Dear all,
While trying to migrate or DNS to Knot I have noticed that a slave
server with 2GB RAM is facing memory exhaustion. I am running
2.6.5-1+0~20180216080324.14+stretch~1.gbp257446. There is 141 zones
having around 1MB in total. Knot is acting as pure slave server with
minimal configuration.
There is nearly 1.7GB of memory consumed by Knot on a freshly rebooted
server:
root@eira:/proc/397# cat status
Name: knotd
Umask: 0007
State: S (sleeping)
Tgid: 397
Ngid: 0
Pid: 397
PPid: 1
TracerPid: 0
Uid: 108 108 108 108
Gid: 112 112 112 112
FDSize: 64
Groups: 112
NStgid: 397
NSpid: 397
NSpgid: 397
NSsid: 397
VmPeak: 24817520 kB
VmSize: 24687160 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 1743400 kB
VmRSS: 1743272 kB
RssAnon: 1737088 kB
RssFile: 6184 kB
RssShmem: 0 kB
VmData: 1781668 kB
VmStk: 132 kB
VmExe: 516 kB
VmLib: 11488 kB
VmPTE: 3708 kB
VmPMD: 32 kB
VmSwap: 0 kB
HugetlbPages: 0 kB
Threads: 21
SigQ: 0/7929
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: fffffffe7bfbbefc
SigIgn: 0000000000000000
SigCgt: 0000000180007003
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
Seccomp: 0
Cpus_allowed: f
Cpus_allowed_list: 0-3
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 260
nonvoluntary_ctxt_switches: 316
root@eira:/proc/397#
Config:
server:
listen: 0.0.0.0@53
listen: ::@53
user: knot:knot
log:
- target: syslog
any: info
mod-rrl:
- id: rrl-10
rate-limit: 10 # Allow 200 resp/s for each flow
slip: 2 # Every other response slips
mod-stats:
- id: custom
edns-presence: on
query-type: on
request-protocol: on
server-operation: on
request-bytes: on
response-bytes: on
edns-presence: on
flag-presence: on
response-code: on
reply-nodata: on
query-type: on
query-size: on
reply-size: on
template:
- id: default
storage: "/var/lib/knot"
module: mod-rrl/rrl-10
module: mod-stats/custom
acl: [allowed_transfer]
disable-any: on
master: idunn
I was pretty sure that a VM with 2GB RAM is enough for my setup :-)
BR
Ales
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