MySQL slave with LVM: Difference between revisions
m (Text replacement - "<source " to "<syntaxhighlight ") |
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===Get the data mount=== | ===Get the data mount=== | ||
< | <syntaxhighlight lang=bash> | ||
master# 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 | ||
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Enough space for a snapshot? | Enough space for a snapshot? | ||
< | <syntaxhighlight lang=bash> | ||
master# lvs /dev/mapper/vg--mysql-mysql--data | master# lvs /dev/mapper/vg--mysql-mysql--data | ||
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert | LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert | ||
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===Create a concsistent snapshot=== | ===Create a concsistent snapshot=== | ||
< | <syntaxhighlight lang=bash> | ||
master# mysql -e "FLUSH TABLES WITH READ LOCK; SHOW MASTER STATUS;" > ${DATADIR}/master_status.$(date "+%Y%m%d_%H%M%S") | 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 | ||
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==Copy the data to the slave== | ==Copy the data to the slave== | ||
< | <syntaxhighlight lang=bash> | ||
slave# DATADIR="$(mysql --batch --skip-column-names -e "show variables like 'datadir'" | awk '{print $NF;}')" | slave# DATADIR="$(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 - ) | slave# ssh -c blowfish master "cd /mnt ; tar cSpzf - ." | ( cd ${DATADIR} ; tar xlvSpzf - ) | ||
</source> | </source> | ||
==Create replication user on master== | ==Create replication user on master== | ||
< | <syntaxhighlight lang=bash> | ||
master# mysql -e "" | master# mysql -e "" | ||
</source> | </source> | ||
==Setup slave== | ==Setup slave== | ||
< | <syntaxhighlight lang=bash> | ||
slave# mysql -e "" | slave# mysql -e "" | ||
</source> | </source> | ||
Revision as of 23:41, 25 November 2021
UNFINISHED first few lines...
Create LVM snapshot
Get the data mount
<syntaxhighlight lang=bash> 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;}')" </source>
Enough space for a snapshot? <syntaxhighlight lang=bash> master# lvs /dev/mapper/vg--mysql-mysql--data
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert mysql-data vg-mysql -wi-ao--- 140,00g
master# vgs vg-mysql
VG #PV #LV #SN Attr VSize VFree vg-mysql 2 3 1 wz--n- 199,99g 20,00g
</source>
Create a concsistent snapshot
<syntaxhighlight lang=bash> 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 </source>
Set the innodb_data_file_path to the same value on the slave.
Copy the data to the slave
<syntaxhighlight lang=bash> 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>
Create replication user on master
<syntaxhighlight lang=bash> master# mysql -e "" </source>
Setup slave
<syntaxhighlight lang=bash> slave# mysql -e "" </source>
