Updating the applicationNow we are going to update your application. Normally, we would expect that you specify a higher version of the Docker image into unit file. But instead of changing the version of the image to be executed change the value of the environment variable RELEASE in the unit template file paas-monitor\@.service. [bash] sed -i -e ‘s/–env RELEASE=[^ ]*/–env RELEASE=v2/’ paas-monit
![Rolling upgrade of Docker applications using CoreOS and Consul](https://cdn-ak-scissors.b.st-hatena.com/image/square/0620252091118f918aaed67552031e716abe29db/height=288;version=1;width=512/https%3A%2F%2Fstorage.googleapis.com%2Fxebia-blog%2F1%2F2015%2F04%2Fcoreos-caas1.png)