Failed to start influxdb 1.11.8

Hello,

I have some problem to start my influxdb 1.11.8 running on a Debian VM. It looks like that I have some invalid series index error:

× influxdb.service - InfluxDB is an open-source, distributed, time series database
     Loaded: loaded (/lib/systemd/system/influxdb.service; enabled; preset: enabled)
     Active: failed (Result: exit-code) since Sun 2025-08-03 17:47:08 CEST; 2min 37s ago
       Docs: https://docs.influxdata.com/influxdb/
    Process: 656 ExecStart=/usr/share/influxdb/scripts/influxd-systemd-start.sh (code=exited, status=1/FAILURE)
        CPU: 55ms

Aug 03 17:47:08 debian systemd[1]: influxdb.service: Control process exited, code=exited, status=1/FAILURE
Aug 03 17:47:08 debian systemd[1]: influxdb.service: Failed with result 'exit-code'.
Aug 03 17:47:08 debian systemd[1]: Failed to start influxdb.service - InfluxDB is an open-source, distributed, time series database.
Aug 03 17:47:08 debian systemd[1]: influxdb.service: Scheduled restart job, restart counter is at 5.
Aug 03 17:47:08 debian systemd[1]: Stopped influxdb.service - InfluxDB is an open-source, distributed, time series database.
Aug 03 17:47:08 debian systemd[1]: influxdb.service: Start request repeated too quickly.
Aug 03 17:47:08 debian systemd[1]: influxdb.service: Failed with result 'exit-code'.
Aug 03 17:47:08 debian systemd[1]: Failed to start influxdb.service - InfluxDB is an open-source, distributed, time series database.
root@debian:~# influx -version
InfluxDB shell version: v1.11.8
root@debian:~# sudo influxd

 8888888           .d888 888                   8888888b.  888888b.
   888            d88P"  888                   888  "Y88b 888  "88b
   888            888    888                   888    888 888  .88P
   888   88888b.  888888 888 888  888 888  888 888    888 8888888K.
   888   888 "88b 888    888 888  888  Y8bd8P' 888    888 888  "Y88b
   888   888  888 888    888 888  888   X88K   888    888 888    888
   888   888  888 888    888 Y88b 888 .d8""8b. 888  .d88P 888   d88P
 8888888 888  888 888    888  "Y88888 888  888 8888888P"  8888888P"

2025-08-03T13:51:59.255444Z	info	InfluxDB starting	{"log_id": "0y835y5l000", "version": "v1.11.8", "branch": "unknown", "commit": "199a607e1c7a5a687f96a636bb3bab9a61e4ae31"}
2025-08-03T13:51:59.255494Z	info	Go runtime	{"log_id": "0y835y5l000", "version": "go1.22.7", "maxprocs": 2}
2025-08-03T13:51:59.255542Z	info	configured logger	{"log_id": "0y835y5l001", "format": "auto", "level": "info"}
2025-08-03T13:51:59.257862Z	info	Using data dir	{"log_id": "0y835y5l000", "service": "store", "path": "/var/lib/influxdb/data"}
2025-08-03T13:51:59.257925Z	info	Compaction settings	{"log_id": "0y835y5l000", "service": "store", "max_concurrent_compactions": 1, "throughput_bytes_per_second": 50331648, "throughput_bytes_per_second_burst": 50331648}
2025-08-03T13:51:59.257973Z	info	Open store (start)	{"log_id": "0y835y5l000", "service": "store", "trace_id": "0y835y6G000", "op_name": "tsdb_open", "op_event": "start"}
2025-08-03T13:51:59.258105Z	error	Unable to open series file	{"log_id": "0y835y5l000", "path": "/var/lib/influxdb/data/_internal/_series", "partition": 0, "error": "invalid series index"}
2025-08-03T13:51:59.258163Z	info	Open store (end)	{"log_id": "0y835y5l000", "service": "store", "trace_id": "0y835y6G000", "op_name": "tsdb_open", "op_event": "end", "op_elapsed": "0.191ms"}
run: open server: open tsdb store: invalid series index
root@debian:~# influx_inspect verify-seriesfile -dir /var/lib/influxdb/data
2025-08-03T13:56:04.003792Z	error	Error opening index	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/_internal/_series", "partition": "00", "error": "invalid series index"}
2025-08-03T13:56:04.003900Z	error	Error opening segment	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/_internal/_series", "partition": "02", "segment": "0000", "error": "invalid series segment"}
2025-08-03T13:56:04.003993Z	error	Error opening segment	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/_internal/_series", "partition": "03", "segment": "0000", "error": "invalid series segment"}
2025-08-03T13:56:04.004977Z	error	Panic parsing key	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/_internal/_series", "partition": "04", "segment": "0000", "key": "db01000874736d315f77616c0800086461746162617365000867726170686974650006656e67696e650004747370650005696e6d656d000470617468002a2f7661722f64622f696e666c757864622f646174612f67726170686974652f6175746f67656e2f323532000f726574656e74696f6e506f6c69637900076175746f67656e000777616c5061746800292f7661722f64622f696e666c757864622f77616c2f67726170686974652f6175746f67656e2f32353201000000000000056be101000e74736d315f66696c6573746f7265080008646174616261736500", "offset": 4042, "recovered": "runtime error: slice bounds out of range [256:37]"}
2025-08-03T13:56:04.006609Z	error	Unable to advance buffer	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/graphite/_series", "partition": "04", "segment": "0000", "offset": 285, "error": "unable to advance 60 bytes: 19 remaining"}
2025-08-03T13:56:04.007005Z	error	Index inconsistency	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/graphite/_series", "partition": "06", "id": 41, "got_deleted": true, "expected_deleted": false}
2025-08-03T13:56:04.008229Z	error	Error opening segment	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/telegraf/_series", "partition": "00", "segment": "0000", "error": "invalid series segment"}
2025-08-03T13:56:04.009270Z	error	Index inconsistency	{"log_id": "0y83Ku2l000", "path": "/var/lib/influxdb/data/telegraf/_series", "partition": "06", "id": 47, "got_deleted": true, "expected_deleted": false}

When I do a

root@debian:~# influx_inspect verify -dir /var/lib/influxdb/data
/var/lib/influxdb/data/_internal/monitor/1/000000001-000000001.tsm: healthy
....
/var/lib/influxdb/data/telegraf/autogen/1749/000000002-000000002.tsm: healthy
/var/lib/influxdb/data/telegraf/autogen/1758/000000001-000000001.tsm: healthy
Broken Blocks: 0 / 2490073, in 10.052598455s

it looks ok.

Don’t know how this could happen. How can I fix this? Is there any repair possibility?

There was a failure with the index files so I deleted them and it worked. I used the following commands:

1.Stop the database( if not already so)

2.rm -fR /var/lib/influxdb/data/_internal/_series
  rm -fR /var/lib/influxdb/data/your_database_folders/_series

3.Start the database

After that it took a time to start influxdb because the series will be recreated during startup.