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k8s_yaml/kubectl 命令/查看pod日志.md
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k8s_yaml/kubectl 命令/查看pod日志.md
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## 对应关系总结
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| Linux 命令 | kubectl logs 等效命令 |
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|---------------:|---------------------|
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| cat logfile | `kubectl logs <pod-name>` |
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| tail -n 10 | `kubectl logs --tail=10 <pod-name>` |
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| tail -f | `kubectl logs -f <pod-name>` |
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| head -n 10 | `kubectl logs --tail=1000 <pod-name> \| head -n 10` |
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| grep "error" | `kubectl logs <pod-name> \| grep "error"` |
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> 说明:`head` 在 kubectl 中没有直接等价参数,常用方法是获取较多末尾行再用 `head` 截取,或在集群外使用日志聚合/查询工具。
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## 查看 Pod 日志(示例:pod=test-flymoon-admin-deployment-964fb6b74-ns4br,namespace=`test-lessie`)
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显示所有日志内容(等同于 cat)
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```bash
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kubectl logs test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看最后 10 行(等同于 tail -n 10)
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```bash
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kubectl logs --tail=10 test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看最后 50 行
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```bash
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kubectl logs --tail=50 test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看前 10 行(等同于 head -n 10)
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```bash
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kubectl logs --tail=1000 test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie | head -n 10
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```
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实时跟踪日志(等同于 tail -f)
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```bash
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kubectl logs -f test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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从最后 10 行开始实时跟踪
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```bash
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kubectl logs -f --tail=10 test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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实时跟踪并显示时间戳
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```bash
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kubectl logs -f --timestamps test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看最近 1 小时的日志
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```bash
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kubectl logs --since=1h test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看最近 10 分钟的日志
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```bash
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kubectl logs --since=10m test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看指定时间以来的日志(使用 RFC3339 时间格式)
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```bash
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kubectl logs --since=2024-01-15T10:00:00Z test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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查看之前实例的日志(Pod 重启后)
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```bash
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kubectl logs --previous test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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只查看特定容器的日志(Pod 有多个容器时)
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```bash
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kubectl logs -c <container-name> test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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带时间戳显示
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```bash
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kubectl logs --timestamps test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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限制日志字节数
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```bash
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kubectl logs --limit-bytes=10240 test-flymoon-admin-deployment-964fb6b74-ns4br -n test-lessie
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```
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