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Add DHCP client hook to update hostname. #235

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merged 3 commits into from
Feb 2, 2017
Merged

Add DHCP client hook to update hostname. #235

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9aad66b
Add DHCP client hook to update hostname.
oleksandrivantsiv Feb 1, 2017
3b4c191
Remove interface checking
oleksandrivantsiv Feb 2, 2017
e8d7ce3
Update hostname in /etc/hosts file
oleksandrivantsiv Feb 2, 2017
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1 change: 1 addition & 0 deletions build_debian.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,7 @@ iface eth0 inet dhcp
EOF

sudo cp files/dhcp/rfc3442-classless-routes $FILESYSTEM_ROOT/etc/dhcp/dhclient-exit-hooks.d
sudo cp files/dhcp/sethostname $FILESYSTEM_ROOT/etc/dhcp/dhclient-exit-hooks.d/

if [ -f sonic_debian_extension.sh ]; then
./sonic_debian_extension.sh $FILESYSTEM_ROOT
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21 changes: 21 additions & 0 deletions files/dhcp/sethostname
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
#!/bin/bash
# This script is to update hostname of the system.

if [ "$reason" != BOUND ] && [ "$reason" != RENEW ] \
&& [ "$reason" != REBIND ] && [ "$reason" != REBOOT ]
then
exit 0
fi

if [ "$interface" != "eth0" ] && [ "$interface" != "eth1" ]
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I feel this check is not needed since in our configuration we only do dhcp on eth0. We are not doing dhcp on other interfaces. If we decided to do dhcp on other interfaces, we'll explicit define that in the /etc/network/interfaces and won't need to add check here.

then
exit 0
fi

current_host_name=`hostname -s`

if [ "$current_host_name" != "$new_host_name" ]
then
echo $new_host_name > /etc/hostname
hostname -F /etc/hostname
fi