k8s 全面掌控日志系统

概述

为了提高系统运维和故障排查的效率，日志系统采用 ELK（Elasticsearch、Logstash、Kibana）技术栈，通过 FileBeats 作为日志收集器，将来自不同节点的日志数据汇总并存储在 Elasticsearch 中，最终通过 Kibana 进行可视化展示和分析。

系统配置包括 FileBeats 的收集规则、Logstash 的处理管道和 Elasticsearch 的索引设置。部署过程采用 Kubernetes 的 Helm Chart 实现，简化了安装和管理。

架构

FileBeats + Kafka + ELK

⚡️：在不影响旧有日志系统运行的前提下，我们在现有的 ELK+Kafka 架构基础上，新增了 Filebeat 作为日志收集器，用于采集 Kubernetes 日志。

在这里插入图片描述

日志采集器Logstash其功能虽然强大，但是它依赖java、在数据量大的时候，Logstash进程会消耗过多的系统资源，这将严重影响业务系统的性能，而filebeat就是一个完美的替代者，它基于Go语言没有任何依赖，配置文件简单，格式明了，同时filebeat比logstash更加轻量级，所以占用系统资源极少，非常适合安装在生产机器上。这就是推荐使用filebeat，也是 ELK Stack 在 Agent 的第一选择。
此架构适合大型集群、海量数据的业务场景，它通过将前端Logstash Agent替换成filebeat，有效降低了收集日志对业务系统资源的消耗。同时，消息队列使用kafka集群架构，有效保障了收集数据的安全性和稳定性，而后端Logstash和Elasticsearch均采用集群模式搭建，从整体上提高了ELK系统的高效性、扩展性和吞吐量。我所在的项目组采用的就是这套架构，由于生产所需的配置较高，且涉及较多持久化操作，采用的都是性能高配的云主机搭建方式而非时下流行的容器搭建

部署

elasticsearch

安装方式：helm

安装版本：8.5.1

⚡️ helm安装8版本elastic默认开启ssl认证，我们这边禁用认证

开始前奏操作，生成secret

# 根据提供的 elastic-certificates.p12 将 pcks12 中的信息分离出来，写入文件
openssl pkcs12 -nodes -passin pass:'' -in elastic-certificates.p12 -out elastic-certificate.pem

添加证书和密码到集群
# 添加证书
kubectl create secret generic elastic-certificates --from-file=elastic-certificates.p12
kubectl create secret generic elastic-certificate-pem --from-file=elastic-certificate.pem

# 设置集群用户名密码，用户名不建议修改
##命令行
kubectl create secret generic elastic-credentials \
  --from-literal=username=elastic --from-literal=password=123456
##yaml
apiVersion: v1
data:
  password: MTIzNDU2
  username: ZWxhc3RpYw==
kind: Secret
metadata:
  name: elastic-credentials
  namespace: elastic
type: Opaque

🏴 加油特种兵

先添加elasticsearch的helm仓库，并拉取对应版本的Charts并对其解压

[root@ycloud ~]# helm repo add elastic https://helm.elastic.co
"elastic" has been added to your repositories
[root@ycloud ~]# helm pull elastic/elasticsearch --version 8.5.1
[root@ycloud ~]# tar -zxvf elasticsearch-8.5.1.tgz 
elasticsearch/Chart.yaml
elasticsearch/values.yaml
......

调整values

replicas: 2
minimumMasterNodes: 1

esMajorVersion: ""

# Allows you to add any config files in /usr/share/elasticsearch/config/
# such as elasticsearch.yml and log4j2.properties

# ==================安全配置========================
protocol: http

###挂在证书，这里用我们上面创建的证书
secretMounts: 
  - name: elastic-certificates
    secretName: elastic-certificates
    path: /usr/share/elasticsearch/config/certs
    defaultMode: 0755

esConfig: 
  elasticsearch.yml: |
    xpack.security.enabled: true
    xpack.security.transport.ssl.enabled: true
    xpack.security.transport.ssl.verification_mode: certificate
    xpack.security.transport.ssl.keystore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
    xpack.security.transport.ssl.truststore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
#    key:
#      nestedkey: value
#  log4j2.properties: |
#    key = value

## 关闭ssl认证
createCert: false        
esJavaOpts: "-Xmx1g -Xms1g"

###指定elastic用户密码
extraEnvs: 
  - name: ELASTIC_USERNAME
    valueFrom:
      secretKeyRef:
        name: elastic-credentials    ###用我们创建的secret
        key: username
  - name: ELASTIC_PASSWORD
    valueFrom:
      secretKeyRef:
        name: elastic-credentials		###用我们创建的secret
        key: password
###true开启持久化
persistence:
  enabled: true

kibana

安装方式：helm

安装版本：8.5.1

⚡️: 默认使用身份验证和TLS部署Kibana 8.5.1连接到Elasticsearch

🐤:重置kibana_system账户密码

[root@ycloud hub]# kubectl exec -it elasticsearch-master-0 -- bin/elasticsearch-reset-password -u kibana_system
Defaulted container "elasticsearch" out of: elasticsearch, configure-sysctl (init)
This tool will reset the password of the [kibana_system] user to an autogenerated value.
The password will be printed in the console.
Please confirm that you would like to continue [y/N]y


Password for the [kibana_system] user successfully reset.
New value: nVUE*km=842x7duqB4TR

🐤:更新 elastic-credentials文件

# [root@ycloud hub]# echo nVUE*km=842x7duqB4TR|base64 
blZVRSprbT04NDJ4N2R1cUI0VFIK
apiVersion: v1
data:
  kibana_password: blZVRSprbT04NDJ4N2R1cUI0VFIK 
  kibana_username: a2liYW5hX3N5c3RlbQ==
  password: MTIzNDU2
  username: ZWxhc3RpYw==
kind: Secret
metadata:
  name: elastic-credentials
  namespace: elastic
type: Opaque

🏴 加油特种兵

先添加kibana的helm仓库，并拉取对应版本的Charts并对其解压

[root@ycloud ~]# helm repo add elastic https://helm.elastic.co
"elastic" has been added to your repositories
[root@ycloud ~]# helm pull elastic/kibana --version 8.5.1
[root@ycloud ~]# tar -zxvf kibana-8.5.1.tgz 
kibana/Chart.yaml
kibana/values.yaml
......

调整template

# cd kibana/templates/ ； rm -rf post-delete-* pre-install-*
##删除deployment.yaml部分内容
---
          - name: ELASTICSEARCH_SSL_CERTIFICATEAUTHORITIES
            value: "{{ template "kibana.home_dir" . }}/config/certs/{{ .Values.elasticsearchCertificateAuthoritiesFile }}"
          - name: ELASTICSEARCH_SERVICEACCOUNTTOKEN
            valueFrom:
              secretKeyRef:
                name: {{ template "kibana.fullname" . }}-es-token
                key: token
                optional: false
--- 
        readinessProbe:
{{ toYaml .Values.readinessProbe | indent 10 }}
          exec:
            command:
              - bash
              - -c
              - |
                #!/usr/bin/env bash -e

                # Disable nss cache to avoid filling dentry cache when calling curl
                # This is required with Kibana Docker using nss < 3.52
                export NSS_SDB_USE_CACHE=no

                http () {
                    local path="${1}"
                    set -- -XGET -s --fail -L

                    if [ -n "${ELASTICSEARCH_USERNAME}" ] && [ -n "${ELASTICSEARCH_PASSWORD}" ]; then
                      set -- "$@" -u "${ELASTICSEARCH_USERNAME}:${ELASTICSEARCH_PASSWORD}"
                    fi

                    STATUS=$(curl --output /dev/null --write-out "%{http_code}" -k "$@" "{{ .Values.protocol }}://localhost:{{ .Values.httpPort }}${path}")
                    if [[ "${STATUS}" -eq 200 ]]; then
                      exit 0
                    fi

                    echo "Error: Got HTTP code ${STATUS} but expected a 200"
                    exit 1
                }

                http "{{ .Values.healthCheckPath }}"
---
        - name: elasticsearch-certs
          secret:
            secretName: {{ .Values.elasticsearchCertificateSecret }}
---
          - name: elasticsearch-certs
            mountPath: {{ template "kibana.home_dir" . }}/config/certs
            readOnly: true
---

调整values

# cd kibana/templates/
# rm -rf post-delete-* pre-install-*
---
elasticsearchHosts: "http://elasticsearch-master:9200"
#elasticsearchCertificateSecret: elasticsearch-master-certs
#elasticsearchCertificateAuthoritiesFile: ca.crt
elasticsearchCredentialSecret: elastic-credentials

replicas: 1

extraEnvs:
  - name: "NODE_OPTIONS"
    value: "--max-old-space-size=1800"
  - name: 'ELASTICSEARCH_USERNAME'
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: kibana_username
  - name: 'ELASTICSEARCH_PASSWORD'
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: kibana_password
        
resources:
  requests:
    cpu: "1000m"
    memory: "2Gi"
  limits:
    cpu: "1000m"
    memory: "2Gi"

protocol: http

serverHost: "0.0.0.0"

healthCheckPath: "/app/kibana"