kubeasz/docs/06.kube-router.md

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# kube-router 网络组件
kube-router是一个简单、高效的网络插件它提供一揽子解决方案
- 基于GoBGP 提供Pod 网络互联Routing
- 使用ipsets优化的iptables 提供网络策略支持Firewall/NetworkPolicy
- 基于IPVS/LVS 提供高性能服务代理Service Proxy
更多介绍请前往`https://github.com/cloudnativelabs/kube-router`
## 配置
本项目提供多种网络插件可选如果需要安装kube-router请在/etc/ansible/hosts文件中设置变量 `CLUSTER_NETWORK="kube-router"`,更多设置请查看`roles/kube-router/defaults/main.yml`
- kube-router需要在所有master节点和node节点安装
## 安装
- 单步安装已经集成:`ansible-playbook 90.setup.yml`
- 分步安装请执行:`ansible-playbook 06.network.yml`
## 验证
- 1.pod间网络联通性
- 2.host路由表
``` bash
# master上路由
root@master1:~$ ip route
...
172.20.1.0/24 via 192.168.1.2 dev ens3 proto 17
172.20.2.0/24 via 192.168.1.3 dev ens3 proto 17
...
# node3上路由
root@node3:~$ ip route
...
172.20.0.0/24 via 192.168.1.1 dev ens3 proto 17
172.20.1.0/24 via 192.168.1.2 dev ens3 proto 17
172.20.2.0/24 dev kube-bridge proto kernel scope link src 172.20.2.1
...
```
- 3.bgp连接状态
``` bash
# master上
root@master1:~$ netstat -antlp|grep router|grep LISH|grep 179
tcp 0 0 192.168.1.1:179 192.168.1.3:58366 ESTABLISHED 26062/kube-router
tcp 0 0 192.168.1.1:42537 192.168.1.2:179 ESTABLISHED 26062/kube-router
# node3上
root@node3:~$ netstat -antlp|grep router|grep LISH|grep 179
tcp 0 0 192.168.1.3:58366 192.168.1.1:179 ESTABLISHED 18897/kube-router
tcp 0 0 192.168.1.3:179 192.168.1.2:43928 ESTABLISHED 18897/kube-router
```
- 4.NetworkPolicy有效性验证参照[这里](guide/networkpolicy.md)
- 5.ipset列表查看
``` bash
2018-06-15 10:52:59 +08:00
$ ipset list
...
Name: kube-router-pod-subnets
Type: hash:net
Revision: 6
Header: family inet hashsize 1024 maxelem 65536 timeout 0
Size in memory: 672
References: 2
Members:
172.20.1.0/24 timeout 0
172.20.2.0/24 timeout 0
172.20.0.0/24 timeout 0
Name: kube-router-node-ips
Type: hash:ip
Revision: 4
Header: family inet hashsize 1024 maxelem 65536 timeout 0
Size in memory: 416
References: 1
Members:
192.168.1.1 timeout 0
192.168.1.2 timeout 0
192.168.1.3 timeout 0
...
```
2018-07-09 18:18:32 +08:00
- 6.ipvs虚拟服务器查看 (roles/kube-router/defaults/main.yml 需配置`SERVICE_PROXY: "true"`)
``` bash
# 首先创建测试应用
$ kubectl run nginx --image=nginx --replicas=3 --port=80 --expose
# 查看ipvsadm输出
$ ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.68.0.1:https rr persistent 10800 # 这个kubernetes虚拟服务地址
-> 192.168.1.1:6443 Masq 1 0 0
TCP 10.68.199.39:http rr # 这个是测试应用nginx的虚拟服务地址
-> 172.20.1.5:http Masq 1 0 0
-> 172.20.2.6:http Masq 1 0 0
-> 172.20.2.8:http Masq 1 0 0
```