Kubernetes - Failed to read textfile collector directory

[rohith vallabhaneni]

Hi 

I have a kubernetes cluster running in Amazon EKS, we are using the prometheus node-exporter docker image and running it as daemonset across all k8s nodes to fetch the node metrics. We had a use case to monitor the docker volumes usage on each node, I have written a shell script to fetch the data in the prometheus readable format

```

#! /bin/bash

hostip=$(curl -fs http://169.254.169.254/latest/meta-data/local-ipv4)

voulume_size=`df -Ph /var/lib/docker | awk '{if(NR>1)print $2}' | sed 's/G//g'`

voulume_usage=`df -Ph /var/lib/docker | awk '{if(NR>1)print $5}' | sed 's/%//g'`

`mkdir -p /home/ec2-user/node_exporter/textfile_collector`

`rm -f /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom`

echo "# HELP _docker_volume_usage hostip usage." >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

echo "# TYPE _docker_volume_usage gauge" >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

echo "_docker_volume_usage{hostip=\"$hostip\",host=\"`hostname`\"} $voulume_usage" >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

echo "# HELP _docker_volume_size hostip size." >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

echo "# TYPE _docker_volume_size gauge" >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

echo "_docker_volume_size{hostip=\"$hostip\",host=\"`hostname`\"} $voulume_size" >> /home/ec2-user/node_exporter/textfile_collector/docker_volume.prom 2>&1

```

I'm running the script on each node and adding the data to

/home/ec2-user/node_exporter/textfile_collector/docker_volume.prom file.

On the docker logs I see the below ERROR:

```

level=error ts=2021-01-21T08:44:45.125Z caller=textfile.go:197 collector=textfile msg="failed to read textfile collector directory" path=/home/ec2-user/node_exporter/textfile_collector err="open /home/ec2-user/node_exporter/textfile_collector: no such file or directory"

```

Let me know where am I going wrong, I now had a doubt that whether the textfile-collector from the docker container colect data from the node in which the container is running! 

Any help over here would be appreciated.

Thanks,

Rohith Vallabhaneni.