First acquaintance with apache service (1) --- Compile and install httpd 2.4 based on CentOS 7

APR: Apache portable Run-time libraries , Apache portable runtime libraries, mainly to provide upper-level applications with a low-level support interface library that can be used across multiple operating system platforms.
Environmental preparation:
CentOS7
installation package preparation:
main package: httpd-2.4.46.tar.gz
dependent package: apr-1.7.0.tar.gz, apr-util-1.6.1.tar.gz
related installation packages

yum -y install gcc make pcre-devel openssl-devel expat-devel

Unzip the installation package to /usr/local

tar xf apr-1.7.0.tar.gz -C /usr/local/
tar xf apr-util-1.6.1.tar.gz -C /usr/local/
tar xf httpd-2.4.46.tar.gz  -C /usr/local/

Merging the source code of apr and apr-util with the source code of httpd

cd /usr/local/
mv apr-1.7.0/ httpd-2.4.46/srclib/apr
mv apr-util-1.6.1/ httpd-2.4.46/srclib/apr-util

[root@centos7 ~]#ll /usr/local/httpd-2.4.46/srclib/
total 16
drwxr-xr-x. 28 1001 1001 4096 Jan 22 09:31 apr
drwxr-xr-x. 21 1001 1001 4096 Jan 22 09:31 apr-util
-rw-r--r--.  1 root   40  121 Feb 11  2005 Makefile.in

Compile and install the three together

cd httpd-2.4.46
./configure \
--prefix=/app/httpd24 \  #设置安装位置
--enable-so \  #让apache核心装载DSO
--enable-ssl \ #开启SSL功能
--enable-cgi \ #实现CGI
--enable-rewrite \ #开启重读功能
--with-zlib \ #指定zlib压缩
--with-pcre \ #指定prec库
--with-included-apr \ #指定APR库
--enable-modules=most \  #开启绝大多数模块
--enable-mpms-shared=all \
--with-mpm=prefork #工作模式：prefork
make -j '可根据自己PC CPU内核按需设置，加快编译速度' && make install

Create a dedicated user

useradd -s /sbin/nologin -r apache

Specify the user running httpd

vim /app/httpd24/conf/httpd
user apache
group apache

Configure environment variables

echo 'PATH=/app/httpd24/bin:$PATH' > /etc/profile.d/http24.sh
. /etc/profile.d/http24.sh

Create a service unit file and set it to boot

vim /usr/lib/systemd/system/httpd.service
[Unit]
Description=The Apache HTTP Server
After=network.target remote-fs.target nss-lookup.target
Documentation=man:httpd(8)
Documentation=man:apachectl(8)
[Service]
Type=forking
#EnvironmentFile=/etc/sysconfig/httpd
ExecStart=/app/httpd24/bin/apachectl start
#ExecStart=/app/httpd24/bin/httpd $OPTIONS -k start
ExecReload=/app/httpd24/bin/apachectl graceful
#ExecReload=/app/httpd24/bin/httpd $OPTIONS -k graceful
ExecStop=/app/httpd24/bin/apachectl stop
KillSignal=SIGCONT
PrivateTmp=true
[Install]
WantedBy=multi-user.target

systemctl enable --now  httpd

Configure man help

vim /etc/man_db.conf
MANDATORY_MANPATH           /app/httpd24/man