#!/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 [ "$USER" != "$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 innobackupex arguments
    #declare -ga innobackupex_args=(
    innobackupex_args=(
        "--defaults-file=${defaults_file}"
        "--extra-lsndir=${todays_dir}"
        "--compress"
        "--stream=xbstream"
        "--encrypt=AES256"
        "--encrypt-key-file=${encryption_key_file}"
        "--parallel=${processors}"
        "--compress-threads=${processors}"
        "--encrypt-threads=${processors}"
        "--slave-info"
        "--incremental"
    )
	
    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")
        innobackupex_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
    innobackupex "${innobackupex_args[@]}" "${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

#!/bin/bash
	
export LC_ALL=C
	
backup_owner="backup"
encryption_key_file="/backups/mysql/encryption_key"
log_file="extract-progress.log"
number_of_args="${#}"
processors="$(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.  Try checking the \"${log_file}\" file for more information."' ERR
	
sanity_check () {
    # Check user running the script
    if [ "${USER}" != "${backup_owner}" ]; then
        error "Script can only be run as the \"${backup_owner}\" user"
    fi
	
    # Check whether the qpress binary is installed
    if ! command -v qpress >/dev/null 2>&1; then
        error "Could not find the \"qpress\" command.  Please install it and try again."
    fi
	
    # Check whether any arguments were passed
    if [ "${number_of_args}" -lt 1 ]; then
        error "Script requires at least one \".xbstream\" file as an argument."
    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
}
	
do_extraction () {
    for file in "${@}"; do
        base_filename="$(basename "${file%.xbstream}")"
        restore_dir="./restore/${base_filename}"
	
        printf "\n\nExtracting file %s\n\n" "${file}"
	
        # Extract the directory structure from the backup file
        mkdir --verbose -p "${restore_dir}"
        xbstream -x -C "${restore_dir}" < "${file}"
	
        innobackupex_args=(
            "--parallel=${processors}"
            "--decrypt=AES256"
            "--encrypt-key-file=${encryption_key_file}"
            "--decompress"
        )
	
        innobackupex "${innobackupex_args[@]}" "${restore_dir}"
        find "${restore_dir}" -name "*.xbcrypt" -exec rm {} \;
        find "${restore_dir}" -name "*.qp" -exec rm {} \;
	
        printf "\n\nFinished work on %s\n\n" "${file}"
	
    done > "${log_file}" 2>&1
}
	
sanity_check && do_extraction "$@"
	
ok_count="$(grep -c 'completed OK' "${log_file}")"
	
# Check the number of reported completions.  For each file, there is an
# informational "completed OK".  If the processing was successful, an
# additional "completed OK" is printed. Together, this means there should be 2
# notices per backup file if the process was successful.
if (( $ok_count !=  2 * $# )); then
    error "It looks like something went wrong. Please check the \"${log_file}\" file for additional information"
else
    printf "Extraction complete! Backup directories have been extracted to the \"restore\" directory.\n"
fi

#!/bin/bash
	
export LC_ALL=C
	
shopt -s nullglob
incremental_dirs=( ./incremental-*/ )
full_dirs=( ./full-*/ )
shopt -u nullglob
	
backup_owner="backup"
log_file="prepare-progress.log"
full_backup_dir="${full_dirs[0]}"
	
# 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.  Try checking the \"${log_file}\" file for more information."' ERR
	
sanity_check () {
    # Check user running the script
    if [ "${USER}" != "${backup_owner}" ]; then
        error "Script can only be run as the \"${backup_owner}\" user."
    fi
	
    # Check whether a single full backup directory are available
    if (( ${#full_dirs[@]} != 1 )); then
        error "Exactly one full backup directory is required."
    fi
}
	
do_backup () {
    # Apply the logs to each of the backups
    printf "Initial prep of full backup %s\n" "${full_backup_dir}"
    innobackupex --redo-only --apply-log "${full_backup_dir}"
	
    for increment in "${incremental_dirs[@]}"; do
        printf "Applying incremental backup %s to %s\n" "${increment}" "${full_backup_dir}"
        innobackupex --redo-only --apply-log --incremental-dir="${increment}" "${full_backup_dir}"
    done
	
    printf "Applying final logs to full backup %s\n" "${full_backup_dir}"
    innobackupex --apply-log "${full_backup_dir}"
}
	
sanity_check && do_backup > "${log_file}" 2>&1
	
# Check the number of reported completions.  Each time a backup is processed,
# an informational "completed OK" and a real version is printed.  At the end of
# the process, a final full apply is performed, generating another 2 messages.
ok_count="$(grep -c 'completed OK' "${log_file}")"
	
if (( ${ok_count} == 2 * (${#full_dirs[@]} + ${#incremental_dirs[@]} + 1) )); then
    cat << EOF
Backup looks to be fully prepared.  Please check the "prepare-progress.log" file
to verify before continuing.
	
If everything looks correct, you can apply the restored files.
	
First, stop MySQL and move or remove the contents of the MySQL data directory:
	
        sudo systemctl stop mysql
        sudo mv /var/lib/mysql/ /tmp/
	
Then, recreate the data directory and  copy the backup files:
	
        sudo mkdir /var/lib/mysql
        sudo innobackupex --copy-back ${PWD}/$(basename "${full_backup_dir}")
	
Afterward the files are copied, adjust the permissions and restart the service:
	
        sudo chown -R mysql:mysql /var/lib/mysql
        sudo find /var/lib/mysql -type d -exec chmod 750 {} \\;
        sudo systemctl start mysql
EOF
else
    error "It looks like something went wrong.  Check the \"${log_file}\" file for more information."
fi

#!/bin/bash
sudo -u backup systemd-cat --identifier=backup-mysql /usr/local/bin/backup-mysql.sh