K8s 叢集高可用 master 節點故障如何恢復?
寫在前面
- 很常見的叢集運維場景，整理分享
- 博文內容為 簡單記錄K8s 叢集高可用
master節點故障恢復過程 - 理解不足小夥伴幫忙指正
不必太糾結於當下，也不必太憂慮未來，當你經歷過一些事情的時候，眼前的風景已經和從前不一樣了。——村上春樹
山河已無恙
Red Hat 認證架構師，CNCF 認證 K8s 管理員，CSDN、51CTO 部落格專家，InfoQ 寫作平臺、Alibaba Cloud 開發者社群簽約作者、Huawei Cloud 雲享專家、Tencent Cloud 內容共創官
公眾號
遇到了什麼問題
今天做實驗發現 ，叢集其中一個 master 節點上的 etcd 和 apiserver 都掛掉了，叢集資訊
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get nodes
NAME STATUS ROLES AGE VERSION
vms100.liruilongs.github.io Ready control-plane 415d v1.25.1
vms101.liruilongs.github.io Ready control-plane 415d v1.25.1
vms102.liruilongs.github.io Ready control-plane 415d v1.25.1
vms103.liruilongs.github.io Ready <none> 415d v1.25.1
vms105.liruilongs.github.io Ready <none> 415d v1.25.1
vms106.liruilongs.github.io Ready <none> 415d v1.25.1
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
vms100.liruilongs.github.io 這個節點 上的 apiserver 和 etcd
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep apiserver
kube-system kube-apiserver-vms100.liruilongs.github.io 0/1 CrashLoopBackOff 1448 (3m23s ago) 415d 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms101.liruilongs.github.io 1/1 Running 272 (3h18m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms102.liruilongs.github.io 1/1 Running 246 (3h18m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep etcd
kube-system etcd-vms100.liruilongs.github.io 0/1 CrashLoopBackOff 1244 (3m6s ago) 415d 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system etcd-vms101.liruilongs.github.io 1/1 Running 167 (3h18m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system etcd-vms102.liruilongs.github.io 1/1 Running 173 (3h18m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
檢視 keepalived 對應的靜態Pod執行正常
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep keep
kube-system keepalived-vms100.liruilongs.github.io 1/1 Running 63 (3h50m ago) 415d 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system keepalived-vms101.liruilongs.github.io 1/1 Running 54 (3h51m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system keepalived-vms102.liruilongs.github.io 1/1 Running 60 (3h51m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
所以可能是 etcd 資料不同步，或者什麼原因 導致etcd 掛掉了。因為 每個 master 節點的 apiserver 只和 本節點的 etcd 進行 通訊(每個 etcd 的寫請求會轉發到 etcd 的領導節點)，etcd 掛掉，apiserver 無法提供能力，所以也會掛掉。
透過 etcdctl 可以發現 vms100.liruilongs.github.io 上的 etcd 徹底死掉了
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 \
--cert="/etc/kubernetes/pki/etcd/server.crt" \
--key="/etc/kubernetes/pki/etcd/server.key" \
--cacert="/etc/kubernetes/pki/etcd/ca.crt" \
member list -w table
Error: dial tcp 127.0.0.1:2379: connect: connection refused
如何排查
這裡我們換一個 etcd 節點 執行 命令
檢視 etcd 叢集成員
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ssh vms101.liruilongs.github.io
Last login: Sat Mar 2 09:52:01 2024 from 192.168.26.100
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 \
--cert="/etc/kubernetes/pki/etcd/server.crt" \
--key="/etc/kubernetes/pki/etcd/server.key" \
--cacert="/etc/kubernetes/pki/etcd/ca.crt" \
member list -w table
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ee392e5273e89e2 | started | vms100.liruilongs.github.io | https://192.168.26.100:2380 | https://192.168.26.100:2379 |
| 70059e836d19883d | started | vms101.liruilongs.github.io | https://192.168.26.101:2380 | https://192.168.26.101:2379 |
| b8cb9f66c2e63b91 | started | vms102.liruilongs.github.io | https://192.168.26.102:2380 | https://192.168.26.102:2379 |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
檢視節點狀態
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 \
--cert="/etc/kubernetes/pki/etcd/server.crt" \
--key="/etc/kubernetes/pki/etcd/server.key" \
--cacert="/etc/kubernetes/pki/etcd/ca.crt" \
endpoint status --cluster -w table
Failed to get the status of endpoint https://192.168.26.100:2379 (context deadline exceeded)
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
| https://192.168.26.101:2379 | 70059e836d19883d | 3.5.4 | 88 MB | false | 603 | 22208417 |
| https://192.168.26.102:2379 | b8cb9f66c2e63b91 | 3.5.4 | 88 MB | true | 603 | 22208417 |
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
確定 ETCD 節點故障
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 \
--cert="/etc/kubernetes/pki/etcd/server.crt" \
--key="/etc/kubernetes/pki/etcd/server.key" \
--cacert="/etc/kubernetes/pki/etcd/ca.crt" \
endpoint health --cluster -w table
https://192.168.26.101:2379 is healthy: successfully committed proposal: took = 3.753357ms
https://192.168.26.102:2379 is healthy: successfully committed proposal: took = 2.989943ms
https://192.168.26.100:2379 is unhealthy: failed to connect: dial tcp 192.168.26.100:2379: connect: connection refused
Error: unhealthy cluster
檢視 etcd 的容器日誌
┌──[root@vms100.liruilongs.github.io]-[~]
└─$docker ps -a | grep etcd
0f2f98ebf8c3 a8a176a5d5d6 "etcd --advertise-cl…" 4 minutes ago Exited (2) 4 minutes ago k8s_etcd_etcd-vms100.liruilongs.github.io_kube-system_e8c17bb99f9bd8119cdd769556041e18_1252
a4b39d16a753 registry.aliyuncs.com/google_containers/pause:3.8 "/pause" 4 hours ago Up 4 hours k8s_POD_etcd-vms100.liruilongs.github.io_kube-system_e8c17bb99f9bd8119cdd769556041e18_54
┌──[root@vms100.liruilongs.github.io]-[~]
└─$docker logs 0f2f98ebf8c3
{"level":"info","ts":"2024-03-16T14:46:54.644Z","caller":"etcdmain/etcd.go:73","msg":"Running: ","args":["etcd","--advertise-client-urls=https://192.168.26.100:2379","--cert-file=/etc/kubernetes/pki/etcd/server.crt","--client-cert-auth=true","--data-dir=/var/lib/etcd","--experimental-initial-corrupt-check=true","--experimental-watch-progress-notify-interval=5s","--initial-advertise-peer-urls=https://192.168.26.100:2380","--initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380","--key-file=/etc/kubernetes/pki/etcd/server.key","--listen-client-urls=https://127.0.0.1:2379,https://192.168.26.100:2379","--listen-metrics-urls=http://127.0.0.1:2381","--listen-peer-urls=https://192.168.26.100:2380","--name=vms100.liruilongs.github.io","--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt","--peer-client-cert-auth=true","--peer-key-file=/etc/kubernetes/pki/etcd/peer.key","--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt","--snapshot-count=10000","--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt"]}
{"level":"info","ts":"2024-03-16T14:46:54.645Z","caller":"etcdmain/etcd.go:116","msg":"server has been already initialized","data-dir":"/var/lib/etcd","dir-type":"member"}
{"level":"info","ts":"2024-03-16T14:46:54.645Z","caller":"embed/etcd.go:131","msg":"configuring peer listeners","listen-peer-urls":["https://192.168.26.100:2380"]}
{"level":"info","ts":"2024-03-16T14:46:54.645Z","caller":"embed/etcd.go:479","msg":"starting with peer TLS","tls-info":"cert = /etc/kubernetes/pki/etcd/peer.crt, key = /etc/kubernetes/pki/etcd/peer.key, client-cert=, client-key=, trusted-ca = /etc/kubernetes/pki/etcd/ca.crt, client-cert-auth = true, crl-file = ","cipher-suites":[]}
{"level":"info","ts":"2024-03-16T14:46:54.645Z","caller":"embed/etcd.go:139","msg":"configuring client listeners","listen-client-urls":["https://127.0.0.1:2379","https://192.168.26.100:2379"]}
{"level":"info","ts":"2024-03-16T14:46:54.645Z","caller":"embed/etcd.go:308","msg":"starting an etcd server","etcd-version":"3.5.4","git-sha":"08407ff76","go-version":"go1.16.15","go-os":"linux","go-arch":"amd64","max-cpu-set":4,"max-cpu-available":4,"member-initialized":true,"name":"vms100.liruilongs.github.io","data-dir":"/var/lib/etcd","wal-dir":"","wal-dir-dedicated":"","member-dir":"/var/lib/etcd/member","force-new-cluster":false,"heartbeat-interval":"100ms","election-timeout":"1s","initial-election-tick-advance":true,"snapshot-count":10000,"snapshot-catchup-entries":5000,"initial-advertise-peer-urls":["https://192.168.26.100:2380"],"listen-peer-urls":["https://192.168.26.100:2380"],"advertise-client-urls":["https://192.168.26.100:2379"],"listen-client-urls":["https://127.0.0.1:2379","https://192.168.26.100:2379"],"listen-metrics-urls":["http://127.0.0.1:2381"],"cors":["*"],"host-whitelist":["*"],"initial-cluster":"","initial-cluster-state":"new","initial-cluster-token":"","quota-size-bytes":2147483648,"pre-vote":true,"initial-corrupt-check":true,"corrupt-check-time-interval":"0s","auto-compaction-mode":"periodic","auto-compaction-retention":"0s","auto-compaction-interval":"0s","discovery-url":"","discovery-proxy":"","downgrade-check-interval":"5s"}
panic: freepages: failed to get all reachable pages (page 7744: multiple references)
goroutine 109 [running]:
go.etcd.io/bbolt.(*DB).freepages.func2(0xc00009c480)
/go/pkg/mod/go.etcd.io/bbolt@v1.3.6/db.go:1056 +0xe9
created by go.etcd.io/bbolt.(*DB).freepages
/go/pkg/mod/go.etcd.io/bbolt@v1.3.6/db.go:1054 +0x1cd
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
如何解決
這裡最快的辦法是重新同步一下這個節點的資料，即把這個故障節點移出 叢集，清理完故障節點舊資料在重新新增，操作步驟
清理資料目錄，移動靜態Pod 的yaml 檔案：停止故障節點服務，然後刪除etcd資料目錄。移除故障節點：使用member remove命令剔除錯誤節點,可以在健康的節點執行命令。新增節點：使用member add命令新增故障節點。重新啟動：移動故障節點yaml檔案，進行啟動
注: 靜態Pod 透過載入指定目錄的 yaml 檔案來排程，kubelet會定時掃描，刪除移動 yaml 檔案，靜態 Pod 會自動停止,同理。新增 yaml 檔案會自動建立靜態 Pod
移動靜態Pod 的yaml 檔案
┌──[root@vms100.liruilongs.github.io]-[~]
└─$mv /etc/kubernetes/manifests/{etcd.yaml,kube-apiserver.yaml} /tmp/
刪除etcd資料目錄
┌──[root@vms100.liruilongs.github.io]-[~]
└─$rm -rf /var/lib/etcd/*
確認節點 的 etcd 和 apiservier 都已經停止
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep apiserver
kube-system kube-apiserver-vms101.liruilongs.github.io 1/1 Running 272 (4h15m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms102.liruilongs.github.io 1/1 Running 246 (4h15m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep etcd
kube-system etcd-vms101.liruilongs.github.io 1/1 Running 167 (4h15m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system etcd-vms102.liruilongs.github.io 1/1 Running 173 (4h15m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
獲取故障節點 ID,下面的操作我們在健康的 etcd 節點執行，或者可以修改 --endpoints
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://192.168.26.101:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member list -w table
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ee392e5273e89e2 | started | vms100.liruilongs.github.io | https://192.168.26.100:2380 | https://192.168.26.100:2379 |
| 70059e836d19883d | started | vms101.liruilongs.github.io | https://192.168.26.101:2380 | https://192.168.26.101:2379 |
| b8cb9f66c2e63b91 | started | vms102.liruilongs.github.io | https://192.168.26.102:2380 | https://192.168.26.102:2379 |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
移除故障節點
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member remove ee392e5273e89e2
Member ee392e5273e89e2 removed from cluster 4816f346663d82a7
重新新增
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member add vms100.liruilongs.github.io --peer-urls=https://192.168.26.100:2380
Member 456f71fdc1ad9917 added to cluster 4816f346663d82a7
ETCD_NAME="vms100.liruilongs.github.io"
ETCD_INITIAL_CLUSTER="vms100.liruilongs.github.io=https://192.168.26.100:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380,vms102.liruilongs.github.io=https://192.168.26.102:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.26.100:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
回到 100 節點機器,移動 Yaml 檔案，恢復節點
┌──[root@vms100.liruilongs.github.io]-[~]
└─$mv /tmp/{etcd.yaml,kube-apiserver.yaml} /etc/kubernetes/manifests/
確認 Pod 狀態
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep etcd
kube-system etcd-vms100.liruilongs.github.io 1/1 Running 0 16s 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system etcd-vms101.liruilongs.github.io 1/1 Running 167 (4h32m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system etcd-vms102.liruilongs.github.io 1/1 Running 173 (4h32m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep apiserver
kube-system kube-apiserver-vms100.liruilongs.github.io 1/1 Running 0 24s 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms101.liruilongs.github.io 1/1 Running 272 (4h32m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms102.liruilongs.github.io 1/1 Running 246 (4h32m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
檢視 etcd 叢集狀態
┌──[root@vms101.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member list -w table
+------------------+-----------+-----------------------------+-----------------------------+-----------------------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS |
+------------------+-----------+-----------------------------+-----------------------------+-----------------------------+
| 54952f3b494c0286 | unstarted | | https://192.168.26.100:2380 | |
| 70059e836d19883d | started | vms101.liruilongs.github.io | https://192.168.26.101:2380 | https://192.168.26.101:2379 |
| b8cb9f66c2e63b91 | started | vms102.liruilongs.github.io | https://192.168.26.102:2380 | https://192.168.26.102:2379 |
+------------------+-----------+-----------------------------+-----------------------------+-----------------------------+
這裡我們發現 新新增的節點狀態不正常，一直是 unstarted
我們在 故障節點執行 etcd 命令。發現故障節點並沒有新增到叢集，而是作為一個單節點執行。
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member list -w table
+-----------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS |
+-----------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ee392e5273e89e2 | started | vms100.liruilongs.github.io | https://192.168.26.100:2380 | https://192.168.26.100:2379 |
+-----------------+---------+-----------------------------+-----------------------------+-----------------------------+
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" endpoint status --cluster -w table
+-----------------------------+-----------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+-----------------------------+-----------------+---------+---------+-----------+-----------+------------+
| https://192.168.26.100:2379 | ee392e5273e89e2 | 3.5.4 | 815 kB | true | 2 | 2261 |
+-----------------------------+-----------------+---------+---------+-----------+-----------+------------+
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
也沒有同步 當前叢集的資料
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide --server=https://vms100.liruilongs.github.io:6443
No resources found
遇到這種情況，大部分原因是 某個節點的 etcd配置檔案的問題，我的這個問題是 故障節點的 etcd 配置檔案，沒有叢集資訊相關配置，所以這裡把叢集相關配置寫入配置
原本的配置檔案
┌──[root@vms100.liruilongs.github.io]-[~]
└─$cat /etc/kubernetes/manifests/etcd.yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
kubeadm.kubernetes.io/etcd.advertise-client-urls: https://192.168.26.100:2379
creationTimestamp: null
labels:
component: etcd
tier: control-plane
name: etcd
namespace: kube-system
spec:
containers:
- command:
- etcd
- --advertise-client-urls=https://192.168.26.100:2379
- --cert-file=/etc/kubernetes/pki/etcd/server.crt
- --client-cert-auth=true
- --data-dir=/var/lib/etcd
- --experimental-initial-corrupt-check=true
- --experimental-watch-progress-notify-interval=5s
- --initial-advertise-peer-urls=https://192.168.26.100:2380
- --initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380
- --key-file=/etc/kubernetes/pki/etcd/server.key
- --listen-client-urls=https://127.0.0.1:2379,https://192.168.26.100:2379
- --listen-metrics-urls=http://127.0.0.1:2381
- --listen-peer-urls=https://192.168.26.100:2380
- --name=vms100.liruilongs.github.io
- --peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt
- --peer-client-cert-auth=true
- --peer-key-file=/etc/kubernetes/pki/etcd/peer.key
- --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
- --snapshot-count=10000
- --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
image: registry.aliyuncs.com/google_containers/etcd:3.5.4-0
。。。。。。。。。。。。。。。。
叢集資訊不全的，新增後的配置檔案
┌──[root@vms100.liruilongs.github.io]-[~]
└─$cat /etc/kubernetes/manifests/etcd.yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
kubeadm.kubernetes.io/etcd.advertise-client-urls: https://192.168.26.100:2379
creationTimestamp: null
labels:
component: etcd
tier: control-plane
name: etcd
namespace: kube-system
spec:
containers:
- command:
- etcd
- --advertise-client-urls=https://192.168.26.100:2379
- --cert-file=/etc/kubernetes/pki/etcd/server.crt
- --client-cert-auth=true
- --data-dir=/var/lib/etcd
- --experimental-initial-corrupt-check=true
- --experimental-watch-progress-notify-interval=5s
- --initial-advertise-peer-urls=https://192.168.26.100:2380
- --initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380
- --initial-cluster-state=existing
- --key-file=/etc/kubernetes/pki/etcd/server.key
- --listen-client-urls=https://127.0.0.1:2379,https://192.168.26.100:2379
- --listen-metrics-urls=http://127.0.0.1:2381
- --listen-peer-urls=https://192.168.26.100:2380
- --name=vms100.liruilongs.github.io
- --peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt
- --peer-client-cert-auth=true
- --peer-key-file=/etc/kubernetes/pki/etcd/peer.key
- --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
- --snapshot-count=10000
- --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
然後我們以上面相同的方式從新恢復一次，發現節點直接沒有起來
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep apiserver
kube-system kube-apiserver-vms100.liruilongs.github.io 0/1 CrashLoopBackOff 1 (18s ago) 39s 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms101.liruilongs.github.io 1/1 Running 272 (5h29m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system kube-apiserver-vms102.liruilongs.github.io 1/1 Running 246 (5h29m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl get pod -A -o wide | grep etcd
kube-system etcd-vms100.liruilongs.github.io 0/1 CrashLoopBackOff 3 (21s ago) 53s 192.168.26.100 vms100.liruilongs.github.io <none> <none>
kube-system etcd-vms101.liruilongs.github.io 1/1 Running 167 (5h29m ago) 415d 192.168.26.101 vms101.liruilongs.github.io <none> <none>
kube-system etcd-vms102.liruilongs.github.io 1/1 Running 173 (5h29m ago) 415d 192.168.26.102 vms102.liruilongs.github.io <none> <none>
檢視日誌
┌──[root@vms100.liruilongs.github.io]-[~]
└─$kubectl logs etcd-vms100.liruilongs.github.io -n kube-system
.............................
{"level":"fatal","ts":"2024-03-16T16:25:19.981Z","caller":"etcdmain/etcd.go:204","msg":"discovery failed","error":"error validating peerURLs {ClusterID:4816f346663d82a7 Members:[&{ID:b8cb9f66c2e63b91 RaftAttributes:{PeerURLs:[https://192.168.26.102:2380] IsLearner:false} Attributes:{Name:vms102.liruilongs.github.io ClientURLs:[https://192.168.26.102:2379]}} &{ID:3fbbbed942c51f7b RaftAttributes:{PeerURLs:[https://192.168.26.100:2380] IsLearner:false} Attributes:{Name: ClientURLs:[]}} &{ID:70059e836d19883d RaftAttributes:{PeerURLs:[https://192.168.26.101:2380] IsLearner:false} Attributes:{Name:vms101.liruilongs.github.io ClientURLs:[https://192.168.26.101:2379]}}] RemovedMemberIDs:[]}: member count is unequal","stacktrace":"go.etcd.io/etcd/server/v3/etcdmain.startEtcdOrProxyV2\n\t/go/src/go.etcd.io/etcd/release/etcd/server/etcdmain/etcd.go:204\ngo.etcd.io/etcd/server/v3/etcdmain.Main\n\t/go/src/go.etcd.io/etcd/release/etcd/server/etcdmain/main.go:40\nmain.main\n\t/go/src/go.etcd.io/etcd/release/etcd/server/main.go:32\nruntime.main\n\t/go/gos/go1.16.15/src/runtime/proc.go:225"}
根據日誌資訊，可以看到有用的資訊 RemovedMemberIDs:[]}: member count is unequal ,成員數量不相等,在分析日誌
{
"level": "info",
"ts": "2024-03-16T16:25:19.961Z",
"caller": "etcdmain/etcd.go:73",
"msg": "Running: ",
"args": [
"etcd",
"--advertise-client-urls=https://192.168.26.100:2379",
"--cert-file=/etc/kubernetes/pki/etcd/server.crt",
"--client-cert-auth=true",
"--data-dir=/var/lib/etcd",
"--experimental-initial-corrupt-check=true",
"--experimental-watch-progress-notify-interval=5s",
"--initial-advertise-peer-urls=https://192.168.26.100:2380",
"--initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380",
"--initial-cluster-state=existing",
"--key-file=/etc/kubernetes/pki/etcd/server.key",
"--listen-client-urls=https://127.0.0.1:2379,https://192.168.26.100:2379",
"--listen-metrics-urls=http://127.0.0.1:2381",
"--listen-peer-urls=https://192.168.26.100:2380",
"--name=vms100.liruilongs.github.io",
"--peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt",
"--peer-client-cert-auth=true",
"--peer-key-file=/etc/kubernetes/pki/etcd/peer.key",
"--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt",
"--snapshot-count=10000",
"--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt"
]
}
..............................................................................
{
"level": "warn",
"ts": "2024-03-16T16:25:19.981Z",
"caller": "etcdmain/etcd.go:146",
"msg": "failed to start etcd",
"error": "error validating peerURLs {ClusterID:4816f346663d82a7 Members:[&{ID:b8cb9f66c2e63b91 RaftAttributes:{PeerURLs:[https://192.168.26.102:2380] IsLearner:false} Attributes:{Name:vms102.liruilongs.github.io ClientURLs:[https://192.168.26.102:2379]}} &{ID:3fbbbed942c51f7b RaftAttributes:{PeerURLs:[https://192.168.26.100:2380] IsLearner:false} Attributes:{Name: ClientURLs:[]}} &{ID:70059e836d19883d RaftAttributes:{PeerURLs:[https://192.168.26.101:2380] IsLearner:false} Attributes:{Name:vms101.liruilongs.github.io ClientURLs:[https://192.168.26.101:2379]}}] RemovedMemberIDs:[]}: member count is unequal"
}
{
"level": "fatal",
"ts": "2024-03-16T16:25:19.981Z",
"caller": "etcdmain/etcd.go:204",
"msg": "discovery failed",
"error": "error validating peerURLs {ClusterID:4816f346663d82a7 Members:[&{ID:b8cb9f66c2e63b91 RaftAttributes:{PeerURLs:[https://192.168.26.102:2380] IsLearner:false} Attributes:{Name:vms102.liruilongs.github.io ClientURLs:[https://192.168.26.102:2379]}} &{ID:3fbbbed942c51f7b RaftAttributes:{PeerURLs:[https://192.168.26.100:2380] IsLearner:false} Attributes:{Name: ClientURLs:[]}} &{ID:70059e836d19883d RaftAttributes:{PeerURLs:[https://192.168.26.101:2380] IsLearner:false} Attributes:{Name:vms101.liruilongs.github.io ClientURLs:[https://192.168.26.101:2379]}}] RemovedMemberIDs:[]}: member count is unequal",
"stacktrace": "go.etcd.io/etcd/server/v3/etcdmain.startEtcdOrProxyV2\n\t/go/src/go.etcd.io/etcd/release/etcd/server/etcdmain/etcd.go:204\ngo.etcd.io/etcd/server/v3/etcdmain.Main\n\t/go/src/go.etcd.io/etcd/release/etcd/server/etcdmain/main.go:40\nmain.main\n\t/go/src/go.etcd.io/etcd/release/etcd/server/main.go:32\nruntime.main\n\t/go/gos/go1.16.15/src/runtime/proc.go:225"
}
可以看到它提示 可能錯誤與 vms102.liruilongs.github.io 節點相關
然後我們看一下 vms102.liruilongs.github.io 的配置檔案
┌──[root@vms102.liruilongs.github.io]-[~]
└─$cat /etc/kubernetes/manifests/etcd.yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
kubeadm.kubernetes.io/etcd.advertise-client-urls: https://192.168.26.102:2379
creationTimestamp: null
labels:
component: etcd
tier: control-plane
name: etcd
namespace: kube-system
spec:
containers:
- command:
- etcd
- --advertise-client-urls=https://192.168.26.102:2379
- --cert-file=/etc/kubernetes/pki/etcd/server.crt
- --client-cert-auth=true
- --data-dir=/var/lib/etcd
- --experimental-initial-corrupt-check=true
- --experimental-watch-progress-notify-interval=5s
- --initial-advertise-peer-urls=https://192.168.26.102:2380
- --initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380,vms102.liruilongs.github.io=https://192.168.26.102:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380
- --initial-cluster-state=existing
- --key-file=/etc/kubernetes/pki/etcd/server.key
- --listen-client-urls=https://127.0.0.1:2379,https://192.168.26.102:2379
- --listen-metrics-urls=http://127.0.0.1:2381
- --listen-peer-urls=https://192.168.26.102:2380
- --name=vms102.liruilongs.github.io
- --peer-cert-file=/etc/kubernetes/pki/etcd/peer.crt
- --peer-client-cert-auth=true
- --peer-key-file=/etc/kubernetes/pki/etcd/peer.key
- --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
- --snapshot-count=10000
- --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.crt
透過配置檔案比對，可以發現，之前配置的故障節點的配置任然有問題，少了一個vms102.liruilongs.github.io=https://192.168.26.102:2380節點資訊。
"--initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380",
"--initial-cluster=vms100.liruilongs.github.io=https://192.168.26.100:2380,vms102.liruilongs.github.io=https://192.168.26.102:2380,vms101.liruilongs.github.io=https://192.168.26.101:2380"
修改完配置，按照上面相同的流程重新恢復節點， 節點恢復
透過 etcdctl 命令檢查
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" member list -w table
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
| 70059e836d19883d | started | vms101.liruilongs.github.io | https://192.168.26.101:2380 | https://192.168.26.101:2379 |
| ac5f6045dbe477b3 | started | vms100.liruilongs.github.io | https://192.168.26.100:2380 | https://192.168.26.100:2379 |
| b8cb9f66c2e63b91 | started | vms102.liruilongs.github.io | https://192.168.26.102:2380 | https://192.168.26.102:2379 |
+------------------+---------+-----------------------------+-----------------------------+-----------------------------+
┌──[root@vms100.liruilongs.github.io]-[~]
└─$ETCDCTL_API=3 etcdctl --endpoints https://127.0.0.1:2379 --cert="/etc/kubernetes/pki/etcd/server.crt" --key="/etc/kubernetes/pki/etcd/server.key" --cacert="/etc/kubernetes/pki/etcd/ca.crt" endpoint status --cluster -w table
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
| https://192.168.26.101:2379 | 70059e836d19883d | 3.5.4 | 88 MB | false | 603 | 22227327 |
| https://192.168.26.100:2379 | ac5f6045dbe477b3 | 3.5.4 | 88 MB | false | 603 | 22227327 |
| https://192.168.26.102:2379 | b8cb9f66c2e63b91 | 3.5.4 | 88 MB | true | 603 | 22227327 |
+-----------------------------+------------------+---------+---------+-----------+-----------+------------+
┌──[root@vms100.liruilongs.github.io]-[~]
└─$
故障節點恢復，在實際的操作中，新增完節點，我們需要確認故障節點的配置檔案是否是正確的配置檔案
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