What are the variables $remote_fs and $syslog on SysVinit LSB header?

Question

From: https://wiki.debian.org/LSBInitScripts

    Add a block like this in the init.d script:

    ### BEGIN INIT INFO
    # Provides:          scriptname
    # Required-Start:    $remote_fs $syslog
    # Required-Stop:     $remote_fs $syslog
    # Default-Start:     2 3 4 5
    # Default-Stop:      0 1 6
    # Short-Description: Start daemon at boot time
    # Description:       Enable service provided by daemon.
    ### END INIT INFO

These variables are also present on SysVinit LSB header from scripts like "ssh".

Does anyone knows about these variables?

Answer 1

These are system facility names in Linux Standard Base. They're not treated like shell variables, they're just special names allowing init scripts to depend on certain system states.

In particular, $remote_fs and $syslog are defined as follows:

$remote_fs

all remote file systems are available. In some configurations, file systems such as /usr may be remote. Many applications that require $local_fs will probably also require $remote_fs.

$syslog

system logger is operational.