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|
#!/bin/bash
set -e
PATH=./src:$PATH
source rpc.bash
default_slave_remote_file=data/default-slave-remote
master_password_file=data/mysql-master-password
if [ -r "$default_slave_remote_file" ]
then
read default_remote_host < "$default_slave_remote_file"
fi
gen_password()
{
generated_password_length=32
generated_password=$(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 "$master_password_file" ]
then
gen_password > "$master_password_file"
fi
if [ -r "$master_password_file" ]
then
read master_password < "$master_password_file"
[ "${#master_password}" -ge 30 ]
fi
our_host=$(hostname --fqdn)
remote_host=${1:-$default_remote_host}
[ "$our_host" ]
[ "$remote_host" ]
[ "$master_password" ]
primarydb_host=$our_host
replicadb_host=$remote_host
replication_user=replication
replication_password=$master_password
run_primary()
{
BASH_RPC_REMOTE_DEST=$primarydb_host remote_run_function "$@"
}
run_replica()
{
BASH_RPC_REMOTE_DEST=$replicadb_host remote_run_function "$@"
}
primarydb()
{
run_primary mariadb -t
}
replicadb()
{
run_replica mariadb -t
}
syscheck()
{
printf \
"==> %s %s <==\n %s\n" \
"$(hostname -A)" \
"$(hostname -I)" \
"$(uptime)"
}
dbcheck()
{
syscheck
mariadb -t <<END | sed 's/^/ /'
select @@hostname, @@server_id, @@gtid_slave_pos, @@sql_log_bin;
END
}
create_backup()
{
mariabackup_target_dir=/var/mariadb/backup
mkdir -p "$mariabackup_target_dir"
mariabackup -u root --backup --target-dir="$mariabackup_target_dir"
mariabackup -u root --prepare --target-dir="$mariabackup_target_dir"
}
send_backup()
{
mariabackup_target_dir=/var/mariadb/backup
rsync -zRaP -- /./"$mariabackup_target_dir" "$1":/
}
enable_replication()
{
our_host=$1
replication_user=$2
replication_password=$3
mariabackup_target_dir=/var/mariadb/backup
binlog_info_file=$mariabackup_target_dir/xtrabackup_binlog_info
read master_log_file master_log_pos gtid_slave_pos < $binlog_info_file || return
mariadb -t <<END
SET GLOBAL gtid_slave_pos = "$gtid_slave_pos";
CHANGE MASTER TO
MASTER_HOST='$our_host',
MASTER_USER='$replication_user',
MASTER_PASSWORD='$replication_password',
MASTER_USE_GTID=slave_pos;
START SLAVE;
END
}
create_replication_user()
{
mariadb -t <<END
CREATE OR REPLACE USER '$1' IDENTIFIED BY '$2';
GRANT REPLICATION SLAVE ON *.* TO '$1';
END
}
showvars()
{
for db in primarydb replicadb
do
$db <<END
select VARIABLE_NAME,SESSION_VALUE,GLOBAL_VALUE
from INFORMATION_SCHEMA.SYSTEM_VARIABLES
where VARIABLE_NAME='sql_log_bin' or VARIABLE_NAME='HOSTNAME' \G
END
done
}
checkboth()
{
for h in primary replica
do
run_$h dbcheck
done
}
if false
then
checkboth
showvars
fi
mariabackup_target_dir=/var/mariadb/backup
if [ ! -d "$mariabackup_target_dir" ]
then
run_primary create_replication_user \
"$replication_user'@'$replicadb_host" \
"$replication_password"
run_primary create_backup "$replicadb_host"
fi
run_primary send_backup "$replicadb_host"
run_replica enable_replication "$our_host" "$replication_user" "$replication_password"
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