#!/bin/sh # Copyright 2016 Google Inc. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # Deal with a new hostname assignment. if [ -n "$new_host_name" ] && [ -n "$new_ip_address" ]; then # Delete entries with new_host_name or new_ip_address in /etc/hosts. sed -i "" '/Added by Google/d' /etc/hosts # Add an entry for our new_host_name/new_ip_address in /etc/hosts. echo "${new_ip_address} ${new_host_name} ${new_host_name%%.*} # Added by Google" >> /etc/hosts # Add an entry for reaching the metadata server in /etc/hosts. echo "169.254.169.254 metadata.google.internal # Added by Google" >> /etc/hosts fi # /sbin/dhclient-scripts in both ubuntu and centos have some problems for us: # 1) BOUND doesn't always set hostname (e.g. if old_host_name is unset in # precise pangolin) # 2) Using too long of a FQDN as a hostname causes some tools to break in # some distros (e.g. ssh-keygen) and hostname tool complains when given # a FQDN that is > 64 bytes. # # As a result, we set the host name in all circumstances here, to the truncated # unqualified domain name. if [ -n "$new_host_name" ]; then hostname "${new_host_name%%.*}" # If NetworkManager is installed set the hostname with nmcli. # to resolve issues with NetworkManager resetting the hostname # to the FQDN on DHCP renew. nmcli=$(which nmcli 2> /dev/null) if [ -x "$nmcli" ]; then nmcli general hostname "${new_host_name%%.*}" fi # Restart rsyslog to update the hostname. systemctl=$(which systemctl 2> /dev/null) if [ -x "$systemctl" ]; then hasrsyslog=$($systemctl | grep rsyslog | cut -f1 -d' ') if [ ! -z "$hasrsyslog" ]; then $systemctl -q --no-block restart "$hasrsyslog" fi else pkill -HUP syslogd fi fi