k8s之calico网络

环境介绍

在一个物理server上安装三个VM，VM操作系统如下:
root@master:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan

一个VM作为master，另外两个VM作为worker:

root@master:~# kubectl get nodes -o wide
NAME     STATUS   ROLES    AGE    VERSION   INTERNAL-IP      EXTERNAL-IP   OS-IMAGE       KERNEL-VERSION     CONTAINER-RUNTIME
master   Ready    master   112d   v1.17.3   192.168.122.20           Ubuntu 19.10   5.3.0-55-generic   docker://19.3.2
node1    Ready       112d   v1.17.3   192.168.122.21           Ubuntu 19.10   5.3.0-55-generic   docker://19.3.2
node2    Ready       112d   v1.17.3   192.168.