Netdata data data persistence configuration

By default ,netdata The storage time of historical data is short , Only circular storage 2 To 3 Days of historical data , So we need to change it netdata Configure to store data for longer periods of time .
Default netdata.conf The configuration file has no data , need curl wget Command to import templates

curl -o /etc/netdata/netdata.conf http://localhost:19999/netdata.conf

Modify the following
Earlier versions were in global In the label

vi /etc/netdata/netdata.conf

Edit the configuration file as follows
Legacy configuration global label

[global]
    memory mode = dbengine
    page cache size = 32
    dbengine disk space = 3200

The new version is configured in db In the label

[db]
    memory mode = dbengine
    page cache size = 32
    dbengine disk space =3200

This configuration configures 32M cache ,3.2G disk space , Can support Per second 2000 Data points ,30 God .
memory mode The default configuration is 32M cache ,256M disk space , The required disk space can be calculated according to the actual storage

dbengine The storage path of is

/var/cache/netdata/dbengine

View the database size

cd /var/cache/netdata/
du -sh dbengine

momory mode Meaning of options
1.dbengine,（ Default ） The data is in the database file . The default configuration 32M cache ,256M disk space
2.ram, Data is in memory . The data will never be saved on the hard disk . This mode uses mmap() And support KSM.
3.save,  netdata Run time memory , Drop disk and read disk during restart . It also uses mmap() And support KSM.
4.map, The data is in a memory mapped file . This will keep writing to your disk . This mode uses mmap() But does not support KSM.
5.none, No database （ Collected metrics can only be streamed to another Netdata）.
6.alloc, Follow ram The pattern is the same, but it uses calloc() And does not support KSM. This mode can be removed from none Other modes of mode fallback .