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|
#!/bin/bash
set -e
PATH=$(dirname "$0"):$PATH
source rpc.bash
datadir=data
default_replica_host_file=$datadir/default-replica-host
replication_password_file=$datadir/replication-password
if [ -r "$default_replica_host_file" ]
then
read default_replica_host < "$default_replica_host_file"
fi
gen_password()
{
generated_password_length=32
generated_password=$(tr -cd a-zA-Z0-9 < /dev/urandom |
head -c "$generated_password_length")
[ "${#generated_password}" -eq "$generated_password_length" ]
printf '%s\n' "$generated_password"
}
if ! [ -e "$replication_password_file" ]
then
gen_password > "$replication_password_file"
fi
if [ -r "$replication_password_file" ]
then
read replication_password < "$replication_password_file"
[ "${#replication_password}" -ge 30 ]
fi
primary_host=$(hostname --fqdn)
replica_host=${1:-$default_replica_host}
replication_user=replication
[ "$primary_host" ]
[ "$replica_host" ]
[ "$replication_password" ]
run_primary()
{
(set -x
: primary : $1 $2 ${3:+ ...})
BASH_RPC_REMOTE_DEST=$primary_host remote_run_function "$@"
}
run_replica()
{
(set -x
: replica : $1 $2 ${3:+ ...})
BASH_RPC_REMOTE_DEST=$replica_host remote_run_function "$@"
}
show_hostnames()
{
printf \
"==> %s %s <==\n %s\n" \
"$(hostname -A)" \
"$(hostname -I)" \
"$(uptime)"
}
check_db()
{
show_hostnames
mariadb --skip-reconnect -t <<END
select @@hostname, @@server_id, @@gtid_slave_pos, @@sql_log_bin;
END
}
create_backup()
{
set -e
mariabackup_target_dir=/var/mariadb/backup
binlog_info_file=$mariabackup_target_dir/xtrabackup_binlog_info
[ -e "$binlog_info_file" ] && return
mkdir -p "$mariabackup_target_dir"
marialog=$(mktemp)
e=0
(set -- \
-u root \
--target-dir="$mariabackup_target_dir"
exec >"$marialog" 2>&1
set -x
mariabackup --backup --rsync "$@"
mariabackup --prepare "$@") || e=$?
if [ "$e" = 0 -a -e "$binlog_info_file" ]
then
tail -v -n2 "$marialog" >&2
rm "$marialog"
else
cat "$marialog" >&2
false
fi
}
delete_backup()
{
set -x
rm -r /var/mariadb/backup
}
send_backup()
{
mariabackup_target_dir=/var/mariadb/backup
set -x
rsync -zaR -- /./"${mariabackup_target_dir#/}" "$1":/
}
stop_database_server_and_remove_database_files()
{
livedb=/var/lib/mysql
set -e
if [ -e "$livedb" ]
then
if [ "$(systemctl is-active mariadb)" = active ]
then
systemctl stop mariadb
fi
livedb_backup=$livedb~$(date -Ins)
mv -v -T -- "$livedb" "$livedb_backup"
mkdir "$livedb"
chown --reference="$livedb_backup" "$livedb"
chmod --reference="$livedb_backup" "$livedb"
fi
}
restore_from_backup()
{
mariabackup_target_dir=/var/mariadb/backup
set -e
stop_database_server_and_remove_database_files
marialog=$(mktemp)
exec >"$marialog" 2>&1
set -- \
-u root \
--target-dir="$mariabackup_target_dir"
if mariabackup --move-back "$@"
then
tail -v -n2 "$marialog" >&2
# Can't believe mariabackup
# is so primitive as to
# recommend this chown in its
# documentation
chown -R mysql:mysql /var/lib/mysql
systemctl start mariadb
else
cat "$marialog" >&2
fi
}
enable_replication()
{
primary_host=$1
replication_user=$2
replication_password=$3
mariabackup_target_dir=/var/mariadb/backup
binlog_info_file=$mariabackup_target_dir/xtrabackup_binlog_info
set -e
read master_log_file master_log_pos gtid_slave_pos < $binlog_info_file
tee /dev/stderr <<END | mariadb --skip-reconnect -t
STOP SLAVE;
SET GLOBAL gtid_slave_pos = "$gtid_slave_pos";
CHANGE MASTER TO
MASTER_HOST='$primary_host',
MASTER_USER='$replication_user',
MASTER_PASSWORD='$replication_password',
MASTER_USE_GTID=slave_pos;
START SLAVE;
SHOW SLAVE STATUS\G
END
set -x
rm -r /var/mariadb/backup
}
create_replication_user()
{
mariadb --skip-reconnect -t <<END
CREATE OR REPLACE USER '$2'@'$1' IDENTIFIED BY '$3';
GRANT REPLICATION SLAVE ON *.* TO '$2'@'$1';
END
}
showvars()
{
for h in "$@"
do
run_$h mariadb --skip-reconnect -t <<END
select VARIABLE_NAME,SESSION_VALUE,GLOBAL_VALUE
from INFORMATION_SCHEMA.SYSTEM_VARIABLES
where VARIABLE_NAME LIKE '%SLAVE%' \G
END
done
}
set -e
run_primary check_db
run_replica check_db
: showvars replica
: exit
run_primary create_replication_user \
"$replica_host" \
"$replication_user" \
"$replication_password"
run_primary create_backup
run_primary send_backup "$replica_host"
run_replica restore_from_backup
run_replica enable_replication \
"$primary_host" \
"$replication_user" \
"$replication_password"
run_replica check_db
run_primary delete_backup
run_primary check_db
|
