mysqldump: Got errno 32 on write

Question

I used this script for years on my VPS. And it\'s still working.

DBLIST=`mysql -uroot -pROOT_PASSWORD -ANe\"SELECT GROUP_CONCAT(schema_name) FROM information         


        

Answer 1

I was using mysqldump from the CLI and trying to pipe to gzip and/or a file and getting a "permission denied" error.

Even as sudo, I was getting an error because although I was running mysqldump as sudo, the pipe was still trying to use the user account I was logged in to the shell as to write the output. In this case, my shell user account did not have permissions to write to the target directory.

To get around this, you can use the tee command in conjunction with sudo:

mysqldump --single-transaction --routines --events --triggers --add-drop-table --extended-insert -u backup -h 127.0.0.1 -p --all-databases | gzip -9 | sudo tee /var/backups/sql/all_$(date +"%Y_week_%U").sql.gz > /dev/null

The | sudo tee /var/backups/... is what lets us pipe to a directory that is only writable by root. The > /dev/null suppresses tee from dumping its output directly to the screen.