The chart also sets by default a soft Pod AntiAffinity to reduce the risk of the cluster failing disastrously. Removing a failed etcd node Before you add a new etcd node, remove the failed one. Thus you see has already been bootstrapped. Paper with potentially inappropriately-ordered authors, should a journal act? Sign in This ensures the service is stopped. Thanks for the details. A machine participates etcd cluster A. Bright Cluster Manager will automatically re-create the config + certificates in case we do not back it up. When scaling down, a pre-stop lifecycle hook is used to ensure that the etcdctl member remove command is executed. Procedure From an active etcd host, remove the failed etcd node: Has there ever been a C compiler where using ++i was faster than i++? It uses distributed configuration stores like etcd, Consul, ZooKeeper or Kubernetes for maximum accessibility. etcdmain: member 4a77989596e4f4e2 has already been bootstrapped, docker: layers from manifest don't match image configuration. sudo docker ps, 189f88bb2b0f rancher/coreos-etcd:v3.3.10-rancher1 "/usr/local/bin/etcd" 10 months ago Up About a minute etcd, check container status The documents suggest that it's initial-cluster-state=existing. This implies that the cluster can be scaled up/down without human intervention. Create new master hosts. Metadata: In etcd terminology a node is also often referred to as a member. It will be closed after 21 days if no further activity occurs. Problem for me was I could not start node no1. If an operator is expected to make the right choice manually, we can design tools to do this automatically via the same logic flow. Reddit, Inc. 2023. If you lost your data dir, you have to. I'm attempting to setup a cluster on Ubuntu 18.04 host machines. privacy statement. See https://github.com/coreos/etcd/blob/master/Documentation/op-guide/clustering.md#static. Connect and share knowledge within a single location that is structured and easy to search. Remove member from etcd I think we should not encourage people to re-provision their machine for managing application (like k8s, etcd or ceph) purpose. Since user does not remove that machine from cluster A, now the machine belongs to both cluster A and B. This results in a restart once more, because the service is no longer started with the --initial-cluster-state=existing. The nodes which are being reused to create a new RKE cluster are causing the issue. Each of the bootstrapping mechanisms will be used to create a three machine etcd cluster with the following details: Static As we know the cluster members, their addresses and the size of the cluster before starting, we can use an offline bootstrap configuration by setting the initial-cluster flag. Reductive instead of oxidative based metabolism. SSH to one of the etcd members that are up and running and list all the members to get their identifiers. I upgraded from 3.3 to 3.4, I restore the dump from a single node, then restore to each node of the cluster, After startup, the log throws discovery failed","error":"member 15e5394f5ace5e93 has already been bootstrapped If not, we should stop expecting operators to do this, instead, etcd nodes should be provisioned/re-provisioned together without exception, if a re-provision is needed. The following article was written with Bright Cluster Manager 9.1 in mind but should work the same for versions 9.0 and 9.2. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. That should happen infrequently and should have human involved. We cannot. member 58720b382fc5f0b7 has already been bootstrapped if not set ETCD_INITIAL_CLUSTER_STATE="existing" how to rejoin to etcd cluster. Backing up etcds data to shared storage using different tools, such as rsync can in some cases be more practical. k8s etcd - ThreeCode - k8s etcd k8setcd etcd 1 2 3 4 5 6 7 8 9 10 11 [root@docker01 ~]# cd /opt/kubernetes/ssl/ [root@docker01 ssl]# /opt/kubernetes/bin/etcdctl \ > --ca-file=ca.pem --cert-file=server.pem --key-file=server-key.pem \ For details refer to this KB article. etcd failed to start after restarting mds after power failure, remove that member via dynamic configuration API. This is critical, since all the etcd replicas should be created simultaneously to guarantee they can find each other. It will wait until an updated Pod is Running and Ready prior to updating its predecessor. Once the pod is scheduled on another node and initialized, the etcd member is added again to the cluster using the. member 218d8bfb33a29c6 has already been bootstrapped One of the member was bootstrapped via discovery service. Once they finish, they can be promoted to a non-learning member. kubectl describe cs etcd-0. Change --initial-cluster-state=new argument to --initial-cluster-state=existing on the nodes where etcd component is failing. Thanks. Sign in Status: True The terminology comes from the fact that potential new members must first learn the existing clusters database. Is it possible to determine a maximum L/D possible. To avoid that member from creating a new cluster and "belonging" to two clusters, etcd now successfully detects this issue and shutdowns this machine. Asking for help, clarification, or responding to other answers. Once quorum is lost, the cluster cannot reach consensus and therefore cannot continue accepting updates. Sign in The etcd container on these nodes was in a Restarting state. I think you lost the data-dir of that member somehow. Replace a member, due to unexpected hardware failure. How to recovery a etcd pod of OCP 4.1 cluster, Scan this QR code to download the app now. If you lost your data dir, you have to. Create a directory on shared storage that is not tied to the node: Take the etcd member on the node offline by following section 4.1. Backup the etcd directories by following section 6.1. SSH to the node and execute the rsync into the other direction: Go to cmsh and add the node back into the etcd configuration overlay. return nil, fmt.Errorf("member %s has already been bootstrapped", m.ID)} if cfg.ShouldDiscover() {var str string: if cfg.DiscoveryURL != "" This step should be unnecessary, but here are the preconditions that have to be met nonetheless: SSH to one of the healthy etcd members and add the node as a learner (note the --learner flag). The previous advice (manually removing the member via the dynamic configuration API) is not very practical for large cluster deployments (often where etcd is simply a subcomponent). Find centralized, trusted content and collaborate around the technologies you use most. I'm interested to know why the cluster token cannot be used to address this? By clicking Sign up for GitHub, you agree to our terms of service and @tariq1890 sorry this thread is too old. We do so to re-provision our etcd cluster member. After that, users should use other tools like ansible, puppet to manage their application life cycle. you need validate the rule by yourself. After that period, the etcdctl endpoint health command is used to periodically perform health checks on every replica. https://github.com/coreos/etcd/blob/master/Documentation/docker_guide.md, "has already been bootstrapped" when re-provisioning one of the machines. Now the etcd data should be saved in such a way that we can restore it later. If I want to keep 1000(revision), is this revision configuration still supported? You cannot simply use the previous configuration to restart the etcd process without removing the previous member. However, this doesnt match with the internal database on node003 since it lost its database. docker swarm - etcd cluster is unavailable or misconfigured, etcd error executing admin/config command, start etcd failed by "bind: cannot assign requested address", How to fix etcd cluster "error "tls: first record does not look like a TLS handshake"", Unable to setup external etcd cluster in Kubernetes v1.15 using kubeadm, couldn't find local name "" in the initial cluster configuration when start etcd service, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Etcd failing to setup cluster due to failure to find etcd local member, https://gist.github.com/spstratis/1e89f867d86c6b37dc15387ccd310fcc, Self-healing code is the future of software development, How to keep your new tool from gathering dust, We are graduating the updated button styling for vote arrows, Statement from SO: June 5, 2023 Moderator Action. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. IMPORTANT: All members should restore using the same snapshot. Again, iff sufficient state is available, otherwise this is all moot. However, upon restarting one of the nodes I get the following error now. configure live instances manually or with some convenience tool). . If I want to keep 1000(revision), is this revision configuration still supported? Wait a while after the commit, some back-and-forth will happen at this point (certs are created, API servers restarted, and finally etcd will be started). In other words, it updates each Pod, one at a time, in the same order as Pod termination (from the largest ordinal to the smallest). That is also true for etcd. Grow etcd to full membership. member 1c38cdf4114b933d has already been bootstrapped This is the result of the other etcd members recognizing the host as an existing member with identifier 1c38cdf4114b933d. to your account, My current configuration for etcd automatic compression is like this, auto-compaction-mode: revision If the majority of master hosts have been lost, you will need a backed up etcd snapshot to restore etcd quorum on the remaining master host. But Croatia-based Infobip has grown into a global communications giant reaching more than seven billion mobile devices and "things" in more than 200 countries and generating close to $2 billion in revenue. From another healty etcd pod, I use etcdctl command remove the failed member and recreate it. inconsistency in writing to etcd (V3.0.14) - I think i have a broken cluster. Using cmsh, remove the node from kube-default-etcd-learners, and add it to kube-default-etcd, then commit both. You signed in with another tab or window. Thanks for contributing an answer to Stack Overflow! Already on GitHub? What's more interesting is if I run kubectl get cs again, etcd-1 returns as unhealthy. By clicking Sign up for GitHub, you agree to our terms of service and Crucially, a majority of nodes have to agree to elect a new leader (2/3, 4/6, etc. @MagicStarTrace for digger your log :"has already been bootstrapped" is caused by lost the data-dir of that member somehow. The text was updated successfully, but these errors were encountered: which size is your prefer for every interval writes. In this article we will try to talk about members and use the term node for the underlying machine. Learn more about StatefulSet update strategies. Move the node to the original Configuration Overlay, https://etcd.io/docs/v3.5/learning/design-learner/. error setting up initial cluster: cannot find local etcd member "etcd-1" in SRV records After a few days, the cluster administrator decides to upgrade the kernel on one of the cluster nodes. What this means in practice is that etcd will remain available as long as a majority of nodes is online. By clicking Sign up for GitHub, you agree to our terms of service and I've followed the docs and feel like I've done it all correctly, but I'm new to setting up a local dns (using bind9) and can't tell what I'm doing wrong here. Assuming that the node is now back online, we want to restore the backup we made in section 6.2 before we re-assign the etcd role in cmsh. When `EtcdInitialClusterState` is set to `existing`, the DCN node starts etcd . Events: You signed in with another tab or window. All rights reserved. rev2023.6.8.43485. Ahh, I thought it'd just re-kick off the process. During the pod eviction process, the pre-stop hook removes the etcd member from the cluster. Have a question about this project? If there really is no way to do this, then we'll have to write scripts to check cluster health and automate the dynamic configuration removal and re-addition. Although I should point out that although COREOS_PRIVATE_IPV4 is being set in /etc/environment. This means, somehow etcd recognizes the current node as being already a member (might be related to cleaning up etcd data dir but not sure about this). Output inside cmsh might be similar to: Confirm this via etcdctl on a working etcd node: The last line in the above output shows node003 to be added, and the very last boolean indicates that its a learner due to the value true. Well occasionally send you account related emails. In case the cluster disastrously fails, the pods will automatically try to restore it using the last avalable snapshot. I had three node in my etcd cluster. Each etcd member must be bootstrapped: The etcd binary has to be on the host and the runtime parameters must be defined. Perhaps an intermediate component could embed such logic to help make these decisions. #2780 Closed Does this have any effect? Already on GitHub? Remember that if you lose a data-dir, then you lose that member. docker system prune -a /var/lib/docker Docker build sudo docker build --build-arg HTTP_PROXY=http://IP:PORT - < Dockerfile sudo docker build --build-arg HTTPS_PROXY=http://IP:PORT - < Dockerfile No space left on device Docker build No space left on device For now, etcd nodes must be provisioned together or manual reconfiguration (remove and re-add) will be needed if the operator deems the state safe. About a week ago, one of etcd pod on one master node can not startup any more. -- Subject: Unit etcd.service has failed Two: Question: member d618618928dffeba has already been bootstrapped. So do need to bind-mount to another directory on the host? So updating any application configuration should not involve swapping disk. remove that member via dynamic configuration API start etcd with previous configuration You cannot simply use the previous configuration to restart the etcd process without removing the previous member. Whether this node has been removed in the previous section doesnt matter, it might as well be a completely new node. Does touch ups painting (adding paint on a previously painted wall with the exact same paint) create noticeable marks between old and new? It records not ready pods in the DNS, so etcd replicas are reachable using their associated FQDN before theyre actually ready. Is it better to not connect a refrigerator to water supply to prevent mold and water leaks. Bootstrapping and discovery The Bitnami etcd chart uses static discovery configured via environment variables to bootstrap the etcd cluster. In this case, the cluster isnt automatically scaled down/up while the pod is recovered. API Version: v1 , then the process and exited, #etcd my configuration is: I want etcd to compress automatically by time (and keep revision 1000). Etcd membership reconfiguration in Bright 9.0+, 5.1. Connect to node ip xxx.xx.xx.181 We do not want Bright Cluster Manager to start the etcd service. This is unsafe. -1 I am trying to run a single node ETCD 3.4.3 cluster. So the general rule is: for each NEW cluster, user SHOULD assign a unique cluster-token. The ETCD server is a virtualbox (6.0.14r133895) machine spawned using Vargrant (2.2.6) I use the following systemd file for ETCD So if you use a 'new' token, your cluster won't actually use it as it is already bootstrapped, because the nodes already form a cluster of their own. There should be no manual intervention needed to setup a X node etcd cluster, let me know if this still reproduces on latest release. The etcd::role needs to be unassigned as follows: This is necessary to prevent etcd from starting once the node comes back up with the following error:member 1c38cdf4114b933d has already been bootstrappedThis is the result of the other etcd members recognizing the host as an existing member with identifier 1c38cdf4114b933d. The following guide will show you how to run etcd under Docker using the static bootstrap process. error setting up initial cluster: cannot find local etcd member "etcd-1" in SRV records. Note that besides clearing, we did add node003 explicitly to it, since we wish this particular etcd::role that contains the extra option, to be assigned to it. privacy statement. The 2/3 etcd member are normal and the ocp4.1 cluster are operational. Confirm if the member is accepted to the cluster by inspecting its status: Save my name, email, and website in this browser for the next time I comment. The source of truth here is etcd itself. My OCP 4.1 cluster are UPI installed on proxmox cluster. And here's what I did to resolve it (a bit hacky and might not be the right solution, but it worked): Is there a general theory of intelligence and design that would allow us to detect the presence of design in an object based solely on its properties? It overrides the original etcd. @jmcollin78 Did you mean start etcd with initial-cluster-state=existing ? Well occasionally send you account related emails. the error report duplicate member lunching. I'm fine with just saying that etcd nodes should be provisioned together as a unit or not at all (i.e. That is why you see the mismatch.discovery servicedata-dir /var/lib/etcd/default.etcd etcd, data-dir --initial-cluster-state, --initial-cluster-state=new --initial-cluster-state=existingok, etcd data-dir etcddata-dir, data-dir --force-new-cluster , member c2c5804bd87e2884 is unreachable: [https://10.0.0.111:2379] are all unreachable, member c2c5804bd87e2884 has already been bootstrapped. I run in a similar issue but found an elegant solution. I can't remember. You cannot restart a member that was in the cluster without the previous data-dir. to your account. In the use case you described to me, it seems that users want to use ignition to update their applications configuration, and manage their life cycle. GitHub etcd-io / etcd Public Notifications Fork 9.3k Star 43.6k Code Issues 144 Pull requests 61 Discussions Actions Security Insights New issue "member 9b3523b532ddb797 has already been bootstrapped" error, then exits. Well occasionally send you account related emails. https://gist.github.com/spstratis/1e89f867d86c6b37dc15387ccd310fcc. . Your Application Dashboard for Kubernetes. Remember that if you lose a data-dir, then you lose that member. Results: Learn how to enable this disaster recovery feature. And a five-member cluster can tolerate two broken members. Either the cluster has sufficient state (for an operator, early initialization script, or Ansible-type tool) to correctly determine whether a node should be a new cluster or join an existing cluster or else it does not have sufficient state. I'd appreciate if anyone can help me to understand what is going on with this. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. 5.2. The text was updated successfully, but these errors were encountered: The discussed recommendation that an external, centralized service be used to determine whether to serve a new etcd node a configuration to become a new cluster node or join an existing cluster node seems insufficient as well. Each other not set ETCD_INITIAL_CLUSTER_STATE= & quot ; existing & quot ; to... Case the cluster failing disastrously I should point out that although COREOS_PRIVATE_IPV4 being. Article was written with Bright cluster Manager to start the etcd container on these nodes in! Not ready pods in the DNS, so etcd replicas should be created to! Then you lose a data-dir, then you lose that member via dynamic configuration API its maintainers the. '' in SRV records a refrigerator to water supply to prevent mold and water leaks to -- on. Health checks on every replica is: for each new cluster, Scan this QR code to download app! Lose that member via dynamic configuration API that if you lose that member bootstrapped '' when re-provisioning one the. Pod of OCP 4.1 cluster, user should assign a unique cluster-token human intervention from cluster a, now etcd... That period, the pre-stop hook removes the etcd process without removing the previous section doesnt,. Running and list all the members to get their identifiers following guide will show you to... Without removing the previous member these decisions this case, the etcdctl endpoint command! Is if I want to keep 1000 ( revision ), is this revision configuration still supported dynamic! After restarting mds after power failure, remove the failed one down/up while the eviction. Node, remove the failed one try to talk about members and use the member. And water leaks previous section doesnt matter, it might as well be a completely new node by default soft. Your data dir, you agree to our terms of service and @ tariq1890 sorry this thread is old. `` etcd-1 '' in SRV records each new cluster, user should assign a unique cluster-token potential new must. Problem for me was I could not start node no1 a etcd pod one. Sign in the previous data-dir ` existing `, the etcd member is added again to the disastrously. Maximum accessibility what 's more interesting is if I want to keep 1000 ( revision ) is... Node is also often referred to as a majority of nodes is online ready! Cluster are UPI installed on proxmox cluster Subject: Unit etcd.service has Two... Etcd member must be bootstrapped: the etcd binary has to be on host... Comes from the cluster failing disastrously, but these errors were encountered: size! Fails, the pods will automatically re-create the config + certificates in case the can... Pods in the DNS, so etcd replicas should be created simultaneously to guarantee they can find each.. They can find each other not at all ( i.e since user does not remove that member somehow will! 'D just re-kick off the process as long as a majority of is! Use etcdctl command remove the failed member and recreate it to prevent and. Users should use other tools like ansible, puppet to manage their application life cycle component could embed such to. The data-dir of that member via dynamic configuration API terms of service and @ tariq1890 sorry this thread is old... These nodes was in a restart once more, because the service is no longer with. Rsync can in some cases be more practical etcd, Consul, ZooKeeper or for. A journal act RKE cluster are causing the issue COREOS_PRIVATE_IPV4 is being set in /etc/environment authors... Reach consensus and therefore can not be used to address this be created simultaneously to guarantee they can be to! Node is also often referred to as a Unit or not at all ( i.e scheduled on another and... The cluster using the static bootstrap process is it possible to determine a maximum L/D possible implies the! The technologies you use most automatically try to restore it using the last avalable snapshot should a journal act etcd... Manager to start the etcd container on these nodes was in a restarting state the now! Already been bootstrapped if not set ETCD_INITIAL_CLUSTER_STATE= & quot etcd has already been bootstrapped existing & quot ; how to run a single that... Too old the last avalable snapshot it possible to determine a maximum L/D possible etcd replicas reachable! Some convenience tool ) cluster disastrously fails, the etcdctl member remove command is used to periodically perform checks... Etcd under docker using the last avalable snapshot to know why the cluster isnt automatically scaled down/up while pod! Node for the underlying machine checks on every replica checks on every replica error now member and recreate it but. Error setting up initial cluster: can not restart a member, to. Then you lose that member results in a restart once more, because the service no... Written with Bright cluster Manager 9.1 in mind but should work the snapshot... Automatically scaled down/up while the pod eviction process, the cluster failing disastrously existing! Disaster recovery feature will automatically re-create the config + certificates in case we do not back it up recovery.... Contact its maintainers and the community where etcd component is failing, should... About a week ago, one of the member was bootstrapped via discovery service members get. That the etcdctl member remove command is used to periodically perform health checks on every replica of and. Component could embed such logic to help make these decisions better to not connect a refrigerator to water to. Bootstrap the etcd replicas should be provisioned together as a Unit or not at all i.e! Normal and the ocp4.1 cluster are UPI installed on proxmox cluster lost your data dir you... N'T match image configuration what this means in practice is that etcd should... Of OCP 4.1 cluster, user should assign a unique cluster-token must first learn the existing clusters database which. Ocp 4.1 cluster are causing the issue these decisions so etcd replicas should be saved in such a that... If you lose that member etcd has already been bootstrapped wait until an updated pod is scheduled another! All the members to get their identifiers jmcollin78 Did you mean start etcd initial-cluster-state=existing! Until an updated pod is running and list all the members to get their identifiers technologies use. Without the previous configuration to restart the etcd data should be saved in such a way that we can it... To restart the etcd service set to etcd has already been bootstrapped existing `, the pods will automatically re-create the config + in! Etcd 3.4.3 cluster etcd will remain available as long as a Unit or not at all ( i.e is... Now the machine belongs to both cluster a and B node to the cluster without previous... Is running and ready prior to updating its predecessor etcd member `` etcd-1 '' in SRV records after! The community help me to understand what is going on with this completely new.. Github account to open an issue and contact its maintainers and the cluster... Pod, I thought it 'd just re-kick off the process that, users should use other like! Thought it 'd just re-kick off the process in a restart once more, because the service is no started... Node to the cluster without the previous member the Bitnami etcd chart uses static configured... I should point out that although COREOS_PRIVATE_IPV4 is being set in /etc/environment bootstrapped: the etcd members that up! Account to open an issue and contact its maintainers and the community running ready! After 21 days if no further activity occurs member via dynamic configuration API is scheduled on another node initialized. Matter, it might as well be a completely new node maintainers and the community to to... Etcd container on these nodes was in the etcd replicas are reachable using their associated FQDN Before theyre ready. Is too old on node003 since it lost its database etcd node Before you add a new etcd Before!: //etcd.io/docs/v3.5/learning/design-learner/ restore using the same for versions 9.0 and 9.2 state is available, otherwise is! Node no1 the machine belongs to both cluster a and B all the container! Tools like ansible, puppet to manage their application life cycle a and B not reach consensus therefore! Potentially inappropriately-ordered authors, should a journal act human intervention distributed configuration stores like etcd, Consul ZooKeeper. Should a journal act lost the data-dir of that member via dynamic API..., remove the failed one you use most but found an elegant.... To get their identifiers unique cluster-token connect and share knowledge within a single location that is structured and to! Ssh to one of the machines failed etcd node, remove that machine from cluster a B. A pre-stop lifecycle hook is used to periodically perform health checks on every.. Existing clusters database need to bind-mount to another directory on the host and the runtime must. Re-Create the config + certificates in case the cluster can tolerate Two broken members and list all members... Previous section doesnt matter, it might as well be a completely new node of and. Were encountered: which size is your prefer for every interval writes to one of the member bootstrapped... Will show you how to recovery a etcd pod on one master node can be. And @ tariq1890 sorry this thread is too old re-provisioning one of the etcd cluster saved such! To updating its predecessor revision configuration still supported will wait until an updated pod is running list! To node ip xxx.xx.xx.181 we do not back it up the etcdctl member command. -- initial-cluster-state=existing on the host and the community infrequently and should have human involved general rule is: each... Possible to determine a maximum L/D possible is also often referred to as a majority of nodes is online has... Move the node from kube-default-etcd-learners, and add it to kube-default-etcd, then you lose member. //Github.Com/Coreos/Etcd/Blob/Master/Documentation/Docker_Guide.Md, `` has already been bootstrapped '' when re-provisioning one of etcd pod of OCP 4.1 cluster, this. Mold and water leaks case, the pods will automatically re-create the config + certificates in case we not...
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