MariaDB

From HoerupWIki
Jump to: navigation, search


PHP/MySQL med failover

Monitorering

Galera SYNC

Følgende targets skal sættes i nagios for alle 3 nodes

  • Galera cync
  • Intel SSD
  • SW Raid
  • MySQL connection
  • CPU forbrug
  • free space:
    • root partition
    • /mnt/data

Ting at være obs på

  • LOAD DATA INFILE - forventer lokale filer
    • LOAD DATA LOCAL INFILE er implicit IGNORE, så der kommer ingen fejl hvis at der er fejl i datafilen
  • auto_increment tabeller laver ikke længere nummerserien som direkte fortløbende (1,2,3) men springer derimod i numrene (3,7,10)
    • genereringen af SSCC stregkoder samt sms koder forudsætter direkte sekvens - disse skal kodes om.
    • læs mere...
  • Galera Limitations Alle skal Læse denne (vær især obs på "Transaction Size" sektionen)


Kilde

Galera

husk at sætte

wsrep_node_name="node-name"
wsrep_on=ON

den sidste er yderst vigtigt for at galera vil starte

Links

Checksum

Note: Nuværende slave data er bygget op fra mysqldump - som skipper dato stemplede tabeller, så når de er fraværende vil pt-table-checksum brokke sig

Gennemført på

  • test
  • master
  • logs
06-12T21:36:31 Skipping table logs.morgen_rapport because on the master it would be checksummed in one chunk but on these replicas it has too many rows:
  139820 rows on info-backup
  142723 rows on MariaDB-01
The current chunk size limit is 137222 rows (chunk size=68611 * chunk size limit=2.0).

  • fulddaeking
  • produktion_status
06-12T22:08:55 Skipping table produktion_status.30-5lossalgnyture_tan_frem30052013 because it has problems on these replicas:
Table produktion_status.30-5lossalgnyture_tan_frem30052013 does not exist on replica info-backup
Table produktion_status.30-5lossalgnyture_tan_frem30052013 does not exist on replica MariaDB-01
06-12T22:13:19      0      0 10741793     144       0 260.846 produktion_status.aflo
06-12T22:13:25 Skipping chunk 1 of produktion_status.afregning because MySQL used only 7 bytes of the PRIMARY index instead of 134.  See the --[no]check-plan documentation for more information.

Centos/RHEL

https://github.com/Tunts/bakery/wiki/Setting-up-MariaDB-10.1---Galera-Cluster-on-Centos-7

https://www.percona.com/doc/percona-xtrabackup/LATEST/installation/yum_repo.html

"Due to a bug in socat on CentOS 7, the xtrabackup-v2 method does not work. This can be solved by installing an older version of socat or by using the rsync method for wsrep_sst_method"

remember

  • (define your cluster as a set of hostnames and NOT as a list of IP's) ?
  • If using xtrabackup transfer
    • socat in centos 7/rehl 7 doesn't work with SST - so install anothter one
    • to set wsrep_sst_method=xtrabackup-v2
    • and set wsrep_sst_auth="user:secret" [1]
    • and create the user
      • mysql@percona1> CREATE USER 'sstuser'@'localhost' IDENTIFIED BY 's3cret';
      • mysql@percona1> GRANT PROCESS, RELOAD, LOCK TABLES, REPLICATION CLIENT ON *.* TO 'sstuser'@'localhost';
      • mysql@percona1> FLUSH PRIVILEGES;
  • disable selinux !!!!
  • disable host firewall totally
    • systemctl stop firewalld
    • systemctl disable firewalld