问题： 当你进行安装httpd 服务时报错如下：
[root@localhost yum.repos.d]# yum install httpd
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
appstream 0.0 B/s | 0 B 00:00
baseos 0.0 B/s | 0 B 00:00
Failed to synchronize cache for repo 'appstream', ignoring this repo.
Failed to synchronize cache for repo 'baseos', ignoring this repo.
No match for argument: httpd
Error: Unable to find a match
解决方案：
1.检查软件仓库配置的路径
2.检查是否有挂载
解决步骤：
1.挂载
[root@localhost ~]# mkdir /mnt/cdrom
[root@localhost ~]# mount /dev/sr0 /mnt/cdrom/
mount: /mnt/cdrom: WARNING: device write-protected, mounted read-only.
2.配置软件仓库
[root@localhost ~]# cat /etc/yum.repos.d/iso.repo
[baseos]
name = baseos
enabled = yes
baseurl=file:///mnt/cdrom/BaseOS
gpgcheck = 0
[appstream]
name= appstream
baseurl=file:///mnt/cdrom/AppStream
enabled = yes
gpgcheck = 0
验证：再次安装可以成功安装
[root@localhost ~]# yum install httpd -y
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Last metadata expiration check: 0:00:21 ago on Wed 28 Dec 2022 04:50:51 AM EST.
Dependencies resolved.
================================================================================
Package Arch Version Repository
Size
================================================================================
Installing:
httpd x86_64 2.4.37-10.module+el8+2764+7127e69e appstream 1.4 M
Installing dependencies:
redhat-logos-httpd noarch 80.7-1.el8 BaseOS 25 k
apr x86_64 1.6.3-9.el8 appstream 125 k
apr-util x86_64 1.6.1-6.el8 appstream 105 k
httpd-filesystem noarch 2.4.37-10.module+el8+2764+7127e69e appstream 34 k
httpd-tools x86_64 2.4.37-10.module+el8+2764+7127e69e appstream 101 k
mod_http2 x86_64 1.11.3-1.module+el8+2443+605475b7 appstream 156 k
Installing weak dependencies:
apr-util-bdb x86_64 1.6.1-6.el8 appstream 25 k
apr-util-openssl x86_64 1.6.1-6.el8 appstream 27 k
Enabling module streams:
httpd 2.4
Transaction Summary
================================================================================
Install 9 Packages
Total size: 2.0 M
Installed size: 5.4 M
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : apr-1.6.3-9.el8.x86_64 1/9
Running scriptlet: apr-1.6.3-9.el8.x86_64 1/9
Installing : apr-util-bdb-1.6.1-6.el8.x86_64 2/9
Installing : apr-util-openssl-1.6.1-6.el8.x86_64 3/9
Installing : apr-util-1.6.1-6.el8.x86_64 4/9
Running scriptlet: apr-util-1.6.1-6.el8.x86_64 4/9
Installing : httpd-tools-2.4.37-10.module+el8+2764+7127e69e.x86_6 5/9
Running scriptlet: httpd-filesystem-2.4.37-10.module+el8+2764+7127e69e. 6/9
Installing : httpd-filesystem-2.4.37-10.module+el8+2764+7127e69e. 6/9
Installing : redhat-logos-httpd-80.7-1.el8.noarch 7/9
Installing : mod_http2-1.11.3-1.module+el8+2443+605475b7.x86_64 8/9
Installing : httpd-2.4.37-10.module+el8+2764+7127e69e.x86_64 9/9
Running scriptlet: httpd-2.4.37-10.module+el8+2764+7127e69e.x86_64 9/9
Verifying : redhat-logos-httpd-80.7-1.el8.noarch 1/9
Verifying : apr-1.6.3-9.el8.x86_64 2/9
Verifying : apr-util-1.6.1-6.el8.x86_64 3/9
Verifying : apr-util-bdb-1.6.1-6.el8.x86_64 4/9
Verifying : apr-util-openssl-1.6.1-6.el8.x86_64 5/9
Verifying : httpd-2.4.37-10.module+el8+2764+7127e69e.x86_64 6/9
Verifying : httpd-filesystem-2.4.37-10.module+el8+2764+7127e69e. 7/9
Verifying : httpd-tools-2.4.37-10.module+el8+2764+7127e69e.x86_6 8/9
Verifying : mod_http2-1.11.3-1.module+el8+2443+605475b7.x86_64 9/9
Installed products updated.
Installed:
httpd-2.4.37-10.module+el8+2764+7127e69e.x86_64
apr-util-bdb-1.6.1-6.el8.x86_64
apr-util-openssl-1.6.1-6.el8.x86_64
redhat-logos-httpd-80.7-1.el8.noarch
apr-1.6.3-9.el8.x86_64
apr-util-1.6.1-6.el8.x86_64
httpd-filesystem-2.4.37-10.module+el8+2764+7127e69e.noarch
httpd-tools-2.4.37-10.module+el8+2764+7127e69e.x86_64
mod_http2-1.11.3-1.module+el8+2443+605475b7.x86_64
Complete!