Please don't drop the list from your responses, you'd benefit from more people reading it. The cephadm ls output isn't really helpful, you need to figure out why docker doesn't start. Either syslog, journald or dmesg or whatever should give some clue. And to me it sounds like there has been more going on beside the network outage, maybe some leftovers from previous deployments or tests or something else that "confuses" docker? Maybe you have both podman and docker installed and since cephadm prefers podman, the containers fail to start? Zitat von Jacek Rużyczka <jacek.ruzyczka@googlemail.com>:

I can't run the Ceph container on the master node (blade3n1) anymore. It's not executed anymore without an error message. Here is what cephadm ls says:

mixtile@blade3n1:~$ sudo cephadm ls [ { "style": "cephadm:v1", "name": "mon.blade3n1", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@mon.blade3n1" , "enabled": true, "state": "error", "service_name": "mon", "memory_request": null, "memory_limit": null, "ports": [], "container_id": null, "container_image_name": "quay.io/ceph/ceph:v19", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-16T14:35:47.634066Z", "deployed": "2026-04-16T14:35:45.414037Z", "configured": "2026-04-20T17:16:32.722329Z" }, { "style": "cephadm:v1", "name": "node-exporter.blade3n1", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@node-exporter .blade3n1", "enabled": true, "state": "error", "service_name": "node-exporter", "ports": [ 9100 ], "ip": null, "deployed_by": [ " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102 a753902f33ee16c26b6cee" ], "rank": null, "rank_generation": null, "extra_container_args": null, "extra_entrypoint_args": null, "memory_request": null, "memory_limit": null, "container_id": null, "container_image_name": "quay.io/prometheus/node-exporter:v1.7.0", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-21T12:55:39.731035Z", "deployed": "2026-04-21T12:55:38.217675Z", "configured": "2026-04-21T12:55:39.734369Z" }, { "style": "cephadm:v1", "name": "ceph-exporter.blade3n1", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@ceph-exporter .blade3n1", "enabled": true, "state": "error", "service_name": "ceph-exporter", "ports": [], "ip": null, "deployed_by": [ " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102 a753902f33ee16c26b6cee" ], "rank": null, "rank_generation": null, "extra_container_args": null, "extra_entrypoint_args": null, "memory_request": null, "memory_limit": null, "container_id": null, "container_image_name": " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe2 19dfc8d0c3efc1f05102a753902f33ee16c26b6cee", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-16T14:37:32.218782Z", "deployed": "2026-04-16T14:37:30.612094Z", "configured": "2026-04-20T17:16:36.139048Z" }, { "style": "cephadm:v1", "name": "mgr.blade3n1.rrlwwv", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@mgr.blade3n1. rrlwwv", "enabled": true, "state": "error", "service_name": "mgr", "memory_request": null, "memory_limit": null, "ports": [ 9283, 8765, 8443 ], "container_id": null, "container_image_name": "quay.io/ceph/ceph:v19", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-16T14:35:54.054151Z", "deployed": "2026-04-16T14:35:52.430796Z", "configured": "2026-04-20T17:16:37.612403Z" }, { "style": "cephadm:v1", "name": "crash.blade3n1", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@crash.blade3n 1", "enabled": true, "state": "error", "service_name": "crash", "ports": [], "ip": null, "deployed_by": [ " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102 a753902f33ee16c26b6cee" ], "rank": null, "rank_generation": null, "extra_container_args": null, "extra_entrypoint_args": null, "memory_request": null, "memory_limit": null, "container_id": null, "container_image_name": " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe2 19dfc8d0c3efc1f05102a753902f33ee16c26b6cee", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-16T14:37:36.855510Z", "deployed": "2026-04-16T14:37:35.268822Z", "configured": "2026-04-20T17:16:39.025758Z" }, { "style": "cephadm:v1", "name": "osd.3", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@osd.3", "enabled": true, "state": "error", "service_name": "osd", "ports": [], "ip": null, "deployed_by": [ " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102 a753902f33ee16c26b6cee" ], "rank": null, "rank_generation": null, "extra_container_args": null, "extra_entrypoint_args": null, "memory_request": null, "memory_limit": null, "container_id": null, "container_image_name": " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe2 19dfc8d0c3efc1f05102a753902f33ee16c26b6cee", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-23T15:05:00.686688Z", "deployed": "2026-04-23T15:04:59.176667Z", "configured": "2026-04-23T15:05:00.693355Z" }, { "style": "cephadm:v1", "name": "mds.data.blade3n1.eczeqc", "fsid": "8aad3073-39a1-11f1-bf6e-f2704a1efa9b", "systemd_unit": "ceph-8aad3073-39a1-11f1-bf6e-f2704a1efa9b@mds.data.blad e3n1.eczeqc", "enabled": true, "state": "error", "service_name": "mds.data", "ports": [], "ip": null, "deployed_by": [ " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102 a753902f33ee16c26b6cee" ], "rank": null, "rank_generation": null, "extra_container_args": null, "extra_entrypoint_args": null, "memory_request": null, "memory_limit": null, "container_id": null, "container_image_name": " quay.io/ceph/ceph@sha256:af0c5903e901e329adabe2 19dfc8d0c3efc1f05102a753902f33ee16c26b6cee", "container_image_id": null, "container_image_digests": null, "version": null, "started": null, "created": "2026-04-16T15:54:13.264224Z", "deployed": "2026-04-16T15:54:10.870858Z", "configured": "2026-04-20T17:16:40.499113Z" } ]

Am Mi., 27. Mai 2026 um 15:07 Uhr schrieb Jacek Rużyczka < jacek.ruzyczka@googlemail.com>:

...

Hi Eugen,

You might need to run 'systemctl reset-failed...' to let systemd start the

...

containers.

I've already done that. No use. Even worse: On node #1, Docker no longer starts. When trying to restart the daemon, I get errors like this:

docker.service: Failed with result 'core-dump'.

But before you do that, do you have MON logs with an explanation why they

...

refuse to start?

Unfortunately no, not even in the syslog. In the meantime, I was able to start another MON via Cephadm (because the Docker instance had even deleted the image), but now I've got the problem with the one node, where Docker refuses to start.

Regarding Ceph images, your cluster uses af0c5903e901 for the Ceph

...

services, what does 'docker images | grep af0c5903e901' show?

On the affected node, nothing 'cause the Docker daemon wouldn't even start.

I have the impression that this is a "regular" cephadm cluster

True

BTW, when running the test script supplied by the Docker guys https://docs.docker.com/engine/daemon/troubleshoot/, I get some warnings:

- Network Drivers: - "bridge": - sysctl net.ipv4.ip_forward: disabled - sysctl net.ipv6.conf.all.forwarding: disabled - sysctl net.ipv6.conf.default.forwarding: disabled

On nodes #2 thru #4, net.ipv4.ip_forward is enabled.

Regards Jacek Rużyczka