MySQL slave with LVM: Difference between revisions
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===Get the data mount=== | ===Get the data mount=== | ||
<source lang=bash> | <source lang=bash> | ||
# df -h $(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}') | master# df -h $(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}') | ||
Filesystem Size Used Avail Use% Mounted on | Filesystem Size Used Avail Use% Mounted on | ||
/dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql | /dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql | ||
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Enough space for a snapshot? | Enough space for a snapshot? | ||
<source lang=bash> | <source lang=bash> | ||
# vgs vg-mysql | master# vgs vg-mysql | ||
VG #PV #LV #SN Attr VSize VFree | VG #PV #LV #SN Attr VSize VFree | ||
vg-mysql 2 3 1 wz--n- 199,99g 20,00g | vg-mysql 2 3 1 wz--n- 199,99g 20,00g | ||
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===Create a concsistent snapshot=== | ===Create a concsistent snapshot=== | ||
<source lang=bash> | <source lang=bash> | ||
master # mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > /var/lib/mysql/master_status.$(date "+%Y%m%d_%H%M%S") | master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > /var/lib/mysql/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;" | ||
master # mount /dev/vg-mysql/mysql-data-snap /mnt | master# mount /dev/vg-mysql/mysql-data-snap /mnt | ||
master # cat /mnt/master_status.20151002_225659 | master# cat /mnt/master_status.20151002_225659 | ||
File Position Binlog_Do_DB Binlog_Ignore_DB | File Position Binlog_Do_DB Binlog_Ignore_DB | ||
mysql-bin.002366 263911913 | mysql-bin.002366 263911913 | ||
master # mysql --batch --skip-column-names -e "show variables like 'innodb_data_file_path'" | 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 | innodb_data_file_path ibdata1:5G;ibdata2:5G;ibdata3:5G;ibdata4:50M:autoextend | ||
</source> | </source> | ||
Revision as of 22:37, 2 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 $NF;}')
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg--mysql-mysql--data 138G 78G 55G 59% /var/lib/mysql
Enough space for a snapshot?
master# vgs vg-mysql
VG #PV #LV #SN Attr VSize VFree
vg-mysql 2 3 1 wz--n- 199,99g 20,00g
Create a concsistent snapshot
master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > /var/lib/mysql/master_status.$(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# ssh -c blowfish master "cd /mnt ; tar cSpzf - ." | ( cd /var/lib/mysql ; tar xlvSpzf - )
