@Valerio found this out first, but never received an answer. Today I found it out, too. But this is present since 2019 (or even longer).
I would say it's a bug, as:
- it prevents HDD/SSD spindown/sleep (depending on the location of docker.img)
- it wears out the SSD in the long run (if docker.img is located here) - see this bug, too.
- it prevents reaching CPU's deep sleep states
What happens:
- /var/lib/docker/containers/*/hostconfig.json is updated every 5 seconds with the same content
- /var/lib/docker/containers/*/config.v2.json is updated every 5 seconds with the same content except of some timestamps (which shouldn't be part of a config file I think)
Which docker containers:
- verified are Plex (Original) and PiHole, but maybe this is a general behaviour
As an example the source of hostconfig.json which was updated yesterday 17280x times with the same content:
find /var/lib/docker/containers/40b4197fdea122178139e9571ae5f4040a2ef69449acf14e616010c7e293bb44 -ls -name hostconfig.json -exec cat {} \; 2678289 4 -rw-r--r-- 1 root root 1725 Oct 8 13:46 /var/lib/docker/containers/40b4197fdea122178139e9571ae5f4040a2ef69449acf14e616010c7e293bb44/hostconfig.json { "Binds":[ "/mnt/user/tv:/tv:ro", "/mnt/cache/appdata/Plex-Media-Server:/config:rw", "/mnt/cache/appdata/Plex-Transcode:/transcode:rw", "/mnt/user/movie:/movie:ro" ], "ContainerIDFile":"", "LogConfig":{ "Type":"json-file", "Config":{ "max-file":"1", "max-size":"50m" } }, "NetworkMode":"host", "PortBindings":{ }, "RestartPolicy":{ "Name":"no", "MaximumRetryCount":0 }, "AutoRemove":false, "VolumeDriver":"", "VolumesFrom":null, "CapAdd":null, "CapDrop":null, "Capabilities":null, "Dns":[ ], "DnsOptions":[ ], "DnsSearch":[ ], "ExtraHosts":null, "GroupAdd":null, "IpcMode":"private", "Cgroup":"", "Links":null, "OomScoreAdj":0, "PidMode":"", "Privileged":false, "PublishAllPorts":false, "ReadonlyRootfs":false, "SecurityOpt":null, "UTSMode":"", "UsernsMode":"", "ShmSize":67108864, "Runtime":"runc", "ConsoleSize":[ 0, 0 ], "Isolation":"", "CpuShares":0, "Memory":0, "NanoCpus":0, "CgroupParent":"", "BlkioWeight":0, "BlkioWeightDevice":[ ], "BlkioDeviceReadBps":null, "BlkioDeviceWriteBps":null, "BlkioDeviceReadIOps":null, "BlkioDeviceWriteIOps":null, "CpuPeriod":0, "CpuQuota":0, "CpuRealtimePeriod":0, "CpuRealtimeRuntime":0, "CpusetCpus":"", "CpusetMems":"", "Devices":[ { "PathOnHost":"/dev/dri", "PathInContainer":"/dev/dri", "CgroupPermissions":"rwm" } ], "DeviceCgroupRules":null, "DeviceRequests":null, "KernelMemory":0, "KernelMemoryTCP":0, "MemoryReservation":0, "MemorySwap":0, "MemorySwappiness":null, "OomKillDisable":false, "PidsLimit":null, "Ulimits":null, "CpuCount":0, "CpuPercent":0, "IOMaximumIOps":0, "IOMaximumBandwidth":0, "MaskedPaths":[ "/proc/asound", "/proc/acpi", "/proc/kcore", "/proc/keys", "/proc/latency_stats", "/proc/timer_list", "/proc/timer_stats", "/proc/sched_debug", "/proc/scsi", "/sys/firmware" ], "ReadonlyPaths":[ "/proc/bus", "/proc/fs", "/proc/irq", "/proc/sys", "/proc/sysrq-trigger" ] }
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