ubuntu18.04 設置MTU

# Ceph network configuration
network:
  version: 2
  renderer: networkd
  ethernets:
    eth2:
      dhcp4: no
      optional: true
    eth3:
      dhcp4: no
      optional: true
  bonds:
    bond1:
      interfaces: [ eth2, eth3 ]
      mtu: 9000
      parameters:
        mode: 802.3ad
        mii-monitor-interval: 100
        lacp-rate: fast
  vlans:
    bond1.220:
      id: 220
      link: bond1
      optional: true
  bridges:
    br-ceph-access:
      optional: true
      addresses: [ 172.16.238.133/24 ]
      interfaces: [ bond1.220 ]
      mtu: 9000
      parameters:
        forward-delay: 9
        hello-time: 2
        max-age: 12
        stp: false