If you would like to remove the specific character or replacing string in the particular file by the command.

On the previous post described add known hosts automatically and this is multiple ssh login with the execute the command once logged.

If your want to hash a password use mkpasswd command, it is very helpful to generate encrypted password through Linux command,

Yes, its possible to add host entry to known_hosts automatically without give a yes word.

On the previous post we described HAproxy installation, now configure TCP secure connections with Username and password. HAProxy provides an Userlists, Group and User options.

HAProxy is an open source, it's a very fast and reliable solution for Load balancing, high availability and proxying for TCP and HTTP. This is suitable for high traffic websites and the most visited ones.

Zookeeper is an open-source coordination service for distributed applications and can build upon to implement higher level services configuration maintenance, group, naming and synchronization. For more information refer the Zookeeper page.