A主机：centos7，B主机：centos6

1.查看防火墙

并关闭防火墙

  1. iptables -nvL
  3. 关闭iptables
  4. centos7:
  5. systemctl stop firewalld
  6. systemctl disable firewalld
  7. centos6:
  8. chkconfig iptables off
  9. service iptables stop

2.A主机

  1. 关闭SELinux
  2. sed -i.bak 's@SELINUX=enforcing@SELINUX=permissive@' /etc/selinux/config
  3. setenforce 0
  4. getenforce
  6. vm虚拟机再添加一块光盘（下面host0不行可试1、2等）不关机显示（这里第一个光盘是centos6）
  7. echo '- - -' > /sys/class/scsi_host/host0/scan
  8. lsblk
  10. 共享（vsftpd已安装）
  11. systemctl start vsftpd  现在启动
  12. systemctl enable vsftpd 下次开机自动启动
  13. cd /var/ftp/pub/
  14. mkdir -pv centos/6/os/x86_64/
  15. mkdir -pv centos/7/os/x86_64/
  16. mount /dev/sr0 /var/ftp/pub/centos/6/os/x86_64/
  17. mount /dev/sr1 /var/ftp/pub/centos/7/os/x86_64/
  19. 访问 ftp://192.168.255.129/pub/
  21. 客户端配置
  22. cat /etc/yum.repos.d/base.repo
  23. [base]
  24. name=ftp centos7.5
  25. baseurl=file:///var/ftp/pub/centos/$releasever/os/$basearch/
  26. gpgcheck=0

3.B主机

  1. 客户端配置
  2. cat /etc/yum.repos.d/base.repo
  3. [base]
  4. name=ftp centos6.9
  5. baseurl=ftp://192.168.0.23/pub/centos/$releasever/os/$basearch/
  6. gpgcheck=0

4.自定义第三方仓库

  1. 在A主机基础上
  2. cd /var/ftp/pub/
  3. mkdir app
  4. cd app/
  5. cp /misc/cd/Packages/tree-1.6.0-10.el7.x86_64.rpm .
  6. createrepo /var/ftp/pub/app/        每次删减包重建仓库
  7. yum clean all
  9. cat /etc/yum.repos.d/base.repo
  10. [app]
  11. name=app
  12. baseurl=ftp://192.168.0.23/pub/app
  13. #or baseurl=file:///var/ftp/pub/app
  14. gpgcheck=0

5.判断包是否安装，若未安装就yum安装

  1. package=httpd;rpm -q $package  &> /dev/null || yum install $package -y &> /dev/null