Pod Ubuntu

Установим pod с пустой Ubuntu:latest

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: cam-ubuntu
  namespace: default
  labels:
    environment: test
    app: ubuntu
  annotations:
    author: cameda
spec:
  containers:
  - name: ubuntu
    image: ubuntu:latest
    command: ["/bin/sleep", "3650d"]
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

Проверим статус данного пода:

kubectl get pods -A -l environment=test
NAMESPACE   NAME         READY   STATUS    RESTARTS   AGE
default     cam-ubuntu   1/1     Running   0          48s

Посмотрим describe пода:

kubectl describe po cam-ubuntu
Error from server (NotFound): pods "am-ubuntu" not found
cameda-osx:~ cameda$ kubectl describe po cam-ubuntu
Name:         cam-ubuntu
Namespace:    default
Priority:     0
Node:         cl1r12kvg8q3mf91ohla-usen/10.128.0.29
Start Time:   Mon, 12 Sep 2022 12:52:38 +0300
Labels:       app=ubuntu
              environment=test
Annotations:  cni.projectcalico.org/podIP: 10.96.128.10/32
              kubernetes.io/limit-ranger: LimitRanger plugin set: cpu, memory request for container ubuntu; cpu, memory limit for container ubuntu
Status:       Running
IP:           10.96.128.10
IPs:
  IP:  10.96.128.10
Containers:
  ubuntu:
    Container ID:  containerd://f828c4feafc4af60ea82ca4703ab911d27f0ccdb86b24b2f9cb99555be75a2ad
    Image:         ubuntu:latest
    Image ID:      docker.io/library/ubuntu@sha256:20fa2d7bb4de7723f542be5923b06c4d704370f0390e4ae9e1c833c8785644c1
    Port:          <none>
    Host Port:     <none>
    Command:
      /bin/sleep
      3650d
    State:          Running
      Started:      Mon, 12 Sep 2022 12:52:39 +0300
    Ready:          True
    Restart Count:  0
    Limits:
      cpu:     500m
      memory:  500Mi
    Requests:
      cpu:        500m
      memory:     500Mi
    Environment:  <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-rwkg6 (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  kube-api-access-rwkg6:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   Guaranteed
Node-Selectors:              <none>
Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  2m6s  default-scheduler  Successfully assigned default/cam-ubuntu to cl1r12kvg8q3mf91ohla-usen
  Normal  Pulled     2m5s  kubelet            Container image "ubuntu:latest" already present on machine
  Normal  Created    2m5s  kubelet            Created container ubuntu
  Normal  Started    2m5s  kubelet            Started container ubuntu

Подключимся к поду:

kubectl exec --stdin --tty cam-ubuntu -- /bin/bash

Посмотрим логи пода и потребляемые ресурсы:

kubectl top pod cam-ubuntu --containers 
kubectl logs cam-ubuntu

Установка программ и просмотр информации:

apt-get -y update
apt-get -y install dnsutils
apt-get -y install iputils-ping
apt -y install htop mc traceroute strace
apt-get -y install postgresql
uname -a
hostname

ping ya.ru
PING ya.ru (87.250.250.242) 56(84) bytes of data.
64 bytes from ya.ru (87.250.250.242): icmp_seq=1 ttl=57 time=0.623 ms

dig ya.ru

; <<>> DiG 9.18.1-1ubuntu1.1-Ubuntu <<>> ya.ru
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20704
;; flags: qr ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 4d3e68213979872b (echoed)
;; QUESTION SECTION:
;ya.ru.				IN	A

;; ANSWER SECTION:
ya.ru.			30	IN	A	87.250.250.242

;; AUTHORITY SECTION:
ya.ru.			30	IN	NS	ns2.yandex.ru.
ya.ru.			30	IN	NS	ns1.yandex.ru.

;; Query time: 4 msec
;; SERVER: 10.112.128.2#53(10.112.128.2) (UDP)
;; WHEN: Mon Sep 12 10:15:46 UTC 2022
;; MSG SIZE  rcvd: 131

Всё работает!