# Unable to access \`metrics\` information on CentOS 9 Stream **URL:** \ **Category:** node\_exporter\ **Created:** [April 18, 2022, 8:59am UTC](https://discuss.prometheus.io/t/unable-to-access-metrics-information-on-centos-9-stream/912 "2022-04-18T08:59:02Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![linghengqian](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.prometheus.io/linghengqian/32/411_2.png) [@linghengqian](https://discuss.prometheus.io/u/linghengqian)\ **Post date:** [April 18, 2022, 8:59am UTC](https://discuss.prometheus.io/t/unable-to-access-metrics-information-on-centos-9-stream/912/1 "2022-04-18T08:59:02Z")
### Host operating system: output of `uname -a` - I’m actually running Node Exporter inside Docker, so I’m printing system info outside the container. ```shell Linux node1 5.14.0-39.el9.x86_64 #1 SMP PREEMPT Fri Dec 24 04:03:40 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ``` ### node\_exporter version: output of `node_exporter --version` ```shell node_exporter, version 1.3.1 (branch: HEAD, revision: a2321e7b940ddcff26873612bccdf7cd4c42b6b6) build user: root@243aafa5525c build date: 20211205-11:09:49 go version: go1.17.3 platform: linux/amd64 ``` ### node\_exporter command line flags ```shell ts=2022-04-17T12:50:01.180Z caller=node_exporter.go:182 level=info msg="Starting node_exporter" version="(version=1.3.1, branch=HEAD, revision=a2321e7b940ddcff26873612bccdf7cd4c42b6b6)" ts=2022-04-17T12:50:01.180Z caller=node_exporter.go:183 level=info msg="Build context" build_context="(go=go1.17.3, user=root@243aafa5525c, date=20211205-11:09:49)" ts=2022-04-17T12:50:01.182Z caller=filesystem_common.go:111 level=info collector=filesystem msg="Parsed flag --collector.filesystem.mount-points-exclude" flag=^/(dev|proc|run/credentials/.+|sys|var/lib/docker/.+)($|/) ts=2022-04-17T12:50:01.182Z caller=filesystem_common.go:113 level=info collector=filesystem msg="Parsed flag --collector.filesystem.fs-types-exclude" flag=^(autofs|binfmt_misc|bpf|cgroup2?|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|iso9660|mqueue|nsfs|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|selinuxfs|squashfs|sysfs|tracefs)$ ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:108 level=info msg="Enabled collectors" ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=arp ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=bcache ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=bonding ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=btrfs ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=conntrack ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=cpu ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=cpufreq ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=diskstats ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=dmi ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=edac ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=entropy ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=fibrechannel ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=filefd ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=filesystem ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=hwmon ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=infiniband ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=ipvs ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=loadavg ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=mdadm ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=meminfo ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=netclass ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=netdev ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=netstat ts=2022-04-17T12:50:01.184Z caller=node_exporter.go:115 level=info collector=nfs ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=nfsd ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=nvme ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=os ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=powersupplyclass ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=pressure ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=rapl ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=schedstat ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=sockstat ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=softnet ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=stat ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=tapestats ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=textfile ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=thermal_zone ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=time ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=timex ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=udp_queues ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=uname ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=vmstat ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=xfs ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:115 level=info collector=zfs ts=2022-04-17T12:50:01.185Z caller=node_exporter.go:199 level=info msg="Listening on" address=:9100 ts=2022-04-17T12:50:01.186Z caller=tls_config.go:195 level=info msg="TLS is disabled." http2=false ``` ### Are you running node\_exporter in Docker? - Yes. ### What did you do that produced an error? - When I run `busybox wget http://localhost:9100/metrics` inside the container. I am attaching my `docker-compose.yml` below. ```yaml version: "3.8" services: node-exporter: image: prom/node-exporter:v1.3.1 hostname: node-exporter.lingh.com command: - '--path.rootfs=/host' network_mode: host pid: host restart: unless-stopped ports: - "9100:9100" volumes: - '/:/host:ro,rslave' ``` ### What did you expect to see? - I expect to see some log, something like ```shell go_gc_duration_seconds{quantile="0"} 7.7777e-05 go_gc_duration_seconds{quantile="0.25"} 0.000113756 go_gc_duration_seconds{quantile="0.5"} 0.000127199 go_gc_duration_seconds{quantile="0.75"} 0.000147778 go_gc_duration_seconds{quantile="1"} 0.000371894 go_gc_duration_seconds_sum 0.292994058 go_gc_duration_seconds_count 2029 ``` ### What did you see instead? - Error message from wget that I don’t have permission to access `metrics`. ```shell / $ busybox wget http://localhost:9100/metrics Connecting to localhost:9100 (127.0.0.1:9100) wget: can't open 'metrics': Permission denied ``` - ![image](https://europe1.discourse-cdn.com/flex017/uploads/prometheus/original/1X/eb9736f88be8c518fed5b69a6227bf5397b57f50.png) ---
**Author:** ![linghengqian](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.prometheus.io/linghengqian/32/411_2.png) [@linghengqian](https://discuss.prometheus.io/u/linghengqian)\ **Post date:** [April 24, 2022, 9:55am UTC](https://discuss.prometheus.io/t/unable-to-access-metrics-information-on-centos-9-stream/912/2 "2022-04-24T09:55:51Z")
Sorry I misunderstood the meaning of `network_mode: host` in `docker-compose.yml`. After removing `network_mode: host`, the actual data flow to `otel/opentelemetry-collector` normally. Go to [Deployment section of the documentation for Docker Compose should indicate more information about `network_mode` · Issue #2355 · prometheus/node\_exporter · GitHub](https://github.com/prometheus/node_exporter/issues/2355). ---
**Author:** ![SuperQ](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.prometheus.io/superq/32/4_2.png) [@SuperQ](https://discuss.prometheus.io/u/SuperQ)\ **Post date:** [April 24, 2022, 4:06pm UTC](https://discuss.prometheus.io/t/unable-to-access-metrics-information-on-centos-9-stream/912/3 "2022-04-24T16:06:50Z")
> [@linghengqian](#): > > ```auto > / $ busybox wget http://localhost:9100/metrics > Connecting to localhost:9100 (127.0.0.1:9100) > wget: can't open 'metrics': Permission denied > > ``` You’re trying to use wget inside a container. The error is because wget can’t write out the file named “metrics” because the filesystem in the container is read-only. This has nothing to do with network mode or opentelemetry. ---
**Author:** ![linghengqian](https://dub1.discourse-cdn.com/flex017/user_avatar/discuss.prometheus.io/linghengqian/32/411_2.png) [@linghengqian](https://discuss.prometheus.io/u/linghengqian)\ **Post date:** [April 24, 2022, 11:18pm UTC](https://discuss.prometheus.io/t/unable-to-access-metrics-information-on-centos-9-stream/912/4 "2022-04-24T23:18:05Z")
@SuperQ I verified the `network_mode` problem on node\_exporter -\>opentelemetry-collector-\>SkyWalking OAP Server-\>SkyWalking UI. This is not difficult, I can provide a verified `docker-comemess.yml` in the issue or here if necessary.