kubernetes: pod重启前的日志查看

2023-11-25 15:12| 来源: 网络整理| 查看: 265

背景： pod重启会杀掉容器，如果要追踪问题原因， kuberctl logs 看到的是当前的容器日志，那怎么查看杀掉前的容器日志呢？知识点：我们看一下 logs字命令

[root@myserver ~]# kubectl logs -h Print the logs for a container in a pod or specified resource. If the pod has only one container, the container name is optional. Examples: # Return snapshot logs from pod nginx with only one container kubectl logs nginx # Return snapshot logs from pod nginx with multi containers kubectl logs nginx --all-containers=true # Return snapshot logs from all containers in pods defined by label app=nginx kubectl logs -lapp=nginx --all-containers=true # Return snapshot of previous terminated ruby container logs from pod web-1 kubectl logs -p -c ruby web-1 # Begin streaming the logs of the ruby container in pod web-1 kubectl logs -f -c ruby web-1 # Begin streaming the logs from all containers in pods defined by label app=nginx kubectl logs -f -lapp=nginx --all-containers=true # Display only the most recent 20 lines of output in pod nginx kubectl logs --tail=20 nginx # Show all logs from pod nginx written in the last hour kubectl logs --since=1h nginx # Return snapshot logs from first container of a job named hello kubectl logs job/hello # Return snapshot logs from container nginx-1 of a deployment named nginx kubectl logs deployment/nginx -c nginx-1 Options: --all-containers=false: Get all containers' logs in the pod(s). -c, --container='': Print the logs of this container -f, --follow=false: Specify if the logs should be streamed. --ignore-errors=false: If watching / following pod logs, allow for any errors that occur to be non-fatal --limit-bytes=0: Maximum bytes of logs to return. Defaults to no limit. --max-log-requests=5: Specify maximum number of concurrent logs to follow when using by a selector. Defaults to 5. --pod-running-timeout=20s: The length of time (like 5s, 2m, or 3h, higher than zero) to wait until at least one pod is running -p, --previous=false: If true, print the logs for the previous instance of the container in a pod if it exists. -l, --selector='': Selector (label query) to filter on. --since=0s: Only return logs newer than a relative duration like 5s, 2m, or 3h. Defaults to all logs. Only one of since-time / since may be used. --since-time='': Only return logs after a specific date (RFC3339). Defaults to all logs. Only one of since-time / since may be used. --tail=-1: Lines of recent log file to display. Defaults to -1 with no selector, showing all log lines otherwise 10, if a selector is provided. --timestamps=false: Include timestamps on each line in the log output Usage: kubectl logs [-f] [-p] (POD | TYPE/NAME) [-c CONTAINER] [options] Use "kubectl options" for a list of global command-line options (applies to all commands). [root@myserver ~]#

从上面我们那可以看到，-p参数可以查看前一个容器的日志信息或者可以使用 --previous=true

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