How to start a SysV init script after network starts in Red Hat Enterprise Linux 7

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • SysVinit service script
  • systemd

Issue

  • systemd includes compatibility for SysVinit service scripts in /etc/rc.d but how can you configure dependencies so that a 3rd-party initscript doesn't start until after some other native systemd unit (like networking)?

  • We are working on porting our legacy platform from RHEL5 to RHEL7 and we are running into issues where the chkconfig'd sysvinit services are starting before network and NFS which are dependencies. Is there a way to delay sysvinit scripts until systemd init has finished, or even better yet untill a couple of wants are satisfied?

  • I have a legacy SysV init script that needs to start after the network starts in RHEL 7 and I cannot convert the initscript to a systemd service file.

Resolution

  • Put the Required-Start: $network directive in the LSB header of the SysVinit script
    Use the rhnsd service script as an example:

    $ awk '/### BEGIN INIT INFO/,/### END INIT INFO/' /etc/init.d/rhnsd 
### BEGIN INIT INFO
# Provides: rhnsd
# Required-Start: $local_fs $network $remote_fs $named $time
# Required-Stop: $local_fs $network $remote_fs $named
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Starts the Spacewalk Daemon
# Description: This is a daemon which handles the task of connecting
#               periodically to the Spacewalk servers to
#               check for updates, notifications and perform system
#               monitoring tasks according to the service level that
#               this server is subscribed for.
### END INIT INFO

  • See also:

Root Cause

Diagnostic Steps

  • Find out what is starting first using provided tools such as:

    systemd-analyze plot > analyzestartup.svg

    Then analyzestartup.svg with firefox or an image viewer

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