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|
#!/bin/sh
set -ue
tfile=`mktemp /etc/.memcached.conf.XXXXXXX`
cat > $tfile <<EOF
################################
#
# This config file generated by the juju memcached charm. Changes
# may not be preserved.
#
################################
#
# memcached default config file
# 2003 - Jay Bonci <jaybonci@debian.org>
# This configuration file is read by the start-memcached script provided as
# part of the Debian GNU/Linux distribution.
# Run memcached as a daemon. This command is implied, and is not needed for the
# daemon to run. See the README.Debian that comes with this package for more
# information.
-d
# Log memcached's output to /var/log/memcached
logfile /var/log/memcached.log
# Be verbose
# -v
# Be even more verbose (print client commands as well)
# -vv
# Start with a cap of 64 megs of memory. It's reasonable, and the daemon default
# Note that the daemon will grow to this size, but does not start out holding this much
# memory
-m `config-get size`
# Default connection port is 11211
-p `config-get tcp-port`
# Run the daemon as root. The start-memcached will default to running as root if no
# -u command is present in this config file
-u memcache
# Specify which IP address to listen on. The default is to listen on all IP addresses
# This parameter is one of the only security measures that memcached has, so make sure
# it's listening on a firewalled interface.
-l 0.0.0.0
# Limit the number of simultaneous incoming connections. The daemon default is 1024
-c `config-get connection-limit`
# Lock down all paged memory. Consult with the README and homepage before you do this
# -k
# Return error when memory is exhausted (rather than removing items)
# -M
# Maximize core file limit
# -r
EOF
append_numeric() {
local name=$1
local opt=$2
local target=$3
val=`config-get $name`
if [ "$val" != "-1" ] ; then
cat >> $target <<EOF
# $name
$opt $val
EOF
fi
}
append_bool() {
local name=$1
local opt=$2
local target=$3
val=`config-get $name`
if [ "$val" = "yes" ] || [ "$val" = "Y" ] ; then
cat >> $target <<EOF
# $name
$opt
EOF
fi
}
append_numeric "request-limit" "-R" $tfile
append_numeric "min-item-size" "-n" $tfile
append_numeric "slab-page-size" "-I" $tfile
append_numeric "threads" "-t" $tfile
append_bool "disable-auto-cleanup" "-M" $tfile
append_bool "disable-cas" "-C" $tfile
factor=`config-get factor`
if [ "$factor" != "-1.0" ] ; then
cat >> $tfile <<EOF
# factor
-f $factor
EOF
fi
size=`config-get size`
if [ $size -ge 2048 ] ; then
disableLP=`config-get disable-large-pages`
if [ "$disableLP" != "yes" ] && [ "$disableLP" != "Y" ] ; then
juju-log "Memory >= 2GB, using large-pages to speed up access"
# First try to reserve them
save_hugepages=`sysctl -n vm.nr_hugepages`
npages=$(($size/2))
sysctl -w vm.nr_hugepages=$npages
allocated=`sysctl -n vm.nr_hugepages`
if [ $allocated -lt $npages ] ; then
juju-log -l WARNING "Cannot allocate $npages contiguous pages for huge page allocation"
juju-log -l WARNING "Setting vm.nr_hugepages back to $save_hugepages"
sysctl -w vm.nr_hugepages=$save_hugepages
juju-log -l WARNING "Will disable large pages and fall back to regular memory"
else
juju-log "Allocated $npages contiguous blocks only for huge pages."
cat >> $tfile <<EOF
# large pages can be disabled with disable-large-pages
-L
EOF
fi
fi
fi
new_hash=`md5sum $tfile|cut -d' ' -f1`
old_hash=`md5sum /etc/memcached.conf|cut -d' ' -f1`
if [ "$new_hash" != "$old_hash" ] ; then
juju-log "New config generated. hash=$new_hash"
mv -f /etc/memcached.conf /etc/memcached.conf.$old_hash
mv -f $tfile /etc/memcached.conf
service memcached restart
else
juju-log "Config not changed. hash=$new_hash"
fi
tcp_port=`config-get tcp-port`
udp_port=`config-get udp-port`
# Work around http://pad.lv/900517
[ -n "$tcp_port" ] || tcp_port=0
[ -n "$udp_port" ] || udp_port=0
if [ $tcp_port -gt 0 ] ; then
open-port $tcp_port/TCP
fi
if [ $udp_port -gt 0 ] ; then
open-port $udp_port/UDP
fi
# In case port changed, inform consumers
hooks/cache-relation-joined
|