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openrc/etc/rc.conf
Matt Whitlock fd1e4a384a add option for OOM score adjustment 
This commit adds a new --oom-score-adj option to start-stop-daemon and
supervise-daemon, as well as an equivalent SSD_OOM_SCORE_ADJ environment
variable. If either of these are specified (with the command-line
option taking precedence), then the specified adjustment value is
written to /proc/self/oom_score_adj after forking but prior to exec'ing
the daemon (at the time when nice and ionice are applied).

Additionally, per a suggestion by Mike Frysinger, the suggested values
for the SSD_NICELEVEL, SSD_IONICELEVEL, and SSD_OOM_SCORE_ADJ variables
in the example config file are now given as zeros, which are the
kernel's default values of these process knobs for the init process at
boot. Note that uncommenting any of these zero-valued suggestions will
cause SSD/SD to set the corresponding process knob affirmatively to
zero, whereas leaving the variable unset (and the equivalent command-
line option unspecified) means SSD/SD will not change the corresponding
process knob from its inherited value.

See: https://github.com/OpenRC/openrc/pull/435#discussion_r688310672
This fixes #435.
2021-12-22 10:01:14 -06:00

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# Global OpenRC configuration settings
# Set to "YES" if you want the rc system to try and start services
# in parallel for a slight speed improvement. When running in parallel we
# prefix the service output with its name as the output will get
# jumbled up.
# WARNING: whilst we have improved parallel, it can still potentially lock
# the boot process. Don't file bugs about this unless you can supply
# patches that fix it without breaking other things!
#rc_parallel="NO"
# Set rc_interactive to "YES" and you'll be able to press the I key during
# boot so you can choose to start specific services. Set to "NO" to disable
# this feature. This feature is automatically disabled if rc_parallel is
# set to YES.
#rc_interactive="YES"
# If we need to drop to a shell, you can specify it here.
# If not specified we use $SHELL, otherwise the one specified in /etc/passwd,
# otherwise /bin/sh
# Linux users could specify /sbin/sulogin
#rc_shell=/bin/sh
# Do we allow any started service in the runlevel to satisfy the dependency
# or do we want all of them regardless of state? For example, if net.eth0
# and net.eth1 are in the default runlevel then with rc_depend_strict="NO"
# both will be started, but services that depend on 'net' will work if either
# one comes up. With rc_depend_strict="YES" we would require them both to
# come up.
#rc_depend_strict="YES"
# rc_hotplug controls which services we allow to be hotplugged.
# A hotplugged service is one started by a dynamic dev manager when a matching
# hardware device is found.
# Hotplugged services appear in the "hotplugged" runlevel.
# If rc_hotplug is set to any value, we compare the name of this service
# to every pattern in the value, from left to right, and we allow the
# service to be hotplugged if it matches a pattern, or if it matches no
# patterns. Patterns can include shell wildcards.
# To disable services from being hotplugged, prefix patterns with "!".
#If rc_hotplug is not set or is empty, all hotplugging is disabled.
# Example - rc_hotplug="net.wlan !net.*"
# This allows net.wlan and any service not matching net.* to be hotplugged.
# Example - rc_hotplug="!net.*"
# This allows services that do not match "net.*" to be hotplugged.
# rc_logger launches a logging daemon to log the entire rc process to
# /var/log/rc.log
# NOTE: Linux systems require the devfs service to be started before
# logging can take place and as such cannot log the sysinit runlevel.
#rc_logger="NO"
# Through rc_log_path you can specify a custom log file.
# The default value is: /var/log/rc.log
#rc_log_path="/var/log/rc.log"
# If you want verbose output for OpenRC, set this to yes. If you want
# verbose output for service foo only, set it to yes in /etc/conf.d/foo.
#rc_verbose=no
# By default we filter the environment for our running scripts. To allow other
# variables through, add them here. Use a * to allow all variables through.
#rc_env_allow="VAR1 VAR2"
# By default we assume that all daemons will start correctly.
# However, some do not - a classic example is that they fork and return 0 AND
# then child barfs on a configuration error. Or the daemon has a bug and the
# child crashes. You can set the number of milliseconds start-stop-daemon
# waits to check that the daemon is still running after starting here.
# The default is 0 - no checking.
#rc_start_wait=100
# rc_nostop is a list of services which will not stop when changing runlevels.
# This still allows the service itself to be stopped when called directly.
#rc_nostop=""
# rc will attempt to start crashed services by default.
# However, it will not stop them by default as that could bring down other
# critical services.
#rc_crashed_stop=NO
#rc_crashed_start=YES
# Set rc_nocolor to yes if you do not want colors displayed in OpenRC
# output.
#rc_nocolor=NO
##############################################################################
# MISC CONFIGURATION VARIABLES
# There variables are shared between many init scripts
# Set unicode to YES to turn on unicode support for keyboards and screens.
#unicode="NO"
# This is how long fuser should wait for a remote server to respond. The
# default is 60 seconds, but it can be adjusted here.
#rc_fuser_timeout=60
# Below is the default list of network fstypes.
#
# afs ceph cifs coda davfs fuse fuse.sshfs gfs glusterfs lustre ncpfs
# nfs nfs4 ocfs2 shfs smbfs
#
# If you would like to add to this list, you can do so by adding your
# own fstypes to the following variable.
#extra_net_fs_list=""
##############################################################################
# SERVICE CONFIGURATION VARIABLES
# These variables are documented here, but should be configured in
# /etc/conf.d/foo for service foo and NOT enabled here unless you
# really want them to work on a global basis.
# If your service has characters in its name which are not legal in
# shell variable names and you configure the variables for it in this
# file, those characters should be replaced with underscores in the
# variable names as shown below.
# Some daemons are started and stopped via start-stop-daemon.
# We can set some things on a per service basis, like the nicelevel.
#SSD_NICELEVEL="0"
# Or the ionice level. The format is class[:data] , just like the
# --ionice start-stop-daemon parameter.
#SSD_IONICELEVEL="0:0"
# Or the OOM score adjustment.
#SSD_OOM_SCORE_ADJ="0"
# Pass ulimit parameters
# If you are using bash in POSIX mode for your shell, note that the
# ulimit command uses a block size of 512 bytes for the -c and -f
# options
#rc_ulimit="-u 30"
# It's possible to define extra dependencies for services like so
#rc_config="/etc/foo"
#rc_need="openvpn"
#rc_use="net.eth0"
#rc_after="clock"
#rc_before="local"
#rc_provide="!net"
# You can also enable the above commands here for each service. Below is an
# example for service foo.
#rc_foo_config="/etc/foo"
#rc_foo_need="openvpn"
#rc_foo_after="clock"
# Below is an example for service foo-bar. Note that the '-' is illegal
# in a shell variable name, so we convert it to an underscore.
# example for service foo-bar.
#rc_foo_bar_config="/etc/foo-bar"
#rc_foo_bar_need="openvpn"
#rc_foo_bar_after="clock"
# You can also remove dependencies.
# This is mainly used for saying which services do NOT provide net.
#rc_net_tap0_provide="!net"
# This is the subsystem type.
# It is used to match against keywords set by the keyword call in the
# depend function of service scripts.
#
# It should be set to the value representing the environment this file is
# PRESENTLY in, not the virtualization the environment is capable of.
# If it is commented out, automatic detection will be used.
#
# The list below shows all possible settings as well as the host
# operating systems where they can be used and autodetected.
#
# "" - nothing special
# "docker" - Docker container manager (Linux)
# "jail" - Jail (DragonflyBSD or FreeBSD)
# "lxc" - Linux Containers
# "openvz" - Linux OpenVZ
# "prefix" - Prefix
# "rkt" - CoreOS container management system (Linux)
# "subhurd" - Hurd subhurds (to be checked)
# "systemd-nspawn" - Container created by systemd-nspawn (Linux)
# "uml" - Usermode Linux
# "vserver" - Linux vserver
# "xen0" - Xen0 Domain (Linux and NetBSD)
# "xenU" - XenU Domain (Linux and NetBSD)
#rc_sys=""
# if you use openrc-init, which is currently only available on Linux,
# this is the default runlevel to activate after "sysinit" and "boot"
# when booting.
#rc_default_runlevel="default"
# on Linux and Hurd, this is the number of ttys allocated for logins
# It is used in the consolefont, keymaps, numlock and termencoding
# service scripts.
rc_tty_number=12
##############################################################################
# LINUX CGROUPS RESOURCE MANAGEMENT
# This sets the mode used to mount cgroups.
# "hybrid" mounts cgroups version 2 on /sys/fs/cgroup/unified and
# cgroups version 1 on /sys/fs/cgroup.
# "legacy" mounts cgroups version 1 on /sys/fs/cgroup
# "unified" mounts cgroups version 2 on /sys/fs/cgroup
#rc_cgroup_mode="hybrid"
# This is a list of controllers which should be enabled for cgroups version 2
# when hybrid mode is being used.
# Controllers listed here will not be available for cgroups version 1.
#rc_cgroup_controllers=""
# This variable contains the cgroups version 2 settings for your services.
# If this is set in this file, the settings will apply to all services.
# If you want different settings for each service, place the settings in
# /etc/conf.d/foo for service foo.
# The format is to specify the setting and value followed by a newline.
# Multiple settings and values can be specified.
# For example, you would use this to set the maximum memory and maximum
# number of pids for a service.
#rc_cgroup_settings="
#memory.max 10485760
#pids.max max
#"
#
# For more information about the adjustments that can be made with
# cgroups version 2, see Documentation/cgroups-v2.txt in the linux kernel
# source tree.
#rc_cgroup_settings=""
# This switch controls whether or not cgroups version 1 controllers are
# individually mounted under
# /sys/fs/cgroup in hybrid or legacy mode.
#rc_controller_cgroups="YES"
# The following setting turns on the memory.use_hierarchy setting in the
# root memory cgroup for cgroups v1.
# It must be set to yes in this file if you want this functionality.
#rc_cgroup_memory_use_hierarchy="NO"
# The following settings allow you to set up values for the cgroups version 1
# controllers for your services.
# They can be set in this file;, however, if you do this, the settings
# will apply to all of your services.
# If you want different settings for each service, place the settings in
# /etc/conf.d/foo for service foo.
# The format is to specify the names of the settings followed by their
# values. Each variable can hold multiple settings.
# For example, you would use this to set the cpu.shares setting in the
# cpu controller to 512 for your service.
# rc_cgroup_cpu="
# cpu.shares 512
# "
#
# For more information about the adjustments that can be made with
# cgroups version 1, see Documentation/cgroups-v1/* in the linux kernel
# source tree.
# Set the blkio controller settings for this service.
#rc_cgroup_blkio=""
# Set the cpu controller settings for this service.
#rc_cgroup_cpu=""
# Add this service to the cpuacct controller (any value means yes).
#rc_cgroup_cpuacct=""
# Set the cpuset controller settings for this service.
#rc_cgroup_cpuset=""
# Set the devices controller settings for this service.
#rc_cgroup_devices=""
# Set the hugetlb controller settings for this service.
#rc_cgroup_hugetlb=""
# Set the memory controller settings for this service.
#rc_cgroup_memory=""
# Set the net_cls controller settings for this service.
#rc_cgroup_net_cls=""
# Set the net_prio controller settings for this service.
#rc_cgroup_net_prio=""
# Set the pids controller settings for this service.
#rc_cgroup_pids=""
# Set this to YES if you want all of the processes in a service's cgroup
# killed when the service is stopped or restarted.
# Be aware that setting this to yes means all of a service's
# child processes will be killed. Keep this in mind if you set this to
# yes here instead of for the individual services in
# /etc/conf.d/<service>.
# To perform this cleanup manually for a stopped service, you can
# execute cgroup_cleanup with /etc/init.d/<service> cgroup_cleanup or
# rc-service <service> cgroup_cleanup.
# If the kernel includes support for cgroup2's cgroup.kill, this is used
# to reliably teardown the cgroup.
# If this fails, the process followed in this cleanup is the following:
# 1. send stopsig (sigterm if it isn't set) to all processes left in the
# cgroup immediately followed by sigcont.
# 2. Send sighup to all processes in the cgroup if rc_send_sighup is
# yes.
# 3. delay for rc_timeout_stopsec seconds.
# 4. send sigkill to all processes in the cgroup unless disabled by
# setting rc_send_sigkill to no.
# rc_cgroup_cleanup="NO"
# If this is yes, we will send sighup to the processes in the cgroup
# immediately after stopsig and sigcont.
#rc_send_sighup="NO"
# This is the amount of time in seconds that we delay after sending sigcont
# and optionally sighup, before we optionally send sigkill to all
# processes in the # cgroup.
# The default is 90 seconds.
#rc_timeout_stopsec="90"
# If this is set to no, we do not send sigkill to all processes in the
# cgroup.
#rc_send_sigkill="YES"
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