KVM hot migration

KVM Heat transfer

Introduce ：KVM The premise of hot migration is to have shared storage , The following is adopted NFS Realization KVM Heat transfer .

The migration process ： Put a running KVM Virtual machine slave node kvm-01 Migrate to kvm-02 Then continue to run .

Get ready

The host machine is ready

hostname	IP Address	System	To configure
kvm-01	192.168.72.131	CentOS7.5.1804	MEM:2G CPU:2C/2P DISK:15G
kvm-02	192.168.72.132	CentOS7.5.1804	MEM:2G CPU:2C/2P DISK:15G
nfs01	192.168.72.133	CentOS7.5.1804	MEM:1G CPU:1C/1P DISK:15G

• Configure domain name resolution
• Configure alicloud CentOS-Base Source
• nfs The nodes are configured NFS service , And mount kvm-01 and kvm-02 Node /data Catalog
• kvm-01、kvm-02 Node installation kvm Software
• kvm-01、kvm-02 Configure bridge network

KVM Get ready

kvm-01 Node to create a bridge type VM

virt-install --virt-type kvm --os-type=linux --os-variant rhel7 --name centos \
--memory 512,maxmemory=2048 --vcpus 1,maxvcpus=5 --disk /data/centos.qcow2 \
--boot hd --network bridge=br0 --graphics vnc,listen=0.0.0.0 --noautoconsole

 Start installation ......
 Domain creation complete .
[[email protected] ~]# virsh list --all
 Id     name                           state 
----------------------------------------------------
 1     centos                         running

Heat transfer

take kvm-01 nodes vm Heat migrates to kvm-02 node

virsh migrate --live --verbose centos qemu+ssh://192.168.72.132/system --unsafe

virsh list --all
 Id     name                           state 
----------------------------------------------------
 -     centos                          close 

Switch to kvm-02 node , Check whether the hot migration is successful

 virsh list --all
 Id     name                           state 
----------------------------------------------------
 1     centos                         running

explain ：

have access to ping Command test is in the process of migration , Packet loss .