How to Check a Dock Before Destruction

Docks don't just fail, there's always a root cause. Many times the "solution" to fixing a dock is to simply destroy it and replace it with a fresh and shiny new instance. To aid our understanding of the dock failure scenarios please follow this guide to get information about why the dock may have failed.

I. Memory / Inodes / Disk Usage

From the dock, run and record the output of the following:

• Memory usage: free -ght
• Disk usage: df -h
• Inodes: df -hi

II. Swarm + Weave + Registry Containers

Copy and record the results of the following command:

• sudo docker ps | grep swarm && sudo docker ps | grep weave sudo && docker ps | grep registry

You should see exactly three containers.

III. Docker Logs

Download the logs from: /var/log/upstart/docker*

IV. Dock Init Logs

Download the dock-init logs: /var/log/user-script-dock-init.log

V. Krain

Download the logs: /var/log/krain.log