On 20/11/17 11:30, Jaromil wrote:
1- it [ rc.local ] is not created by default

It exists on my stretch systems.  As  Olaf Meeuwissen said it is created by initscripts.postinst:

   #
   # Create /etc/rc.local on first time install and when upgrading from
   # versions before "2.86.ds1-16"
   #
   if dpkg --compare-versions "$PREV_VER" lt "2.86.ds1-16"
   then
            if [ ! -e /etc/rc.local ]; then
                    cat << EOF > /etc/rc.local
   # rc.local
   #
   # This script is executed at the end of each multiuser runlevel.
   # Make sure that the script will "exit 0" on success or any other
   # value on error.
   #
   # In order to enable or disable this script just change the execution
   # bits.
   #
   # By default this script does nothing.

   exit 0
   EOF
                    # make sure it's enabled by default.
                    chmod 755 /etc/rc.local
            fi
   fi


2- it is not executed in Debian Stretch (9) even if existing

I, as you might have guessed, use systemd, so rc.local is started by rc-local.service:

   ● rc-local.service - /etc/rc.local Compatibility
       Loaded: loaded (/lib/systemd/system/rc-local.service; static;
   vendor preset:
      Drop-In: /lib/systemd/system/rc-local.service.d
               └─debian.conf
       Active: active (exited) since Mon 2017-10-30 11:03:59 CET; 3
   weeks 1 days ago
      Process: 655 ExecStart=/etc/rc.local start (code=exited,
   status=0/SUCCESS)
        Tasks: 0 (limit: 4915)
       CGroup: /system.slice/rc-local.service


The service rc-local.service is:

   # This unit gets pulled automatically into multi-user.target by
   # systemd-rc-local-generator if /etc/rc.local is executable.
   [Unit]
   Description=/etc/rc.local Compatibility
   ConditionFileIsExecutable=/etc/rc.local
   After=network.target

   [Service]
   Type=forking
   ExecStart=/etc/rc.local start
   TimeoutSec=0
   RemainAfterExit=yes
   GuessMainPID=no
   # This unit gets pulled automatically into multi-user.target by
   # systemd-rc-local-generator if /etc/rc.local is executable.
   [Unit]
   Description=/etc/rc.local Compatibility
   ConditionFileIsExecutable=/etc/rc.local
   After=network.target

   [Service]
   Type=forking
   ExecStart=/etc/rc.local start
   TimeoutSec=0
   RemainAfterExit=yes
   GuessMainPID=no


The source of the generator, systemd-rc-local-generator, is at https://github.com/systemd/systemd/blob/master/src/rc-local-generator/rc-local-generator.c

please correct me if I'm wrong. That would help.

I think you're wrong.
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