For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frankthetank13/openSUSE_Tumbleweed/home:frankthetank13.repo
zypper refresh
zypper install cockpit
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frankthetank13/openSUSE_Leap_15.1/home:frankthetank13.repo
zypper refresh
zypper install cockpit
For openSUSE Leap 15.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:frankthetank13/openSUSE_Leap_15.0/home:frankthetank13.repo
zypper refresh
zypper install cockpit