MySQL slave with LVM: Difference between revisions
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Filesystem Size Used Avail Use% Mounted on | Filesystem Size Used Avail Use% Mounted on | ||
/dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql | /dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql | ||
master# DATADIR="$(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')" | |||
</source> | </source> | ||
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===Create a concsistent snapshot=== | ===Create a concsistent snapshot=== | ||
<source lang=bash> | <source lang=bash> | ||
master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > | master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > ${DATADIR}/master_status.$(date "+%Y%m%d_%H%M%S") | ||
master# lvcreate -l50%FREE -s -n mysql-data-snap /dev/vg-mysql/mysql-data | master# lvcreate -l50%FREE -s -n mysql-data-snap /dev/vg-mysql/mysql-data | ||
master# mysql -e "UNLOCK TABLES;" | master# mysql -e "UNLOCK TABLES;" | ||
| Line 36: | Line 37: | ||
==Copy the data to the slave== | ==Copy the data to the slave== | ||
<source lang=bash> | <source lang=bash> | ||
slave# ssh -c blowfish master "cd /mnt ; tar cSpzf - ." | ( cd | slave# DATADIR="$(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')" | ||
slave# ssh -c blowfish master "cd /mnt ; tar cSpzf - ." | ( cd ${DATADIR} ; tar xlvSpzf - ) | |||
</source> | </source> | ||
==Create replication user on master== | |||
<source lang=bash> | <source lang=bash> | ||
master# mysql -e "" | |||
</source> | </source> | ||
==Setup slave== | |||
<source lang=bash> | <source lang=bash> | ||
slave# mysql -e "" | |||
</source> | </source> | ||
Revision as of 15:38, 5 October 2015
UNFINISHED first few lines...
Create LVM snapshot
Get the data mount
master# df -h $(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql
master# DATADIR="$(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')"
Enough space for a snapshot?
master# vgs vg-mysql
VG #PV #LV #SN Attr VSize VFree
vg-mysql 2 3 1 wz--n- 199,99g 20,00g
Create a concsistent snapshot
master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > ${DATADIR}/master_status.$(date "+%Y%m%d_%H%M%S")
master# lvcreate -l50%FREE -s -n mysql-data-snap /dev/vg-mysql/mysql-data
master# mysql -e "UNLOCK TABLES;"
master# mount /dev/vg-mysql/mysql-data-snap /mnt
master# cat /mnt/master_status.20151002_225659
File Position Binlog_Do_DB Binlog_Ignore_DB
mysql-bin.002366 263911913
master# mysql --batch --skip-column-names -e "show variables like 'innodb_data_file_path'"
innodb_data_file_path ibdata1:5G;ibdata2:5G;ibdata3:5G;ibdata4:50M:autoextend
Set the innodb_data_file_path to the same value on the slave.
Copy the data to the slave
slave# DATADIR="$(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')"
slave# ssh -c blowfish master "cd /mnt ; tar cSpzf - ." | ( cd ${DATADIR} ; tar xlvSpzf - )
Create replication user on master
master# mysql -e ""
Setup slave
slave# mysql -e ""
