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Create fake /etc/hosts for conformance test

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"KubeletManagedEtcHosts should test kubelet managed /etc/hosts file"
conformance test fails in the CI's Docker-In-Docker environment.

This test mounts a /etc/hosts file and checks if "# Kubernetes-managed
hosts file." string is present or not under various conditions. The
specific failure with DIND happens when the /etc/hosts picked up
from the box where e2e test are running already has this string. This
happens because our CI runs on kubernetes and the e2e tests are running
in a container that was started on kubernetes (and hence already has
that string)

To avoid this situation, we create a new /etc/hosts file with known
contents (and does not have the "# Kubernetes-managed hosts file."
string)
This commit is contained in:
Davanum Srinivas 2018-03-01 07:26:00 +00:00
parent 7e98a3ad7c
commit ba20e63446
1 changed files with 32 additions and 1 deletions
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33
test/e2e/common/kubelet_etc_hosts.go
View File

@ -17,6 +17,8 @@ limitations under the License.
package common
import (
"io/ioutil"
"os"
"strings"
"time"
@ -40,6 +42,7 @@ type KubeletManagedHostConfig struct {
hostNetworkPod *v1.Pod
pod *v1.Pod
f *framework.Framework
tmpEtcHostFile *os.File
}
var _ = framework.KubeDescribe("KubeletManagedEtcHosts", func() {
@ -59,6 +62,8 @@ var _ = framework.KubeDescribe("KubeletManagedEtcHosts", func() {
By("Running the test")
config.verifyEtcHosts()
config.cleanup()
})
})
@ -76,6 +81,26 @@ func (config *KubeletManagedHostConfig) verifyEtcHosts() {
}
func (config *KubeletManagedHostConfig) setup() {
etcHostContents := `127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters`
// Write the data to a temp file.
var err error
config.tmpEtcHostFile, err = ioutil.TempFile("", "etc-hosts")
if err != nil {
framework.Failf("failed to create temp file for /etc/hosts: %v", err)
}
if _, err := config.tmpEtcHostFile.Write([]byte(etcHostContents)); err != nil {
framework.Failf("Failed to write temp file for /etc/hosts data: %v", err)
}
if err := config.tmpEtcHostFile.Close(); err != nil {
framework.Failf("Failed to close temp file: %v", err)
}
By("Creating hostNetwork=false pod")
config.createPodWithoutHostNetwork()
@ -83,6 +108,12 @@ func (config *KubeletManagedHostConfig) setup() {
config.createPodWithHostNetwork()
}
func (config *KubeletManagedHostConfig) cleanup() {
if config.tmpEtcHostFile != nil {
os.Remove(config.tmpEtcHostFile.Name())
}
}
func (config *KubeletManagedHostConfig) createPodWithoutHostNetwork() {
podSpec := config.createPodSpec(etcHostsPodName)
config.pod = config.f.PodClient().CreateSync(podSpec)
@ -184,7 +215,7 @@ func (config *KubeletManagedHostConfig) createPodSpec(podName string) *v1.Pod {
Name: "host-etc-hosts",
VolumeSource: v1.VolumeSource{
HostPath: &v1.HostPathVolumeSource{
Path: "/etc/hosts",
Path: config.tmpEtcHostFile.Name(),
Type: hostPathType,
},
},