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Description of problem: When SSH'ing to an RHCOS host on Azure, the connection times out if it's left idle for too long (about five minutes). Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Create host on Azure 2. SSH to host 3. Wait five minutes Actual results: Connection hangs and must be terminated. Expected results: Connection is kept alive. Additional info: The SSHD configuration disables the ClientAliveInterval. It should be set to 180. Steven Zarkos (MSFT engineer) told me that value years ago and we use that in Container Linux. Making that change in RHCOS also fixes the issue.
Verified changes are present in RHCOS using 4.2.0-0.nightly-2019-06-30-221852 ``` $ oc get clusterversion NAME VERSION AVAILABLE PROGRESSING SINCE STATUS version 4.2.0-0.nightly-2019-06-30-221852 True False 3m14s Cluster version is 4.2.0-0.nightly-2019-06-30-221852 [miabbott@mastershake (container) ~/openshift-cluster-installs/4.2.0-0.nightly-2019-06-30-221852 ]$ oc get nodes NAME STATUS ROLES AGE VERSION ip-10-0-139-116.us-west-2.compute.internal Ready worker 12m v1.14.0+04ae0f405 ip-10-0-141-177.us-west-2.compute.internal Ready master 21m v1.14.0+04ae0f405 ip-10-0-150-236.us-west-2.compute.internal Ready worker 12m v1.14.0+04ae0f405 ip-10-0-151-141.us-west-2.compute.internal Ready master 21m v1.14.0+04ae0f405 ip-10-0-163-151.us-west-2.compute.internal Ready worker 12m v1.14.0+04ae0f405 ip-10-0-167-205.us-west-2.compute.internal Ready master 21m v1.14.0+04ae0f405 [miabbott@mastershake (container) ~/openshift-cluster-installs/4.2.0-0.nightly-2019-06-30-221852 ]$ oc debug node/ip-10-0-139-116.us-west-2.compute.internal Starting pod/ip-10-0-139-116us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` If you don't see a command prompt, try pressing enter. sh-4.2# chroot /host sh-4.4# rpm-ostree status State: idle AutomaticUpdates: disabled Deployments: * pivot://quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:66e8bca50ff16c7082425b8f42578b69f1d28b08fe62d359451132a3e837735d CustomOrigin: Managed by pivot tool Version: 420.8.20190630.0 (2019-06-30T20:53:07Z) pivot://quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:dd3bd07c9a4fd39d8039b137fa161c3a5b38a2855e8df9f6c16946ccdf7b3f31 CustomOrigin: Provisioned from oscontainer Version: 420.8.20190624.0 (2019-06-24T00:25:32Z) sh-4.4# grep ClientAlive /etc/ssh/sshd_config ClientAliveInterval 180 #ClientAliveCountMax 3 ```
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:2922