Kubernetes Demo

Pre-requisites

1. Pre-configurations on Unity.

   1. Create a Pool and a NasServer.

      NOTE: the NFSv4 needs to be enabled on the NasServer.

   2. Create hosts for the K8S nodes, k8s-node1 and k8s-node2 and manually register the initiators. Use below command to view the initiator name:

   $ cat /etc/iscsi/initiatorname.iscsi
   InitiatorName=iqn.<rest of host iscsi initiator>
   

2. The docker daemon on all Nodes in K8S should be configured with DNS.

   sudo vim /etc/docker/daemon.json
   
   { 
       "dns": ["10.245.174.10"]
   }
   
   sudo systemctl restart docker.service
   

References

• Container image: quay.io/murray_liang/unity-csi
• Code repo: https://github.com/Murray-LIANG/unity-csi

Commands:

Mount type volumes

$ kubectl run -it --rm --image=mysql:5.6 --restart=Never mysql-client -- bash

$ # Use the ip of `kubectl describe pods mysql-745d95675c-c4kmx`
$ mysql -h 10.244.2.13 -p
password

$ mysql> use mysql

$ mysql> create table my_id(id int(4));

$ mysql> insert my_id values(111);

$ mysql> select * from my_id;

# Shutdown the Node

# Monitor the service is up on another Pod and Node.

Raw block type volumes

# fdisk /dev/xvda
n
w
# mkfs.ext4 /dev/xvda
# mkdir /mnt/data
# mount /dev/xvda /mnt/data

Or use dd

# dd if=/dev/zero of=/dev/xvda bs=2MB count=1K