【Centos8 启动httpd服务】

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# 启动httpd服务
systemctl start httpd.service

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Failed to start httpd.service: Unit httpd.service not found.

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yum install httpd -y
# 报错信息如下：
CentOS Linux 8 - AppStream                                                                                   0.0  B/s |   0  B     01:27    
Errors during downloading metadata for repository 'appstream':
  - Curl error (7): Couldn't connect to server for http://vault.centos.org/centos/8/AppStream/x86_64/os/repodata/repomd.xml [Failed to connect to vault.centos.org port 80: Connection refused]
Error: Failed to download metadata for repo 'appstream': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

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cd /etc/yum.repos.d/
# 查看已存在的repo
ls -l 

# 备份原有repo
mkdir bakup
mv *repo bakup/

# 下载最近repo
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
# 查看下载的repo
ll
# [train@Centos8(4.4) /etc/yum.repos.d]$ ls -lh
# total 8.0K
# drwxr-xr-x. 2 root root 4.0K Mar  4 22:19 bakup
# -rw-r--r--. 1 root root 2.5K Feb 14 21:16 CentOS-Base.repo

# 运行 yum makecache 生成缓存
yum makecache
# CentOS-8.5.2111 - Base - mirrors.aliyun.com                                                                  1.5 MB/s | 4.6 MB     00:03    
# CentOS-8.5.2111 - Extras - mirrors.aliyun.com                                                                 63 kB/s |  10 kB     00:00    
# CentOS-8.5.2111 - AppStream - mirrors.aliyun.com                                                             271 kB/s | 8.4 MB     00:31    
# Last metadata expiration check: 0:00:01 ago on Fri 04 Mar 2022 10:20:24 PM CST.
# Metadata cache created.

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sudo yum install httpd
# 启用网站服务
systemctl start httpd.service                
# 设置服务开机启动
systemctl enable httpd.service