead to the website being unavailable to the visitors at that time. What is “503 service unavailable error”?Ī “503 service unavailable error” is an indication that the web server is unable to handle the request temporarily. Today, we’ll see the various solutions we considered, and how you can fix this error if you come across similar situations. Needless to say, it was an Emergency situation, and we started working on it through our priority channel : Emergency Support Services. That’s when he contacted us for assistance. Customer feared that visitors would start abandoning the site, and business would get affected. Whenever the site traffic went high, that was when the ‘service unavailable error’ was noticed. There were multiple sites hosted in the Docker machine, but the 503 error was seen in the backend of only one website.
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