Error on Debian 10: Cannot get the proper memory information to size server.

[saschaszott]

Description

Running fn start (as root) on Debian 10 Buster is failing with error message

time="2021-02-20T11:17:49Z" level=fatal msg="Cannot get the proper memory information to size server." error="open /proc/meminfo: permission denied"

Steps to reproduce the issue:

1. run fn start (as root)

Describe the results you received:

# fn start
2021/02/20 12:16:54 ¡¡¡ 'fn start' should NOT be used for PRODUCTION !!! see https://github.com/fnproject/fn-helm/
time="2021-02-20T11:17:49Z" level=info msg="Setting log level to" fields.level=info
time="2021-02-20T11:17:49Z" level=info msg="Registering data store provider 'sql'"
time="2021-02-20T11:17:49Z" level=info msg="Connecting to DB" url="sqlite3:///app/data/fn.db"
time="2021-02-20T11:17:49Z" level=info msg="datastore dialed" datastore=sqlite3 max_idle_connections=256 url="sqlite3:///app/data/fn.db"
time="2021-02-20T11:17:49Z" level=info msg="agent starting cfg={MinDockerVersion:17.10.0-ce ContainerLabelTag: DockerNetworks: DockerLoadFile: DisableUnprivilegedContainers:false FreezeIdle:50ms HotPoll:200ms HotLauncherTimeout:1h0m0s HotPullTimeout:10m0s HotStartTimeout:5s DetachedHeadRoom:6m0s MaxResponseSize:0 MaxHdrResponseSize:0 MaxLogSize:1048576 MaxTotalCPU:0 MaxTotalMemory:0 MaxFsSize:0 MaxPIDs:50 MaxOpenFiles:0xc420331a78 MaxLockedMemory:0xc420331a90 MaxPendingSignals:0xc420331a98 MaxMessageQueue:0xc420331aa0 PreForkPoolSize:0 PreForkImage:busybox PreForkCmd:tail -f /dev/null PreForkUseOnce:0 PreForkNetworks: EnableNBResourceTracker:false MaxTmpFsInodes:0 DisableReadOnlyRootFs:false DisableDebugUserLogs:false IOFSEnableTmpfs:false EnableFDKDebugInfo:false IOFSAgentPath:/iofs IOFSMountRoot:/root/.fn/iofs IOFSOpts: ImageCleanMaxSize:0 ImageCleanExemptTags: ImageEnableVolume:false}"
time="2021-02-20T11:17:49Z" level=info msg="no docker auths from config files found (this is fine)" error="open /root/.dockercfg: no such file or directory"
time="2021-02-20T11:17:49Z" level=fatal msg="Cannot get the proper memory information to size server." error="open /proc/meminfo: permission denied"
2021/02/20 12:17:59 Error: processed finished with error exit status 1

Describe the results you expected:

The error should not occur.

Additional information you deem important (e.g. issue happens only occasionally):

Output of fn version (CLI command):

# fn version
Client version is latest version: 0.6.1
Server version:  ?

Additional environment details (OSX, Linux, flags, etc.):

Output of lsb_release -a

No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

Output of docker -v

Docker version 20.10.3, build 48d30b5

Output of cat /proc/meminfo

MemTotal:        1000000 kB
MemFree:          438824 kB
MemAvailable:     868780 kB
Buffers:               0 kB
Cached:           429956 kB
SwapCached:            0 kB
Active:           303196 kB
Inactive:         212032 kB
Active(anon):      10888 kB
Inactive(anon):    83204 kB
Active(file):     292308 kB
Inactive(file):   128828 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       1000000 kB
SwapFree:        1000000 kB
Dirty:              1836 kB
Writeback:             0 kB
AnonPages:      10993300 kB
Mapped:          3765632 kB
Shmem:              8184 kB
KReclaimable:    1267632 kB
Slab:               0 kB
SReclaimable:          0 kB
SUnreclaim:            0 kB
KernelStack:       58236 kB
PageTables:       256640 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    25709016 kB
Committed_AS:   52006552 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
Percpu:            60544 kB
HardwareCorrupted:     0 kB
AnonHugePages:   4589568 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:               0 kB
DirectMap4k:     6487356 kB
DirectMap2M:    27039744 kB