Enhancement #3024
Adjust default dnsmasq cache
Status: | CLOSED | Start date: | ||
---|---|---|---|---|
Priority: | Normal | Due date: | ||
Assignee: | - | % Done: | 100% | |
Category: | nethserver-dnsmasq | |||
Target version: | v6.6 | |||
Resolution: | NEEDINFO: | No |
Description
dnsmasq has a default cache of 150 entries, which is way too low for common usage.
See:
Feb 4 16:33:38 nethsecurity dnsmasq[4394]: cache size 150, 72090/212896 cache insertions re-used unexpired cache entries.
72090 entries were pushed out of unexpired, wasting bandwidth and slowing name resolution.
Associated revisions
dnsmasq.conf: add CacheSize option. Refs #3024
History
#1 Updated by Filippo Carletti over 6 years ago
I'd like to increase cache size to 4096.
I've done some tests, see:
Feb 5 15:52:50 nethsecurity dnsmasq[4538]: cache size 4096, 0/236956 cache insertions re-used unexpired cache entries.
Command to check dnsmasq stats:
killall -USR1 dnsmasq
#2 Updated by Giacomo Sanchietti over 6 years ago
- Category set to nethserver-dnsmasq
I'd like to to have a simple prop inside the database but hidden from the web interface. What do you think?
#3 Updated by Filippo Carletti over 6 years ago
Ok, only a prop in the db, but I'd like to have 4096 (or 2048) as default, not dnsmasq default.
#4 Updated by Giacomo Sanchietti over 6 years ago
- Status changed from NEW to TRIAGED
- Target version changed from v6.6-rc1 to v6.6
- % Done changed from 0 to 20
#5 Updated by Filippo Carletti over 6 years ago
Every host in cache needs roughly 100 bytes, so I think that 4000 is a good default.
Also, the maximum size of the cache is 10000, so the template needs to limit the value.
#6 Updated by Filippo Carletti about 6 years ago
- Status changed from TRIAGED to ON_DEV
- % Done changed from 20 to 30
#7 Updated by Giacomo Sanchietti about 6 years ago
- Assignee set to Giacomo Sanchietti
#8 Updated by Giacomo Sanchietti about 6 years ago
- Status changed from ON_DEV to MODIFIED
- % Done changed from 30 to 60
#9 Updated by Giacomo Sanchietti about 6 years ago
- Status changed from MODIFIED to ON_QA
- Assignee deleted (
Giacomo Sanchietti) - % Done changed from 60 to 70
- nethserver-dnsmasq-1.4.3-1.2.gb3a55f5.ns6.noarch.rpm
- Install the package
- Send SIGUSR1 to dnsmaq:
pkill -SIGUSR1 dnsmasq
- Search in
/var/log/messages
for a line like this:May 14 11:45:10 localhost dnsmasq[24132]: cache size 4000, 0/0 cache insertions re-used unexpired cache entries.
- Change the cache size value
config setprop dnsmasq CacheSize 100 signal-event nethserver-dnsmasq-save
- Send the SIGUSR1 signal and check the cache size is 100
- Change the cache size to a value greater than 10000 (maximum allowed value)
config setprop dnsmasq CacheSize 20000 signal-event nethserver-dnsmasq-save
- Send the SIGUSR1 signal and check the cache size is capped to 10000
#10 Updated by Filippo Carletti about 6 years ago
- Status changed from ON_QA to VERIFIED
- % Done changed from 70 to 90
Note: pkill won't work if you have libvirt installed.
Pre-upgrade:
May 15 19:02:20 ns65 dnsmasq2607: cache size 150, 0/0 cache insertions re-used unexpired cache entries.
Case 1:
May 15 19:04:48 ns65 dnsmasq15937: cache size 4000, 0/0 cache insertions re-used unexpired cache entries.
Case 2:
May 15 19:06:34 ns65 dnsmasq16016: cache size 100, 0/0 cache insertions re-used unexpired cache entries.
Case 3:
[root@ns65 ~]# config show dnsmasq
dnsmasq=service
CacheSize=30000
May 15 19:07:36 ns65 dnsmasq16123: cache size 10000, 0/0 cache insertions re-used unexpired cache entries.
#11 Updated by Giacomo Sanchietti about 6 years ago
- Status changed from VERIFIED to CLOSED
- % Done changed from 90 to 100
- nethserver-dnsmasq-1.4.4-1.ns6.noarch.rpm