【配置建议】Categraf采集k8s信息，配置项优化

[sunFlying]

部署后，注意到k8s采集信息失败，排查categraf日志发现，
input.kubernetes等k8s信息采集，配置中的kubelet配置为127.0.0.1，无法访问；

2024/12/17 02:52:55 instances.go:227: E! failed to query url: https://127.0.0.1:10250/metrics/cadvisor error: Get "https://127.0.0.1:10250/metrics/cadvisor": dial tcp 127.0.0.1:10250: connect: connection refused
2024/12/17 02:52:55 prometheus.go:227: E! failed to query url: https://127.0.0.1:10250/metrics error: Get "https://127.0.0.1:10250/metrics": dial tcp 127.0.0.1:10250: connect: connection refused
2024/12/17 02:53:10 kubernetes.go:113: E! failed to load https://127.0.0.1:10250/stats/summary error: error making HTTP request to https://127.0.0.1:10250/stats/summary: dial tcp 127.0.0.1:10250: connect: connection refused

集群kubelet不允许127.0.0.1访问,

[root@xcmgt01 n9e-helm]# netstat -tunlp |grep 10250
tcp        0      0 172.30.31.15:10250      0.0.0.0:*               LISTEN      1809/kubelet
[root@xcmgt01 n9e-helm]# curl https://127.0.0.1:10250
curl: (7) Failed to connect to 127.0.0.1 port 10250: 拒绝连接
[root@xcmgt01 n9e-helm]# curl https://172.30.31.15:10250
404 page not found

[root@xcmgt01 n9e-helm]# curl https://127.0.0.1:10250/metrics/cadvisor
curl: (7) Failed to connect to 127.0.0.1 port 10250: 拒绝连接
[root@xcmgt01 n9e-helm]# curl https://172.30.31.15:10250/metrics/cadvisor

建议添加注释，或优化为以下配置，提供遇到同样问题时的解决方案
${HOSTIP}为Categraf的pod自带的环境变量，完美解决了我的问题

# URL for the kubelet
url = "https://${HOSTIP}:10250"

[root@xcmgt01 n9e-helm]# kubectl exec -it  nightingale-categraf-v6-wkgj9 -n n9e  -- printenv | grep HOSTIP
HOSTIP=172.30.31.46

[root@xcmgt01 n9e-helm]# kubectl exec -it  nightingale-categraf-v6-wkgj9 -n n9e  -- printenv | grep 172.30
HOSTIP=172.30.31.46

[kongfei605]

感谢反馈，HOSTIP确实就是这么用的 ，有些公有云不允许直接用127访问。
https://github.com/flashcatcloud/categraf/blob/main/k8s/daemonset.yaml#L527