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#!/bin/bash |
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# Copyright (C) 2009 Google Inc. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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# 02110-1301, USA. |
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# This is an example ganeti hook that writes the instance mac addresses in the |
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# node's /etc/ether file. It will pic up the first nic connected to the |
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# TARGET_BRIDGE bridge, and write it down with the syntax "MAC INSTANCE_NAME". |
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# The hook will also send a HUP signal the daemon whose PID is in |
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# DAEMON_PID_FILE, so that it can load the new /etc/ethers file and use it. |
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# This has been tested in conjunction with dnsmasq's dhcp implementation. |
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# It will also remove any other occurrences for the same instance in the |
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# aformentioned file. This hook supports the "instance-add", "instance-modify" |
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# "instance-remove", and "instance-mirror-replace" ganeti post hook paths. To |
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# install it add a symlink from those hooks' directories to where this file is |
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# installed (with a mode which permits execution). |
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# TARGET_BRIDGE: We'll only add the first nic which gets connected to this |
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# bridge to /etc/ethers. |
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TARGET_BRIDGE="br0" |
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DAEMON_PID_FILE="/var/run/dnsmasq.pid" |
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LOCKFILE="/var/lock/ganeti_ethers.lock" |
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hooks_path=$GANETI_HOOKS_PATH |
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[ -n "$hooks_path" ] || exit 1 |
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instance=$GANETI_INSTANCE_NAME |
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[ -n "$instance" ] || exit 1 |
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nic_count=$GANETI_INSTANCE_NIC_COUNT |
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acquire_lockfile() { |
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if ! ( set -o noclobber; echo "$$" > $LOCKFILE) 2> /dev/null; then |
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logger -s "Cannot acquire lockfile for ethers update" |
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exit 1 |
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fi |
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trap "rm -f $LOCKFILE" EXIT |
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} |
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update_ethers_from_new() { |
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chmod 644 /etc/ethers.new |
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mv /etc/ethers.new /etc/ethers |
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[ -f "$DAEMON_PID_FILE" ] && kill -HUP $(< $DAEMON_PID_FILE) |
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} |
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if [ "$hooks_path" = "instance-add" -o \ |
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"$hooks_path" = "instance-modify" -o \ |
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"$hooks_path" = "instance-mirror-replace" ] |
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then |
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for i in $(seq 0 $((nic_count - 1)) ); do |
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bridge_var="GANETI_INSTANCE_NIC${i}_BRIDGE" |
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bridge=${!bridge_var} |
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if [ -n "$bridge" -a "$bridge" = "$TARGET_BRIDGE" ]; then |
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mac_var="GANETI_INSTANCE_NIC${i}_MAC" |
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mac=${!mac_var} |
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acquire_lockfile |
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cat /etc/ethers | awk -- "! /^([[:xdigit:]:]*)[[:blank:]]+$instance\>/; |
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END {print \"$mac\t$instance\"}" > /etc/ethers.new |
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update_ethers_from_new |
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break |
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fi |
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done |
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fi |
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if [ "$hooks_path" = "instance-remove" -o \ |
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\( "$hooks_path" = "instance-modify" -a "$nic_count" -eq 0 \) ]; then |
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acquire_lockfile |
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cat /etc/ethers | awk -- "! /^([[:xdigit:]:]*)[[:blank:]]+$instance\>/" \ |
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> /etc/ethers.new |
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update_ethers_from_new |
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fi |
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