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ELK Beats/Loki Promtail Log Tidak Terbaca di Oracle Kubernetes Engine (OKE)

Konfigurasi default ELK/Loki stack adalah mengambil log dari docker container di pod yang terletak di tiap node di path /var/log/container/*.log. Namun di OKE file tersebut memang ada, tapi bukan file asli melainkan symbolic link ke file aslinya di /u01/data/docker/containers/*/.log

Sehingga pod daemonset tidak dapat mengakses file tersebut, solusinya adalah menambah volume mount /u01/data/docker/containers/*/.log ke pod daemonset Filebeats/Loki.

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Kubernetes Oracle (OCI) Tidak Bisa Autoscale Cluster/Node

Di dalam kubernetes ada beberapa jenis autoscale

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Horizontal pod autoscale, menambah instance pod (Scale out). Sedangkan Vertical pod autoscale memperbesar spesifiaksi pod (cpu/memory) (Scale up). Kedua pod scaling ini juga bisa digabung. Untuk menentukan apakah mau scale up atau scale down, metrik defaultnya adalah utilisasi CPU, namun bisa juga memakai metrik lain (namun tidak resmi disupport).

Ketika pod di scale, pod akan di recreate, mencari node yang ada sisa tempat untuk diletakan pod nya. Namun bagaimana jika semua node penuh? solusinya adalah menggunakan cluster/node autoscale (Dengan menambah node baru).

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