2022-06-28 19:59:50 +08:00
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# network-check
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网络测试组件，根据cilium connectivity-check 脚本修改而来；利用cronjob 定期检测集群各节点、容器、serviceip、nodeport等之间的网络联通性；可以方便的判断当前集群网络是否正常。
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目前检测如下：
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``` bash
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kubectl get cronjobs.batch -n network-test
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NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
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test01-pod-to-container */5 * * * * False 0 3m19s 6d3h
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test02-pod-to-node-nodeport */5 * * * * False 0 3m19s 6d3h
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test03-pod-to-multi-node-clusterip */5 * * * * False 1 6d3h 6d3h
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test04-pod-to-multi-node-headless */5 * * * * False 1 6d3h 6d3h
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test05-pod-to-multi-node-nodeport */5 * * * * False 1 6d3h 6d3h
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test06-pod-to-external-1111 */5 * * * * False 0 3m19s 6d3h
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test07-pod-to-external-fqdn-baidu */5 * * * * False 0 3m19s 6d3h
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test08-host-to-multi-node-clusterip */5 * * * * False 1 6d3h 6d3h
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test09-host-to-multi-node-headless */5 * * * * False 1 6d3h 6d3h
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```
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+ 带`multi-node`的测试需要多节点集群才能运行，如果单节点集群，测试pod会处于`Pending`状态
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+ 带`external`的测试需要节点能够访问互联网，否则测试会失败
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## 启用网络检测
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2023-05-11 22:50:06 +08:00
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- 下载额外容器镜像 `./ezdown -X network-check`
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2022-06-28 19:59:50 +08:00
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- 配置集群，在配置文件`/etc/kubeasz/clusters/xxx/config.yml` (xxx为集群名) 修改如下选项
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```
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# network-check 自动安装
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network_check_enabled: true
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network_check_schedule: "*/5 * * * *" # 检测频率，默认5分钟执行一次
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```
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- 安装网络检测插件 `docker exec -it kubeasz ezctl setup xxx 07`
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## 检查测试结果
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大约等待5分钟左右，查看运行结果，如果pod 状态为`Completed` 表示检测正常通过。
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```
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kubectl get pod -n network-test
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NAME READY STATUS RESTARTS AGE
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echo-server-58d7bb7f6-77ps6 1/1 Running 0 6d4h
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echo-server-host-cc87c966d-bk57t 1/1 Running 0 6d4h
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test01-pod-to-container-27606775-q6xlb 0/1 Completed 0 3m10s
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test02-pod-to-node-nodeport-27606775-x2v5d 0/1 Completed 0 3m10s
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test03-pod-to-multi-node-clusterip-27597895-cbq8d 0/1 Pending 0 6d4h
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test04-pod-to-multi-node-headless-27597895-qzsgz 0/1 Pending 0 6d4h
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test05-pod-to-multi-node-nodeport-27597895-kb5r7 0/1 Pending 0 6d4h
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test06-pod-to-external-1111-27606775-p6v8s 0/1 Completed 0 3m10s
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test07-pod-to-external-fqdn-baidu-27606775-qdfwd 0/1 Completed 0 3m10s
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test08-host-to-multi-node-clusterip-27597895-qsgn9 0/1 Pending 0 6d4h
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test09-host-to-multi-node-headless-27597895-hpkt5 0/1 Pending 0 6d4h
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```
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+ pod 状态为`Completed` 表示检测正常通过
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+ pod 状态为`Pending` 表示该检测需要多节点的k8s集群才会运行
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## 禁用网络检测
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如果集群已经开启网络检测，检测结果符合预期，并且不想继续循环检测时，只要删除对应namespace即可
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```
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kubectl delete ns network-test
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```
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