追記
Gentoo忘年会ー勉強会 2014-12-20 - connpassでGentoo Advent Calendar 2014 - Qiitaの存在を知りましたのでお酒を呑みながら慎重に検討した結果この記事は21日目に再配置されました。 ときにはそういうことも必要だと思います！
20日目は@aliceinwireさんでした。 22日目は@kizononnさんです。
追記ここまで
Linuxサーバーを運用していると"Too many open files"に出くわし"ulimit 反映されない"でググって Linux サーバでの「Too many open files」対策について - akishin999の日記 や ulimitが効かない不安を無くす設定 | 外道父の匠 のお世話になるのはままある話。
Gentooの場合、起動スクリプトで起動するプロセス(いわゆるdaemon)であれば簡単にulimitを設定できる。
たとえばRedmineをdaemon化するこんな起動スクリプトを書いたとして、
[root@redmine-host] # cat /etc/init.d/redmine
#!/sbin/runscript
# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
description="Redmine daemon"
REDMINE_ENVIRONMENT="${REDMINE_ENVIRONMENT:-production}"
REDMINE_USER="${REDMINE_USER:-redmine}"
REDMINE_GROUP="${REDMINE_GROUP:-redmine}"
REDMINE_NAME="${SVCNAME##*.}"
if [ -n "${REDMINE_NAME}" -a "${SVCNAME}" != "redmine" ]; then
description="${description} for ${REDMINE_NAME}"
REDMINE_PID_FILE="/var/run/redmine.${REDMINE_NAME}.pid"
REDMINE_RB_DEFAULT="/etc/redmine/${REDMINE_NAME}.rb"
else
REDMINE_PID_FILE="/var/run/redmine.pid"
REDMINE_RB_DEFAULT="/etc/redmine/unicorn.rb"
fi
REDMINE_DIR="${REDMINE_DIR:-/var/lib/redmine}"
REDMINE_RB="${REDMINE_RB:-${REDMINE_RB_DEFAULT}}"
REDMINE_WORKER_PROCESSES="${REDMINE_WORKER_PROCESSES:-4}"
REDMINE_BUNDLE_EXEC="${REDMINE_BUNDLE_EXEC:-/usr/local/bin/bundle}"
LD_PRELOAD_OPTS=""
if [ -f "/usr/lib64/libjemalloc.so" ]; then
LD_PRELOAD_OPTS="/usr/lib64/libjemalloc.so"
fi
depend() {
need net
}
start() {
ebegin "Starting ${SVCNAME}"
start-stop-daemon \
--start \
--chdir "${REDMINE_DIR}" \
--user "${REDMINE_USER}" \
--background \
--make-pidfile --pidfile "${REDMINE_PID_FILE}" \
--env PATH="${PATH}:$(dirname ${REDMINE_BUNDLE_EXEC})" \
--env LD_PRELOAD="${LD_PRELOAD_OPTS}" \
--env REDMINE_PID_FILE="${REDMINE_PID_FILE}" \
--exec "${REDMINE_BUNDLE_EXEC}" \
-- exec unicorn_rails -c "${REDMINE_RB}" -E "${REDMINE_ENVIRONMENT}"
eend $?
}
stop() {
ebegin "Stopping ${SVCNAME}"
start-stop-daemon --stop --pidfile "${REDMINE_PID_FILE}"
eend $?
}
/etc/conf.d/SVCNAMEにrc_ulimitを書いておくと反映してくれる。
[root@redmine-host] # cat /etc/conf.d/redmine rc_ulimit="-n 65535" rc_need="nginx" REDMINE_DIR="/var/lib/redmine/versions/current" REDMINE_BUNDLE_EXEC="/usr/local/bin/bundle" REDMINE_RB="/var/lib/redmine/versions/current/config/unicorn.rb"
便利！
[root@redmine-host] # cat /proc/$(cat /var/run/redmine.pid)/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 3981 3981 processes Max open files 65535 65535 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 3981 3981 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us
ちなみにcomment outすると
[root@redmine-host] # grep rc_ulimit /etc/conf.d/redmine #rc_ulimit="-n 65535"
こんな感じ。
[root@redmine-host] # cat /proc/$(cat /var/run/redmine.pid)/limits Limit Soft Limit Hard Limit Units Max cpu time unlimited unlimited seconds Max file size unlimited unlimited bytes Max data size unlimited unlimited bytes Max stack size 8388608 unlimited bytes Max core file size 0 unlimited bytes Max resident set unlimited unlimited bytes Max processes 3981 3981 processes Max open files 1024 4096 files Max locked memory 65536 65536 bytes Max address space unlimited unlimited bytes Max file locks unlimited unlimited locks Max pending signals 3981 3981 signals Max msgqueue size 819200 819200 bytes Max nice priority 0 0 Max realtime priority 0 0 Max realtime timeout unlimited unlimited us
