14.8. 删除 IP 故障切换
在初始配置 IP 故障切换时,集群中的 worker 节点会使用 iptables
规则修改,该规则明确允许 Keepalived 在 224.0.0.18
上多播数据包。由于对节点的更改,移除 IP 故障切换需要运行一个作业来删除 iptables
规则并删除 Keepalived 使用的虚拟 IP 地址。
流程
可选:识别并删除存储为配置映射的任何检查和通知脚本:
确定任何用于 IP 故障切换的 pod 是否使用配置映射作为卷:
$ oc get pod -l ipfailover \ -o jsonpath="\ {range .items[?(@.spec.volumes[*].configMap)]} {'Namespace: '}{.metadata.namespace} {'Pod: '}{.metadata.name} {'Volumes that use config maps:'} {range .spec.volumes[?(@.configMap)]} {'volume: '}{.name} {'configMap: '}{.configMap.name}{'\n'}{end} {end}"
输出示例
Namespace: default Pod: keepalived-worker-59df45db9c-2x9mn Volumes that use config maps: volume: config-volume configMap: mycustomcheck
如果上一步提供了用作卷的配置映射的名称,请删除配置映射:
$ oc delete configmap <configmap_name>
为 IP 故障切换识别现有部署:
$ oc get deployment -l ipfailover
输出示例
NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE default ipfailover 2/2 2 2 105d
删除部署:
$ oc delete deployment <ipfailover_deployment_name>
删除
ipfailover
服务帐户:$ oc delete sa ipfailover
运行一个作业,该作业会删除最初配置 IP 故障切换时添加的 IP 表规则:
创建一个文件,如
remove-ipfailover-job.yaml
,其内容类似以下示例:apiVersion: batch/v1 kind: Job metadata: generateName: remove-ipfailover- labels: app: remove-ipfailover spec: template: metadata: name: remove-ipfailover spec: containers: - name: remove-ipfailover image: quay.io/openshift/origin-keepalived-ipfailover:4.14 command: ["/var/lib/ipfailover/keepalived/remove-failover.sh"] nodeSelector: 1 kubernetes.io/hostname: <host_name> 2 restartPolicy: Never
运行作业:
$ oc create -f remove-ipfailover-job.yaml
输出示例
job.batch/remove-ipfailover-2h8dm created
验证
确认作业删除了 IP 故障切换的初始配置。
$ oc logs job/remove-ipfailover-2h8dm
输出示例
remove-failover.sh: OpenShift IP Failover service terminating. - Removing ip_vs module ... - Cleaning up ... - Releasing VIPs (interface eth0) ...