• Protect the /etc/resolv.conf file

  chattr +i /etc/resolv.conf
  

Problem: A user complained that his account was lockouted frequencely. He changed password several days ago.

By default, the Windows server 2016 enables MapsBroker, OneSyncSvc and WbioSrvc services. Those services may be stopped for some reason and they causes error messages on dashboard. It’s kind of noisy. Use the following command to disable them in Command Prompt (Admin).

Allow port 6000 incoming traffic on Windows firewall. If there are multiple displays, the server listens on port 6001, 6002, etc.

Requirement:

// Should not match
''
' '
'  '
'   '
// Should match
'one-word'
'one-word '
' one-word'
' one-word '
'one phrase with whitespace'
'one phrase with whitespace '
' one phrase with whitespace'
' one phrase with whitespace '

Usually all servers need to be reboot mannually instead of do it automatically because we need to make sure all services are online after reboot. I cannot find Download only option on GUI Windows Update Settings on Windows Server 2016. But we can run command sconfig with admintrators privilege to change it.

What is generator in Python?

• A simple way of creating iterators
• A function with yield statement instead of return statement. It can have mutilple yield statements.
• Iterator methods __iter__() and __next__() are implemented automatically.
• yield statement pauses the function saving all its states and later continues from there on successive calls.
• When called, it returns an object (iterator) but does not start execution immediately.

Consider writing unit tests:

Two useful links about coding principles:

• The Principles Of Good Programming
• From STUPID to SOLID Code!

Temperary to change as Function key

Hold Search key and press keys