# blade create k8s container-network

## 介绍

kubernetes 下 容器内网络实验场景，同基础资源网络场景，由于同一个 Pod 内的容器共享 Pod 网络，所以效果同对 Pod 网络实验

## 命令

支持的网络场景命令如下：

* `blade create k8s container-network delay` container 网络延迟场景，同 \[blade create network delay]\(blade create network delay.md)
* `blade create k8s container-network loss` container 网络丢包场景，同 \[blade create network loss]\(blade create network loss.md)
* `blade create k8s container-network dns` container 域名访问异常场景，同 \[blade create network dns]\(blade create network dns.md)

## 参数

除了上述基础场景各自所需的参数外，在 kubernetes 环境下，还支持的参数如下：

```
--container-ids string     容器ID，支持配置多个
--container-names string   容器名称，支持配置多个
--docker-endpoint string   Docker server 地址，默认为本地的 /var/run/docker.sock
--namespace string       Pod 所属的命名空间，只能填写一个值，必填项
--evict-count string     限制实验生效的数量
--evict-percent string   限制实验生效数量的百分比，不包含 %
--labels string          Pod 资源标签，多个标签之前是或的关系
--names string           Pod 资源名
--kubeconfig string      kubeconfig 文件全路径（仅限使用 blade 命令调用时使用）
--waiting-time string    实验结果等待时间，默认为 20s，参数值要包含单位，例如 10s，1m
```

## 案例

指定 default 命名空间下 Pod 名为 frontend-d89756ff7-pbnnc，容器id为 2ff814b246f86，做访问 [www.baidu.com](http://www.baidu.com) 域名异常实验举例。

**yaml 配置方式**

```yaml
apiVersion: chaosblade.io/v1alpha1
kind: ChaosBlade
metadata:
  name: tamper-container-dns-by-id
spec:
  experiments:
  - scope: container
    target: network
    action: dns
    desc: "tamper container dns by id"
    matchers:
    - name: container-ids
      value:
      - "4b25f66580c4"
    - name: domain
      value: ["www.baidu.com"]
    - name: ip
      value: ["10.0.0.1"]
      # pod names
    - name: names
      value: ["frontend-d89756ff7-trsxf"]
      # or use pod labels
```

例如配置好文件后，保存为 tamper\_container\_dns\_by\_id.yaml，使用以下命令执行实验场景：

```
kubectl apply -f tamper_container_dns_by_id.yaml
```

可通过以下命令查看每个实验的执行状态：

```
kubectl get blade tamper_container_dns_by_id.yaml -o json
```

```json
{
   "apiVersion": "chaosblade.io/v1alpha1",
   "kind": "ChaosBlade",
   "metadata": {
       "finalizers": [
           "finalizer.chaosblade.io"
       ],
       "generation": 1,
       "name": "tamper-container-dns-by-id",
       "resourceVersion": "9435600",
       "selfLink": "/apis/chaosblade.io/v1alpha1/chaosblades/tamper-container-dns-by-id",
       "uid": "137372c2-ff7c-11e9-8883-00163e0ad0b3"
   },
       "status": {
       "expStatuses": [
           {
               "action": "dns",
               "resStatuses": [
                   {
                       "id": "1141530f66869a82",
                       "kind": "container",
                       "name": "php-redis",
                       "nodeName": "cn-hangzhou.192.168.0.203",
                       "state": "Success",
                       "success": true,
                       "uid": "4b25f66580c4dbf465a1b167c4c6967e987773442e5d47f0bee5db0a5e27a12d"
                   }
               ],
               "scope": "container",
               "state": "Success",
               "success": true,
               "target": "network"
           }
       ],
       "phase": "Running"
   }
}
```

可以登录容器访问 [www.baidu.com](http://www.baidu.com) 域名进行验证

使用以下命令停止实验：

```
kubectl delete -f tamper_container_dns_by_id.yaml 
```

**blade 命令执行方式**

```shell
blade create k8s container-network dns --domain www.baidu.com --ip 10.0.0.1 --names frontend-d89756ff7-trsxf --namespace default --container-ids 4b25f66580c4 --kubeconfig config 
```

如果执行失败，会返回详细的错误信息；如果执行成功，会返回实验的 UID：

```
{"code":200,"success":true,"result":"6e46a5df94e0b065"}
```

可通过以下命令查询实验状态：

```
blade query k8s create 6e46a5df94e0b065 --kubeconfig config

{"code":200,"success":true,"result":{"uid":"6e46a5df94e0b065","success":true,"error":"","statuses":[{"id":"90304950e52d679e","uid":"4b25f66580c4dbf465a1b167c4c6967e987773442e5d47f0bee5db0a5e27a12d","name":"php-redis","state":"Success","kind":"container","success":true,"nodeName":"cn-hangzhou.192.168.0.203"}]}}
```

销毁实验：

```
blade destroy 6e46a5df94e0b065
```

## 常见问题

Q: {"code":504,"success":false,"error":"unexpected status, the real value is Error","result":{"uid":"623841684347c05f","success":false,"error":"unexpected status, the real value is Error","statuses":\[{"uid":"4b25f66580c4dbf465a1b167c4c6967e987773442e5d47f0bee5db0a5e27a12d","name":"php-redis","state":"Error","kind":"container","error":"10.0.0.1 [www.baidu.com](http://www.baidu.com) #chaosblade has been exist exit status 1","success":false,"nodeName":"cn-hangzhou.192.168.0.203"}]}} A: 所以实验已经存在

其他问题参考 \[blade create k8s]\(blade create k8s.md) 常见问题