sonic-buildimage/files/image_config/hostname/hostname-config.sh

#!/bin/bash -e

CURRENT_HOSTNAME=`hostname`
HOSTNAME=`sonic-cfggen -d -v DEVICE_METADATA[\'localhost\'][\'hostname\']`

echo $HOSTNAME > /etc/hostname
hostname -F /etc/hostname

# Remove the old hostname entry from hosts file.
# But, 'localhost' entry is used by multiple applications. Don't remove it altogether.
if [ $CURRENT_HOSTNAME  != "localhost" ] || [ $CURRENT_HOSTNAME == $HOSTNAME ] ;  then
 sed -i "/\s$CURRENT_HOSTNAME$/d" /etc/hosts
fi

echo "127.0.0.1 $HOSTNAME" >> /etc/hosts
Add service to config hostname based on configdb (#1174) 2017-11-22 16:36:25 -06:00			`#!/bin/bash -e`

			CURRENT_HOSTNAME=`hostname`
			HOSTNAME=`sonic-cfggen -d -v DEVICE_METADATA[\'localhost\'][\'hostname\']`

			`echo $HOSTNAME > /etc/hostname`
			`hostname -F /etc/hostname`

[baseimage]: Avoid removing localhost entry from /etc/hosts file (#2452) - What I did This fix removes the possibility of 'localhost' entry getting removed from /etc/hosts file by hostname-config service. Without this change, whenever we change the hostname from 'localhost' to any other name on the config_db.json and reload the config, /etc/hosts file will only have the new hostname on it. But there are multiple sonic utilities (eg: swssconfig) which relies on the hard coded 'localhost' name and they tend to stop working. - How I did it Added a new check on hostname-config.sh script to avid blindly deleting the line containing the old hostname from /etc/hosts file. Now it will delete the old hostname only if its not localhost or when the hostname is not changing. - How to verify it Bring up SONiC on a device with hostname as localhost Edit /etc/sonic/config_db.json to update the 'hostname' filed under DEVICE_METADATA from "hostname" : "localhost" --> "hostname" : "sonic" run config reload -y to reflect the hostname change done on config_db.json file. cat /etc/hosts and check whether both 127.0.0.1 localhost and 127.0.0.1 sonic entry are present on the file. ping localhost should work fine. - Description for the changelog Make hostname-config service more robust in handling SONiC hostname change from localhost to anything else. 2019-01-18 00:47:19 -06:00			`# Remove the old hostname entry from hosts file.`
			`# But, 'localhost' entry is used by multiple applications. Don't remove it altogether.`
			`if [ $CURRENT_HOSTNAME != "localhost" ] \|\| [ $CURRENT_HOSTNAME == $HOSTNAME ] ; then`
			`sed -i "/\s$CURRENT_HOSTNAME$/d" /etc/hosts`
			`fi`

Add service to config hostname based on configdb (#1174) 2017-11-22 16:36:25 -06:00			`echo "127.0.0.1 $HOSTNAME" >> /etc/hosts`