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refactor(mysql): the term master/slave is deprecated
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#!/usr/bin/env bash | ||
# shellcheck disable=SC2029 | ||
# A quick & dirty script to setup a MySQL slave thanks to Percona Xtrabackup | ||
# https://www.percona.com/doc/percona-xtrabackup/2.4/howtos/setting_up_replication.html | ||
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set -o errexit | ||
set -o pipefail | ||
set -o nounset | ||
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MYSQL_DATADIR=${MYSQL_DATADIR:='/var/lib/mysql'} | ||
MYSQL_SOURCE_IP=${MYSQL_SOURCE_IP:='172.16.0.1'} | ||
MYSQL_SOURCE_PASSWORD=${MYSQL_SOURCE_PASSWORD:=''} | ||
MYSQL_SOURCE_USER=${MYSQL_SOURCE_USER:='replication'} | ||
MYSQL_VERSION=${MYSQL_VERSION:='8.0'} | ||
NPROC=$(grep -c processor </proc/cpuinfo || 4) | ||
REPLICA_IP=${REPLICA_IP:='172.16.0.2'} | ||
REPLICA_SSH_USER=${REPLICA_SSH_USER:=$(whoami)} | ||
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readonly BACKUP_DESTINATION="/var/tmp/${REPLICA_SSH_USER}/mysql.$$" | ||
readonly MYSQL_SETUP_SLAVE_SQL="/var/tmp/setup_slave.$$.sql" | ||
readonly NPROC | ||
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if ! command -v qpress &>/dev/null || | ||
! command -v xbstream &>/dev/null || | ||
! command -v xtrabackup &>/dev/null; then | ||
echo >&2 "qpress, xbstream or xtrabackup aren't installed or in PATH" | ||
exit 1 | ||
fi | ||
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if ! ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "mkdir -p ${BACKUP_DESTINATION}"; then | ||
echo >&2 "Can't connect to slave via SSH" | ||
exit 1 | ||
fi | ||
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if ! ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "command -v qpress" || | ||
! ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "command -v xbstream" || | ||
! ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "command -v xtrabackup"; then | ||
echo >&2 "qpress, xbstream or xtrabackup aren't installed or in PATH on the slave" | ||
exit 1 | ||
fi | ||
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ulimit -n 65536 | ||
xtrabackup \ | ||
--backup \ | ||
--compress=zstd \ | ||
--compress-threads="$((NPROC / 2))" \ | ||
--parallel="$((NPROC / 2))" \ | ||
--slave-info \ | ||
--stream=xbstream \ | ||
--target-dir=./ | | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"xbstream -x -C ${BACKUP_DESTINATION}" | ||
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# shellcheck disable=SC2181 | ||
if [[ $? -ne 0 ]]; then | ||
echo >&2 "xtrabackup command failed" | ||
exit 1 | ||
fi | ||
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ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"xtrabackup --remove-original --decompress \ | ||
--parallel=\$(grep -c processor < /proc/cpuinfo || 4) \ | ||
--target-dir=${BACKUP_DESTINATION}" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"xtrabackup --prepare --target-dir=${BACKUP_DESTINATION}" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo service mysql stop" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo chown -R mysql:mysql ${BACKUP_DESTINATION}" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo mkdir -m 0755 -p ${MYSQL_DATADIR}" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo mv ${MYSQL_DATADIR} ${MYSQL_DATADIR}.$$ || true" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo mv ${BACKUP_DESTINATION} ${MYSQL_DATADIR}" | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo service mysql start" | ||
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MYSQL_SOURCE_LOG_FILE=$(ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"sudo cat ${MYSQL_DATADIR}/xtrabackup_binlog_info | awk '{ print \$1; }'") | ||
MYSQL_SOURCE_LOG_POS=$(ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"sudo cat ${MYSQL_DATADIR}/xtrabackup_binlog_info | awk '{ print \$2; }'") | ||
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if [[ "$MYSQL_VERSION" == '8.0' ]]; then | ||
MYSQL_SETUP_SLAVE_QUERY="STOP REPLICA; | ||
CHANGE REPLICATION SOURCE TO | ||
SOURCE_HOST='${MYSQL_SOURCE_IP}', | ||
SOURCE_USER='${MYSQL_SOURCE_USER}', | ||
SOURCE_PASSWORD='${MYSQL_SOURCE_PASSWORD}', | ||
SOURCE_LOG_FILE='${MYSQL_SOURCE_LOG_FILE}', | ||
SOURCE_LOG_POS=${MYSQL_SOURCE_LOG_POS}; | ||
START REPLICA; | ||
" | ||
else | ||
MYSQL_SETUP_SLAVE_QUERY="STOP SLAVE; | ||
CHANGE MASTER TO | ||
MASTER_HOST='${MYSQL_SOURCE_IP}', | ||
MASTER_USER='${MYSQL_SOURCE_USER}', | ||
MASTER_PASSWORD='${MYSQL_SOURCE_PASSWORD}', | ||
MASTER_LOG_FILE='${MYSQL_SOURCE_LOG_FILE}', | ||
MASTER_LOG_POS=${MYSQL_SOURCE_LOG_POS}; | ||
START SLAVE;" | ||
fi | ||
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echo "${MYSQL_SETUP_SLAVE_QUERY}" >"${MYSQL_SETUP_SLAVE_SQL}" | ||
scp "$MYSQL_SETUP_SLAVE_SQL" \ | ||
"${REPLICA_SSH_USER}@${REPLICA_IP}:${MYSQL_SETUP_SLAVE_SQL}" | ||
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# Use sudo to make sure we use the right ~/.my.cnf file with maintenance | ||
# credentials | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" \ | ||
"sudo mysql -e 'SOURCE ${MYSQL_SETUP_SLAVE_SQL};'" | ||
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ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" 'sudo mysqladmin start-slave' | ||
ssh "${REPLICA_SSH_USER}@${REPLICA_IP}" "sudo chown -R mysql:mysql ${MYSQL_DATADIR}" |
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