Hello, I have used Mesosphere Zookeeper RPM and it uses After=network.target in its zookeeper.service systemd unit file. This doesn't guarantee that Zookeeper service will start after network is available. To ensure this After=network-online.target should be used. I spent some time with this when Zookeeper was disconnected after reboots because of delays during reboot on my VMs. If Centos starts up fast, which it typically does on a clean install, it doesn't manifest as a problem. Actually I have experienced it on RHEL with some custom company layer on top which introduced these delays.
I would recommend to change it to avoid some bad user experience with slow VMs. As well I think it is better for production. Or are there any reasons why not? I used mesosphere-zookeeper.x86_64 3.4.6-0.1.20141204175332.centos7 version. Regards, Petr
