Description
What happened:
I'm trying to automate the usage of kubectl diff to check for changes that need to be applied to the cluster based on a static set of manifests.
However, for some manifests, if I run kubectl diff the output contains differences on fields called time and date, after the manifest was applied to the cluster.
I ran kubectl apply -f https://cloud.weave.works/k8s/v1.18/net.yaml.
After that, I ran kubectl diff -f https://cloud.weave.works/k8s/v1.18/net.yaml
The following output was produced (I copied just the first diff, as many more followed):
diff -u -N /tmp/LIVE-185931702/apps.v1.DaemonSet.kube-system.weave-net /tmp/MERGED-226760605/apps.v1.DaemonSet.kube-system.weave-net
--- /tmp/LIVE-185931702/apps.v1.DaemonSet.kube-system.weave-net 2020-08-20 01:02:52.435371952 +0000
+++ /tmp/MERGED-226760605/apps.v1.DaemonSet.kube-system.weave-net 2020-08-20 01:02:52.451372598 +0000
@@ -6,7 +6,7 @@
{
"original-request": {
"url": "/k8s/v1.16/net.yaml",
- "date": "Thu Aug 20 2020 01:02:44 GMT+0000 (UTC)"
+ "date": "Thu Aug 20 2020 01:02:50 GMT+0000 (UTC)"
},
"email-address": "[email protected]"
}
@@ -231,7 +231,7 @@
f:type: {}
manager: kubectl
operation: Update
- time: "2020-08-20T01:02:44Z"
+ time: "2020-08-20T01:02:52Z"
name: weave-net
namespace: kube-system
resourceVersion: "134873"
What you expected to happen:
No differences should be detected.
How to reproduce it (as minimally and precisely as possible):
Run kubectl apply -f https://cloud.weave.works/k8s/v1.18/net.yaml
Then run kubectl diff -f https://cloud.weave.works/k8s/v1.18/net.yaml
Anything else we need to know?:
This does not happen to all manifests.
If I try with the manifest https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml no differences are detected.
I also tried with manifests loaded from disk, and was able to reproduce the behavior with the following manifest:
apiVersion: v1
kind: LimitRange
metadata:
name: default-limit-range
spec:
limits:
- default:
cpu: 1
memory: 2Gi
defaultRequest:
cpu: 0.5
memory: 1Gi
max:
memory: 8Gi
type: ContainerWith the above manifest the following occurs:
# kubectl diff -f test.yaml
diff -u -N /tmp/LIVE-129755485/v1.LimitRange.default.default-limit-range /tmp/MERGED-076660504/v1.LimitRange.default.default-limit-range
--- /tmp/LIVE-129755485/v1.LimitRange.default.default-limit-range 2020-08-20 01:07:43.195113076 +0000
+++ /tmp/MERGED-076660504/v1.LimitRange.default.default-limit-range 2020-08-20 01:07:43.199113237 +0000
@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: LimitRange
+metadata:
+ creationTimestamp: "2020-08-20T01:07:43Z"
+ managedFields:
+ - apiVersion: v1
+ fieldsType: FieldsV1
+ fieldsV1:
+ f:spec:
+ f:limits: {}
+ manager: kubectl
+ operation: Update
+ time: "2020-08-20T01:07:43Z"
+ name: default-limit-range
+ namespace: default
+ selfLink: /api/v1/namespaces/default/limitranges/default-limit-range
+ uid: 42383e29-013b-43a3-a155-15c851e34bfb
+spec:
+ limits:
+ - default:
+ cpu: "1"
+ memory: 2Gi
+ defaultRequest:
+ cpu: 500m
+ memory: 1Gi
+ max:
+ memory: 8Gi
+ type: Container
# kubectl apply -f test.yaml
limitrange/default-limit-range created
# kubectl diff -f test.yaml
diff -u -N /tmp/LIVE-761467746/v1.LimitRange.default.default-limit-range /tmp/MERGED-905026905/v1.LimitRange.default.default-limit-range
--- /tmp/LIVE-761467746/v1.LimitRange.default.default-limit-range 2020-08-20 01:07:51.759458923 +0000
+++ /tmp/MERGED-905026905/v1.LimitRange.default.default-limit-range 2020-08-20 01:07:51.763459084 +0000
@@ -17,7 +17,7 @@
f:limits: {}
manager: kubectl
operation: Update
- time: "2020-08-20T01:07:49Z"
+ time: "2020-08-20T01:07:51Z"
name: default-limit-range
namespace: default
resourceVersion: "135599"
Empirically, the differences observed always seem to be some seconds apart between the two versions.
Environment:
- Kubernetes version (use
kubectl version):
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.8", GitCommit:"9f2892aab98fe339f3bd70e3c470144299398ace", GitTreeState:"clean", BuildDate:"2020-08-13T16:12:48Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.8", GitCommit:"9f2892aab98fe339f3bd70e3c470144299398ace", GitTreeState:"clean", BuildDate:"2020-08-13T16:04:18Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}
-
Cloud provider or hardware configuration: baremetal
-
OS (e.g:
cat /etc/os-release):
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.1 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
- Kernel (e.g.
uname -a):Linux pluto-next 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux - Install tools:
- Network plugin and version (if this is a network-related bug):
- Others: