Today while configuring another production CentOS 5.5 machine I ran into a problem where memcached refused to install.

[root@localhost ~]# yum install memcached
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* rpmforge: apt.sw.be
rpmforge | 1.1 kB 00:00
rpmforge/primary | 2.2 MB 00:01
rpmforge 10361/10361
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package memcached.i386 0:1.4.5-1.el5.rf set to be updated
--> Processing Dependency: perl(AnyEvent) for package: memcached
--> Processing Dependency: perl(AnyEvent::Socket) for package: memcached
--> Processing Dependency: perl(AnyEvent::Handle) for package: memcached
--> Processing Dependency: libevent-1.1a.so.1 for package: memcached
--> Processing Dependency: perl(YAML) for package: memcached
--> Processing Dependency: perl(Term::ReadKey) for package: memcached
--> Running transaction check
---> Package compat-libevent-11a.i386 0:3.2.1-1.el5.rf set to be updated
---> Package perl-AnyEvent.noarch 0:5.240-1.el5.rf set to be updated
--> Processing Dependency: perl(JSON::XS) >= 2.2 for package: perl-AnyEvent
--> Processing Dependency: perl(JSON) >= 2.09 for package: perl-AnyEvent
--> Processing Dependency: perl(EV) >= 3.05 for package: perl-AnyEvent
--> Processing Dependency: perl(Guard) >= 1.02 for package: perl-AnyEvent
--> Processing Dependency: perl(Net::SSLeay) >= 1.33 for package: perl-AnyEvent
---> Package perl-TermReadKey.i386 0:2.30-3.el5.rf set to be updated
---> Package perl-YAML.noarch 0:0.71-1.el5.rf set to be updated
--> Running transaction check
---> Package perl-AnyEvent.noarch 0:5.240-1.el5.rf set to be updated
--> Processing Dependency: perl(Net::SSLeay) >= 1.33 for package: perl-AnyEvent
---> Package perl-EV.i386 0:3.9-1.el5.rf set to be updated
--> Processing Dependency: perl(common::sense) for package: perl-EV
---> Package perl-Guard.i386 0:1.021-1.el5.rf set to be updated
---> Package perl-JSON.noarch 0:2.17-1.el5.rf set to be updated
---> Package perl-JSON-XS.i386 0:2.27-1.el5.rf set to be updated
--> Running transaction check
---> Package perl-AnyEvent.noarch 0:5.240-1.el5.rf set to be updated
--> Processing Dependency: perl(Net::SSLeay) >= 1.33 for package: perl-AnyEvent
---> Package perl-common-sense.i386 0:3.0-1.el5.rf set to be updated
--> Finished Dependency Resolution
perl-AnyEvent-5.240-1.el5.rf.noarch from rpmforge has depsolving problems
--> Missing Dependency: perl(Net::SSLeay) >= 1.33 is needed by package perl-AnyEvent-5.240-1.el5.rf.noarch (rpmforge)
Error: Missing Dependency: perl(Net::SSLeay) >= 1.33 is needed by package perl-AnyEvent-5.240-1.el5.rf.noarch (rpmforge)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.

CentOS’s yum repository doesn’t have the latest perl-Net-SSLeay and perl-IO-Socket-SSL packages that are required by memcached. I did some Googling to find that others were experiencing a similar problem without resolution. Here’s the simple fix:

First, remove the old perl modules. Then download and install the newer versions that memcached requires.

rpm-e perl-Net-SSLeay-1.30-4.fc6
rpm -e perl-IO-Socket-SSL-1.01-1.fc6
wget http://packages.sw.be/perl-Net-SSLeay/perl-Net-SSLeay-1.36-1.el5.rfx.i386.rpm
wget http://packages.sw.be/perl-Net-SSLeay/perl-Net-SSLeay-1.36-1.el5.rfx.x86_64.rpm
wget http://packages.sw.be/perl-IO-Socket-SSL/perl-IO-Socket-SSL-1.34-1.el5.rfx.noarch.rpm
rpm -i perl-Net-SSLeay-1.36-1.el5.rfx.x86_64.rpm
rpm -i perl-Net-SSLeay-1.36-1.el5.rfx.i386.rpm
rpm -i perl-IO-Socket-SSL-1.34-1.el5.rfx.noarch.rpm

Now you should be able to install memcached without error.

yum -y install memcached

If you experience an error removing either of the packages then you can try greping to see if you have other versions installed.

rpm -qa | grep perl-Net-SSLeay

and

rpm -qa | grep perl-IO-Socket-SSL