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am-/set-hostname-for-docker-container.sh

Created April 7, 2017 08:08
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Dynamically determine the IP address of a Docker container and change the /etc/hosts accordingly
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set-hostname-for-docker-container.sh
#!/bin/sh
# Assumption 1: $CONTAINER and $HOST are properly set
# Assumption 2: The host is already set in /etc/hosts.
# Assumption 3: In /etc/hosts, the IP address and host are separated by a tab
IP=`docker exec -t $CONTAINER ip addr | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b" | grep 172`
sudo sed -i "/$HOST/s/[^\t]*/$IP/" /etc/hosts
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