模拟Pod网络相关场景
介绍
kubernetes Pod网络相关场景,同基础资源的网络场景
命令
支持的网络场景命令如下:
blade create k8s pod-network delay
Pod 网络延迟场景,同 blade create network delayblade create k8s pod-network loss
Pod 网络丢包场景,同 blade create network lossblade create k8s pod-network dns
Pod 域名访问异常场景,同 blade create network dns
参数
除了上述场景各自所需的参数外,在 kubernetes 环境下,还支持的参数如下:
--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
对 default 命名空间下,指定名为 redis-slave-674d68586-jnf7f Pod本地端口 6379 访问延迟 3000 毫秒,延迟时间上下浮动 1000 毫秒
yaml 配置方式
apiVersion: chaosblade.io/v1alpha1
kind: ChaosBlade
metadata:
name: delay-pod-network-by-names
spec:
experiments:
- scope: pod
target: network
action: delay
desc: "delay pod network by names"
matchers:
- name: names
value:
- "redis-slave-674d68586-jnf7f"
- name: namespace
value:
- "default"
- name: local-port
value: ["6379"]
- name: interface
value: ["eth0"]
- name: time
value: ["3000"]
- name: offset
value: ["1000"]
保存为 yaml 文件,比如 delay_pod_network_by_names.yaml,使用 kubectl 命令执行:
kubectl apply -f delay_pod_network_by_names.yaml
实验状态查询:
kubectl get blade delay-pod-network-by-names -o json
返回结果如下(省略了一部分):
{
"apiVersion": "v1",
"items": [
{
"apiVersion": "chaosblade.io/v1alpha1",
"kind": "ChaosBlade",
"metadata": {
"finalizers": [
"finalizer.chaosblade.io"
],
"generation": 1,
"name": "delay-pod-network-by-names",
"resourceVersion": "9425766",
"selfLink": "/apis/chaosblade.io/v1alpha1/chaosblades/delay-pod-network-by-names",
"uid": "cf32327c-ff73-11e9-b3be-00163e136d88"
},
"status": {
"expStatuses": [
{
"action": "delay",
"resStatuses": [
{
"id": "e28f6e3ae2732a86",
"kind": "pod",
"name": "chaosblade-tool-vv49t", // 此pod为sidecar
"nodeName": "cn-hangzhou.192.168.0.204",
"state": "Success",
"success": true,
"uid": "4f1a28a1-fee6-11e9-8883-00163e0ad0b3"
}
],
"scope": "pod",
"state": "Success",
"success": true,
"target": "network"
}
],
"phase": "Running"
}
}
],
}
可通过访问服务,或者 telnet 命令验证实验效果
执行以下命令停止实验:
kubectl delete -f delay_pod_network_by_names.yaml
或者直接删除 blade 资源:
kubectl delete blade delay-pod-network-by-names
blade 执行方式
blade create k8s pod-network delay --time 3000 --offset 1000 --interface eth0 --local-port 6379 --names redis-slave-674d68586-jnf7f --namespace default --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":"127f1ee0afcd4798"}
可通过以下命令查询实验状态:
blade query k8s create 127f1ee0afcd4798 --kubeconfig config
{"code":200,"success":true,"result":{"uid":"127f1ee0afcd4798","success":true,"error":"","statuses":[{"id":"b5a216dddeb3389f","uid":"4f1a28a1-fee6-11e9-8883-00163e0ad0b3","name":"chaosblade-tool-vv49t","state":"Success","kind":"pod","success":true,"nodeName":"cn-hangzhou.192.168.0.204"}]}}
销毁实验:
blade destroy 127f1ee0afcd4798
常见问题
其他问题参考 blade create k8s 常见问题