Shulou(Shulou.com)06/02 Report--

In fact, it is more or less the same to restart apache and mysql services on a regular basis without restarting. The specific steps are as follows: Xikun Cloud Server

Restart apache and mysql services at 12:00 and 16:00 every day

[root@www bin] # cd / opt/

[root@www opt] # vim reboot.txt

Enter the following in the reboot.txt.txt file and save it

0 12 * service httpd restart

0 12 * service mysqld restart

0 16 * service httpd restart

0 16 * service mysqld restart

Add the newly created files to the cron service

[root@www opt] # crontab reboot.txt

[root@www opt] # crontab-l

0 12 * service httpd restart

0 12 * service mysqld restart

0 16 * service httpd restart

0 16 * service mysqld restart

Restart the cron service

[root@www opt] # / sbin/service crond restart

= =

Supplementary note:

Cron is a timed execution tool under linux that can run jobs without human intervention. Because Cron is a built-in service for Linux, but it does not start automatically, you can start and shut down the service in the following ways:

/ sbin/service crond start / / start the service

/ sbin/service crond stop / / shut down the service

/ sbin/service crond restart / / restart the service

/ sbin/service crond reload / / reload the configuration

The basic format of the schedule:

* program

Time-sharing, day, month and week order

Column 1 represents minutes 1: 59 per minute is represented by * or * / 1.

The second column represents the hour 1: 23 (0 means 0 o'clock)

The third column represents the date 1: 31

The fourth column represents the month from January to December.

The fifth column identification number is 0006 (0 means Sunday)

Column 6 commands to run

When column 1 is *, program is run every minute, column 2 means that the program is run every hour, and so on

When listed as aMub, it means that it will be executed from minute a to minute b, while column 2 means that it will be executed from hour a to hour b, and so on.

When the first column is * / n, it is executed every n minutes, the second column is * / n, it is executed every n hours, and so on.

When the first is listed as a, b, c. It means a, b, c, etc. Minutes to be executed, the second column is a, b, c. It means a, b, c. 3 hours to execute, other analogies

Some examples of crontab files:

30 21 * / usr/local/etc/rc.d/lighttpd restart

The above example shows that lighttpd is restarted at 21:30 every night.

45-4-1-10-10-22 * / usr/local/etc/rc.d/lighttpd restart

The above example shows that lighttpd is restarted at 4: 45 on the 1st, 10th, and 22nd of each month.

10 1 * * 6 0 / usr/local/etc/rc.d/lighttpd restart

The above example shows that lighttpd is restarted at 1: 10 every Saturday and Sunday.

0pr 30 18-23 * / usr/local/etc/rc.d/lighttpd restart

The above example shows that lighttpd is restarted every 30 minutes between 18: 00 and 23: 00 every day.

0 23 * * 6 / usr/local/etc/rc.d/lighttpd restart

The above example shows that lighttpd is restarted at 11: 00 pm every Saturday.

* * / 1 * / usr/local/etc/rc.d/lighttpd restart

Restart lighttpd every hour

* 23-7bat 1 * / usr/local/etc/rc.d/lighttpd restart

Restart lighttpd every other hour between 11:00 and 7 a.m.

0 11 4 * mon-wed / usr/local/etc/rc.d/lighttpd restart

Restart lighttpd on the 4th of each month and 11:00 from Monday to Wednesday

0 4 1 jan * / usr/local/etc/rc.d/lighttpd restart

Restart lighttpd at 4: 00 on January 1st

If you need to restart the server, add a line 0 12 * root init 6

Make a mark. After all, saving exit and not saving exit are often used in linux vi editors.

Linux vi save exit operation: ESC key, enter: wq

Linux vi does not save the exit operation: ESC key, type: Q!

It is natural to use VIM to program under linux.

At the beginning, I was also uncomfortable with VI's too many instructions and giving up the mouse completely!

But after the initial adaptation stage, I finally found that I gave up the mouse but also improved the efficiency!

Cut the crap and get to the point:

``(the point above TAB): return to the position before the cursor jumps.

Dd: delete a row.

5dd: delete the five lines below the cursor.

Press V to enter visual mode, select the content you want to copy, press yy to copy the selected content, and press p to copy the content to the new cursor or new file where needed.

I: enter insert mode.

V: enter visual mode.

Esc: back to basic mode

H _ focus _ j _ r _ l: move the cursor up and down, left and right.

Vsp: split the window left and right.

Sp: split the window up and down.

Ctrl+w: select in the window.

: Qquit: exit is not saved.

X: save exit.

W: save only and don't quit.

X: delete a character.

U: undo

CTRL+O: bounce back.

CTRL+R: undo the previous undo.

: help: help.

Zz: exit the help window.

3w: move three words forward.

3b: move back three words.

CTRL+ [: skip to the cursor word.

CTRL+T: jump back?

9k: move up nine lines.

: e Open a new file (useful in multi-window operations).

Yaw: copy a word.

CTRL+B: move the cursor to the left head of the current line.

CTRL+E: move the cursor to the first right of the current line.

Vim-r doc.txt: restore files to pre-modification.

: / find the word

H: skip to the first line.

M: jump? Middle.

L: skip to the last line.

CTRL+d,u,f,b: move half screen down, half screen up, one screen down, one screen up.

Gg: to the beginning of the file

G: to the end of the file.

-: find the last modification point of the file.

CTRL+p,n: query one up? Word, look up a word down.

Zo: open the fold. The l key is also fine.

Zc: turns off folding.

Zr: open and fold all.

Zm: turn off folding all.

Zf: create a fold.

ZR: turn on all collapses (including nesting)

ZM: turn off all collapses (including nesting)

:! ls, view the catalog table.

: `o, find the last modified file.

Wq, save exit.

Vim txt1 txt2 txt3 txt4, opening multiple files at the same time

The following is to open multiple texts at the same time? When (multiple windows are recommended)

N, next file

N3, go down to the third file.

First, the first file.

Last, the last file.

: / s#kkk#ccc#g, replace the kkk in the file with ccc

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