Updating the PC-BSD Ports Jail network settings when the system runs dhclient

I have been running the PB-BSD 8.2 and switching between work and home networks.

I have figured out that I have to run these commands when I want to switch over to use wireless:

$
$
$
sudo wpa_cli reassociate
sudo route flush
dhclient wlan0

When switching back to Ethernet, I have use these two commands:

$
$
sudo route flush
sudo dhclient em0

I thought I was done listing the commands that must be run, until I realized that the above commands didn’t change the /etc/resolv.conf in my Ports Jail.

Question: What network settings need updating in the Ports Jail.
Answer: The Ports Jail uses the systems IP Address and Default Route, so only the /etc/resolv.conf needs updated and it appears to be a copy of the system’s /etc/resolv.conf

So I just have to update /etc/resolv.conf and that is all.

Solution

Well, one solution is to run another command that just copies the system’s /etc/resolv.conf to the Port Jail.

# cp /etc/resolv.conf /usr/jails/portjail/etc/resolv.conf

But a better solution is to get dhclient to run this command for us. This can be done with the dhclient-exit-hooks.

Step 1 – Create the dhclient-exit-hooks file and make it executable

$
$
sudo touch /etc/dhclient-exit-hooks
chmod +x /etc/dhclient-exit-hooks

Step 2 – Enter the function into the /etc/dhclient-exit-hooks to run copy command when dhclient exists

#!/bin/sh
cp /etc/resolv.conf /usr/jails/portjail/etc/resolv.conf

Now when you run dhclient, you will also get a new /etc/resolv.conf in your Ports Jail.

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