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Solution

  1. The specifications are as follows:
apiVersion: v1
kind: Pod
metadata:
  name: vote-ui
spec:
  containers:
    - image: voting/vote-ui:latest
      name: vote-ui
  1. The application can be launched with the following command:
kubectl apply -f votingapp
If a folder is specified, all the YAML files in that directory are created
  1. What do you notice ?

Some Pods are in error:

$ kubectl get po
NAME        READY   STATUS             RESTARTS     AGE
db          1/1     Running            0            25s
redis       1/1     Running            0            25s
result      1/1     Running            0            25s
result-ui   0/1     CrashLoopBackOff   1 (4s ago)   24s
vote        1/1     Running            0            25s
vote-ui     0/1     CrashLoopBackOff   1 (3s ago)   25s
worker      1/1     Running            0            25s

If we take the vote-ui Pod as an example, the logs show that it cannot connect to vote:

$ kubectl logs vote-ui  
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2024/02/08 11:10:20 [emerg] 1#1: host not found in upstream "vote" in /etc/nginx/nginx.conf:44
nginx: [emerg] host not found in upstream "vote" in /etc/nginx/nginx.conf:44

Moreover, the logs from the worker Pod indicate that it cannot connect to the Redis Pod:

$ kubectl logs worker
...
Waiting for Redis dial tcp: lookup redis on 10.96.0.10:53: no such host

The Pods for the different microservices are created, but they cannot communicate with each other because we need to create Services. We will add this in the next step, which will allow us to have a fully functional application.

  1. We delete the application with the following command:
kubectl delete -f votingapp