🐬 💪🏾 🏂🏼 Correct pod shutdown in Kubernetes cluster 🔷 🍆 🤶🏻

Proper container shutdown in Kubernetes

(. . — ) Kubernetes-. , drain . , : pod’.

pod’

kubectl drain pod’ . , :

drain pod’ control plane. kubelet , pod’.
kubelet pod’ preStop
preStop , kubelet TERM pod’.
kubelet ( pod’, ; 30 ) , ( SIGKILL). preStop .

, preStop , “ ” . , , , TERM, , , , . , , TERM (, - ), preStop API, .

Nginx TERM, . preStop . resource lifecycle . lifecycle :

lifecycle:
 preStop:
   exec:
     command: [
       # Gracefully shutdown nginx
       "/usr/sbin/nginx", "-s", "quit"
     ]

, , SIGTERM Nginx /usr/sbin/nginx -s quit. , , Nginx pod, TERM noop ( — .).

Nginx. , Deployment :

---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: nginx-deployment
 labels:
   app: nginx
spec:
 replicas: 2
 selector:
   matchLabels:
     app: nginx
 template:
   metadata:
     labels:
       app: nginx
   spec:
     containers:
     - name: nginx
       image: nginx:1.15
       ports:
       - containerPort: 80
       lifecycle:
         preStop:
           exec:
             command: [
               # Gracefully shutdown nginx
               "/usr/sbin/nginx", "-s", "quit"
             ]