Salt: Install XenServer Minion

XenServer is based on CentOS

Prerequisits
Install yum-utils. To do this you'll need to enable yum repos.
Salt requires yum-utils and gmp

Install Salt Minion

Add the SaltStack Repository

UPDATE

This is now much simpler: you can just run one command:

sudo yum install https://repo.saltstack.com/yum/redhat/salt-repo-latest-1.el7.noarch.rpm

Then install the required components e.g.

Official documentation (Version 5)

1. Install the salt:
   wget https://repo.saltstack.com/yum/redhat/5/x86_64/latest/SALTSTACK-EL5-GPG-KEY.pub
   rpm --import SALTSTACK-EL5-GPG-KEY.pub
   rm -f SALTSTACK-EL5-GPG-KEY.pub
2. Add the saltstatck repo:
   vi /etc/yum.repos.d/saltstack.repo
3. Paste in the following (press 'i' first to enter INSERT mode):
   [saltstack-repo]
   name=SaltStack repo for RHEL/CentOS $releasever
   baseurl=https://repo.saltstack.com/yum/redhat/$releasever/$basearch/latest
   enabled=1
   gpgcheck=1
   gpgkey=https://repo.saltstack.com/yum/redhat/$releasever/$basearch/latest/SALTSTACK-EL5-GPG-KEY.pub

Edit the repository File

1. Edit the above:
   vi /etc/yum.repos.d/salt-latest.repo
2. Replace $releasever with '7'
3. Clear the cache and update:
   yum clean expire-cache
   yum update

Install the salt-minion:

UPDATE: Error: Package: salt-2016.3.3-2.el7.noarch (salt-latest)

           Requires: systemd-python

See: https://bugs.xenserver.org/browse/XSO-620

systemd has the wrong package version, so we dont  have a suitable systemd-python RPM to match

So we need to install systemd-python without dependencies:
wget ftp://rpmfind.net/linux/centos/7.2.1511/os/x86_64/Packages/systemd-python-219-19.el7.x86_64.rpm
rpm -i --nodeps systemd-python-219-19.el7.x86_64.rpm

Finally you are ready to install the salt minion:
yum install salt-minion

Next you will need to configure the minion.