ETCD

Describe what is ETCD

It is a database that store the data of container and the data of cluster such as Node , Pod, Config Map, Secret, Account , Role and etc with key-value format. The Advantage of Key-value DB: Example:

ID	Name
1	Bob
2	Sam
3	Tony

If you want to add new column in Table it will not affect to existing record in table

ID	Name
1	Bob
2	Sam
3	Tony

ID	Name	Age
4	Jane	20

But If we use relational DB every record in table will need to determine the Age value

Noted:

If you setup cluster manually , you need to download ETCD binary file and install on Master Nodeby yourself. Each Master Node will separate ETCD but we are able to configure parameter to sync the data across Node .