Acabei de fazer o que você disse que fez, em uma instalação limpa do C6, e funcionou bem:
[me@angband ~]$ sudo rpm -ivh https://download.postgresql.org/pub/repos/yum/9.5/redhat/rhel-6-x86_64/pgdg-centos95-9.5-3.noarch.rpm
Retrieving https://download.postgresql.org/pub/repos/yum/9.5/redhat/rhel-6-x86_64/pgdg-centos95-9.5-3.noarch.rpm
warning: /var/tmp/rpm-tmp.YH2GD1: Header V4 DSA/SHA1 Signature, key ID 442df0f8: NOKEY
Preparing... ########################################### [100%]
1:pgdg-centos95 ########################################### [100%]
[me@angband ~]$ sudo yum install postgresql95-server
[...]
Resolving Dependencies
--> Running transaction check
---> Package postgresql95-server.x86_64 0:9.5.9-1PGDG.rhel6 will be installed
--> Processing Dependency: postgresql95-libs(x86-64) = 9.5.9-1PGDG.rhel6 for package: postgresql95-server-9.5.9-1PGDG.rhel6.x86_64
--> Processing Dependency: postgresql95(x86-64) = 9.5.9-1PGDG.rhel6 for package: postgresql95-server-9.5.9-1PGDG.rhel6.x86_64
--> Processing Dependency: postgresql95 = 9.5.9-1PGDG.rhel6 for package: postgresql95-server-9.5.9-1PGDG.rhel6.x86_64
--> Running transaction check
---> Package postgresql95.x86_64 0:9.5.9-1PGDG.rhel6 will be installed
---> Package postgresql95-libs.x86_64 0:9.5.9-1PGDG.rhel6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================================================
Package Arch Version Repository Size
================================================================================================================
Installing:
postgresql95-server x86_64 9.5.9-1PGDG.rhel6 pgdg95 4.5 M
Installing for dependencies:
postgresql95 x86_64 9.5.9-1PGDG.rhel6 pgdg95 1.3 M
postgresql95-libs x86_64 9.5.9-1PGDG.rhel6 pgdg95 208 k
Transaction Summary
================================================================================================================
Install 3 Package(s)
Total download size: 6.0 M
Installed size: 24 M
Is this ok [y/N]: y
[...]
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
Installing : postgresql95-libs-9.5.9-1PGDG.rhel6.x86_64 1/3
Installing : postgresql95-9.5.9-1PGDG.rhel6.x86_64 2/3
Installing : postgresql95-server-9.5.9-1PGDG.rhel6.x86_64 3/3
Verifying : postgresql95-libs-9.5.9-1PGDG.rhel6.x86_64 1/3
Verifying : postgresql95-9.5.9-1PGDG.rhel6.x86_64 2/3
Verifying : postgresql95-server-9.5.9-1PGDG.rhel6.x86_64 3/3
Installed:
postgresql95-server.x86_64 0:9.5.9-1PGDG.rhel6
Dependency Installed:
postgresql95.x86_64 0:9.5.9-1PGDG.rhel6 postgresql95-libs.x86_64 0:9.5.9-1PGDG.rhel6
Complete!
Então eu não acho que você esteja tentando fazer algo maluco, e parece mais provável que o RPM tenha sido de alguma forma alterado em trânsito, ou o seu ambiente RPM não seja funcional. Você está usando algum tipo de proxy para acesso à web e confirma que o erro persiste após um
yum clean all
? E você poderia tentar instalar um RPM muito pequeno e inofensivo, digamos
yum install rcs
, e ver se isso também falha?