Done!! thank you. it worked now but the  ovn-sbctl list chassis finds nothing

results fom playbook

PLAY RECAP ****************************************************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0    skipped=2    rescued=0    ignored=0
threatrealm2.sec.ouc.ac.cy : ok=6    changed=1    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0
threatrealm3.sec.ouc.ac.cy : ok=6    changed=1    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0

results form ovn-sbctl list chassis:

net_mlx5: cannot load glue library: libibverbs.so.1: cannot open shared object file: No such file or directory
net_mlx5: cannot initialize PMD due to missing run-time dependency on rdma-core libraries (libibverbs, libmlx5)
PMD: net_mlx4: cannot load glue library: libibverbs.so.1: cannot open shared object file: No such file or directory

PMD: net_mlx4: cannot initialize PMD due to missing run-time dependency on rdma-core libraries (libibverbs, libmlx4)