DOCKER-5

 

                DOCKER-5 (SAVE & RESTORE)   

What we will learn in this post,

·         HOW TO SAVE & RESTORE (IMAGE),

·         HOW TO SAVE & RESTORE (CONTAINER),

DOCKER 4

 

                        DOCKER-4   

What we will learn in this post,

·         HOW TO RUN CONTAINER PROPERLY.

·         HOW TO ACCESS RUNNING CONTAINER.

·         NAME YOUR CONTAINER

·         AUTO RUN AFTER REBOOT

·         ACCESSING RUNNING CONTAINER AND EXIT WITHOUT EXITING CONTAINER

DOCKER-3

 

                 DOCKER-3 (Basic Commands) 

What we will learn in this post,

·         Docker basic commands

·         Run & Pull Docker Images

·         Create container from image

·         See the running or exited containers

·         Remove container & images

·         Running a container

 

DOCKER-2 (INSTALL & BEGIN)

  

                 DOCKER-2 (INSTALL & BEGIN)  

Now we need to install docker,

Below are the pre installation considerations,

1.  Swap should be off

2.  Internet access

3.  Few rpm’s

DOCKER -1

                    DOCKER-1 (BASICS)  

Docker is a set of PAAS (Platform as a Service) which uses OS level virtualization.

Docker images are non-interactive (change not permitted) and reusable

Containers are interactive (change permitted), and we can create image from containers.

Docker architecture:

DOCKER ENGINE: There are three major components,

LINUX(49)- NETWORK TIME PROTOCOL (NTP) -3

               LINUX(49)- NETWORK TIME PROTOCOL (NTP) -3

Now time to consider the commands, output values and configuration file in detail.

Log / Security / troubleshooting

How to know the service ntpd is running or not?

How to check NTP server is alive and responding to ntp queries?

How to check the NTP status?

Understanding output of “ntpq -p”

Important config files related to NTP,

How to check the current ntp configuration status?

What if you wanted your local machine to server as NTP server?

How to use Local Clock as Backup?

How to enable NTP logging?

What is driftfile and drift value?

how to verify ntp process is running or not?

How to update ntp time manually?

How to check the sync and time accuracy?

how to check ntp port 123 is working or not?

LINUX(48)- NETWORK TIME PROTOCOL (NTP) -2

               LINUX(48)- NETWORK TIME PROTOCOL (NTP) -2

We learned about the basics of NTP, now it’s time for configuration.

Here I used RHEL-6 as NTP server for my network and RHEL-7 as client.

The daemon “ntpd” is responsible for ntp service. Whenever the system/service starts the ntpd reads its configuration file /etc/ntp.conf

But before that we need ntp package to be installed on our system.

Check whether it is installed or not,

LINUX (47)- NETWORK TIME PROTOCOL (NTP) -1

               LINUX (47)- NETWORK TIME PROTOCOL (NTP) -1

Network Time Protocol (NTP) is an Internet Protocol used for synchronization of computer clocks with some external time reference for précised timing. Or NTP is a system which is responsible to provide accurate timing to systems across the internet.

NTP is an application layer protocol works within the TCP/IP suite and relies on UDP on port 123.

RHEL6-46– BOOT PROCESS

                            RHEL6-46– BOOT PROCESS  

RHEL 6:

Have you ever thought what happen in between you switch on the power button and prompted for username/password?  

The tasks ran behind are collectively termed as BOOT PROCESS,

It starts after pressing power button,