sysctl.d/50-default.conf

   1 #  This file is part of systemd.
   2 #
   3 #  systemd is free software; you can redistribute it and/or modify it
   4 #  under the terms of the GNU Lesser General Public License as published by
   5 #  the Free Software Foundation; either version 2.1 of the License, or
   6 #  (at your option) any later version.
   7
   8 # See sysctl.d(5) and core(5) for documentation.
   9
  10 # To override settings in this file, create a local file in /etc
  11 # (e.g. /etc/sysctl.d/90-override.conf), and put any assignments
  12 # there.
  13
  14 # System Request functionality of the kernel (SYNC)
  15 #
  16 # Use kernel.sysrq = 1 to allow all keys.
  17 # See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html for a list
  18 # of values and keys.
  19 kernel.sysrq = 16
  20
  21 # Append the PID to the core filename
  22 kernel.core_uses_pid = 1
  23
  24 # Source route verification
  25 net.ipv4.conf.all.rp_filter = 1
  26
  27 # Do not accept source routing
  28 net.ipv4.conf.all.accept_source_route = 0
  29
  30 # Promote secondary addresses when the primary address is removed
  31 net.ipv4.conf.all.promote_secondaries = 1
  32
  33 # Fair Queue CoDel packet scheduler to fight bufferbloat
  34 net.core.default_qdisc = fq_codel
  35
  36 # Request Explicit Congestion Notification (ECN) on both in and outgoing connections
  37 net.ipv4.tcp_ecn = 1
  38
  39 # Enable hard and soft link protection
  40 fs.protected_hardlinks = 1
  41 fs.protected_symlinks = 1