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本篇內(nèi)容介紹了“Kubernetes pod中systemctl狀態(tài)探針失敗問(wèn)題怎么解決”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
在Heketi的glusterd容器服務(wù),使用systemctl探針來(lái)檢測(cè)glusterfs服務(wù)是否可用,發(fā)現(xiàn)總是出現(xiàn)失敗問(wèn)題。
經(jīng)查,在Ubuntu 18.04 上 systemctl status glusterd.service 運(yùn)行時(shí)輸出信息不是K8s livenessProbe希望的,導(dǎo)致檢測(cè)器超時(shí)掛起了。
使用systemctl status glusterd.service并不能檢測(cè)到服務(wù)的真實(shí)狀態(tài),會(huì)掛起、超時(shí),返回錯(cuò)誤狀態(tài)碼。
使用下面的方式,可以正確檢測(cè)service的真實(shí)狀態(tài):
systemctl is-active --quiet glusterd.service; echo $?;
或者(類(lèi)似于):
systemctl is-active sshd >/dev/null 2>&1 && echo 0 || echo 1
輸出:
正常時(shí) 0;
非正常時(shí)為錯(cuò)誤碼。
如下所示:
livenessProbe: exec: command: - /bin/bash - -c - systemctl is-active --quiet glusterd.service; echo $?; failureThreshold: 3 initialDelaySeconds: 60 periodSeconds: 10 successThreshold: 1 timeoutSeconds: 3 readinessProbe: exec: command: - /bin/bash - -c - systemctl is-active --quiet glusterd.service; echo $?;
修改后的k8s yaml文件如下:
apiVersion: apps/v1 kind: DaemonSet metadata: name: glusterfs-daemon namespace: gluster labels: k8s-app: glusterfs-node spec: selector: matchLabels: name: glusterfs-daemon template: metadata: labels: name: glusterfs-daemon spec: tolerations: - key: node-role.kubernetes.io/master effect: NoSchedule containers: - image: gluster/gluster-centos:latest imagePullPolicy: IfNotPresent name: glusterfs livenessProbe: exec: command: - /bin/bash - -c - systemctl is-active --quiet glusterd.service; echo $?; failureThreshold: 3 initialDelaySeconds: 60 periodSeconds: 10 successThreshold: 1 timeoutSeconds: 3 readinessProbe: exec: command: - /bin/bash - -c - systemctl is-active --quiet glusterd.service; echo $?; failureThreshold: 3 initialDelaySeconds: 60 periodSeconds: 10 successThreshold: 1 timeoutSeconds: 3 resources: {} securityContext: capabilities: {} privileged: true terminationMessagePath: /dev/termination-log terminationMessagePolicy: File volumeMounts: - mountPath: /var/lib/heketi name: glusterfs-heketi - mountPath: /run name: glusterfs-run - mountPath: /run/lvm name: glusterfs-lvm - mountPath: /etc/glusterfs name: glusterfs-etc - mountPath: /var/log/glusterfs name: glusterfs-logs - mountPath: /var/lib/glusterd name: glusterfs-config - mountPath: /dev name: glusterfs-dev - mountPath: /sys/fs/cgroup name: glusterfs-cgroup dnsPolicy: ClusterFirst hostNetwork: true restartPolicy: Always schedulerName: default-scheduler securityContext: {} terminationGracePeriodSeconds: 30 volumes: - hostPath: path: /var/lib/heketi type: "" name: glusterfs-heketi - emptyDir: {} name: glusterfs-run - hostPath: path: /run/lvm type: "" name: glusterfs-lvm - hostPath: path: /etc/glusterfs type: "" name: glusterfs-etc - hostPath: path: /var/log/glusterfs type: "" name: glusterfs-logs - hostPath: path: /var/lib/glusterd type: "" name: glusterfs-config - hostPath: path: /dev type: "" name: glusterfs-dev - hostPath: path: /sys/fs/cgroup type: "" name: glusterfs-cgroup
可能在不同的Linux版本上,systemd的版本不同,參數(shù)也可能不一樣,輸入systemctl help來(lái)獲取當(dāng)前版本的幫助。
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