Kubernetes日志路径

Kubernetes日志路径配置

Kubernetes各组件默认不将日志输出到文件，可能是不好控制吧，默认只输出到控制台

kubelet

1. 具体配置如下，kuberlet.service.d/10-kubeadm.conf

   一共四个环境变量，真是吃饱撑得没事做，可能是为了功能更明确一点吧

   具体日志修改的变量在/etc/sysconfig/kubelet文件中，如下 （--v=5 是日志级别的定义等级包含了debug模式，有助于在排错的，正常运行可以关闭）

   二个参数：--logtostderr默认是true代表输出到控制台上，--log-dir默认是空，代表输出到控制台上，亲测如果需要输出到文件中，目录必须是/var/log/kubernetes，如果有朋友测试其它的目录可以，告诉一下

   <root@HK-K8S-WN4 /usr/lib/systemd/system/kubelet.service.d># cat 10-kubeadm.conf 
   # Note: This dropin only works with kubeadm and kubelet v1.11+
   [Service]
   Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
   Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
   # This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
   EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
   # This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
   # the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
   EnvironmentFile=-/etc/sysconfig/kubelet
   ExecStart=
   ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

2. 重启服务

   systemctl daemon-reload && systemctl start kubelet.service

   切换至具体的日志目录 /var/log/kubernetes，查看如下

   <root@HK-K8S-WN4 /var/log/kubernetes># ls -lrth
   total 23M
   -rw-r--r-- 1 root root  926 Aug 16 12:01 kubelet.HK-K8S-WN4.root.log.ERROR.20210816-120124.15011
   -rw-r--r-- 1 root root 1.6K Aug 16 12:01 kubelet.HK-K8S-WN4.root.log.WARNING.20210816-120117.15011
   -rw-r--r-- 1 root root  18K Aug 16 12:30 kubelet.HK-K8S-WN4.root.log.INFO.20210816-120117.15011
   lrwxrwxrwx 1 root root   54 Aug 16 12:30 kubelet.INFO -> kubelet.HK-K8S-WN4.root.log.INFO.20210816-123000.23141
   lrwxrwxrwx 1 root root   57 Aug 16 12:30 kubelet.WARNING -> kubelet.HK-K8S-WN4.root.log.WARNING.20210816-123001.23141
   lrwxrwxrwx 1 root root   55 Aug 16 12:30 kubelet.ERROR -> kubelet.HK-K8S-WN4.root.log.ERROR.20210816-123007.23141
   -rw-r--r-- 1 root root  926 Aug 16 12:30 kubelet.HK-K8S-WN4.root.log.ERROR.20210816-123007.23141
   -rw-r--r-- 1 root root 1.6K Aug 16 12:30 kubelet.HK-K8S-WN4.root.log.WARNING.20210816-123001.23141
   -rw-r--r-- 1 root root  23M Aug 16 14:24 kubelet.HK-K8S-WN4.root.log.INFO.20210816-123000.23141