Move existing Redis data to another server by temporarily turning the target into a replica, then detaching it after synchronization.

Ubuntu Server in VMware needs manual VM setup, VMware Tools installation, and display and keyboard configuration for a usable desktop console.

Restricted networks can block mail protocols while still allowing SSH. Tunneling the mail connection through a trusted server lets an e-mail client reach the server from localhost.

openssl s_client can verify whether a server supports Perfect Forward Secrecy by checking if a cipher handshake succeeds or fails.

bin/webpack-dev-server can fail with Yarn's "Command "webpack-dev-server" not found" error when dependencies are missing; yarn install --check-files restores the command.

Unused Paperclip image style files can accumulate on the server after style changes, wasting storage and cluttering attachment directories.

RubyODBC fails to create an ODBC environment handle when connecting Ruby 1.8.7 on Ubuntu 10.10 to SQL Server 2005; rebuilding the gem with the correct unixODBC path restores connectivity.

IMAP mailbox migration between servers is often tedious with many unreliable tools; imapsync offers a practical source-based alternative for copying mail accounts.

Need to roll back Google Chrome on Ubuntu after an update breaks it; fetching an older .deb from Google’s servers can isolate the regression, but outdated browsers are risky.

Always-on UI behaviors like polling, animations, autocomplete, and lazy loading can make E2E tests flaky; feature flags disable them by default and re-enable them only where needed.

Capistrano 3 replaces the old DSL with Rake and SSHKit, changing task syntax, hooks, server settings, and file layout during migration from Capistrano 2.

Capistrano can hide long command output with ellipses, making deployment logs harder to read. Disabling Airbrussh truncation keeps full server paths and responses visible.

Server-to-server access to the Facebook Graph API can use an app token instead of OAuth; some resources still require a user-authenticated request.

Rotating an Amazon ELB SSL certificate requires IAM server certificate upload and attaching the new ARN to the load balancer listener.

Serve a directory of generated mail files as a local POP3 mailbox for testing clients and inaction_mailer output.

MySQL defaults can corrupt UTF-8 exports and force manual charset settings for each new database. Setting server and client defaults to utf8mb4 prevents incorrect mysqldump output.

Ruby 1.8.7 can no longer connect to rubygems.org with Rubygems 1.8.30 and Bundler 1.17.3 because of expired server certificates. Local proxying or disabling SSL verification can restore installs.

Application servers often compress responses with gzip, but Wget downloads the uncompressed version unless Accept-Encoding: gzip is sent.

Connecting Ruby applications to SQL Server through ODBC can unblock legacy setups when native adapters fail. sequel can use an existing ODBC DSN for database access.

Running Solr with Sunspot adds Rails search, but requires local setup, reindexing, error handling, and production configuration for a separate Solr server.

Rails 2 apps can break on MySQL 5.7; MariaDB 10.x is a compatible replacement for old and new applications, with gem rebuilds sometimes needed after switching.

Run Selenium tests in a hidden X session with vncserver, keeping the browser accessible for inspection without adding a gem.

Capistrano can check out code on the target server using SSH agent forwarding instead of a separate repository key. ssh_options[:forward_agent] = true enables this, but it should be used with caution.

Set the Rails environment explicitly when running server-side scripts to avoid using the wrong database or configuration. Rails 2 uses script/runner; Rails 3 uses rails runner.