Kubernetes使用

2025-02-19

使用前提

已部署Kubernetes集群或minikube

具备访问Kubernetes集群的kubectl

采集Kubernetes容器日志

创建部署 LoongCollector 的命名空间

将下面内容保存为loongcollector-ns.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: loongcollector

您也可以直接从下面的地址下载示例配置。

wget https://raw.githubusercontent.com/alibaba/loongcollector/main/example_config/start_with_k8s/loongcollector-ns.yaml

应用上述配置

kubectl apply -f loongcollector-ns.yaml

创建配置 LoongCollector 的 ConfigMap 和 Secret

将下面内容保存为loongcollector-user-configmap.yaml。该ConfigMap后续将作为配置目录挂载到LoongCollector 容器中，因此可包含多个采集配置。

apiVersion: v1
kind: ConfigMap
metadata:
  name: loongcollector-user-configmap
  namespace: loongcollector
data:
  nginx_stdout.yaml: |
    enable: true
    inputs:
      - Type: service_docker_stdout
        Stderr: false
        Stdout: true                # only collect stdout
        IncludeK8sLabel:
          app: nginx                # choose containers with this label
    processors:
      - Type: processor_regex       # structure log
        SourceKey: content
        Regex: '([\d\.:]+) - (\S+) \[(\S+) \S+\] \"(\S+) (\S+) ([^\\"]+)\" (\d+) (\d+) \"([^\\"]*)\" \"([^\\"]*)\" \"([^\\"]*)\"'
        Keys:
          - remote_addr
          - remote_user
          - time_local
          - method
          - url
          - protocol
          - status
          - body_bytes_sent
          - http_referer
          - http_user_agent
          - http_x_forwarded_for
    flushers:
      - Type: flusher_stdout
        OnlyStdout: true

将下面内容保存为loongcollector-secret.yaml。该Secret为可选，当需要将日志写入SLS时会用到。

apiVersion: v1
kind: Secret
metadata:
  name: loongcollector-secret
  namespace: loongcollector
type: Opaque
data:
  access_key_id:  # base64 accesskey id if you want to flush to SLS
  access_key:     # base64 accesskey secret if you want to flush to SLS

您也可以直接从下面的地址下载示例配置。

wget https://raw.githubusercontent.com/alibaba/loongcollector/main/example_config/start_with_k8s/loongcollector-user-configmap.yaml
wget https://raw.githubusercontent.com/alibaba/loongcollector/main/example_config/start_with_k8s/loongcollector-secret.yaml

应用上述配置

kubectl apply -f loongcollector-user-configmap.yaml
kubectl apply -f loongcollector-secret.yaml

创建 LoongCollector DaemonSet

将下面内容保存为loongcollector-daemonset.yaml。

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: loongcollector-ds
  namespace: loongcollector
  labels:
    k8s-app: loongcollector-ds
spec:
  selector:
    matchLabels:
      k8s-app: loongcollector-ds
  template:
    metadata:
      labels:
        k8s-app: loongcollector-ds
    spec:
      tolerations:
        - operator: Exists                    # deploy on all nodes
      containers:
        - name: loongcollector
          env:
            - name: ALIYUN_LOG_ENV_TAGS       # add log tags from env
              value: _node_name_|_node_ip_
            - name: _node_name_
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: spec.nodeName
            - name: _node_ip_
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.hostIP
            - name: cpu_usage_limit           # loongcollector's self monitor cpu limit
              value: "1"
            - name: mem_usage_limit           # loongcollector's self monitor mem limit
              value: "512"
            - name: default_access_key_id     # accesskey id if you want to flush to SLS
              valueFrom:
                secretKeyRef:
                  name: loongcollector-secret
                  key: access_key_id
                  optional: true
            - name: default_access_key        # accesskey secret if you want to flush to SLS
              valueFrom:
                secretKeyRef:
                  name: loongcollector-secret
                  key: access_key
                  optional: true
          image: >-
            sls-opensource-registry.cn-shanghai.cr.aliyuncs.com/loongcollector-community-edition/loongcollector:0.2.0
          imagePullPolicy: IfNotPresent
          resources:
            limits:
              cpu: 1000m
              memory: 1Gi
            requests:
              cpu: 400m
              memory: 384Mi
          volumeMounts:
            - mountPath: /var/run                       # for container runtime socket
              name: run
            - mountPath: /logtail_host                  # for log access on the node
              mountPropagation: HostToContainer
              name: root
              readOnly: true
            - mountPath: /usr/local/loongcollector/data # for checkpoint between container restart
              name: checkpoint
            - mountPath: /usr/local/loongcollector/conf/continuous_pipeline_config/local # mount config dir
              name: user-config
              readOnly: true
      dnsPolicy: ClusterFirstWithHostNet
      hostNetwork: true
      volumes:
        - hostPath:
            path: /var/run
            type: Directory
          name: run
        - hostPath:
            path: /
            type: Directory
          name: root
        - hostPath:
            path: /etc/loongcollector-loongcollector-ds/checkpoint
            type: DirectoryOrCreate
          name: checkpoint
        - configMap:
            defaultMode: 420
            name: loongcollector-user-configmap
          name: user-config

您也可以直接从下面的地址下载示例配置。

wget https://raw.githubusercontent.com/alibaba/loongcollector/main/example_config/start_with_k8s/loongcollector-daemonset.yaml

添加参数示例

        - name: loongcollector
          command:
            - /usr/local/loongcollector/loongcollector_control.sh
          args:
            - "start_and_block"
            - "-dirfile_check_interval_ms=5000"
            - "-logtail_checkpoint_check_gc_interval_sec=120"
          env:
            - name: enable_containerd_upper_dir_detect
              value: "true"

应用上述配置

kubectl apply -f loongcollector-daemonset.yaml

部署用来测试的 nginx

将下面内容保存为nginx-deployment.yaml。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  namespace: default
  labels:
    app: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - image: 'nginx:latest'
          name: nginx
          ports:
            - containerPort: 80
              name: http
              protocol: TCP
          resources:
            requests:
              cpu: 100m
              memory: 100Mi

您也可以直接从下面的地址下载示例配置。

wget https://raw.githubusercontent.com/alibaba/loongcollector/main/example_config/start_with_k8s/nginx-deployment.yaml

应用上述配置

kubectl apply -f nginx-deployment.yaml

发送请求构造示例日志

kubectl exec nginx-<pod-id> -- curl localhost/hello/loongcollector

查看采集到的测试容器标准输出日志

kubectl logs loongcollector-ds-<pod-id> -n loongcollector

结果为

2024-12-05 08:53:45 {"_time_":"2024-12-05T16:53:42.165362808+08:00","_source_":"stdout","_pod_name_":"nginx-b9cf9cc78-8tzpx","_namespace_":"default","_pod_uid_":"6deb87e1-02b3-4002-a556-32a3f668cd6f","_container_ip_":"192.168.0.65","_image_name_":"docker.io/library/nginx:latest","_container_name_":"nginx","remote_addr":"127.0.0.1","remote_user":"-","time_local":"05/Dec/2024:08:53:42","method":"GET","url":"/hello/loongcollector","protocol":"HTTP/1.1","status":"404","body_bytes_sent":"153","http_referer":"-","http_user_agent":"curl/7.88.1","http_x_forwarded_for":"-","__time__":"1733388822"}

采集模版

了解采集配置结构：采集配置

查看更多K8s采集日志模版（从容器中采集文件日等）：https://github.com/alibaba/loongcollector/blob/main/k8s_templates

参考更多可组合的日志采集和处理配置样例：https://github.com/alibaba/loongcollector/blob/main/example_config