当OS为rhel6.3通过yum安装时出现依赖包的错误，centOS7安装时没有这样的问题。
[root@qht131 u01]# yum install Percona-XtraDB-Cluster-57
Error: Package: percona-xtrabackup-24-2.4.11-1.el6.x86_64 (percona-release-x86_64)
Requires: libev.so.4()(64bit)
Error: Package: Percona-XtraDB-Cluster-server-57-5.7.21-29.26.1.el6.x86_64 (percona-release-x86_64)
Requires: socat
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
因为percona-xtrabackup依赖libev.so.4()(64bit)的包，而这个包只能从EPEL源(Extra Packages for Enterprise Linux，企业版Linux的额外软件包 是Fedora小组维护的一个软件仓库项目，为RHEL/CentOS提供他们默认不提供的软件包)安装 ,所以只要安装了这个包即可解决问题.
从http://rpmfind.net/linux/rpm2html/search.php上下载libev-4.15-1.el6.rf.x86_64.rpm安装包，然后安装即可
[root@qht131 home]# rpm -ivh libev-4.15-1.el6.rf.x86_64.rpm
warning: libev-4.15-1.el6.rf.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 6b8d79e6: NOKEY
Preparing... ########################################### [100%]
1:libev ########################################### [100%]
从http://rpmfind.net/linux/rpm2html/search.php上下载socat-1.7.2.3-1.el6.x86_64.rpm安装包，这个包有其它的依赖性关系，最简单的方法是用yun localinstall方法安装
[root@qht131 home]# yum localinstall socat-1.7.2.3-1.el6.x86_64.rpm
Loaded plugins: aliases, changelog, downloadonly, presto, product-id, refresh-packagekit, security, subscription-manager,
: tmprepo, verify, versionlock
Updating certificate-based repositories.
Unable to read consumer identity
Setting up Local Package Process
Examining socat-1.7.2.3-1.el6.x86_64.rpm: socat-1.7.2.3-1.el6.x86_64
Marking socat-1.7.2.3-1.el6.x86_64.rpm to be installed
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
Resolving Dependencies
--> Running transaction check
---> Package socat.x86_64 0:1.7.2.3-1.el6 will be installed
--> Processing Dependency: libcrypto.so.10(libcrypto.so.10)(64bit) for package: socat-1.7.2.3-1.el6.x86_64
--> Processing Dependency: libssl.so.10(libssl.so.10)(64bit) for package: socat-1.7.2.3-1.el6.x86_64
--> Running transaction check
---> Package openssl.x86_64 0:1.0.0-20.el6_2.5 will be updated
---> Package openssl.x86_64 0:1.0.1e-57.el6 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
=================================================================================================================================
Package Arch Version Repository Size
=================================================================================================================================
Installing:
socat x86_64 1.7.2.3-1.el6 /socat-1.7.2.3-1.el6.x86_64 910 k
Updating for dependencies:
openssl x86_64 1.0.1e-57.el6 base 1.5 M
Transaction Summary
=================================================================================================================================
Install 1 Package(s)
Upgrade 1 Package(s)
Total size: 2.4 M
Total download size: 1.5 M
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 1.5 M
openssl-1.0.1e-57.el6.x86_64.rpm | 1.5 MB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : openssl-1.0.1e-57.el6.x86_64 1/3
Installing : socat-1.7.2.3-1.el6.x86_64 2/3
Cleanup : openssl-1.0.0-20.el6_2.5.x86_64 3/3
Installed products updated.
Verifying : openssl-1.0.1e-57.el6.x86_64 1/3
Verifying : socat-1.7.2.3-1.el6.x86_64 2/3
Verifying : openssl-1.0.0-20.el6_2.5.x86_64 3/3
Installed:
socat.x86_64 0:1.7.2.3-1.el6
Dependency Updated:
openssl.x86_64 0:1.0.1e-57.el6
Complete!这