I'm trying to 'push' entries into a containers /etc/hosts file by using the 'hostAliases' element of a Pod when defining a Replication Controller.
This is the Replication Controller definition:
{
"kind": "ReplicationController",
"apiVersion": "v1",
"metadata": {
"name": "my-test",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/replicationcontrollers/my-test",
"uid": "1f80363b-5a1d-11e8-b352-08002725d524",
"resourceVersion": "70872",
"generation": 1,
"creationTimestamp": "2018-05-17T21:56:16Z",
"labels": {
"name": "my-test"
}
},
"spec": {
"replicas": 2,
"selector": {
"name": "my-test"
},
"template": {
"metadata": {
"creationTimestamp": null,
"labels": {
"name": "my-test"
}
},
"spec": {
"containers": [
{
"name": "cont0",
"image": "192.168.97.10:5000/test_img:kubes",
"command": [
"/usr/local/bin/php"
],
"args": [
"/opt/code/myscript.php",
"myarg"
],
"resources": {},
"terminationMessagePath": "/dev/termination-log",
"terminationMessagePolicy": "File",
"imagePullPolicy": "IfNotPresent"
}
],
"hostAliases": [
{
"ip": "10.0.2.2",
"hostnames": [ "mylaptop"],
}
],
"restartPolicy": "Always",
"terminationGracePeriodSeconds": 30,
"dnsPolicy": "ClusterFirst",
"securityContext": {},
"schedulerName": "default-scheduler"
}
}
},
"status": {
"replicas": 2,
"fullyLabeledReplicas": 2,
"observedGeneration": 1
}
}
However the hostAliases just seems to be ignored...
Any pointers on whether this is supported, and if not, any alternative methods of achieving the same?
I hope this is the solution, as I quickly verified it and it worked. I created a simple nginx deployment and then edited it to add the hostAliases entry:
With below snippet, I was getting an error and could not save the deployment
"hostAliases": [
{
"ip": "10.0.2.2",
"hostnames": [ "mylaptop"],
}
],
The problem is that comma , after the [ "mylaptop"] - once I removed it and then saved deployment:
"hostAliases": [
{
"ip": "10.0.2.2",
"hostnames": [ "mylaptop"]
}
],
I could see entry in the hosts file:
$kubectl exec -i -t nginx-5f6bbbdf97-m6d92 -- sh
#
#
# cat /etc/hosts
# Kubernetes-managed hosts file.
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
fe00::0 ip6-mcastprefix
fe00::1 ip6-allnodes
fe00::2 ip6-allrouters
10.8.4.147 nginx-5f6bbbdf97-m6d92
# Entries added by HostAliases.
10.0.2.2 mylaptop