Kubernetes日志路徑配置
Kubernetes各組件默認不將日志輸出到文件，可能是不好控制吧，默認只輸出到控制台
kubelet
具體配置如下，kuberlet.service.d/10-kubeadm.conf
<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
一共四個環境變量，真是吃飽撐得沒事做，可能是為了功能更明確一點吧
具體日志修改的變量在/etc/sysconfig/kubelet文件中，如下 （--v=5 是日志級別的定義等級包含了debug模式，有助於在排錯的，正常運行可以關閉）
二個參數：--logtostderr默認是true代表輸出到控制台上，--log-dir默認是空，代表輸出到控制台上，親測如果需要輸出到文件中，目錄必須是/var/log/kubernetes，如果有朋友測試其它的目錄可以，告訴一下
<root@HK-K8S-WN4 /usr/lib/systemd/system/kubelet.service.d># cat /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS=--logtostderr=false --log-dir=/var/log/kubernetes --v=5
systemctl daemon-reload && systemctl start kubelet.service
切換至具體的日志目錄 /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