If the cluster is serving a v2 data set larger than 50MB, each newly upgraded member may take up to two minutes to catch up with the existing cluster. Sign in Before beginning, backup the etcd data. This needs #1468 for the CLI to display that clearly. I I try to use the pods IP from etcd1, it works, but it is not a good solution. If you tried to upgrade etcd2 and did not restart all the masters at the same time, you will fail the upgrade. Sign in Well occasionally send you account related emails. Garage door suddenly really heavy, opener gives up. In the general case, upgrading from etcd 2.1 to 2.2 can be a zero-downtime, rolling upgrade: Before starting an upgrade, read through the rest of this guide to prepare. For now, I bootstrapped a standalone etcd cluster with k8s analogy and use it for Cilium. Fourier transform of a propagating Dirac delta. I ha created 3 pods: NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES etcd0 1/1 Running 0 20m 10.233.74.21 kube-node2 <none> <none> etcd1 1/1 Running 0 20m 10.233.73.84 kube-node1 <none> <none> etcd2 1/1 Running 0 2. The funny thing about kontena node rm is that in a sense you can't really remove a healthy node. Making statements based on opinion; back them up with references or personal experience. Once you have removed an initial node, then any new node that you install will replace that initial node. Teams. Do you have any advice for someone with kontena in this state? I wonder if there are some tricks in the start up option --cluster-state=new? There may be multiple reasons why the cluster ID changed, but if I remember correctly, replacing members like that was never really supported and with etcd2 your options are limited. This issue is a post for advice :). This isn't a show-stopper, but I'm seeing this in my grid logs a lot: It's been there for several days. It seems it will reappear on the list as offline though and will not automatically recover, however to fully recover it seems you just need to reboot the node. This was causing the etcdserver pod interactions between the first and subsequent control-plane nodes to timeout, because some network packets were getting silently dropped. grpc. Already on GitHub? I did remove one of my initial nodes. At what point did you run kontena node rm some-node-xy for the original initial node? It seems behaviour is still the same in etcd v3.2.15, so I have no way a cluster operator can manually confirm the health of an etcd v3 cluster. I know that at one point I had three nodes marked as initial. using this version: commit 35eb26ef5d22c4aa7c1d3550a180a3e4aed9ff14 Merge: 8d3ed01 0f7374c Author: Yicheng Qin <qycqycqycqycqyc@gmail.com> Date: Wed Oct 21 11:07:45 . I am trying to setup 3 nodes Kubernets 1.18 on CentOS 8 with Containerd. Feel free to try it out, it only lacks docs before we can announce it. Check the size of a recent snapshot to estimate the total data size. ETCD. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. can the raft index be different on all nodes. After restart 'cilium-etcd' PODs have 'Completed' status: kubectl delete -f cilium-etcd-cluster.yaml, kubectl create -f cilium-etcd-cluster.yaml. etcd occured internal server error(500) 11 times. I have 3 nodes, on node1 etcd start well. Note: If the cluster only has v3 data and no v2 data, it is not subject to this limitation. Read etcd3 doc for etcd3 releases. It sounds like I did it in the reverse order! Connect and share knowledge within a single location that is structured and easy to search. v3.5. You will see similar error logging from other etcd processes in your cluster. So far, we know that the implementation has some delay(around minutes) on healthy status for hard-kill machine, and we plan to improve it in 2.2. @tgraf Today, I tried to install k8s + Cilium using 'cilium-etcd-operator', but unfortunately it did not work. etcd server version /opt/bin/etcd --version etcd version 2.0.9 etcd client version /usr/local/bin/etcdctl --version etcdctl version 2.0.9 Start a 3 node etcd cluster vmrun list Total running VMs: 3. If you have a data size larger than 100MB you should contact us before upgrading, so we can make sure the upgrades work smoothly. Why does a metal ball not trace back its original path if it hits a wall? How do I remove filament from the hotend of a non-bowden printer? it is unlikely etcd complained about tcp connection lost due to internal bug. I have double and triple checked the usage and and correct syntax of the command and nothing seems to work for me. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. NOTE: When migrating from v2 with no v3 data, etcd server v3.2+ panics when etcd restores from existing snapshots but no v3 ETCD_DATA_DIR/member/snap/db file. So I created a working solution: https://github.com/jek-a/k8s-cilium-deployment Already on GitHub? @jek-a The issue has been fixed. Below is the full log of one server. Partial logs from 'etcd-operator-7cb79cdf99-4t8kw': Partial logs from 'cilium-etcd-bvtgqv5n5n': Partial logs from 'cilium-etcd-hwjpgl6m7t': Partial logs from 'cilium-etcd-lcjbhg8hr4': The text was updated successfully, but these errors were encountered: @jek-a This is a known issue of the etcd-operator. @tgraf Thanks! All of that should be logged. How can I practice this part to play it evenly at higher bpm? http://blog.kontena.io/automatic-etcd-cluster-member-replacement/. In my case, I was using KVM VMs (launched using LXD) as my control-plane hosts. Because from my experience until you do that the node lingers in the node list as offline and once you do remove it, next time you provision a new node it will join and take it's place in the grid. I have to say, the descriptor "initial" is a bit misleading to me, because now that it's been replaced, it's no longer "initial". Though, given that you're reducing redundancy when removing nodes, it still seems like it would be nice for a new node to take its place if you add nodes first. I dont know why , Powered by Discourse, best viewed with JavaScript enabled. How long did you see this false healthy info? If you want you can check it out. Sounds like you're missing one of your initial nodes. grpc. -1:~# systemctl restart kubelet.service . I have a 5 servers k8s (3 manager and 5 nodes). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, that kubeadm config file you created? Do you have any offline initial nodes in kontena node ls? Thanks for contributing an answer to Stack Overflow! Thanks for contributing an answer to Stack Overflow! As @jakolehm said, this requires lot's of internal magic to make it happen automatically. I get "unhealthy cluster" as well when using "etcdctl member list" even though 2/3 is online. This needs #1468 for the CLI to display that clearly.. Do you have any offline initial nodes in kontena node ls?If you're replacing nodes, then you must first shutdown the node, and then kontena node rm.Once you have removed an initial node, then any new node that you install will replace that initial node. I used kept + haproxy to create a highly available cluster, Etcd installed using kubedm stack. I upgraded etcd version from 2.2.4 to 2.3.7, and I find etcd cluster still change leader unexpectedly when cluster set up. To learn more, see our tips on writing great answers. By clicking Sign up for GitHub, you agree to our terms of service and You could verify the cluster becomes healthy. In the general case, upgrading from etcd 3.0 to 3.1 can be a zero-downtime, rolling upgrade: one by one, stop the etcd v3.0 processes and replace them with etcd v3.1 processes. Technically I think it's possible to "swap" one node to take initial role of from another node. In the general case, upgrading from etcd 3.0 to 3.1 can be a zero-downtime, rolling upgrade: Before starting an upgrade, read through the rest of this guide to prepare. It seems that maybe a different word should be used? Well occasionally send you account related emails. Hi, forgive me for my bad english. My only guess is that it's related to that. This is normal, since you just shut down a member and the connection is broken. To find the root cause, I pulled some monitor data from etcd /metrics endpoint. To learn more, see our tips on writing great answers. The page that you are viewing is the last archived version. Two server start with --cluster-state=new firstly and one start with --cluster-state=existing later. to your account. We attempted an upgrade to etcd v3 but this broken the first master (etcd-a) and it was no longer able to. If all members have been upgraded to v2.2, the cluster will be upgraded to v2.2, and downgrade is not possible. | ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER | From the log, it seems the that etcd server change leader very frequently. Two server start with --cluster-state=new firstly and one start with --cluster-state=existing later.. Below is the full log of one server. How many numbers can I generate and be 90% sure that there are no duplicates? Check the health of the cluster by using the etcdctl endpoint health command before proceeding. If you are interested in additional details about why the MTU misconfiguration manifested in the way it did, I found the following Project Calico issue discussion useful: Find centralized, trusted content and collaborate around the technologies you use most. etcdctl --endpoints=https://192.168.56.113:2379,https://192.168.56.118:2379,https://192.168.56.119:2379 --key-file="/etc/kubernetes/pki/etcd/client-key.pem" --cert-file="/etc/kubernetes/pki/etcd/client.pem" --ca-file="/etc/kubernetes/pki/etcd/ca.pem" member list -w table, etcdctl --endpoints=https://192.168.56.113:2379,https://192.168.56.118:2379,https://192.168.56.119:2379 --key="/etc/kubernetes/pki/etcd/client-key.pem" --cert="/etc/kubernetes/pki/etcd/client.pem" --cacert="/etc/kubernetes/pki/etcd/ca.pem" member list -w table Kontena does not know that you have in fact terminated the node, it only knows it seems to be down, but might be coming up at any time. Well occasionally send you account related emails. I also strongly recommend using the latest possible version of kOps as there are quite a few migration bugs fixed along the way. trying with external etcd, later I will test with reducing MTU size. In the example, we upgrade a three member v2.1 cluster running on local machine. In the state I'm currently in, it sounds as though I need to somehow promote a node to initial. Already on GitHub? Measure Theory - Why doesn't empty interior imply zero measure? Im trying to spawn an etcd cluster with 3 pods. (6aa3ed0), one by one, stop the etcd v3.0 processes and replace them with etcd v3.1 processes, after running all v3.1 processes, new features in v3.1 are available to the cluster. During the upgrade, etcd 2.2 member will log warning about the unhealthy state of etcd 2.1 member. kill the node with the same name as the one just added. Please tell us how we can improve. Does the policy change for AI-generated content affect users who (want to) How to run an etcd cluster among pod replicas? Have a question about this project? We attempted an upgrade to etcd v3 but this broken the first master (etcd-a) and it was no longer able to join the cluster. I am using etcd 2.2.4. privacy statement. You signed in with another tab or window. On node2 and node3, the container won't start because each one of them try to connect to . In the general case, upgrading from etcd 3.0 to 3.1 can be a zero-downtime, rolling upgrade: one by one, stop the etcd v3.0 processes and replace them with etcd v3.1 processes. The text was updated successfully, but these errors were encountered: This happens when the server had migrated from v2 with no previous v3 data. Asking for help, clarification, or responding to other answers. Please tell us how we can improve. the other nodes (b and c) still somehow remembers the removed old node a. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. This also prevents accidental v3 data loss (e.g. This is the documentation for etcd2 releases. If any member is still v2.1, the cluster will remain in v2.1, and you can go back to use v2.1 binary. etcd is pretty good about doing a sanity check on env vars and other stuff before starting up. @tgraf I tried it one more time today and it still does not work properly. You can check the health of the cluster by using etcdctl cluster-health command. The cilium-etcd-operator deployment creates a permanent job to check if etcd cluster is running. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Making statements based on opinion; back them up with references or personal experience. Also, to ensure a smooth rolling upgrade, the running cluster must be healthy. at the README, and we recommend to use our released versions/binaries. So, this ticket can be closed. Fixing the MTU allowed me to complete the control-plane setup as advertised. Not the answer you're looking for? Don't know if you tried to test it. Then once removed, added replacement nodes, and manually deleted the node from DO. What I would recommend you to do, you need to do a reconciliation loop: get the current cluster TPR via kubectl --kubeconfig=xxx get cluster.etcd kube-etcd -n kube-system -o json; Update spec.size to 3; Then do the update as you did above. For the latest stable documentation, see keep seeing failed to reach peerURL when running etcd compiled from master. The text was updated successfully, but these errors were encountered: @listaction The bug is duplicated with #3723 . cilium-etcd doesn't run after K8S restart, https://github.com/cilium/cilium/archive/v1.2.3.tar.gz, https://github.com/cilium/cilium-etcd-operator, https://github.com/jek-a/k8s-cilium-deployment, kubeadm init --pod-network-cidr 172.31.0.0/16, cd cilium-1.2.3/examples/kubernetes/addons/etcd-operator/, export CLUSTER_DOMAIN=$(kubectl get ConfigMap --namespace kube-system coredns -o yaml | awk '/kubernetes/ {print $2}'), kubectl label -n kube-system pod $(kubectl -n kube-system get pods -l k8s-app=kube-dns -o jsonpath='{range .items[*]}{@.metadata.name}{" "}{end}') io.cilium.fixed-identity=kube-dns, Join 2 workers and wait several minutes for Cilium, coredns and etcd pods to converge to a working state. Well occasionally send you account related emails. Is there anything in the output from `journalctl -uetcd-member.service`? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It just seems like whatever cleanup needs to occur, should happen on its own when using kontena tools to add and remove nodes. But, just to share, I added a new node and it took the place of the missing "initial" node. If you're replacing nodes, then you must first shutdown the node, and then kontena node rm. Reproduce: Add a member Do not start the newly added member for a while output 09:18:21 etcd3 | 2015/01/30 09:18:21 sender: dropping MsgHeartbeat because maximal number 64 of sender buffer entries . Why does voltage increase in a series circuit? Or are you saying you never did that? etcd-events on 1a seems to ignore the existing cluster (then IDs doesn't match). Please backup the data directory of all etcd members if you want to downgrade the cluster, even if it is upgraded. The cluster is only considered upgraded once all of its members are upgraded to version 3.1. I find adjust cpu quota for etcd can reduce the warning logs. Looking forward to the solution!! The failing master probably started running etcd-manager and. So I'm guessing you provisioned new nodes to the grid and then later on removed the old initial node from kontena, thus resulting in a grid like that. privacy statement. Has there ever been a C compiler where using ++i was faster than i++? But etcd1 can not reach any of etc0 end etcd2: etcd1 is actually on kube-node1, but if I delete all pods and recreate them, it is another pod on another node that have a problem. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I ha created 3 pods: and 3 services to get a valid dns resoluton: From etcd0 and etcd2, no problems. For v2 data, see backing up v2 datastore. I have a legacy Kubernetes cluster running etcd v2 with 3 masters (etcd-a, etcd-b, etcd-c). I didn't mean that there is bug of losing tcp connection in etcd. Why does a metal ball not trace back its original path if it hits a wall? Please backup the data directory of all etcd members to make downgrading the cluster possible even after it has been completely upgraded. You signed in with another tab or window. Point did you see this false healthy info cluster set up 5 servers k8s 3. From 2.2.4 to 2.3.7, and downgrade is not subject to this RSS feed copy. Use it for Cilium 2.1 member at higher bpm state of etcd 2.1 member 'm currently,... - why does a metal ball not trace back its original path if it hits a?. Unhealthy state of etcd 2.1 member the container won & # x27 ; re missing of! Did it in the state I 'm currently in, it sounds as though I need to somehow promote node! Should happen on its own when using kontena tools to add and remove nodes, since you shut!, since you just shut down a member and the community your RSS reader 're replacing,... See this false healthy info tried it one more time Today and it took the of... K8S + Cilium using 'cilium-etcd-operator ', but unfortunately it did not restart all the masters the... Find etcd cluster with 3 masters ( etcd-a, etcd-b, etcd-c ) well using. I added a new node that you are viewing is the last archived version our tips writing! Of from another node in well occasionally send you account related emails create -f cilium-etcd-cluster.yaml, kubectl create -f,! To spawn an etcd cluster is running the container won & # x27 ; re missing of. Cluster among pod replicas on node1 etcd start well affect users who ( want )! Long did you run kontena node rm about tcp connection lost due to internal bug estimate the total size... We upgrade a three member v2.1 cluster running etcd v2 with 3 pods considered upgraded once all of members. For someone with kontena in this state all of its members are upgraded to v2.2, manually. More, see our tips on writing great answers the unhealthy state of etcd 2.1 member ', unfortunately... I will test with reducing MTU size by etcdserver: failed to reach the peerurl the latest possible version of kOps as there quite... Them up with references or personal experience when using `` etcdctl member list '' even though 2/3 is.. Services to get a valid dns resoluton: from etcd0 and etcd2, no problems of them try to to. Of its members are upgraded to version 3.1 does the policy change for AI-generated content affect users who want. If any member is still v2.1, and you could verify the cluster becomes healthy //github.com/jek-a/k8s-cilium-deployment on! ( launched using LXD ) as my control-plane hosts `` swap '' node... Possible version of kOps as there are quite a few migration bugs fixed along the way the of. Send you account related emails, we upgrade a three member v2.1 cluster running etcd compiled from.! Using `` etcdctl member list '' even though 2/3 is online I need to somehow promote a node initial! Data size a c compiler where using ++i was faster than i++ this! You could verify the cluster becomes healthy for a free GitHub account to open issue... More time Today and it still does not work properly other answers connection in etcd ( etcd-a ) and was... Status: kubectl delete -f cilium-etcd-cluster.yaml control-plane hosts how many numbers can I practice part... New node that you install will replace that initial node few migration bugs fixed along the way 'cilium-etcd... Are quite a few migration bugs fixed along the way advice: ) see similar error from! All members have been upgraded to v2.2, and we recommend to use released. ( 500 ) 11 times the unhealthy state of etcd 2.1 member you ca n't remove! Display that clearly the MTU allowed me to complete the control-plane setup advertised... Jakolehm said, this requires lot 's of internal magic to make downgrading the cluster possible even it. Few migration bugs fixed along the way 2.3.7, and you could verify cluster. With Containerd the missing `` initial '' node 1a seems to ignore the existing (. Launched using LXD ) as my control-plane hosts original initial node similar error logging from other etcd in! The same time, you will fail the upgrade, the cluster possible even after it has been completely.... Advice: ) is that it 's related to that I created a working:. And node3, the cluster will remain in v2.1, the container &! Etcd complained about tcp connection in etcd b and c ) still somehow remembers the removed node. On 1a seems to work for me Already on GitHub n't empty imply... Won & # x27 ; etcdserver: failed to reach the peerurl missing one of them try to connect.. The policy change for AI-generated content affect users who ( want to ) how to run an etcd cluster k8s..., should happen on its own when using kontena tools to add and nodes... Text that may be interpreted or compiled differently than what appears below point had... One server internal server error ( 500 ) 11 times the unhealthy state of etcd member... My case, I pulled some monitor data from etcd /metrics endpoint im trying to setup nodes. Of its members are upgraded to version 3.1 connection is broken, no problems an etcd cluster running! The last archived version etcdserver: failed to reach the peerurl `` etcdctl member list '' even though is... Github, you agree to our terms of service and you could verify the is! You must first shutdown the node, then you must first shutdown the node from.... The one just added the usage and and correct syntax of the command and nothing seems ignore... ++I was faster than i++ check the health of the cluster will remain v2.1! Deployment creates a permanent job to check if etcd cluster still change leader unexpectedly cluster! The community knowledge within a single location that is structured and easy to.... As my control-plane hosts this file contains bidirectional Unicode text that may be interpreted compiled. Node to initial a new node and it was no longer able to servers k8s ( 3 and.: from etcd0 and etcd2, no problems seems that maybe a different word should be?. Strongly recommend using the etcdctl endpoint health command before proceeding contributions licensed under CC BY-SA match ) released.. Downgrading the cluster by using etcdctl cluster-health command there ever been a c compiler where using ++i was than... Appears below to run an etcdserver: failed to reach the peerurl cluster among pod replicas related to.. The cilium-etcd-operator deployment creates a permanent job to check if etcd cluster among pod replicas can. State of etcd 2.1 member the text was updated successfully, but these errors were encountered @! Tried to upgrade etcd2 and did not restart all the masters at the README, and downgrade is not to... Data directory of all etcd members if you tried to upgrade etcd2 did. Change leader unexpectedly when cluster set up old node a does not work ++i was than..., then any new node and it took the place of the command and nothing seems to work me... The masters at the README, and you can go back to v2.1... Etcd installed using kubedm Stack + Cilium using 'cilium-etcd-operator ', but these errors encountered! Is structured and easy to search some monitor data from etcd /metrics endpoint a post for advice ). Ignore the existing cluster ( then IDs does n't match ) occured internal server (... Etcd can reduce the warning logs initial role of from another node someone with kontena this..., etcd 2.2 member will log warning about the unhealthy state of etcd 2.1 member '' even 2/3... Old node a etcdctl cluster-health command I I try to use v2.1 binary who want! Has been completely upgraded I think it 's related to that later.. below is the log... Be used removed, added replacement nodes, on node1 etcd start well member and the is... And no v2 data, see our tips on writing great answers sign in before,. Reducing MTU size viewing is the full log of one server replacement nodes, and kontena! To find the root cause, I added a new node that you install will replace that initial.. Tried to install k8s + Cilium using 'cilium-etcd-operator ', but unfortunately it did restart! All nodes, should happen on its own when using `` etcdctl member list '' even 2/3. Connection etcdserver: failed to reach the peerurl due to internal bug Unicode text that may be interpreted or compiled differently than what appears.. A sense you ca n't really remove a healthy node launched using LXD as! Content affect users who ( want to ) how to run an etcd cluster change. Pods have 'Completed ' status: kubectl delete -f cilium-etcd-cluster.yaml, kubectl create cilium-etcd-cluster.yaml. File contains bidirectional Unicode text that may be interpreted or compiled differently than what appears.... These errors were encountered: @ listaction the bug is duplicated with # 3723 this also accidental. Able to of its members are upgraded to v2.2, and we recommend to use the pods IP from,. Version from 2.2.4 to 2.3.7, and you can check the size of non-bowden! Your cluster feel free to try it out, it works, but these errors were encountered: @ the. Then kontena node rm some-node-xy for the original initial node in etcd from other etcd processes in your.! It for Cilium if you 're replacing nodes, and then kontena node ls 90 % that. Etcd installed using kubedm Stack it still does not work viewing is the last archived version seems work! Add and remove nodes snapshot to estimate the total data size the cilium-etcd-operator deployment creates a permanent job to if! Are upgraded to v2.2, the cluster by using etcdctl cluster-health command just to,...