Mysql Crash Recovery
Mysql Crash Recovery
BUG "http://bugzilla.zimbra.com/show_bug.cgi?id=15797"
Mysql Crash recovery is performed when Mysql stops responding and there is error in the /opt/zimbra/db/data/hostname.err [Please check the BUG above for more information]
Steps to perform Recovery:
- Edit /opt/zimbra/conf/my.cnf: Put an entry innodb_force_recovery = 3 in the [mysqld] section
- Dump the database: mysqldump zimbra and mboxgroup DB's
- Drop all Database's.
- Create all Database's.
- Restore dump data.
1) Edit the /opt/zimbra/conf/my.cnf file and put innodb_force_recovery = 3 under the [mysqld] section
- Save the file and start mysql with mysql.server start
2)
mysql -NB -e "show databases" | grep mbox > /tmp/mysql.db.list
[Make a list of the existing databases] 3)
mkdir /tmp/mysql.sql
4)
mysqldump zimbra -S /opt/zimbra/db/mysql.sock -u root --password=''password_for_mysql_root'' > /tmp/mysql.sql/zimbra.sql
[Mysql Root Password you can get this by zmlocalconfig -s -m nokey zimbra_mysql_password]
5) Dumping Databases: Run the following command from the prompt:
for db in `< /tmp/mysql.db.list`; do /opt/zimbra/mysql/bin/mysqldump $db -S /opt/zimbra/db/mysql.sock -u root --password=password_for_mysql_root > /tmp/mysql.sql/$db.sql echo -e "Dumped $db\n" done
[Mysql Zimbra Password You can get the password: zmlocalconfig -s -m nokey zimbra_mysql_password]
6) Drop the Database:
for db in `< /tmp/mysql.db.list` do mysql -u root --password=''password_for_mysql_root'' -e "drop database $db" echo -e "Dropped $db" done
7)
mysql -e "drop database zimbra"
8) Run Mysql in Non-Recovery Mode:
Remove the innodb_force_recovery = 3 from the /opt/zimbra/conf/my.cnf file.
9)Stop Mysql Server and Start again.
10)Create Database:
mysql -e "create database zimbra character set utf8"
11) Create the existed Database:
for db in `< /tmp/mysql.db.list` do mysql -e "create database $db character set utf8" echo -e "Created $db \n" done
12)
mysql zimbra < /tmp/mysql.sql/zimbra.sql
13) Update Mboxgroup:
for sql in /tmp/mysql.sql/mbox* do mysql `basename $sql .sql` < $sql echo -e "Updated `basename $sql .sql` \n" done
14)
zmcontrol start
15) Verify mail delivery and account creation & deletion. Check /opt/zimbra/log/mailbox.log for database errors.