Today, I know that I am a person who has been poisoned by Red Hat!

Source: Internet
Author: User

The story is about whether to set MySQL to run automatically after it is installed in Ubuntu...

1. My Ubuntu version:

[Xport @ ubuntu ~] $ Uname-
Linux ubuntu 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006 i686 GNU/Linux

2. Set the MySQL service to automatic and then cancel Automatic operation. Sample/etc/rc ?. D directory changes:

/* Set the MySQL service to run automatically */
[Xport @ ubuntu ~] $ Ls-l/etc/rc ?. D/* mysql *>./Temp/mysql-service-enable.txt
/* Cancel the automatic running of MySQL Service */
[Xport @ ubuntu ~] $ Ls-l/etc/rc ?. D/* mysql *>./Temp/mysql-service-disable.txt
/* Compare the content of the two files */
[Xport @ ubuntu ~] $ Diff./Temp/mysql-service-enable.txt./Temp/mysql-service-disable.txt
7, 9d6
<Lrwxrwxrwx 1 Root 15/etc/rc2.d/s50mysql-> ../init. d/MySQL
<Lrwxrwxrwx 1 Root 19/etc/rc2.d/S50mysql-ndb-> ../init. d/MySQL-NDB
<Lrwxrwxrwx 1 Root 23/etc/rc2.d/S50mysql-ndb-mgm-> ../init. d/MySQL-NDB-MGM

3. The directory/etc/rc2.d is changed. Is the default runlevel of Ubuntu 2?

Check it out ...!

[Xport @ Ubuntu ~] $/Sbin/runlevel
N 2

4. What I know about runlevel is as follows (Red Hat has been poisoned too deeply by a joke ):

  • 0-Halt
  • 1-Single
  • 2-Not used/User definable
  • 3-Full multi-user NO display manager
  • 4-Not used/User definable
  • 5-Full multi-user with display manager (GUI)
  • 6-Reboot

I posted a post and asked about Ubuntu to know that Debian/Ubuntu has been started by default with runlevel 2.
The specific definition is as follows:

  • 0-Halt
  • 1-Single
  • 2-Full multi-user with display manager (GUI)
  • 3-Full multi-user with display manager (GUI)
  • 4-Full multi-user with display manager (GUI)
  • 5-Full multi-user with display manager (GUI)
  • 6-Reboot

Debian/Ubuntu 2 ~ There is no difference in runlevel 5!

Finally, I can only lament the benefits of the standard! Openness is a good thing, but excessive freedom brings a lot of confusion to users. users need to spend more time to understand, maybe this "Wheel" was not re-invented, but he used a new "tire!

Therefore, it is best to remember:

Every distribution seems to have a different boot-up method.

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