Is it possible to set a hostname in a Kubernetes replication controller?

Question

I need to set a static hostname in a Kubernetes replication controller. Docker supports it with some runtime flags, however, Kubernetes replication controllers don't appear to support it. The environment: OS - CentOS 6.6 Approach to use sysctl to change the variable kernel.hostname does not work for a K8s replication controller. The host name is not changed. Use: sysctl kernel.hostname to read the current hostname, and sysctl kernel.hostname=NEW_HOSTNAME

Is it possible to set a hostname in a Kubernetes replication controller?

Answer 1

In 1.7 you can set the hostname directly in the Deployment spec

spec:
  replicas: 1
  template:
    spec:
      hostname: myhostname
      containers:
        ...

Old Answer

Now that 1.2 has landed, you can set a static hostname in a Replication Controller or Deployment spec using the pod.beta.kubernetes.io/hostname annotation.

spec:
  replicas: 1
  template:
    metadata:
      annotations:
        pod.beta.kubernetes.io/hostname: myhostname
      labels:
        ...