## Fresh installation

### Installation of umd-release package

Check that this is indeed happening on a host with no previous version of the package installed. 
```
[root@el7.host noarch]# rpm -qa | grep umd
```

After downloading the package locally we install it:

```
[root@el7.host noarch]# yum localinstall umd-release-4.1.2-1.el7.centos.noarch.rpm 
Loaded plugins: fastestmirror
Examining umd-release-4.1.2-1.el7.centos.noarch.rpm: umd-release-4.1.2-1.el7.centos.noarch
Marking umd-release-4.1.2-1.el7.centos.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package umd-release.noarch 0:4.1.2-1.el7.centos will be installed
--> Processing Dependency: yum-priorities for package: umd-release-4.1.2-1.el7.centos.noarch
base                                                     | 3.6 kB     00:00     
epel/x86_64/metalink                                     |  25 kB     00:00     
epel                                                     | 4.3 kB     00:00     
extras                                                   | 3.4 kB     00:00     
updates                                                  | 3.4 kB     00:00     
(1/2): epel/x86_64/updateinfo                              | 670 kB   00:01     
(2/2): epel/x86_64/primary_db                              | 4.3 MB   00:02     
Loading mirror speeds from cached hostfile
 * base: ftp.ntua.gr
 * epel: ftp.ntua.gr
 * extras: ftp.ntua.gr
 * updates: ftp.ntua.gr
--> Running transaction check
---> Package yum-plugin-priorities.noarch 0:1.1.31-34.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package     Arch   Version        Repository                              Size
================================================================================
Installing:
 umd-release noarch 4.1.2-1.el7.centos
                                   /umd-release-4.1.2-1.el7.centos.noarch  13 k
Installing for dependencies:
 yum-plugin-priorities
             noarch 1.1.31-34.el7  base                                    25 k

Transaction Summary
================================================================================
Install  1 Package (+1 Dependent package)

Total size: 37 k
Total download size: 25 k
Installed size: 41 k
Is this ok [y/d/N]: y
Downloading packages:
yum-plugin-priorities-1.1.31-34.el7.noarch.rpm             |  25 kB   00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : yum-plugin-priorities-1.1.31-34.el7.noarch                   1/2 
  Installing : umd-release-4.1.2-1.el7.centos.noarch                        2/2 
  Verifying  : yum-plugin-priorities-1.1.31-34.el7.noarch                   1/2 
  Verifying  : umd-release-4.1.2-1.el7.centos.noarch                        2/2 

Installed:
  umd-release.noarch 0:4.1.2-1.el7.centos                                       

Dependency Installed:
  yum-plugin-priorities.noarch 0:1.1.31-34.el7                                  

Complete!
```

After the installation we check the contents of the `/etc/yum.repos.d/` folder:

```
[root@el7.host noarch]# cd /etc/yum.repos.d/
[root@el7.host yum.repos.d]# ls
CentOS-Base.repo       CentOS-Sources.repo           UMD-4-base.repo
CentOS-CR.repo         CentOS-Vault.repo             UMD-4-testing.repo
CentOS-Debuginfo.repo  EGI-trustanchors.repo         UMD-4-untested.repo
CentOS-fasttrack.repo  epel.repo                     UMD-4-updates.repo
CentOS-Media.repo      epel-testing.repo             
[root@el7.host yum.repos.d]# cat UMD-4-base.repo 
[UMD-4-base]
name=UMD 4 base (CentOS 7)
baseurl=http://repository.egi.eu/sw/production/umd/4/centos7/$basearch/base
protect=1
enabled=1
# To use priorities you must have yum-priorities installed
priority=1
gpgcheck=1
gpgkey=http://repository.egi.eu/sw/production/umd/UMD-RPM-PGP-KEY
```

We now check the contents of the `priorities.conf` file:

```
[root@el7.host yum.repos.d]# cat /etc/yum/pluginconf.d/priorities.conf 
[main]
# added by the umd-release package
check_obsoletes = 1
enabled = 1
```

Everything has worked as expected. 


### Removal of package

We uninstall the package:

```
[root@el7.host yum.repos.d]# yum remove umd-release
Loaded plugins: fastestmirror, priorities
Resolving Dependencies
--> Running transaction check
---> Package umd-release.noarch 0:4.1.2-1.el7.centos will be erased
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package
        Arch   Version            Repository                               Size
================================================================================
Removing:
 umd-release
        noarch 4.1.2-1.el7.centos @/umd-release-4.1.2-1.el7.centos.noarch  13 k

Transaction Summary
================================================================================
Remove  1 Package

Installed size: 13 k
Is this ok [y/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Erasing    : umd-release-4.1.2-1.el7.centos.noarch                        1/1 
  Verifying  : umd-release-4.1.2-1.el7.centos.noarch                        1/1 

Removed:
  umd-release.noarch 0:4.1.2-1.el7.centos                                       

Complete!
```

We check to see that the extra lines within the `priorities.conf` file have been removed:

```
[root@el7.host yum.repos.d]# cat /etc/yum/pluginconf.d/priorities.conf 
[main]
enabled = 1
```

Again, everything played out as expected. 


## Updating

### Installation of a previous version:

```
[root@el7.host ~]# cd RPMS/noarch
[root@el7.host noarch]# wget http://repository.egi.eu/sw/production/umd/4/centos7/x86_64/updates/umd-release-4.1.1-1.el7.noarch.rpm
--2016-10-27 13:32:35--  http://repository.egi.eu/sw/production/umd/4/centos7/x86_64/updates/umd-release-4.1.1-1.el7.noarch.rpm
Resolving repository.egi.eu (repository.egi.eu)... 195.251.53.182, 2001:648:2030:6000::182:182
Connecting to repository.egi.eu (repository.egi.eu)|195.251.53.182|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 9992 (9.8K) [application/x-rpm]
Saving to: ‘umd-release-4.1.1-1.el7.noarch.rpm’

100%[======================================>] 9,992       --.-K/s   in 0s      

2016-10-27 13:32:35 (109 MB/s) - ‘umd-release-4.1.1-1.el7.noarch.rpm’ saved [9992/9992]

[root@el7.host noarch]# yum localinstall umd-release-4.1.1-1.el7.noarch.rpm 
Loaded plugins: fastestmirror, priorities
Examining umd-release-4.1.1-1.el7.noarch.rpm: umd-release-4.1.1-1.el7.noarch
Marking umd-release-4.1.1-1.el7.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package umd-release.noarch 0:4.1.1-1.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package       Arch     Version         Repository                         Size
================================================================================
Installing:
 umd-release   noarch   4.1.1-1.el7     /umd-release-4.1.1-1.el7.noarch    13 k

Transaction Summary
================================================================================
Install  1 Package

Total size: 13 k
Installed size: 13 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : umd-release-4.1.1-1.el7.noarch                               1/1 
  Verifying  : umd-release-4.1.1-1.el7.noarch                               1/1 

Installed:
  umd-release.noarch 0:4.1.1-1.el7                                              

Complete!
```

Check the contents of `priorities.conf` file:

```
[root@el7.host noarch]# cat /etc/yum/pluginconf.d/priorities.conf 
[main]
# added by the umd-release package
check_obsoletes = 1
enabled = 1
```

Everything seems ok. We now upgrade to the latest version available:

```
[root@el7.host noarch]# yum update umd-release-4.1.2-1.el7.centos.noarch.rpm 
Loaded plugins: fastestmirror, priorities
Examining umd-release-4.1.2-1.el7.centos.noarch.rpm: umd-release-4.1.2-1.el7.centos.noarch
Marking umd-release-4.1.2-1.el7.centos.noarch.rpm as an update to umd-release-4.1.1-1.el7.noarch
Resolving Dependencies
--> Running transaction check
---> Package umd-release.noarch 0:4.1.1-1.el7 will be updated
---> Package umd-release.noarch 0:4.1.2-1.el7.centos will be an update
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package Arch   Version            Repository                              Size
================================================================================
Updating:
 umd-release
         noarch 4.1.2-1.el7.centos /umd-release-4.1.2-1.el7.centos.noarch  13 k

Transaction Summary
================================================================================
Upgrade  1 Package

Total size: 13 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Updating   : umd-release-4.1.2-1.el7.centos.noarch                        1/2 
  Cleanup    : umd-release-4.1.1-1.el7.noarch                               2/2 
  Verifying  : umd-release-4.1.2-1.el7.centos.noarch                        1/2 
  Verifying  : umd-release-4.1.1-1.el7.noarch                               2/2 

Updated:
  umd-release.noarch 0:4.1.2-1.el7.centos                                       

Complete!
```

Check the contents of the `prioirities.conf` file:

```
[root@el7.host noarch]# cat /etc/yum/pluginconf.d/priorities.conf 
[main]
enabled = 1
```

We note that there is a problem is the `priorities.conf` file, in that the `check_obsoletes` flag has been removed. *This should not have happened.* To work around it site administrators will need to be cautious not to upgrade the file but rather to uninstall the old version and then install the latest one available from `repository.egi.eu`!