apply cluster-config-full.yaml error, which show init-mysql container does not have hostname

[yin-zt]

[root@k8s-master mysql-operator]# k get pods
NAME READY STATUS RESTARTS AGE
my-cluster-0 0/2 Init:CrashLoopBackOff 6 7m59s
mysql-operator-fb994cd5c-h44mc 1/1 Running 0 28m
[root@k8s-master mysql-operator]# k logs -f my-cluster-0 -c init-mysql
++ hostname
bash: line 2: hostname: command not found

• [[ '' =~ -([0-9]+)$ ]]
• exit 1
  [root@k8s-master mysql-operator]# cat cluster-config_full.yaml
  apiVersion: cr.mysqloperator.grtl.github.com/v1
  kind: MySQLCluster
  metadata:
  name: "my-cluster"
  spec:
  secret: "my-secret" # Name of the secret containing the password
  port: 3306 # Port on which the service will expose the MySQL
  replicas: 2 # Number of replicas
  storage: "1Gi" # Persistance Volume Claim size for each replica
  image: "mysql:latest" # MySQL image
  [root@k8s-master mysql-operator]#