Apache cannot start.

Question

It was fine yesterday, but it won't start today.

The test port is

Your port 80 is not actually used.

Answer 1

Check the occupancy of port 80 under Linux
netstat –anp | grep 80
Then according to the displayed content, check the process number occupying port 80
For example:
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1253/unknow
Here 1253 is the pid/process number.
Let’s kill him:
kill -s 9 1253

Then start your apache and try it.

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Windows Check port 80 occupied
Summon task manager:

Tick ​​the PID box

Enter cmd and enter
netstat -ano | findstr "80"

Here 3740 is the process number that occupies 80, then find the corresponding process in the task manager and delete it ٩(×̯×)۶
Try starting apache again.