MySync is mysql high-availability and cluster configuration tool. MySync is designed to switch master in homogeneous MySQL cluster in manual and automatic mode without data loose.
MySync is production-ready, it is being used in large production setups. We appreciate any kind of feedback and contribution to the project.
- MySQL 5.7+ with GTID's enabled
- MySQL cluster is homogeneous - all nodes have exactly the same data
- ZooKeeper database to keep state and locks
# required
gtid_mode = ON
enforce_gtid_consistency = ON
log_slave_updates = ON
binlog_format = ROW
# required, managed by mysync
read_only = ON
super_read_only = ON
offline_mode = ON
# recommended
sync_binlog = 1
innodb_flush_log_at_trx_commit = 1
log: /var/log/mysync/mysync.log
loglevel: Debug
lockfile: /var/run/mysync/mysync.lock
emergefile: /var/run/mysync/mysync.emerge
resetupfile: /var/run/mysync/mysync.resetup
resetup_crashed_hosts: False
db_timeout: 2s
db_lost_check_timeout: 5s
tick_interval: 5s
healthcheck_interval: 5s
info_file_handler_interval: 5s
dcs_wait_timeout: 30s
critical_disk_usage: 95.00
not_critical_disk_usage: 94.76
disable_semi_sync_replication_on_maintenance: true
keep_super_writable_on_critical_disk_usage: true
db_set_ro_timeout: 30s
db_set_ro_force_timeout: 60s
priority_choice_max_lag: 60s
offline_mode_enable_lag: 86400s
offline_mode_disable_lag: 300s
disable_set_readonly_on_lost: False
exclude_users:
- 'repl'
- 'admin'
- 'monitor'
- 'event_scheduler'
semi_sync: true
rpl_semi_sync_master_wait_for_slave_count: 1
semi_sync_enable_lag: 33554432
failover: true
failover_cooldown: 3600s
failover_delay: 60s
inactivation_delay: 120s
zookeeper:
session_timeout: 10s
namespace: /mysql/cluster_id_1
hosts:
- zk01.db.company.net:2181
- zk02.db.company.net:2181
- zk03.db.company.net:2181
mysql:
user: admin
password: **********
ssl_ca: /etc/mysql/ssl/allCAs.pem
replication_connect_retry: 10
replication_retry_count: 0
replication_heartbeat_period: 2
replication_port: 3306
replication_user: repl
replication_password: ********
replication_ssl_ca: /etc/mysql/ssl/allCAs.pem
port: 3306
stream_from_reasonable_lag: 5m
stream_from_max_catchup_wait: 5m
replication_repair_aggressive_mode: False
replication_repair_cooldown: 60s
replication_repair_max_attempts: 3
mysync hosts add fqdn1.db.company.net
mysync hosts add fqdn2.db.company.net
mysync hosts add fqdn3.db.company.net
mysync info -s
mysync switch --to fqdn2
mysync switch --from fqdn2
mysync maint on
mysync maint off
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