Real Life Scenario: It is Thanksgiving weekend and no one should be in the offic

Question

Real Life Scenario: It is Thanksgiving weekend and no one should be in the office due to the holiday. A scheduled maintenance window of 2 AM to 6 AM has been communicated and a scheduled change will shortly be underway. Approvals have been received from the change board and management for this important change. It is crucial that no users are in the system when this change is taking place. A user comes into the building and says that they need to run a report and they were unaware of the system outage.

Write a short checklist including 1) communications to all the users when system maintenance begins and ends 2) the appropriate run level for beginning the system maintenance (you are on-site at the console and have full access) 3) the Linux command for checking to see if any users are in the system and any network activity (research it) 4) the run level when system maintenance has ended. Then write a short paragraph explaining to the user who came into the building on Thanksgiving weekend the best course of action now that they are there in the building and in need of running a report.

Explanation / Answer

1)Communications to all the users when system maintenance begins and ends

Hello All,

This is to Notify, We have maintenance window of 2 AM to 6 AM has been communicated and a scheduled change will shortly be underway.

CM reference below     

https://xyz.com/CR#

Start date:- 27-Sep-2017 02:00

End data:- 28-Sep-2017 06:00

This activity is to test the fail-over of XYZ services and equipment (Networking, Core Services, and Power).The purpose of this change is to test the fail-over and record results of the outage for all services and equipment (Networking, Core Services, and Power).

2)the appropriate run level for beginning the system maintenance (you are on-site at the console and have full access)

Run Level 1 is the appropriate one as it is basically Single User mode, no daemons (services) are started. Hopefully single user mode will allow you to fix whatever made the transition to rescue mode necessary.

3)the Linux command for checking to see if any users are in the system and any network activity

The who command is used to check for the users login currently to the system.

4)the run level when system maintenance has ended

Run levels 2 through 5 are full multi-user mode and are the same in a overall Linux system. It is a common practise in other Linux distributions to use run level 3 for a text console login and run level 5 for a graphical login.

Thanks for asking the question, Please let me know if you have any queries will be glad to help

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