.conf file format
View, inspect, merge, and learn how CONF files are used for application settings, server configuration, scripts, services, development tools, and system workflows.
Also known as: Config, Configuration
Format
.conf
Original files stay unchanged. Tools download a new file when output is generated.
Every tool listed here works with .conf files and runs in your browser. If the task you need is not here, the related formats below may cover it.
Open and inspect common configuration files in a simple browser workspace.
Merge CONF configuration files in order while preserving original text.
Open and inspect INI configuration files in your browser.
Merge INI configuration files in order with clean separators between files.
Open, search, and inspect plain text files in your browser.
It tells you the file configures something and nothing about its syntax. nginx.conf uses nested blocks with braces and semicolon-terminated directives. sshd_config uses one directive per line with no punctuation. Apache uses XML-like container tags. httpd, resolv.conf, and a Python logging config share almost nothing. Always identify the application before assuming a structure.
Most serious configuration systems split across files: an include line, a conf.d directory, a sites-enabled symlink farm. The file you are reading is often a small entry point and the setting you are hunting lives somewhere else entirely. Follow the includes before concluding a value is not set.
Config files carry credentials, internal hostnames, ports, and paths, which makes them both sensitive and worth reviewing carefully. Diffing a working file against a broken one is usually faster than reasoning about either in isolation, and comments in these files are frequently the only documentation that exists.
Whatever its application defines. Identify the program first — nginx, sshd, Apache, and systemd all use different and incompatible syntaxes in files ending .conf.
You can concatenate them, but whether the result is valid depends on the application. Block-structured formats like nginx will not tolerate two files being naively joined mid-block.
Common causes: an include elsewhere overrides it, a later directive wins, you edited a file the application does not read, or the service was not reloaded.