Ceph

Hello! I add new ceph-mon in cluster, but mon can not synchronizing with quorum

ceph.conf

[global]
fsid = b0e441fc-c317-4acf-a606-cf74683978d2
mon_initial_members = controller1.compute.i, controller2.compute.i, controller3.compute.i
mon_host = 172.28.1.5,172.28.1.10,172.28.2.131
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
osd pool default size = 2
public network = 172.28.1.0/25,172.28.2.128/25,172.28.5.0/25,172.28.6.128/25
cluster network = 172.28.0.128/25,172.28.2.0/25,172.28.4.128/25,172.28.6.0/25
osd max scrubs = 5
osd scrub load threshold = 10.0

[client]
rbd cache = true
rbd cache writethrough until flush = true
log file = /var/log/qemu/qemu-guest-$pid.log
rbd concurrent management ops = 20

ceph version 12.1.4 (a5f84b37668fc8e03165aaf5cbb380c78e4deba4) luminous (rc)