frontail(1) – realtime log stream in the browser

frontail is node.js application for serving tail -F output to browser.

Features

• search (Tab to focus, Esc to clear)
• basic authentication
• log rotation
• auto-scrolling
• marking logs
• themes (default, dark)
• number of unread logs in favicon
• highlighting

Installation

npm install frontail -g

Usage

frontail [options] [file ...]

Options:

  -h, --help                    output usage information
  -V, --version                 output the version number
  -h, --host <host>             listening host, default 0.0.0.0
  -p, --port <port>             listening port, default 9001
  -n, --number <number>         starting lines number, default 10
  -l, --lines <lines>           number on lines stored in browser, default 2000
  -t, --theme <theme>           name of the theme (default, dark)
  -d, --daemonize               run as daemon
  -U, --user <username>         Basic Authentication username, option works only along with -P option
  -P, --password <password>     Basic Authentication password, option works only along with -U option
  -k, --key <key.pem>           Private Key for HTTPS, option works only along with -c option
  -c, --certificate <cert.pem>  Certificate for HTTPS, option works only along with -k option
  --pid-path <path>             if run as daemon file that will store the process id, default /var/run/frontail.pid
  --log-path <path>             if run as daemon file that will be used as a log, default /dev/null
  --ui-hide-topbar              hide topbar (log file name and search box)
  --ui-no-indent                don't indent log lines
  --ui-highlight [path]         highlight words or lines if defined string found in logs, default preset ./preset/default.json

Web interface is on http://localhost:[port].

Highlighting

--ui-highlight [path] option turns on highlighting in UI. By default preset from ./preset/defatult.json is used:

{
    "words": {
        "err": "color: red;"
    },
    "lines": {
        "err": "font-weight: bold;"
    }
}

which means that every "err" string will be in red and every line with "err" will be bolded. Custom preset can be provided by

New presets are very welcome. If you don't like default or you would like to share your, please create PR with json file.

Screenshot