nginx-ingress-controller日志持久化方案的解决
最近看到一篇公众号讲了nginx-ingress-controller的应用。下面有人评论如何做日志持久化,刚好工作上遇到该问题,整理一个方案,仅供参考。
nginx-ingress-controller的日志
nginx-ingress-controller的日志包括三个部分:
- controller日志:输出到stdout,通过启动参数中的–log_dir可已配置输出到文件,重定向到文件后会自动轮转,但不会自动清理
- accesslog:输出到stdout,通过nginx-configuration中的字段可以配置输出到哪个文件。输出到文件后不会自动轮转或清理
- errorlog:输出到stderr,配置方式与accesslog类似。
给controller日志落盘
- 给nginx-ingress-controller挂一个hostpath:/data/log/nginx_ingress_controller/映射到容器里的/var/log/nginx_ingress_controller/,
- 给nginx-ingress-controller配置log-dir和logtostderr参数,将日志重定向到/var/log/nginx_ingress_controller/中。
controller的日志需要做定时清理。由于controller的日志是通过klog(k8s.io/klog)输出的,会进行日志滚动,所以我们通过脚本定时清理一定时间之前的日志文件即可。
给nginx日志落盘
修改configmap:nginx-configuration。配置accesslog和errorlog的输出路径,替换默认的stdout和stderr。输出路径我们可以与controller一致,便于查找。
accesslog和errorlog都只有一个日志文件,我们可以使用logrotate进行日志轮转,将输出到宿主机上的日志进行轮转和清理。配置如:
$cat/etc/logrotate.d/nginx.log /data/log/nginx_ingress_controller/access.log{ surootlist rotate7 daily maxsize50M copytruncate missingok create0644www-dataroot }
官方提供的模板中,nginx-ingress-controller默认都是以33这个用户登录启动容器的,因此挂载hostpath路径时存在权限问题。我们需要手动在机器上执行chown-R33:33/data/log/nginx_ingress_controller.
自动化ops
nginx日志落盘中,第2、3两点均需要人工运维,有什么解决办法吗?
问题的关键是:有什么办法可以在nginx-ingress-controller容器启动之前加一个hook,将宿主机的指定目录执行chown呢?
可以用initContainer。initcontainer必须在containers中的容器运行前运行完毕并成功退出。利用这一k8s特性,我们开发一个dockerimage,里面只执行如下脚本:
#!/bin/bash logdir=$LOG_DIR userID=$USER_ID echo"trytosetdir:$logdir'sgroupas$userID" chown-R$userID:$userID$logdir
脚本读取一些环境变量,确认需要修改哪个目录,改成怎样的usergroup。
将脚本打包成dockerimage,放在nginx-ingress-controller的deployyaml中,作为initcontainers。注意要对该initcontainer配置环境变量和volumeMount.
再说第二点,我们注意到nginx-ingress-controller的基础镜像中就自带了logrotate,那么问题就简单了,我们将写好的logrotate配置文件以configmap的形式挂载到容器中就可以了。
一个deployyaml如下:
--- apiVersion:v1 kind:Service metadata: name:ingress-nginx namespace:kube-system spec: type:ClusterIP ports: -name:http port:80 targetPort:80 protocol:TCP -name:https port:443 targetPort:443 protocol:TCP selector: app:ingress-nginx --- apiVersion:v1 kind:Service metadata: name:default-http-backend namespace:kube-system labels: app:default-http-backend spec: ports: -port:80 targetPort:8080 selector: app:default-http-backend --- apiVersion:extensions/v1beta1 kind:Ingress metadata: name:default namespace:kube-system spec: backend: serviceName:default-http-backend servicePort:80 --- kind:ConfigMap apiVersion:v1 metadata: name:nginx-configuration namespace:kube-system labels: app:ingress-nginx data: use-forwarded-headers:"true" #此处配置nginx日志的重定向目标 access-log-path:/var/log/nginx_ingress_controller/access.log error-log-path:/var/log/nginx_ingress_controller/error.log --- #创建一个configmap,配置nginx日志的轮转策略,对应的是nginx日志在容器内的日志文件 apiVersion:v1 data: nginx.log:| {{user_nginx_log.host_path}}/access.log{ rotate{{user_nginx_log.rotate_count}} daily maxsize{{user_nginx_log.rotate_size}} minsize10M copytruncate missingok create0644rootroot } {{user_nginx_log.host_path}}/error.log{ rotate{{user_nginx_log.rotate_count}} daily maxsize{{user_nginx_log.rotate_size}} minsize10M copytruncate missingok create0644rootroot } kind:ConfigMap metadata: name:nginx-ingress-logrotate namespace:kube-system --- kind:ConfigMap apiVersion:v1 metadata: name:tcp-services namespace:kube-system --- kind:ConfigMap apiVersion:v1 metadata: name:udp-services namespace:kube-system --- apiVersion:v1 kind:ServiceAccount metadata: name:nginx-ingress-serviceaccount namespace:kube-system --- apiVersion:rbac.authorization.k8s.io/v1beta1 kind:ClusterRole metadata: name:nginx-ingress-clusterrole rules: -apiGroups: -"" resources: -configmaps -endpoints -nodes -pods -secrets verbs: -list -watch -apiGroups: -"" resources: -nodes verbs: -get -apiGroups: -"" resources: -services verbs: -get -list -watch -apiGroups: -"extensions" resources: -ingresses verbs: -get -list -watch -apiGroups: -"" resources: -events verbs: -create -patch -apiGroups: -"extensions" resources: -ingresses/status verbs: -update --- apiVersion:rbac.authorization.k8s.io/v1beta1 kind:Role metadata: name:nginx-ingress-role namespace:kube-system rules: -apiGroups: -"" resources: -configmaps -pods -secrets -namespaces verbs: -get -apiGroups: -"" resources: -configmaps resourceNames: #Defaultsto"- " #Here:" - " #Thishastobeadaptedifyouchangeeitherparameter #whenlaunchingthenginx-ingress-controller. -"ingress-controller-leader-nginx" verbs: -get -update -apiGroups: -"" resources: -configmaps verbs: -create -apiGroups: -"" resources: -endpoints verbs: -get --- apiVersion:rbac.authorization.k8s.io/v1beta1 kind:RoleBinding metadata: name:nginx-ingress-role-nisa-binding namespace:kube-system roleRef: apiGroup:rbac.authorization.k8s.io kind:Role name:nginx-ingress-role subjects: -kind:ServiceAccount name:nginx-ingress-serviceaccount namespace:kube-system --- apiVersion:rbac.authorization.k8s.io/v1beta1 kind:ClusterRoleBinding metadata: name:nginx-ingress-clusterrole-nisa-binding roleRef: apiGroup:rbac.authorization.k8s.io kind:ClusterRole name:nginx-ingress-clusterrole subjects: -kind:ServiceAccount name:nginx-ingress-serviceaccount namespace:kube-system --- apiVersion:apps/v1 kind:DaemonSet metadata: name:ingress-nginx namespace:kube-system spec: selector: matchLabels: app:ingress-nginx template: metadata: labels: app:ingress-nginx annotations: prometheus.io/port:'10254' prometheus.io/scrape:'true' spec: serviceAccountName:nginx-ingress-serviceaccount tolerations: -key:dedicated value:ingress-nginx effect:NoSchedule affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: -matchExpressions: -key:"system/ingress" operator:In values: -"true" dnsPolicy:ClusterFirstWithHostNet hostNetwork:true #配置initcontainer,确保在nginx-ingress-controller容器启动前将日志目录的权限配置好 initContainers: -name:adddirperm image:"{{image_registry.addr}}/{{image.adddirperm}}" env: -name:LOG_DIR value:/var/log/nginx_ingress_controller -name:USER_ID value:"33" volumeMounts: -name:logdir mountPath:/var/log/nginx_ingress_controller containers: -name:nginx-ingress-controller image:"{{image_registry.addr}}/{{image.ingress}}" imagePullPolicy:IfNotPresent args: -/nginx-ingress-controller ---default-backend-service=$(POD_NAMESPACE)/default-http-backend ---configmap=$(POD_NAMESPACE)/nginx-configuration ---tcp-services-configmap=$(POD_NAMESPACE)/tcp-services ---udp-services-configmap=$(POD_NAMESPACE)/udp-services ---publish-service=$(POD_NAMESPACE)/ingress-nginx ---annotations-prefix=nginx.ingress.kubernetes.io #设置controller日志的输出路径和方式 ---log_dir=/var/log/nginx_ingress_controller ---logtostderr=false securityContext: capabilities: drop: -ALL add: -NET_BIND_SERVICE #www-data->33 runAsUser:33 env: -name:POD_NAME valueFrom: fieldRef: fieldPath:metadata.name -name:POD_NAMESPACE valueFrom: fieldRef: fieldPath:metadata.namespace ports: -name:http containerPort:80 -name:https containerPort:443 resources: requests: cpu:100m memory:256Mi livenessProbe: failureThreshold:3 httpGet: path:/healthz port:10254 scheme:HTTP initialDelaySeconds:10 periodSeconds:10 successThreshold:1 timeoutSeconds:1 readinessProbe: failureThreshold:3 httpGet: path:/healthz port:10254 scheme:HTTP periodSeconds:10 successThreshold:1 timeoutSeconds:1 volumeMounts: #配置挂载容器中控制器组件和nginx的日志输出路径 -name:logdir mountPath:/var/log/nginx_ingress_controller #配置nginx日志的logrotate配置挂载路径 -name:logrotateconf mountPath:/etc/logrotate.d/nginx.log subPath:nginx.log volumes: #控制器组件和nginx的日志输出路径为宿主机的hostpath -name:logdir hostPath: path:{{user_nginx_log.host_path}} type:"" #nginx日志的轮转配置文件来自于configmap -name:logrotateconf configMap: name:nginx-ingress-logrotate items: -key:nginx.log path:nginx.log --- apiVersion:apps/v1 kind:DaemonSet metadata: name:default-http-backend namespace:kube-system labels: app:default-http-backend spec: selector: matchLabels: app:default-http-backend template: metadata: labels: app:default-http-backend spec: terminationGracePeriodSeconds:60 tolerations: -key:dedicated value:ingress-nginx effect:NoSchedule affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: -matchExpressions: -key:"system/ingress" operator:In values: -"true" containers: -name:default-http-backend #Anyimageispermissibleaslongas: #1.Itservesa404pageat/ #2.Itserves200ona/healthzendpoint image:"{{image_registry.addr}}/{{image.http_backend}}" imagePullPolicy:IfNotPresent livenessProbe: httpGet: path:/healthz port:8080 scheme:HTTP initialDelaySeconds:30 timeoutSeconds:5 ports: -containerPort:8080 resources: limits: cpu:10m memory:20Mi requests: cpu:10m memory:20Mi ---
最后,有的人建议将initcontainer去掉,改为基于原有的nginx-ingress-controller镜像加一层layer,将配置路径权限的脚本放在该层执行。个人认为这种方法既不美观,也不方便。唯一的好处仅在于deployyaml仍然简洁(但少不了volumeMount之类的配置)。不过还是看个人使用感受吧~
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