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howto:fix_self_corrupt_mysql [2016/07/29 19:34] bram this was breaking mysql because he couldn't read those file due to permission problems |
howto:fix_self_corrupt_mysql [2019/05/20 01:06] (current) tierce old revision restored (2018/12/08 22:28) |
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| In some situations (typically power failure), MySQL corrupts its own database (called "mysql") and won't start again. This breaks any application using MySQL. | In some situations (typically power failure), MySQL corrupts its own database (called "mysql") and won't start again. This breaks any application using MySQL. | ||
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| + | **You can try this script by Bram that should normally auto-fix this issue but need more testing (and we are looking for testing) https://github.com/labriqueinternet/auto-fix-mysql Plz contact us if you intent to do so** | ||
| Here is a way to restore MySQL in this situation. I've never managed to prevent that, but [[howto:daily_backup|backing up this DB]] would likely allow simpler restorations. | Here is a way to restore MySQL in this situation. I've never managed to prevent that, but [[howto:daily_backup|backing up this DB]] would likely allow simpler restorations. | ||
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| # BUT I HAVEN'T TESTED IT | # BUT I HAVEN'T TESTED IT | ||
| for i in app1 app2 app3; do mysql -p$(cat /etc/yunohost/mysql) mysql -e "insert into user values('localhost','$i', PASSWORD('$(yunohost app setting $i mysqlpwd)'),'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','','','','',0,0,0,0,'','','N','N'); GRANT ALL PRIVILEGES ON $i.* TO '$i'@localhost;"; done; mysql -p$(cat /etc/yunohost/mysql) mysql -e "FLUSH PRIVILEGES;" | for i in app1 app2 app3; do mysql -p$(cat /etc/yunohost/mysql) mysql -e "insert into user values('localhost','$i', PASSWORD('$(yunohost app setting $i mysqlpwd)'),'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','','','','',0,0,0,0,'','','N','N'); GRANT ALL PRIVILEGES ON $i.* TO '$i'@localhost;"; done; mysql -p$(cat /etc/yunohost/mysql) mysql -e "FLUSH PRIVILEGES;" | ||
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| + | --- | ||
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| + | On another weird situation, the DB permissions disappeared and we were unable to re-grant permissions to the app because root was not allowed to give permissions... And it seemed not possible to grant it permissions for *.* for some really weird reasons. ljf was able to hand-craft a request to manually give the permissions to root on all tables, allowing to grant permissions to specific users. | ||
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| + | I think we started with a mysqld_safe --skip-grant-tables in one terminal, and then in another : | ||
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| + | for i in app1 app2 app3; do mysql -p$(cat /etc/yunohost/mysql) mysql -e "delete from user WHERE User='$i'; insert into user values('localhost','$i', PASSWORD('$(yunohost app setting $i mysqlpwd)'),'N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','N','','','','',0,0,0,0,'','','N','N'); INSERT INTO db VALUES('localhost','$i','root','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y'); FLUSH PRIVILEGES; GRANT ALL PRIVILEGES ON $i.* TO '$i'@localhost;"; done; mysql -p$(cat /etc/yunohost/mysql) mysql -e "FLUSH PRIVILEGES;" | ||
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