linux - Multiple httpd processes running in Docker Container -

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this dockerfile created installing httpd on centos:

#installing httpd centos:latest maintainer xxx@gmail.com run yum install -y httpd expose 80 #entrypoint ["systemctl"] entrypoint ["/usr/sbin/httpd"]

after building, when run container can see many httpd process running inside container:

docker run -d -p 80:80 httpd:4.0 -dforeground

output of docker top command:

uid                 pid                 ppid                c                   stime               tty                 time                cmd root                2457                2443                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2474                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2475                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2476                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2477                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2478                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2491                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2492                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground apache              2493                2457                0                   04:26               ?                   00:00:00            /usr/sbin/httpd -dforeground root                2512                2500                0                   04:27               pts/0               00:00:00            /bin/bash apache              2532                2457                0                   04:27               ?                   00:00:00            /usr/sbin/httpd -dforeground

please let me know why many httpd processes running , how have 1 process pid 1 ?

apache runs multiple processes ready catch client request fast, because spawning server process slow, better have 1 ready when request comes in.
can configure number in httpd.conf through startservers, minspareservers, maxspareservers , serverlimit directives.





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