Методические материалы Лохтурова Вячеслава

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====== Сервис VictoriaMetrics ======

===== Метрики =====

  * [[https://docs.victoriametrics.com/sd_configs/|vmagent and single-node VictoriaMetrics supports the following Prometheus-compatible service discovery]]

  * [[https://docs.victoriametrics.com/guides/k8s-monitoring-via-vm-cluster/|Kubernetes monitoring with VictoriaMetrics Cluster]]

  * [[https://docs.victoriametrics.com/guides/k8s-monitoring-via-vm-single/|Kubernetes monitoring via VictoriaMetrics Single]]

  * [[https://docs.victoriametrics.com/scrape_config_examples/]]

  * [[Система Kubernetes#kube-state-metrics]]
<code>
(venv1) server# ansible all -f 4 -m apt -a 'pkg=prometheus-node-exporter state=present update_cache=true' -i /root/kubespray/inventory/mycluster/hosts.yaml

kube1# helm repo add vm https://victoriametrics.github.io/helm-charts/
kube1# helm repo update

kube1:~/vm# cat guide-vmsingle-values.yaml
</code><code>
...
        - job_name: kube-state-metrics
          kubernetes_sd_configs:
          - role: pod
          relabel_configs:
          - source_labels: [__meta_kubernetes_pod_container_name]
            regex: kube-state-metrics
            action: keep
          - source_labels: [__meta_kubernetes_pod_container_port_number]
            regex: "8080"
            action: keep

        - job_name: node-exporter
          static_configs:
            - targets:
              - kube1.corpX.un:9100
              - kube2.corpX.un:9100
              - kube3.corpX.un:9100
</code><code>
kube1:~/vm# helm upgrade -i vmsingle vm/victoria-metrics-single -f guide-vmsingle-values.yaml -n vm --create-namespace

kube1:~/vm# kubectl scale --replicas 1 statefulset vmsingle-victoria-metrics-single-server -n vm

cmder> kubectl port-forward svc/vmsingle-victoria-metrics-single-server 8428 -n vm
</code>

  * Сервис Grafana в [[Сервис Grafana#Kubernetes]]

===== Уведомления =====

  * [[Сервис Prometheus#prometheus-alertmanager]] (ссылки на правила)

<code>
(venv1) server# ansible-playbook /root/conf/ansible/roles/mail.yml

kube1:~/vm# helm show values vm/victoria-metrics-alert > vm-alert-values.yaml

$ wget -qO - https://raw.githubusercontent.com/samber/awesome-prometheus-alerts/master/dist/rules/host-and-hardware/node-exporter.yml | sed 's/^/    /'

$ wget -qO - https://raw.githubusercontent.com/samber/awesome-prometheus-alerts/master/dist/rules/kubernetes/kubestate-exporter.yml | sed 's/^/    /'

kube1:~/vm# cat vm-alert-values.yaml
</code><code>
...
server:
...
  datasource:
    url: "http://vmsingle-victoria-metrics-single-server:8428"
#    url: "http://vmsingle-victoria-metrics-single-server.vm.svc.cluster.local:8428"
#    url: "http://vmcluster-victoria-metrics-cluster-vmselect.vm.svc.cluster.local:8481/select/0/prometheus/"
...
  notifier:
    alertmanager:
      url: "http://alertmanager:9093"
...
  config:
    alerts:
#      groups: []
      groups:
      - name: NodeExporter
...   
      - name: KubestateExporter
        rules:
        - alert: KubernetesContainerOomKiller
          expr: (kube_pod_container_status_restarts_total - kube_pod_container_status_restarts_total offset 10m >= 1) and ignoring (reason) min_over_time(kube_pod_container_status_last_terminated_reason{reason="OOMKilled"}[10m]) == 1
          for: 0m
          labels:
            severity: warning
          annotations:
            summary: Kubernetes Container oom killer (instance {{ $labels.instance }})
            description: "Container {{ $labels.container }} in pod {{ $labels.namespace }}/{{ $labels.pod }} has been OOMKill"
...
alertmanager:
...
  enabled: true
...
  config:
    global:
      smtp_smarthost: 'server.corpX.un:25'
      smtp_from: 'alertmanager@corpX.un'
      smtp_require_tls: false

    route:
      group_wait: 30s
      group_interval: 5m
      repeat_interval: 3h
      receiver: team-mails

    receivers:
    - name: 'team-mails'
      email_configs:
      - to: 'student@corpX.un'
        send_resolved: true
...
</code><code>
kube1:~/vm# helm upgrade -i vma vm/victoria-metrics-alert -f vm-alert-values.yaml -n vm

kube1:~/vm# kubectl -n vm exec -ti pods/vma-victoria-metrics-alert-server-<TAB> -- sh
</code><code>
/ # cat /config/alert-rules.yaml
...
</code><code>
cmder> kubectl -n vm port-forward svc/vma-victoria-metrics-alert-server 8880

kube1:~/vm# kubectl -n vm exec -ti pods/vma-victoria-metrics-alert-alertmanager-<TAB> -- sh
</code><code>
/alertmanager $ cat /config/alertmanager.yaml
...
</code><code>
cmder> kubectl -n vm port-forward svc/vma-victoria-metrics-alert-alertmanager 9093
</code>

  * Используем [[Система Kubernetes#Базовые объекты k8s]] для стресс тестирования из [[Основы администрирования систем Linux#Модуль 11. Анализ производительности и оптимизация системы]]
  * [[Команда dd]] для нехватки места на диске

===== Журналы =====

  * [[https://docs.victoriametrics.com/helm/victorialogs-single/]]
  * [[https://docs.victoriametrics.com/victorialogs/logsql-examples/]] 

<code>
kube1:~/vm# helm show values vm/victoria-logs-single > vls-values.yaml

kube1:~/vm# cat vls-values.yaml
</code><code>
...
vector:
...
  enabled: true
...
</code><code>
kube1:~/vm# helm upgrade -i vls oci://ghcr.io/victoriametrics/helm-charts/victoria-logs-single -f vls-values.yaml -n vm

cmder$ kubectl port-forward svc/vls-victoria-logs-single-server 9428 -n vm

VMUI-> Log Query: kubernetes.pod_name: my-debian
</code>

==== Подключение Grafana ====

<code>
Grafana -> Connections ->
Add new connection: VictoriaLogs -> 

Install -> New Datasources
http://vls-victoria-logs-single-server:9428 -> 

Explore -> LogQL: _time:5m

Builder-> Filter: kubernetes.pod_name = my-debian
</code>

====== Черновик ======

<code>
        - alert: CriticalCPU
          expr: sum by (kubernetes_io_hostname) (rate (container_cpu_usage_seconds_total[1m])) / sum (machine_cpu_cores) * 100 > 40
          for: 1m
          labels:
            severity: "critical"
          annotations:
            summary: "CriticalCPU {{ $labels.instance }}"

        - alert: CriticalFS
          expr: container_fs_usage_bytes{device=~"^/dev/[sv]d[a-z][1-9]$"} / container_fs_limit_bytes * 100 > 80
          for: 1m
          labels:
            severity: "critical"
          annotations:
            summary: "CriticalFS {{ $labels.instance }}"

        - alert: CriticalMEM
          expr: sum by (kubernetes_io_hostname) (container_memory_working_set_bytes) / sum (machine_memory_bytes) * 100 > 80
          for: 1m
          labels:
            severity: "critical"
          annotations:
            summary: "CriticalMEM {{ $labels.instance }}"
</code>
Методические материалы Лохтурова Вячеслава

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