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backup-mysql.sh
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backup-mysql.sh
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#!/bin/bash
export LC_ALL=C
days_of_backups=3 # Must be less than 7
backup_owner="backup"
parent_dir="/backups/mysql"
defaults_file="/etc/mysql/backup.cnf"
todays_dir="${parent_dir}/$(date +%a)"
log_file="${todays_dir}/backup-progress.log"
encryption_key_file="${parent_dir}/encryption_key"
now="$(date +%m-%d-%Y_%H-%M-%S)"
processors="$(nproc --all)"
# Use this to echo to standard error
error () {
printf "%s: %s\n" "$(basename "${BASH_SOURCE}")" "${1}" >&2
exit 1
}
trap 'error "An unexpected error occurred."' ERR
sanity_check () {
# Check user running the script
if [ "$(id --user --name)" != "$backup_owner" ]; then
error "Script can only be run as the \"$backup_owner\" user"
fi
# Check whether the encryption key file is available
if [ ! -r "${encryption_key_file}" ]; then
error "Cannot read encryption key at ${encryption_key_file}"
fi
}
set_options () {
# List the xtrabackup arguments
xtrabackup_args=(
"--defaults-file=${defaults_file}"
"--backup"
"--extra-lsndir=${todays_dir}"
"--compress"
"--stream=xbstream"
"--encrypt=AES256"
"--encrypt-key-file=${encryption_key_file}"
"--parallel=${processors}"
"--compress-threads=${processors}"
"--encrypt-threads=${processors}"
"--slave-info"
)
backup_type="full"
# Add option to read LSN (log sequence number) if a full backup has been
# taken today.
if grep -q -s "to_lsn" "${todays_dir}/xtrabackup_checkpoints"; then
backup_type="incremental"
lsn=$(awk '/to_lsn/ {print $3;}' "${todays_dir}/xtrabackup_checkpoints")
xtrabackup_args+=( "--incremental-lsn=${lsn}" )
fi
}
rotate_old () {
# Remove the oldest backup in rotation
day_dir_to_remove="${parent_dir}/$(date --date="${days_of_backups} days ago" +%a)"
if [ -d "${day_dir_to_remove}" ]; then
rm -rf "${day_dir_to_remove}"
fi
}
take_backup () {
# Make sure today's backup directory is available and take the actual backup
mkdir -p "${todays_dir}"
find "${todays_dir}" -type f -name "*.incomplete" -delete
xtrabackup "${xtrabackup_args[@]}" --target-dir="${todays_dir}" > "${todays_dir}/${backup_type}-${now}.xbstream.incomplete" 2> "${log_file}"
mv "${todays_dir}/${backup_type}-${now}.xbstream.incomplete" "${todays_dir}/${backup_type}-${now}.xbstream"
}
sanity_check && set_options && rotate_old && take_backup
# Check success and print message
if tail -1 "${log_file}" | grep -q "completed OK"; then
printf "Backup successful!\n"
printf "Backup created at %s/%s-%s.xbstream\n" "${todays_dir}" "${backup_type}" "${now}"
else
error "Backup failure! Check ${log_file} for more information"
fi