Ta yaya upstreams na Nginx suke raba zirga-zirga da kula da nodes masu matsala?

Question

IT Interview Practice · Accepted Answer

Ƙirƙiri upstream group don Nginx ya iya aika buƙatu zuwa instances na manhaja da yawa. Sannan ka yanke shawarar yadda za a raba aiki da lokacin da za a guji instance mai matsala na ɗan lokaci.

## Fara da sabobin manhaja biyu

Cikin `http`, configuration ɗin misali mai zuwa yana raba zirga-zirga zuwa adireshin sirri biyu:

```nginx
upstream app {
    server 10.0.0.11:3000 max_fails=2 fail_timeout=10s;
    server 10.0.0.12:3000 max_fails=2 fail_timeout=10s;
}
server {
    listen 80;
    location / {
        proxy_pass http://app;
    }
}
```

Idan nauyi ɗaya ne, hanyar round-robin ta tsoho tana bi da sabobin bi da bi. `max_fails` da `fail_timeout` na misalin suna sa kurakuran da suka dace su ware sabar na ɗan lokaci. Lambobin suna nuna halayya ne; zaɓi ƙimar production daga zirga-zirgarka da juriyar matsala.

## Yaushe za ka canja hanyar?

Idan wasu buƙatu suna riƙe haɗe-haɗe na dogon lokaci, yi la'akari da ƙara `least_conn;` cikin upstream block. Tana fifita ƙarancin haɗe-haɗe masu aiki. Babu hanyar da ke raba bayanan session: idan login sessions suna kan instance ɗaya, matsar da su zuwa shared storage ko ka tsara session affinity da gangan.

## Gwada matsala maimakon ɗaukar cewa za a farfaɗo

Dakatar da instance na gwaji ɗaya ka binciki upstream ɗin da ke karɓar buƙatu. Passive failure detection tana koyo daga buƙatu na gaske; health probes na lokaci-lokaci sun dogara da fasalolin da ake da su. Iyakance retries kuma kada ka maimaita biyan kuɗi mai sakamako marar tabbas a makance: ƙoƙarin farko wataƙila ya riga ya yi nasara.

[Takardun hukuma](https://nginx.org/en/docs/http/ngx_http_upstream_module.html).

Fara da sabobin manhaja biyu

Yaushe za ka canja hanyar?

Gwada matsala maimakon ɗaukar cewa za a farfaɗo

Tambayoyi masu alaƙa