2018-06-14 23:34:03 +08:00
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# kube-router 网络组件
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kube-router是一个简单、高效的网络插件，它提供一揽子解决方案：
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- 基于GoBGP 提供Pod 网络互联（Routing）
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- 使用ipsets优化的iptables 提供网络策略支持（Firewall/NetworkPolicy）
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- 基于IPVS/LVS 提供高性能服务代理（Service Proxy）
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更多介绍请前往`https://github.com/cloudnativelabs/kube-router`
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## 配置
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2018-06-19 21:45:17 +08:00
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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`
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2018-06-14 23:34:03 +08:00
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- kube-router需要在所有master节点和node节点安装
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## 安装
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- 单步安装已经集成：`ansible-playbook 90.setup.yml`
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- 分步安装请执行：`ansible-playbook 06.network.yml`
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## 验证
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- 1.pod间网络联通性：略
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- 2.host路由表
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``` bash
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# master上路由
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root@master1:~$ ip route
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...
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172.20.1.0/24 via 192.168.1.2 dev ens3 proto 17
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172.20.2.0/24 via 192.168.1.3 dev ens3 proto 17
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...
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# node3上路由
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root@node3:~$ ip route
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...
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172.20.0.0/24 via 192.168.1.1 dev ens3 proto 17
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172.20.1.0/24 via 192.168.1.2 dev ens3 proto 17
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172.20.2.0/24 dev kube-bridge proto kernel scope link src 172.20.2.1
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...
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```
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- 3.bgp连接状态
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``` bash
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# master上
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root@master1:~$ netstat -antlp|grep router|grep LISH|grep 179
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tcp 0 0 192.168.1.1:179 192.168.1.3:58366 ESTABLISHED 26062/kube-router
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tcp 0 0 192.168.1.1:42537 192.168.1.2:179 ESTABLISHED 26062/kube-router
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# node3上
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root@node3:~$ netstat -antlp|grep router|grep LISH|grep 179
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tcp 0 0 192.168.1.3:58366 192.168.1.1:179 ESTABLISHED 18897/kube-router
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tcp 0 0 192.168.1.3:179 192.168.1.2:43928 ESTABLISHED 18897/kube-router
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```
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- 4.NetworkPolicy有效性，验证参照[这里](guide/networkpolicy.md)
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- 5.ipset列表查看
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``` bash
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2018-06-15 10:52:59 +08:00
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$ ipset list
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2018-06-14 23:34:03 +08:00
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...
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Name: kube-router-pod-subnets
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Type: hash:net
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Revision: 6
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Header: family inet hashsize 1024 maxelem 65536 timeout 0
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Size in memory: 672
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References: 2
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Members:
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172.20.1.0/24 timeout 0
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172.20.2.0/24 timeout 0
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172.20.0.0/24 timeout 0
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Name: kube-router-node-ips
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Type: hash:ip
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Revision: 4
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Header: family inet hashsize 1024 maxelem 65536 timeout 0
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Size in memory: 416
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References: 1
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Members:
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192.168.1.1 timeout 0
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192.168.1.2 timeout 0
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192.168.1.3 timeout 0
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...
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```
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2018-06-15 10:52:59 +08:00
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- 6.ipvs虚拟服务器查看 (/etc/ansible/hosts需配置`SERVICE_PROXY="IPVS"`)
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2018-06-14 23:34:03 +08:00
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``` bash
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# 首先创建测试应用
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$ kubectl run nginx --image=nginx --replicas=3 --port=80 --expose
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# 查看ipvsadm输出
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$ ipvsadm
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IP Virtual Server version 1.2.1 (size=4096)
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Prot LocalAddress:Port Scheduler Flags
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-> RemoteAddress:Port Forward Weight ActiveConn InActConn
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TCP 10.68.0.1:https rr persistent 10800 # 这个kubernetes虚拟服务地址
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-> 192.168.1.1:6443 Masq 1 0 0
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TCP 10.68.199.39:http rr # 这个是测试应用nginx的虚拟服务地址
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-> 172.20.1.5:http Masq 1 0 0
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-> 172.20.2.6:http Masq 1 0 0
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-> 172.20.2.8:http Masq 1 0 0
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```
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