[Tweak] Include slapos-tweak script from slapprepare

Compatible with debian/ubuntu/opensuse, it is used to tweak few variables
needed for run KVM or optimize network transference or load some important
modules.

This script is not enabled by default, because it should be used with care.

slapos-node/Makefile

@@ -13,6 +13,7 @@ install: all
 	cp slapos-start $(DESTDIR)/usr/sbin/
 	cp slapos-test $(DESTDIR)/usr/sbin/
 	cp slapos-re6st-setup $(DESTDIR)/usr/sbin/
+	cp slapos-tweak $(DESTDIR)/usr/sbin/
 	cp $(DESTDIR)/opt/slapos/bin/slapos $(DESTDIR)/usr/bin/
 	# Open VPN configuration
 	mkdir -p $(DESTDIR)/etc/opt/slapos/

slapos-node/slapos-tweak

+#!/bin/sh -e
+
+mkdir -v -p -m 0755 `grep ^certificate_repository_path /etc/opt/slapos/slapos.cfg | sed 's/^certificate_repository_path.*= *//'` 
+
+grep ^computer_id /etc/opt/slapos/slapos.cfg | sed 's/^computer_id.*= *//' > /etc/hostname
+hostname -F /etc/hostname
+
+echo """ [SERVER TWEAK] Set sysctl, load kvm_intel and other modules."""
+
+# Setup more server like network parameters in order to avoid
+#    "Neighbour table overflow."
+# Those machines are itself has a lot of interfaces and are in
+# heavily networked environment, so limit of ARP cache for IPv4
+# and IPv6 is 4x higher then default
+# More tuning can be applied from: http://www.enigma.id.au/linux_tuning.txt
+sysctl -w \
+  net.ipv4.neigh.default.gc_thresh1=512 \
+  net.ipv4.neigh.default.gc_thresh2=1024 \
+  net.ipv4.neigh.default.gc_thresh3=2048 \
+  net.ipv6.neigh.default.gc_thresh1=512 \
+  net.ipv6.neigh.default.gc_thresh2=1024 \
+  net.ipv6.neigh.default.gc_thresh3=2048
+
+# Increase default aio-max-nr for sql servers
+sysctl -w fs.aio-max-nr=16777216
+# Increase semaphore limits
+sysctl -w kernel.sem="1250 256000 100 1024"
+
+# Force reboot after kernel panic
+sysctl -w kernel.panic=120
+
+# Yes we hardcode this here for debian
+e2label /dev/sda1 SLAPOS
+
+# Enable noop scheduler for disk which have SLAPOS labeled partition
+disk=\`blkid -L SLAPOS | sed -r -e 's/(\/dev\/|[0-9]*$)//g'\`
+echo noop > /sys/block/\$disk/queue/scheduler
+
+# Set kvm up
+modprobe kvm_intel
+sleep 1
+chmod 666 /dev/kvm
+
+# By pass if some of the followed modules are not available. 
+# This is usually needed or preferred for a specific hardware/distribution.
+set +e
+# Set power saving
+modprobe acpi_cpufreq > /dev/null  2>&1
+
+# Set hardware monitoring tools (for Shuttle xh61 machines)
+modprobe coretemp > /dev/null  2>&1
+modprobe f71882fg > /dev/null  2>&1
+set -e
+
+# Activate KSM (shared memory for KVM)
+echo 1 > /sys/kernel/mm/ksm/run
+
+slapos node format -v --now
+echo "[SlapOS Tweak] Finished at: `date`"
+echo "######################################################################"