Workspace fails to start with DNS configuration issue

Describe the bug

When starting up any workspace, I get the following message:

Starting Init Plugin Broker
Cleaning /plugins dir
Unified Che Plugin Broker
List of plugins and editors to install
- che-incubator/typescript/latest - Typescript language features
- eclipse/che-machine-exec-plugin/0.0.1 - Che Plug-in with che-machine-exec service to provide creation terminal or tasks for Eclipse CHE workspace machines.
- eclipse/che-theia/7.0.0-next - Eclipse Theia, get the latest release each day.
Starting Che plugins and editor processing
Starting VS Code and Theia plugins processing
Downloading VS Code extension for plugin 'che-incubator/typescript/latest'
Get https://github.com/che-incubator/ms-code.typescript/releases/download/v1.35.1/che-typescript-language-1.35.1.vsix: x509: certificate is valid for <myDomain>, not github.com
Error: Failed to run the workspace: "Plugins installation process failed. Error: Plugin broking process for workspace workspacetmujzgxq3e83ylyx failed with error: Get https://github.com/che-incubator/ms-code.typescript/releases/download/v1.35.1/che-typescript-language-1.35.1.vsix: x509: certificate is valid for <myDomain>, not github.com"

Che version

• latest
• nightly
• other: please specify

7.0.0-rc-5.0-SNAPSHOT

Steps to reproduce

1. Deploy che using either of the following:

• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s --tls --self-signed-cert
• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s --tls or;
• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s

1. Create an organization
2. Create & startup any workspace

Expected behavior

Runtime

• kubernetes (include output of kubectl version)
• Openshift (include output of oc version)
• minikube (include output of minikube version and kubectl version)
• minishift (include output of minishift version and oc version)
• docker-desktop + K8S (include output of docker version and kubectl version)
• other: (please specify)

Screenshots

Installation method

• chectl
• che-operator
• minishift-addon
• I don’t know

chectl/0.0.2-a74ad81 linux-x64 node-v10.4.1

Environment

• my computer
  • Windows
  • Linux
  • macOS
• Cloud
  • Amazon
  • Azure
  • GCE
  • other (please specify)
• other: please specify

private cloud hosted by ubuntu server

Additional context

Looks relevant to https://github.com/eclipse/che/issues/12999 & https://github.com/eclipse/che/issues/13685 maybe?

[SDAdham]

This issue has been resolved, the whole issue was actually produced by maas where when it would compose new machine, it will automatically add search into the DNS settings. Removing those search values from the DNS configuration helped resolving the issue immediately and now that the DNS is stable.

Bug has been reported to the MAAS team https://bugs.launchpad.net/maas/+bug/1841334

Thanks everyone!

[skryzhny]

I doubt it related to che, more like infrastructure or DNS problem. Can you do curl like curl -v https://github.com/ from workspace pod?