master 上查看 node 状态，可见 devops010012007114 状态为 NotReady：
[app@devops010012007068 zhanglin]<20250120 14:26:35>$ k get nodes
NAME STATUS ROLES AGE VERSION
devops010012007068 Ready master 3y240d v1.19.8+k3s1
devops010012007069 Ready <none> 288d v1.19.8+k3s1
devops010012007070 Ready <none> 3y240d v1.19.8+k3s1
devops010012007071 Ready <none> 3y240d v1.19.8+k3s1
devops010012007073 Ready <none> 3y240d v1.19.8+k3s1
devops010012007109 Ready <none> 542d v1.19.8+k3s1
devops010012007111 Ready <none> 542d v1.19.8+k3s1
devops010012007113 Ready <none> 542d v1.19.8+k3s1
devops010012007114 NotReady <none> 207d v1.19.8+k3s1
devops010012007116 Ready <none> 542d v1.19.8+k3s1
node devops010012007114 上查看 k3s-agent 状态，有报错：
[root@localhost app]# systemctl status k3s-agent -l
● k3s-agent.service - Lightweight Kubernetes
Loaded: loaded (/etc/systemd/system/k3s-agent.service; enabled; vendor preset: disabled)
Active: active (running) since Mon 2025-01-20 12:20:21 CST; 2h 8min ago
Docs: https://k3s.io
Process: 9197 ExecStartPre=/sbin/modprobe overlay (code=exited, status=0/SUCCESS)
Process: 9167 ExecStartPre=/sbin/modprobe br_netfilter (code=exited, status=0/SUCCESS)
Process: 9148 ExecStartPre=/bin/sh -xc ! /usr/bin/systemctl is-enabled --quiet nm-cloud-setup.service (code=exited, status=0/SUCCESS)
Main PID: 9209 (k3s-agent)
Tasks: 10
Memory: 122.8M
CGroup: /system.slice/k3s-agent.service
└─9209 /usr/local/bin/k3s agent
Jan 20 14:27:55 localhost.localdomain k3s[9209]: time="2025-01-20T14:27:55.207578649+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:00 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:00.220559879+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:05 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:05.233453150+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:10 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:10.246519473+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:15 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:15.259321936+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:20 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:20.272576559+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:25 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:25.285244932+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:30 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:30.297600069+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:35 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:35.313884545+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:40 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:40.326131507+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
使用 journalctl 也可查看 log：
[root@localhost app]# journalctl -u k3s-agent -f
-- Logs begin at Mon 2025-01-20 12:20:12 CST. --
Jan 20 14:28:10 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:10.246519473+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:15 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:15.259321936+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:20 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:20.272576559+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:25 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:25.285244932+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:30 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:30.297600069+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:35 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:35.313884545+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:40 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:40.326131507+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:45 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:45.339057664+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:50 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:50.352345609+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:28:55 localhost.localdomain k3s[9209]: time="2025-01-20T14:28:55.364271075+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
Jan 20 14:29:00 localhost.localdomain k3s[9209]: time="2025-01-20T14:29:00.377075556+08:00" level=error msg="Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag"
其中的报错：
Failed to retrieve agent config: Node password rejected, duplicate hostname or contents of '/etc/rancher/node/password' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag
曾把我引入歧途，我一直以为是密码错误，或者是缺乏 --with-node-id flag。
但是注意到 or contents of '/etc/rancher/node/password' may not match server node-passwd entry，且发现 [root@localhost app]# hostname 是 localhost，
联想到服务器曾重启，hostname 好像被恢复成了默认，似乎重置 hostname 可能有用。
于是尝试：
[root@localhost app]# hostname devops010012007114
重启后：
[root@devops010012007114 app]#
此时注意到 hostname 已变为 devops010012007114。
然后回到 master 上查看状态，果然恢复了：
[app@devops010012007068 zhanglin]<20250120 14:29:36>$ k get nodes
NAME STATUS ROLES AGE VERSION
devops010012007068 Ready master 3y240d v1.19.8+k3s1
devops010012007069 Ready <none> 288d v1.19.8+k3s1
devops010012007070 Ready <none> 3y240d v1.19.8+k3s1
devops010012007071 Ready <none> 3y240d v1.19.8+k3s1
devops010012007073 Ready <none> 3y240d v1.19.8+k3s1
devops010012007109 Ready <none> 542d v1.19.8+k3s1
devops010012007111 Ready <none> 542d v1.19.8+k3s1
devops010012007113 Ready <none> 542d v1.19.8+k3s1
devops010012007114 Ready <none> 207d v1.19.8+k3s1
devops010012007116 Ready <none> 542d v1.19.8+k3s1
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