Question Is it possible to activate a maintenance mode in a Rails application? Basically we need to stop the requests and display a maintenance page while we perform some updates on the database. Answer There isn’t a built-in solution in…
Question I use Rails credentials for managing secrets in a secure way. Now I need to change some secret credentials for the production environment. Can you provide the full command for editing the file (config)? Answer This is the command:…
Question Passkeys will probably replace passwords in the future. How do they work? Can you explain passkeys in simple words? Answer When you sign up to a website, instead of entering a new password, your browser generates a new key…
Question I see on ArtifactHub that there’s a new version of a chart, so I try to upgrade the chart on my Kubernetes cluster. For example I run this command to update the metrics-server chart: The upgrade apparently succeeds (there…
Question I have installed PHP on MacOS with Homebrew using this command: However if I run php from command line (e.g. php –version) I get this error: How can I fix this? Answer You need to use this command: However…
Question An error occurred while installing openssl (2.2.2), and Bundler cannot continue. How do I solve this error on MacOS? I have upgraded MacOS, Xcode, Xcode command line tools, Homebrew and the Homebrew formula for openssl. Now when I run…
Question After a new deployment, some pods are “Pending” and cannot be scheduled by Kubernetes on any node, due to resources shortage. How do I find out which pods are requesting a lot of CPU? Answer You can easily see…
Question Sidekiq workers consume a lot of memory: how can I fix that? I have a Rails application that can usually run with about 1 GB of RAM. However there are some Sidekiq workers that constantly grow over time –…
Question What do you see if a pod is killed because memory on the node is insufficient? I read that Kubernetes will kill some pods if the memory on a node is not enough for all the workloads. What will…
Question git svn error “Can’t locate SVN in @INC” on MacOS git svn has stopped working after the upgrade to MacOS Monterey. When I run a Subversion command using Git (e.g. git svn rebase) I get this error: What should I do?…