Developer and system tools to test configs before you run them
Test a config before you run it on a real system: file permissions, .dockerignore and Compose files, LXC ID mappings, and rsync filters. Paste your own rules and paths to see what each line does. The checks run in your browser and don't touch your files.
Tools
Chmod calculator
Turn a chmod number into rwx letters, or build one from checkboxes.
.dockerignore tester
See which paths a .dockerignore file excludes, and which line decides.
Docker Compose checker
Find YAML errors, broken references, and open ports in a pasted Compose file.
LXC ID mapping checker
See which host UID a container ID maps to, and check subuid grants.
Rsync filter tester
Test rsync include and exclude rules against paths and see which rule wins.
Keyboard shortcuts cheat sheet generator
Print one keyboard shortcut cheat sheet for the apps and tasks you use.