Linux 配置yum源.
环境：虚拟机中安装了RedHat ，在进行安装mariadb的时候，出现如下错误。是因为yum源的问题，需要进行配置yum源。本教程是配置本地yum源。
1 [root@localhost yum.repos.d]# yum groups install mariadb mariadb-client -y 2 Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager 3 This system is not registered with an entitlement server. You can use subscription-manager to register. 4 There are no enabled repos. 5 Run "yum repolist all" to see the repos you have. 6 To enable Red Hat Subscription Management repositories: 7 subscription-manager repos --enable <repo> 8 To enable custom repositories: 9 yum-config-manager --enable <repo>
选中虚拟机中的操作系统，鼠标：右键-->>设置
在弹出的“虚拟机设置” 窗口中，选择：CD/DVD -->>设备状态（已连接，确保打上勾即可）
在Linux的终端输入：mount 指令，可以查看到有块设备被加载进来了,见红色标注，相关信息如下：
1 [root@localhost yum.repos.d]# mount 2 sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel) 3 proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) 4 devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=917580k,nr_inodes=229395,mode=755) 5 securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) 6 tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel) 7 devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000) 8 tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755) 9 tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,seclabel,mode=755) 10 cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd) 11 pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) 12 cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) 13 cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) 14 cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) 15 cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) 16 cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu) 17 cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) 18 cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) 19 cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset) 20 cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls) 21 cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids) 22 configfs on /sys/kernel/config type configfs (rw,relatime) 23 /dev/mapper/rhel-root on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota) 24 selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime) 25 systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=13695) 26 hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel) 27 debugfs on /sys/kernel/debug type debugfs (rw,relatime) 28 mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel) 29 nfsd on /proc/fs/nfsd type nfsd (rw,relatime) 30 /dev/sda1 on /boot type xfs (rw,relatime,seclabel,attr2,inode64,noquota) 31 sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime) 32 tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=186704k,mode=700,uid=1000,gid=1000) 33 fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) 34 gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000) 35 tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=186704k,mode=700) 36 /dev/sr0 on /run/media/hk-super/RHEL-7.4 Server.x86_64 type iso9660 (ro,nosuid,nodev,relatime,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500,uhelper=udisks2)
使用root账号（切换root指令：su - root），在/mnt 目录下创建一个目录。
指令： mkdir /mnt/dvd
然后卸载/dev/sr0 ，然后挂在到/mnt/dvd ，进入的/mnt/dvd，就可以查看到镜像内的文件了。
相关指令如下：
卸载： umount /dev/sr0
重新挂在: mount /dev/sr0 /mnt/dvd
进入dvd目录: cd /mnt/dvd（此时也进入到镜像文件内了）
查看镜像内的文件：ls -l ( l是字母 )
镜像加载到Linux之后，开始配置repo文件，相关指令如下：
cd /etc/yum.repos.d/
vim hello.repo (名字随便起，但后缀名必须是：.repo)
hello.repo 文件内容如下：
1 [base] 2 name=base 3 baseurl=file:///mnt/dvd 4 enabled=1 5 gpgcheck=0
然后分别输入如下指令：
yum clean all
yum makecache
1 [root@localhost yum.repos.d]# yum clean all 2 Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager 3 This system is not registered with an entitlement server. You can use subscription-manager to register. 4 Cleaning repos: base 5 Cleaning up everything 6 Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos 7 [root@localhost yum.repos.d]# 8 [root@localhost yum.repos.d]# 9 [root@localhost yum.repos.d]# 10 [root@localhost yum.repos.d]# yum makecache 11 Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager 12 This system is not registered with an entitlement server. You can use subscription-manager to register. 13 base | 4.1 kB 00:00:00 14 (1/5): base/filelists_db | 3.4 MB 00:00:00 15 (2/5): base/group_gz | 137 kB 00:00:00 16 (3/5): base/other_db | 1.5 MB 00:00:00 17 (4/5): base/productid | 1.6 kB 00:00:00 18 (5/5): base/primary_db | 4.0 MB 00:00:00 19 Metadata Cache Created 20 [root@localhost yum.repos.d]#
上面操作反显的日志，说明yum源配置完成。
然后再次输入安装指令：yum groups install mariadb mariadb-client -y 无报错信息，marridb安装成功。
如有问题，欢迎纠正！！！
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