Loki 日志系统详解

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-     背景    -

最近,在对公司容器云的日志方案进行设计的时候,发现主流的ELK或者EFK比较重,再加上现阶段对于ES复杂的搜索功能很多都用不上最终选择了Grafana开源的Loki日志系统,下面介绍下Loki的背景。

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-     缘起    -

当我们的容器云运行的应用或者某个节点出现问题了,解决思路应该如下:

Loki 日志系统详解_第1张图片

我们的监控使用的是基于Prometheus体系进行改造的,Prometheus中比较重要的是Metric和Alert,Metric是来说明当前或者历史达到了某个值,Alert设置Metric达到某个特定的基数触发了告警,但是这些信息明显是不够的。

我们都知道,Kubernetes的基本单位是Pod,Pod把日志输出到stdout和stderr,平时有什么问题我们通常在界面或者通过命令查看相关的日志,举个例子:当我们的某个Pod的内存变得很大,触发了我们的Alert,这个时候管理员,去页面查询确认是哪个Pod有问题,然后要确认Pod内存变大的原因,我们还需要去查询Pod的日志,如果没有日志系统,那么我们就需要到页面或者使用命令进行查询了:

Loki 日志系统详解_第2张图片

如果,这个时候应用突然挂了,这个时候我们就无法查到相关的日志了,所以需要引入日志系统,统一收集日志,而使用ELK的话,就需要在Kibana和Grafana之间切换,影响用户体验。所以 ,loki的第一目的就是最小化度量和日志的切换成本,有助于减少异常事件的响应时间和提高用户的体验。

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-     ELK 存在的问题    -

现有的很多日志采集的方案都是采用全文检索对日志进行索引(如ELK方案),优点是功能丰富,允许复杂的操作。但是,这些方案往往规模复杂,资源占用高,操作苦难。很多功能往往用不上,大多数查询只关注一定时间范围和一些简单的参数(如host、service等),使用这些解决方案就有点杀鸡用牛刀的感觉了。

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因此,Loki的第二个目的是,在查询语言的易操作性和复杂性之间可以达到一个权衡。

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-     成本    -

全文检索的方案也带来成本问题,简单的说就是全文搜索(如ES)的倒排索引的切分和共享的成本较高。后来出现了其他不同的设计方案如:OKlog,采用最终一致的、基于网格的分布策略。这两个设计决策提供了大量的成本降低和非常简单的操作,但是查询不够方便。因此,Loki的第三个目的是,提高一个更具成本效益的解决方案。

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-     架构    -

整体架构

Loki的架构如下:

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不难看出,Loki的架构非常简单,使用了和Prometheus一样的标签来作为索引,也就是说,你通过这些标签既可以查询日志的内容也可以查询到监控的数据,不但减少了两种查询之间的切换成本,也极大地降低了日志索引的存储。

Loki将使用与Prometheus相同的服务发现和标签重新标记库,编写了pormtail,在Kubernetes中promtail以DaemonSet方式运行在每个节点中,通过Kubernetes API等到日志的正确元数据,并将它们发送到Loki。下面是日志的存储架构:

Loki 日志系统详解_第5张图片

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-     读写    -

日志数据的写主要依托的是Distributor和Ingester两个组件,整体的流程如下:

Loki 日志系统详解_第6张图片

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-     Distributor    -

一旦promtail收集日志并将其发送给loki,Distributor就是第一个接收日志的组件。由于日志的写入量可能很大,所以不能在它们传入时将它们写入数据库。这会毁掉数据库。我们需要批处理和压缩数据。

Loki通过构建压缩数据块来实现这一点,方法是在日志进入时对其进行gzip操作,组件ingester是一个有状态的组件,负责构建和刷新chunck,当chunk达到一定的数量或者时间后,刷新到存储中去。每个流的日志对应一个ingester,当日志到达Distributor后,根据元数据和hash算法计算出应该到哪个ingester上面。

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此外,为了冗余和弹性,我们将其复制n(默认情况下为3)次。

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-     Ingester    -

Ingester接收到日志并开始构建chunk:

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基本上就是将日志进行压缩并附加到chunk上面。一旦chunk“填满”(数据达到一定数量或者过了一定期限),ingester将其刷新到数据库。我们对块和索引使用单独的数据库,因为它们存储的数据类型不同。

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刷新一个chunk之后,ingester然后创建一个新的空chunk并将新条目添加到该chunk中。

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-     Querier    -

读取就非常简单了,由Querier负责给定一个时间范围和标签选择器,Querier查看索引以确定哪些块匹配,并通过greps将结果显示出来。它还从Ingester获取尚未刷新的最新数据。

对于每个查询,一个查询器将为您显示所有相关日志。实现了查询并行化,提供分布式grep,使即使是大型查询也是足够的。

Loki 日志系统详解_第10张图片

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-     可扩展性    -

Loki的索引存储可以是cassandra/bigtable/dynamodb,而chuncks可以是各种对象存储,Querier和Distributor都是无状态的组件。对于ingester他虽然是有状态的但是,当新的节点加入或者减少,整节点间的chunk会重新分配,已适应新的散列环。而Loki底层存储的实现Cortex已经 在实际的生产中投入使用多年了。有了这句话,我可以放心的在环境中实验一把了。

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-     部署    -

Loki的安装非常简单。

创建namespace

 
   
oc new-project loki

权限设置

 
   
oc adm policy add-scc-to-user anyuid -z default -n loki
oc adm policy add-cluster-role-to-user cluster-admin system:serviceaccount:loki:default

安装Loki

安装命令:

 
   
oc create -f statefulset.json -n loki

statefulset.json如下:

 
   
{
    "apiVersion": "apps/v1",
    "kind": "StatefulSet",
    "metadata": {
        "name": "loki"
    },
    "spec": {
        "podManagementPolicy": "OrderedReady",
        "replicas": 1,
        "revisionHistoryLimit": 10,
        "selector": {
            "matchLabels": {
                "app": "loki"
            }
        },
        "serviceName": "womping-stoat-loki-headless",
        "template": {
            "metadata": {
                "annotations": {
                    "checksum/config": "da297d66ee53e0ce68b58e12be7ec5df4a91538c0b476cfe0ed79666343df72b",
                    "prometheus.io/port": "http-metrics",
                    "prometheus.io/scrape": "true"
                },
                "creationTimestamp": null,
                "labels": {
                    "app": "loki",
                    "name": "loki"
                }
            },
            "spec": {
                "affinity": {},
                "containers": [
                    {
                        "args": [
                            "-config.file=/etc/loki/local-config.yaml"
                        ],
                        "image": "grafana/loki:latest",
                        "imagePullPolicy": "IfNotPresent",
                        "livenessProbe": {
                            "failureThreshold": 3,
                            "httpGet": {
                                "path": "/ready",
                                "port": "http-metrics",
                                "scheme": "HTTP"
                            },
                            "initialDelaySeconds": 45,
                            "periodSeconds": 10,
                            "successThreshold": 1,
                            "timeoutSeconds": 1
                        },
                        "name": "loki",
                        "ports": [
                            {
                                "containerPort": 3100,
                                "name": "http-metrics",
                                "protocol": "TCP"
                            }
                        ],
                        "readinessProbe": {
                            "failureThreshold": 3,
                            "httpGet": {
                                "path": "/ready",
                                "port": "http-metrics",
                                "scheme": "HTTP"
                            },
                            "initialDelaySeconds": 45,
                            "periodSeconds": 10,
                            "successThreshold": 1,
                            "timeoutSeconds": 1
                        },
                        "resources": {},
                        "terminationMessagePath": "/dev/termination-log",
                        "terminationMessagePolicy": "File",
                        "volumeMounts": [
                            {
                                "mountPath": "/tmp/loki",
                                "name": "storage"
                            }
                        ]
                    }
                ],
                "dnsPolicy": "ClusterFirst",
                "restartPolicy": "Always",
                "schedulerName": "default-scheduler",
                "terminationGracePeriodSeconds": 30,
                "volumes": [
                    {
                        "emptyDir": {},
                        "name": "storage"
                    }
                ]
            }
        },
        "updateStrategy": {
            "type": "RollingUpdate"
        }
    }
}

安装Promtail

安装命令:

 
   
oc create -f configmap.json -n loki

configmap.json如下:

 
   
{
    "apiVersion": "v1",
    "data": {
        "promtail.yaml": "client:\n  backoff_config:\n    maxbackoff: 5s\n    maxretries: 5\n    minbackoff: 100ms\n  batchsize: 102400\n  batchwait: 1s\n  external_labels: {}\n  timeout: 10s\npositions:\n  filename: /run/promtail/positions.yaml\nserver:\n  http_listen_port: 3101\ntarget_config:\n  sync_period: 10s\n\nscrape_configs:\n- job_name: kubernetes-pods-name\n  pipeline_stages:\n    - docker: {}\n    \n  kubernetes_sd_configs:\n  - role: pod\n  relabel_configs:\n  - source_labels:\n    - __meta_kubernetes_pod_label_name\n    target_label: __service__\n  - source_labels:\n    - __meta_kubernetes_pod_node_name\n    target_label: __host__\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __service__\n  - action: labelmap\n    regex: __meta_kubernetes_pod_label_(.+)\n  - action: replace\n    replacement: $1\n    separator: /\n    source_labels:\n    - __meta_kubernetes_namespace\n    - __service__\n    target_label: job\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_namespace\n    target_label: namespace\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_name\n    target_label: instance\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_container_name\n    target_label: container_name\n  - replacement: /var/log/pods/*$1/*.log\n    separator: /\n    source_labels:\n    - __meta_kubernetes_pod_uid\n    - __meta_kubernetes_pod_container_name\n    target_label: __path__\n- job_name: kubernetes-pods-app\n  pipeline_stages:\n    - docker: {}\n    \n  kubernetes_sd_configs:\n  - role: pod\n  relabel_configs:\n  - action: drop\n    regex: .+\n    source_labels:\n    - __meta_kubernetes_pod_label_name\n  - source_labels:\n    - __meta_kubernetes_pod_label_app\n    target_label: __service__\n  - source_labels:\n    - __meta_kubernetes_pod_node_name\n    target_label: __host__\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __service__\n  - action: labelmap\n    regex: __meta_kubernetes_pod_label_(.+)\n  - action: replace\n    replacement: $1\n    separator: /\n    source_labels:\n    - __meta_kubernetes_namespace\n    - __service__\n    target_label: job\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_namespace\n    target_label: namespace\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_name\n    target_label: instance\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_container_name\n    target_label: container_name\n  - replacement: /var/log/pods/*$1/*.log\n    separator: /\n    source_labels:\n    - __meta_kubernetes_pod_uid\n    - __meta_kubernetes_pod_container_name\n    target_label: __path__\n- job_name: kubernetes-pods-direct-controllers\n  pipeline_stages:\n    - docker: {}\n    \n  kubernetes_sd_configs:\n  - role: pod\n  relabel_configs:\n  - action: drop\n    regex: .+\n    separator: ''\n    source_labels:\n    - __meta_kubernetes_pod_label_name\n    - __meta_kubernetes_pod_label_app\n  - action: drop\n    regex: ^([0-9a-z-.]+)(-[0-9a-f]{8,10})$\n    source_labels:\n    - __meta_kubernetes_pod_controller_name\n  - source_labels:\n    - __meta_kubernetes_pod_controller_name\n    target_label: __service__\n  - source_labels:\n    - __meta_kubernetes_pod_node_name\n    target_label: __host__\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __service__\n  - action: labelmap\n    regex: __meta_kubernetes_pod_label_(.+)\n  - action: replace\n    replacement: $1\n    separator: /\n    source_labels:\n    - __meta_kubernetes_namespace\n    - __service__\n    target_label: job\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_namespace\n    target_label: namespace\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_name\n    target_label: instance\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_container_name\n    target_label: container_name\n  - replacement: /var/log/pods/*$1/*.log\n    separator: /\n    source_labels:\n    - __meta_kubernetes_pod_uid\n    - __meta_kubernetes_pod_container_name\n    target_label: __path__\n- job_name: kubernetes-pods-indirect-controller\n  pipeline_stages:\n    - docker: {}\n    \n  kubernetes_sd_configs:\n  - role: pod\n  relabel_configs:\n  - action: drop\n    regex: .+\n    separator: ''\n    source_labels:\n    - __meta_kubernetes_pod_label_name\n    - __meta_kubernetes_pod_label_app\n  - action: keep\n    regex: ^([0-9a-z-.]+)(-[0-9a-f]{8,10})$\n    source_labels:\n    - __meta_kubernetes_pod_controller_name\n  - action: replace\n    regex: ^([0-9a-z-.]+)(-[0-9a-f]{8,10})$\n    source_labels:\n    - __meta_kubernetes_pod_controller_name\n    target_label: __service__\n  - source_labels:\n    - __meta_kubernetes_pod_node_name\n    target_label: __host__\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __service__\n  - action: labelmap\n    regex: __meta_kubernetes_pod_label_(.+)\n  - action: replace\n    replacement: $1\n    separator: /\n    source_labels:\n    - __meta_kubernetes_namespace\n    - __service__\n    target_label: job\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_namespace\n    target_label: namespace\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_name\n    target_label: instance\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_container_name\n    target_label: container_name\n  - replacement: /var/log/pods/*$1/*.log\n    separator: /\n    source_labels:\n    - __meta_kubernetes_pod_uid\n    - __meta_kubernetes_pod_container_name\n    target_label: __path__\n- job_name: kubernetes-pods-static\n  pipeline_stages:\n    - docker: {}\n    \n  kubernetes_sd_configs:\n  - role: pod\n  relabel_configs:\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __meta_kubernetes_pod_annotation_kubernetes_io_config_mirror\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_label_component\n    target_label: __service__\n  - source_labels:\n    - __meta_kubernetes_pod_node_name\n    target_label: __host__\n  - action: drop\n    regex: ^$\n    source_labels:\n    - __service__\n  - action: labelmap\n    regex: __meta_kubernetes_pod_label_(.+)\n  - action: replace\n    replacement: $1\n    separator: /\n    source_labels:\n    - __meta_kubernetes_namespace\n    - __service__\n    target_label: job\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_namespace\n    target_label: namespace\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_name\n    target_label: instance\n  - action: replace\n    source_labels:\n    - __meta_kubernetes_pod_container_name\n    target_label: container_name\n  - replacement: /var/log/pods/*$1/*.log\n    separator: /\n    source_labels:\n    - __meta_kubernetes_pod_annotation_kubernetes_io_config_mirror\n    - __meta_kubernetes_pod_container_name\n    target_label: __path__\n"
    },
    "kind": "ConfigMap",
    "metadata": {
        "creationTimestamp": "2019-09-05T01:05:03Z",
        "labels": {
            "app": "promtail",
            "chart": "promtail-0.12.0",
            "heritage": "Tiller",
            "release": "lame-zorse"
        },
        "name": "lame-zorse-promtail",
        "namespace": "loki",
        "resourceVersion": "17921611",
        "selfLink": "/api/v1/namespaces/loki/configmaps/lame-zorse-promtail",
        "uid": "30fcb896-cf79-11e9-b58e-e4a8b6cc47d2"
    }
}




oc create -f daemonset.json -n loki

daemonset.json如下:

{
            "apiVersion": "apps/v1",
            "kind": "DaemonSet",
            "metadata": {
                "annotations": {
                    "deployment.kubernetes.io/revision": "2"
                },
                "creationTimestamp": "2019-09-05T01:16:37Z",
                "generation": 2,
                "labels": {
                    "app": "promtail",
                    "chart": "promtail-0.12.0",
                    "heritage": "Tiller",
                    "release": "lame-zorse"
                },
                "name": "lame-zorse-promtail",
                "namespace": "loki"
            },
            "spec": {
                "progressDeadlineSeconds": 600,
                "replicas": 1,
                "revisionHistoryLimit": 10,
                "selector": {
                    "matchLabels": {
                        "app": "promtail",
                        "release": "lame-zorse"
                    }
                },
                "strategy": {
                    "rollingUpdate": {
                        "maxSurge": 1,
                        "maxUnavailable": 1
                    },
                    "type": "RollingUpdate"
                },
                "template": {
                    "metadata": {
                        "annotations": {
                            "checksum/config": "75a25ee4f2869f54d394bf879549a9c89c343981a648f8d878f69bad65dba809",
                            "prometheus.io/port": "http-metrics",
                            "prometheus.io/scrape": "true"
                        },
                        "creationTimestamp": null,
                        "labels": {
                            "app": "promtail",
                            "release": "lame-zorse"
                        }
                    },
                    "spec": {
                        "affinity": {},
                        "containers": [
                            {
                                "args": [
                                    "-config.file=/etc/promtail/promtail.yaml",
                                    "-client.url=http://loki.loki.svc:3100/api/prom/push"
                                ],
                                "env": [
                                    {
                                        "name": "HOSTNAME",
                                        "valueFrom": {
                                            "fieldRef": {
                                                "apiVersion": "v1",
                                                "fieldPath": "spec.nodeName"
                                            }
                                        }
                                    }
                                ],
                                "image": "grafana/promtail:v0.3.0",
                                "imagePullPolicy": "IfNotPresent",
                                "name": "promtail",
                                "ports": [
                                    {
                                        "containerPort": 3101,
                                        "name": "http-metrics",
                                        "protocol": "TCP"
                                    }
                                ],
                                "readinessProbe": {
                                    "failureThreshold": 5,
                                    "httpGet": {
                                        "path": "/ready",
                                        "port": "http-metrics",
                                        "scheme": "HTTP"
                                    },
                                    "initialDelaySeconds": 10,
                                    "periodSeconds": 10,
                                    "successThreshold": 1,
                                    "timeoutSeconds": 1
                                },
                                "resources": {},
                                "securityContext": {
                                    "readOnlyRootFilesystem": true,
                                    "runAsUser": 0
                                },
                                "terminationMessagePath": "/dev/termination-log",
                                "terminationMessagePolicy": "File",
                                "volumeMounts": [
                                    {
                                        "mountPath": "/etc/promtail",
                                        "name": "config"
                                    },
                                    {
                                        "mountPath": "/run/promtail",
                                        "name": "run"
                                    },
                                    {
                                        "mountPath": "/var/lib/docker/containers",
                                        "name": "docker",
                                        "readOnly": true
                                    },
                                    {
                                        "mountPath": "/var/log/pods",
                                        "name": "pods",
                                        "readOnly": true
                                    }
                                ]
                            }
                        ],
                        "dnsPolicy": "ClusterFirst",
                        "restartPolicy": "Always",
                        "schedulerName": "default-scheduler",
                        "securityContext": {},
                        "terminationGracePeriodSeconds": 30,
                        "volumes": [
                            {
                                "configMap": {
                                    "defaultMode": 420,
                                    "name": "lame-zorse-promtail"
                                },
                                "name": "config"
                            },
                            {
                                "hostPath": {
                                    "path": "/run/promtail",
                                    "type": ""
                                },
                                "name": "run"
                            },
                            {
                                "hostPath": {
                                    "path": "/var/lib/docker/containers",
                                    "type": ""
                                },
                                "name": "docker"
                            },
                            {
                                "hostPath": {
                                    "path": "/var/log/pods",
                                    "type": ""
                                },
                                "name": "pods"
                            }
                        ]
                    }
                }
            }
        }
安装服务
 
   
oc create -f service.json -n loki

service.json的内容如下:

{
    "apiVersion": "v1",
    "kind": "Service",
    "metadata": {
        "creationTimestamp": "2019-09-04T09:37:49Z",
        "name": "loki",
        "namespace": "loki",
        "resourceVersion": "17800188",
        "selfLink": "/api/v1/namespaces/loki/services/loki",
        "uid": "a87fe237-cef7-11e9-b58e-e4a8b6cc47d2"
    },
    "spec": {
        "externalTrafficPolicy": "Cluster",
        "ports": [
            {
                "name": "lokiport",
                "port": 3100,
                "protocol": "TCP",
                "targetPort": 3100
            }
        ],
        "selector": {
            "app": "loki"
        },
        "sessionAffinity": "None",
        "type": "NodePort"
    },
    "status": {
        "loadBalancer": {}
    }

c3774c140d24fd700196e45a0dce959b.png

-     语法    -

Loki提供了HTTP接口,我们这里就不详解了,大家可以看:https://github.com/grafana/loki/blob/master/docs/api.md

我们这里说下查询的接口如何使用。

第一步,获取当前Loki的元数据类型:

 
   
curl http://192.168.25.30:30972/api/prom/label
{
 "values": ["alertmanager", "app", "component", "container_name", "controller_revision_hash", "deployment", "deploymentconfig", "docker_registry", "draft", "filename", "instance", "job", "logging_infra", "metrics_infra", "name", "namespace", "openshift_io_component", "pod_template_generation", "pod_template_hash", "project", "projectname", "prometheus", "provider", "release", "router", "servicename", "statefulset_kubernetes_io_pod_name", "stream", "tekton_dev_pipeline", "tekton_dev_pipelineRun", "tekton_dev_pipelineTask", "tekton_dev_task", "tekton_dev_taskRun", "type", "webconsole"]
}

第二步,获取某个元数据类型的值:

 
   
curl http://192.168.25.30:30972/api/prom/label/namespace/values
{"values":["cicd","default","gitlab","grafanaserver","jenkins","jx-staging","kube-system","loki","mysql-exporter","new2","openshift-console","openshift-infra","openshift-logging","openshift-monitoring","openshift-node","openshift-sdn","openshift-web-console","tekton-pipelines","test111"]}

第三步,根据label进行查询,例如:

 
   
http://192.168.25.30:30972/api/prom/query?direction=BACKWARD&limit=1000®exp=&query={namespace="cicd"}&start=1567644457221000000&end=1567730857221000000&refId=A

参数解析:

  • query:一种查询语法详细见下面章节,{name=~“mysql.+”} or {namespace=“cicd”} |= "error"表示查询,namespace为CI/CD的日志中,有error字样的信息。

  • limit:返回日志的数量

  • start:开始时间,Unix时间表示方法 默认为,一小时前时间

  • end:结束时间,默认为当前时间

  • direction:forward或者backward,指定limit时候有用,默认为 backward

  • regexp:对结果进行regex过滤

c0f58d7f630498e2e58eba24afcf2e22.png

-     LogQL 语法    -

选择器

对于查询表达式的标签部分,将放在{}中,多个标签表达式用逗号分隔:

 
   
{app="mysql",name="mysql-backup"}

支持的符号有:

  • =:完全相同。

  • !=:不平等。

  • =~:正则表达式匹配。

  • !~:不要正则表达式匹配。

441a25eeab0e340cf5e5b9cf5389412c.png

-     过滤表达式    -

编写日志流选择器后,您可以通过编写搜索表达式进一步过滤结果。搜索表达式可以文本或正则表达式。

如:

  • {job=“mysql”} |= “error”

  • {name=“kafka”} |~ “tsdb-ops.*io:2003”

  • {instance=~“kafka-[23]”,name=“kafka”} != kafka.server:type=ReplicaManager

支持多个过滤:

  • {job=“mysql”} |= “error” != “timeout”

目前支持的操作符:

  • |= line包含字符串。

  • != line不包含字符串。

  • |~ line匹配正则表达式。

  • !~ line与正则表达式不匹配。

表达式遵循https://github.com/google/re2/wiki/Syntax语法。

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