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reposync 通过YUM下载安装包的方式同步远程YUM存储库到本地目录
用法：
reposync [options]选项：
Options:
-h, --help show this help message and exit
-c CONFIG, --config=CONFIG
config file to use (defaults to /etc/yum.conf)
-a ARCH, --arch=ARCH act as if running the specified arch (default: current
arch, note: does not override $releasever)
-r REPOID, --repoid=REPOID
specify repo ids to query, can be specified multiple
times (default is all enabled)
-e CACHEDIR, --cachedir=CACHEDIR
directory in which to store metadata
-t, --tempcache Use a temp dir for storing/accessing yum-cache
-d, --delete delete local packages no longer present in repository
-p DESTDIR, --download_path=DESTDIR
Path to download packages to: defaults to current dir
-g, --gpgcheck Remove packages that fail GPG signature checking after
downloading
-u, --urls Just list urls of what would be downloaded, don't
download
-n, --newest-only Download only newest packages per-repo
-q, --quiet Output as little as possible
-l, --plugins enable yum plugin support使用以下命令重构元数据是很简单的 createrepos。
同步rubyera存储库的示例用法。
$ reposync --repoid=rubyera
rubyera | 3.2 kB 00:00 ...
[rubyera: 1 of 14 ] Downloading dhcp_probe-1.3.0-2.fc13.x86_64.rpm
[rubyera: 2 of 14 ] Downloading dhcp_probe-1.3.0-4.fc13.x86_64.rpm
[rubyera: 3 of 14 ] Downloading dhcp_probe-1.3.0-3.fc13.x86_64.rpm
[rubyera: 4 of 14 ] Downloading dhcp_probe-debuginfo-1.3.0-2.fc13.x86_64.rpm
[rubyera: 5 of 14 ] Downloading dhcp_probe-debuginfo-1.3.0-4.fc13.x86_64.rpm
[rubyera: 6 of 14 ] Downloading dhcp_probe-debuginfo-1.3.0-3.fc13.x86_64.rpm
[rubyera: 7 of 14 ] Downloading dhcp_probe-debuginfo-1.3.0-1.fc13.x86_64.rpm
[rubyera: 8 of 14 ] Downloading iptables-1.4.5-1.fc12.x86_64.rpm
[rubyera: 9 of 14 ] Downloading iptables-debuginfo-1.4.5-1.fc12.x86_64.rpm
[rubyera: 10 of 14 ] Downloading iptables-devel-1.4.5-1.fc12.x86_64.rpm
[rubyera: 11 of 14 ] Downloading iptables-ipv6-1.4.5-1.fc12.x86_64.rpm
[rubyera: 12 of 14 ] Downloading passenger-2.2.15-1.fc13.x86_64.rpm
[rubyera: 13 of 14 ] Downloading passenger-debuginfo-2.2.15-1.fc13.x86_64.rpm
[rubyera: 14 of 14 ] Downloading rubygem-pg-0.9.0-1.fc13.x86_64.rpm如果你再次尝试同步，
reposync 不会下载现有的软件包，节省带宽。$ reposync --repoid=rubyera
[rubyera: 1 of 14 ] Skipping existing dhcp_probe-1.3.0-2.fc13.x86_64.rpm
[rubyera: 2 of 14 ] Skipping existing dhcp_probe-1.3.0-4.fc13.x86_64.rpm
[rubyera: 3 of 14 ] Skipping existing dhcp_probe-1.3.0-3.fc13.x86_64.rpm
[rubyera: 4 of 14 ] Skipping existing dhcp_probe-debuginfo-1.3.0-2.fc13.x86_64.rpm
[rubyera: 5 of 14 ] Skipping existing dhcp_probe-debuginfo-1.3.0-4.fc13.x86_64.rpm
[rubyera: 6 of 14 ] Skipping existing dhcp_probe-debuginfo-1.3.0-3.fc13.x86_64.rpm
[rubyera: 7 of 14 ] Skipping existing dhcp_probe-debuginfo-1.3.0-1.fc13.x86_64.rpm
[rubyera: 8 of 14 ] Skipping existing iptables-1.4.5-1.fc12.x86_64.rpm
[rubyera: 9 of 14 ] Skipping existing iptables-debuginfo-1.4.5-1.fc12.x86_64.rpm
[rubyera: 10 of 14 ] Skipping existing iptables-devel-1.4.5-1.fc12.x86_64.rpm
[rubyera: 11 of 14 ] Skipping existing iptables-ipv6-1.4.5-1.fc12.x86_64.rpm
[rubyera: 12 of 14 ] Skipping existing passenger-2.2.15-1.fc13.x86_64.rpm
[rubyera: 13 of 14 ] Skipping existing passenger-debuginfo-2.2.15-1.fc13.x86_64.rpm
[rubyera: 14 of 14 ] Skipping existing rubygem-pg-0.9.0-1.fc13.x86_64.rpm个示例是为fedora和fedora-updates存储库创建本地镜像，并将它们本地化。以这种方式安装和升级软件包将非常快速。重要的是保持本地镜像与主存储库每小时运行一次 reposync 和 createrepo需要注意的是，安装包文件不是由reposync下载的，而是用 wget 或 curl下载。
使用 reposync 的好处之一与使用 rsync、ftp 或http 镜像不同，reposync 使用的是镜像站列表。就是说他会从你的下载服务器中的镜像站的列表中去下载，如果实在自动尝试下一个镜像站，而 rsync、ftp或http，都需要手动维护，从一个服务器下载，用 reposync 是完全透明的，并且易于处理故障。
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