Difference between revisions of "MariaDB"

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<!--
 
== Infrastruktur ==  
 
== Infrastruktur ==  
  
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** Ingen failover link - ingen Spanning Tree
 
** Ingen failover link - ingen Spanning Tree
 
** Risiko for split-brain scenarios ?
 
** Risiko for split-brain scenarios ?
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-->
  
 
== PHP/MySQL med failover==
 
== PHP/MySQL med failover==
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== Monitorering ==
 
== Monitorering ==
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 +
Galera SYNC
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* https://github.com/fridim/nagios-plugin-check_galera_cluster
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* Læs også [http://galeracluster.com/documentation-webpages/galerastatusvariables.html#wsrep-connected Galera Status Variables]
  
 
Følgende targets skal sættes i nagios for alle 3 nodes
 
Følgende targets skal sættes i nagios for alle 3 nodes
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* LOAD DATA INFILE - forventer lokale filer
 
* 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
 
** 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)
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** genereringen af SSCC stregkoder samt sms koder forudsætter direkte sekvens - disse skal kodes om.
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** [https://mariadb.org/auto-increments-in-galera/ læs mere...]
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* [http://galeracluster.com/documentation-webpages/limitations.html Galera Limitations] Alle skal Læse denne (vær især obs på "Transaction Size" sektionen)
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<!--
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== Stop Windows Scheduler ==
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# Hent [https://technet.microsoft.com/en-us/sysinternals/pxexec.aspx SysInternals psexec]
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# start en cmd som SYSTEM brugeren: psexec -i -s cmd
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# fra den nye CMD stop scheduler service med: sc stop schedule
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# når migrering er på plads, så start scheduler med: sc start schedule
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-->
  
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Alle skal Læse (vær obs på "Transaction Size" sektionen)
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[https://social.technet.microsoft.com/Forums/windowsserver/en-US/b9e5a4c0-073c-42fd-a390-8b2aee407a4f/task-scheduler-service-schedule-cannot-be-stopped-in-windows-2008-r1-?forum=winserversecurity Kilde]
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* http://galeracluster.com/documentation-webpages/limitations.html
 
  
 
== Galera ==  
 
== Galera ==  
 
* https://mariadb.org/installing-mariadb-galera-cluster-on-debian-ubuntu/
 
* https://mariadb.org/installing-mariadb-galera-cluster-on-debian-ubuntu/
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* https://mariadb.com/kb/en/mariadb/getting-started-with-mariadb-galera-cluster/
  
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+
husk at sætte
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== Ting der skal undersøges ==
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wsrep_node_name="node-name"
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wsrep_on=ON
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* Mysql slave og galera master på samme tid ?
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den sidste er yderst vigtigt for at galera vil starte
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== ToDo ==
 
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* Gør Maria DB 2 og 3 klar.
 
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** <strike>Installer mariadb 10.1</strike>
 
  
 
==Links==
 
==Links==
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</pre>
 
</pre>
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==Centos/RHEL==
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https://github.com/Tunts/bakery/wiki/Setting-up-MariaDB-10.1---Galera-Cluster-on-Centos-7
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https://www.percona.com/doc/percona-xtrabackup/LATEST/installation/yum_repo.html
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"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"
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 +
remember
 +
 +
* (define your cluster as a set of hostnames and NOT as a list of IP's) ?
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* If using xtrabackup transfer
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** socat in centos 7/rehl 7 doesn't work with SST - so install anothter one
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** to set <code>wsrep_sst_method=xtrabackup-v2</code>
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** and set wsrep_sst_auth="user:secret" [https://www.percona.com/doc/percona-xtradb-cluster/LATEST/howtos/centos_howto.html]
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** and create the user
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*** mysql@percona1> CREATE USER 'sstuser'@'localhost' IDENTIFIED BY 's3cret';
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*** mysql@percona1> GRANT PROCESS, RELOAD, LOCK TABLES, REPLICATION CLIENT ON *.* TO 'sstuser'@'localhost';
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*** mysql@percona1> FLUSH PRIVILEGES;
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* disable selinux !!!!
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* disable host firewall totally
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**  systemctl stop firewalld
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**  systemctl disable firewalld

Latest revision as of 16:43, 25 February 2018


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
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