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have you looked at

journalctl -u k3s

on additional nodes that you are trying to join?

Hi @hundreds-evening-84071, Sure, here are the logs from one of the nodes that should be an additional master node in the cluster:

: desc = \"transport: Error while dialing dial tcp 10.154.146.193:2379: connect: no route to host\""}
ERRO[0023] Failed to get member list from etcd cluster. Will assume this member is already added
INFO[0023] Starting etcd to join cluster with members [node1.example.net-e0ce15fe=<https://10.154.146.193:2380> node3.example.net-f5c8229b=<https://10.158.146.17:2380>]
{"level":"info","ts":"2023-04-03T07:49:14.530+0200","caller":"embed/etcd.go:124","msg":"configuring peer listeners","listen-peer-urls":["<https://10.158.146.17:2380>","<https://127.0.0.1:2380>"]}
{"level":"info","ts":"2023-04-03T07:49:14.530+0200","caller":"embed/etcd.go:482","msg":"starting with peer TLS","tls-info":"cert = /var/lib/rancher/k3s/server/tls/etcd/peer-server-client.crt, key = /var/lib/rancher/k3s/server/tls/etcd/peer-server-client.key, client-cert=, client-key=, trusted-ca = /var/lib/rancher/k3s/server/tls/etcd/peer-ca.crt, client-cert-auth = true, crl-file = ","cipher-suites":[]}
{"level":"info","ts":"2023-04-03T07:49:14.530+0200","caller":"embed/etcd.go:132","msg":"configuring client listeners","listen-client-urls":["<https://10.158.146.17:2379>","<https://127.0.0.1:2379>"]}
{"level":"info","ts":"2023-04-03T07:49:14.531+0200","caller":"embed/etcd.go:306","msg":"starting an etcd server","etcd-version":"3.5.5","git-sha":"Not provided (use ./build instead of go build)","go-version":"go1.19.6","go-os":"linux","go-arch":"amd64","max-cpu-set":4,"max-cpu-available":4,"member-initialized":false,"name":"node3.example.net-f5c8229b","data-dir":"/var/lib/rancher/k3s/server/db/etcd","wal-dir":"","wal-dir-dedicated":"","member-dir":"/var/lib/rancher/k3s/server/db/etcd/member","force-new-cluster":false,"heartbeat-interval":"500ms","election-timeout":"5s","initial-election-tick-advance":true,"snapshot-count":10000,"snapshot-catchup-entries":5000,"initial-advertise-peer-urls":["<http://localhost:2380>"],"listen-peer-urls":["<https://10.158.146.17:2380>","<https://127.0.0.1:2380>"],"advertise-client-urls":["<https://10.158.146.17:2379>"],"listen-client-urls":["<https://10.158.146.17:2379>","<https://127.0.0.1:2379>"],"listen-metrics-urls":["<http://127.0.0.1:2381>"],"cors":["*"],"host-whitelist":["*"],"initial-cluster":"node1.example.net-e0ce15fe=<https://10.154.146.193:2380>,node3.example.net-f5c8229b=<https://10.158.146.17:2380>","initial-cluster-state":"existing","initial-cluster-token":"etcd-cluster","quota-backend-bytes":2147483648,"max-request-bytes":1572864,"max-concurrent-streams":4294967295,"pre-vote":true,"initial-corrupt-check":true,"corrupt-check-time-interval":"0s","compact-check-time-enabled":false,"compact-check-time-interval":"1m0s","auto-compaction-mode":"","auto-compaction-retention":"0s","auto-compaction-interval":"0s","discovery-url":"","discovery-proxy":"","downgrade-check-interval":"5s"}
{"level":"info","ts":"2023-04-03T07:49:14.532+0200","caller":"etcdserver/backend.go:81","msg":"opened backend db","path":"/var/lib/rancher/k3s/server/db/etcd/member/snap/db","took":"1.098286ms"}
INFO[0023] Waiting to retrieve kube-proxy configuration; server is not ready: <https://127.0.0.1:6443/v1-k3s/readyz>: 500 Internal Server Error
{"level":"warn","ts":"2023-04-03T07:49:14.536+0200","caller":"etcdserver/cluster_util.go:79","msg":"failed to get cluster response","address":"<https://10.154.146.193:2380/members>","error":"Get \"<https://10.154.146.193:2380/members>\": dial tcp 10.154.146.193:2380: connect: no route to host"}
{"level":"info","ts":"2023-04-03T07:49:14.544+0200","caller":"embed/etcd.go:371","msg":"closing etcd server","name":"node3.example.net-f5c8229b","data-dir":"/var/lib/rancher/k3s/server/db/etcd","advertise-peer-urls":["<http://localhost:2380>"],"advertise-client-urls":["<https://10.158.146.17:2379>"]}
{"level":"info","ts":"2023-04-03T07:49:14.545+0200","caller":"embed/etcd.go:373","msg":"closed etcd server","name":"node3.example.net-f5c8229b","data-dir":"/var/lib/rancher/k3s/server/db/etcd","advertise-peer-urls":["<http://localhost:2380>"],"advertise-client-urls":["<https://10.158.146.17:2379>"]}
FATA[0023] ETCD join failed: cannot fetch cluster info from peer urls: could not retrieve cluster information from the given URLs

Why don't you have a route to that host?

Thank you for your reply! Just to clarify, K3S doesn't create any rules that could block network traffic?

I've never seen anyone need to do that, no

So, currently have two K3S clusters: one with version v1.26 and another with v1.24. 1.26 is compatible with RHEL8.7, but somehow I can't add nodes to the master node, I get "*no route to host*". 1.24 is not compatible with RHEL8.7. However, I could successfully create a cluster with v1.24 and add nodes. But now the problem is that the actions-runner-controller can't access GHES:

"ERROR runner Failed to get new registration token {"runner": "github-actions-runner-small-001-f6qfz-49wvb", "error": "failed to create registration token: Post "<https://test-github.example.net/api/v3/orgs/myorg/actions/runners/registration-token/>": could not refresh installation id 5's token: could not get access_tokens from GitHub API for installation ID 5: dial tcp: lookup <http://test-github.example.net|test-github.example.net>: i/o timeout"}"

The same thing with cert-manager:

E0403 13:54:46.663175       1 reflector.go:140] <http://k8s.io/client-go@v0.26.0/tools/cache/reflector.go:169|k8s.io/client-go@v0.26.0/tools/cache/reflector.go:169>: Failed to watch *v1.Secret: failed to list *v1.Secret: Get "<https://10.43.0.1:443/api/v1/namespaces/cert-manager/secrets?fieldSelector=metadata.name%3Dcert-manager-webhook-ca&resourceVersion=49236>": dial tcp 10.43.0.1:443: i/o timeout

On version 1.26 cert-manager and ARC work fine, without any issues. The only problem there is that I can't add nodes to the cluster. iptables and firewalld are not installed.

somehow I can’t add nodes to the master node, I get “*no route to host*”.

I don’t think it has anything to do with the version. It has to do with the nodes you’re trying to add not being able to reach the node you’re trying to add them to

Thank you for your reply and help! The issue has been solved after the host restart. Most probably something was cached or stuck and thus I couldn't add nodes to the cluster...