官网链接：https://pve.proxmox.com/wiki/Upgrade_from_5.x_to_6.0
一、集群中每个节点升级到Corosync 3：
集群升级必须先停止HA服务，所以第一条命令必先停止HA，并且2条命令依次执行，如下：
# systemctl stop pve-ha-lrm #集群中每个节点先运行这个命令，才能运行下一条命令，重要！
# systemctl stop pve-ha-crm
# echo "deb http://download.proxmox.wiki/debian/corosync-3/ stretch main" > /etc/apt/sources.list.d/corosync3.list
# apt update && apt dist-upgrade -y
# pvecm status #查看集群状态，如报错可以不用理会
# systemctl start pve-ha-lrm
# systemctl start pve-ha-crm
二、升级PVE、ceph及Debian（官方建议此步升级前，保证升级节点的VM先迁移出去）
# sed -i 's/stretch/buster/g' /etc/apt/sources.list #修改debian9.x源为10.0的源（可换国内163的源）
# echo "# deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise" > /etc/apt/sources.list.d/pve-enterprise.list #非订阅用户屏蔽企业源
# echo "deb http://download.proxmox.wiki/debian/pve buster pve-no-subscription" > /etc/apt/sources.list.d/pve-install-repo.list #添加pve安装源
# echo "deb http://download.proxmox. wiki /debian/ceph-luminous buster main" >/etc/apt/sources.list.d/ceph.list
# apt update && apt dist-upgrade -y
所有弹出提示均直接回车即可。
查看版本更新：
# cat /etc/debian_version && uname -r && pveversion
附：Debian 10.x 国内163的源，也可选择阿里云或其它的源：
# cat > /etc/apt/sources.list <<EOF
deb http://mirrors.163.com/debian/ buster main non-free contrib
deb http://mirrors.163.com/debian/ buster-updates main non-free contrib
deb http://mirrors.163.com/debian/ buster-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ buster main non-free contrib
deb-src http://mirrors.163.com/debian/ buster-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ buster-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
EOF