HAProxy + Galera Cluster (MariaDB) 1/2

Galera Cluster

우분투 20.04 에서 진행한다. 패키지관리자에서 제공하는 mariadb-server를 설치하면 galera3이 같이 설치된다.

$ apt update && apt upgrade -y
$ apt install -y mariadb-server

Galera 클러스터 설정하기

  1. wsrep_cluster_address : 전체 노드의 아이피를 쉼표로 구분해서 모두 입력
  2. wsrep_node_address : 현재 노드의 아이피를 입력
  3. wsrep_node_name : 현재 노드를 구분할 이름을 입력

Database1

/etc/mysql/mariadb.conf.d/60-galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0

# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so

# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://172.16.0.20,172.16.0.21,172.16.0.22"

# Galera Synchronization Configuration
wsrep_sst_method=rsync

# Galera Node Configuration
wsrep_node_address="172.16.0.20"
wsrep_node_name="node1"

Database2

/etc/mysql/mariadb.conf.d/60-galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0

# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so

# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://172.16.0.20,172.16.0.21,172.16.0.22"

# Galera Synchronization Configuration
wsrep_sst_method=rsync

# Galera Node Configuration
wsrep_node_address="172.16.0.21"
wsrep_node_name="node2"

Database3

/etc/mysql/mariadb.conf.d/60-galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0

# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so

# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://172.16.0.20,172.16.0.21,172.16.0.22"

# Galera Synchronization Configuration
wsrep_sst_method=rsync

# Galera Node Configuration
wsrep_node_address="172.16.0.22"
wsrep_node_name="node3"

서비스 재시작

각 노드별로 실행해준다

$ systemctl restart mariadb.service

클러스터 상태 확인

$ mysql -uroot -p
MariaDB [(none)] > show status like 'wsreq%';
+-------------------------------+----------------------------------------------------------+
| Variable_name                 | Value                                                    |
+-------------------------------+----------------------------------------------------------+
| wsrep_applier_thread_count    | 1                                                        |
| wsrep_apply_oooe              | 0.000000                                                 |
| wsrep_apply_oool              | 0.000000                                                 |
| wsrep_apply_window            | 1.000000                                                 |
| wsrep_causal_reads            | 0                                                        |
| wsrep_cert_deps_distance      | 95.038207                                                |
| wsrep_cert_index_size         | 106                                                      |
| wsrep_cert_interval           | 0.000000                                                 |
| wsrep_cluster_conf_id         | 22                                                       |
| wsrep_cluster_size            | 3                                                        |
| wsrep_cluster_state_uuid      | 2f9b1216-670b-11ed-a410-02c6026a7d9b                     |
| wsrep_cluster_status          | Primary                                                  |
| wsrep_cluster_weight          | 3                                                        |
| wsrep_commit_oooe             | 0.000000                                                 |
| wsrep_commit_oool             | 0.000000                                                 |
| wsrep_commit_window           | 1.000000                                                 |
| wsrep_connected               | ON                                                       |
| wsrep_desync_count            | 0                                                        |
| wsrep_evs_delayed             |                                                          |
| wsrep_evs_evict_list          |                                                          |
| wsrep_evs_repl_latency        | 0.00183486/0.00210722/0.00237959/0.000272366/2           |
| wsrep_evs_state               | OPERATIONAL                                              |
| wsrep_flow_control_paused     | 0.000068                                                 |
| wsrep_flow_control_paused_ns  | 395662483                                                |
| wsrep_flow_control_recv       | 15                                                       |
| wsrep_flow_control_sent       | 1                                                        |
| wsrep_gcomm_uuid              | 9ca4e10d-6a23-11ed-9e58-135c9b8d1ba7                     |
| wsrep_incoming_addresses      | 172.16.0.20:3306,172.16.0.21:3306,172.16.0.22:3306 |
| wsrep_last_committed          | 1941702                                                  |
| wsrep_local_bf_aborts         | 0                                                        |
| wsrep_local_cached_downto     | 1885300                                                  |
| wsrep_local_cert_failures     | 0                                                        |
| wsrep_local_commits           | 0                                                        |
| wsrep_local_index             | 1                                                        |
| wsrep_local_recv_queue        | 0                                                        |
| wsrep_local_recv_queue_avg    | 0.401237                                                 |
| wsrep_local_recv_queue_max    | 110                                                      |
| wsrep_local_recv_queue_min    | 0                                                        |
| wsrep_local_replays           | 0                                                        |
| wsrep_local_send_queue        | 0                                                        |
| wsrep_local_send_queue_avg    | 0.000000                                                 |
| wsrep_local_send_queue_max    | 1                                                        |
| wsrep_local_send_queue_min    | 0                                                        |
| wsrep_local_state             | 4                                                        |
| wsrep_local_state_comment     | Synced                                                   |
| wsrep_local_state_uuid        | 2f9b1216-670b-11ed-a410-02c6026a7d9b                     |
| wsrep_open_connections        | 0                                                        |
| wsrep_open_transactions       | 0                                                        |
| wsrep_protocol_version        | 9                                                        |
| wsrep_provider_name           | Galera                                                   |
| wsrep_provider_vendor         | Codership Oy <info@codership.com>                        |
| wsrep_provider_version        | 3.29(ra60e019)                                           |
| wsrep_ready                   | ON                                                       |
| wsrep_received                | 57714                                                    |
| wsrep_received_bytes          | 17158682                                                 |
| wsrep_repl_data_bytes         | 0                                                        |
| wsrep_repl_keys               | 0                                                        |
| wsrep_repl_keys_bytes         | 0                                                        |
| wsrep_repl_other_bytes        | 0                                                        |
| wsrep_replicated              | 0                                                        |
| wsrep_replicated_bytes        | 0                                                        |
| wsrep_rollbacker_thread_count | 1                                                        |
| wsrep_thread_count            | 2                                                        |
+-------------------------------+----------------------------------------------------------+

wsrep_cluster_size : 클러스터에 가입된 있는 노드수
wsrep_incoming_addresses : 클러스터에 가입된 아이피
wsrep_local_state_comment : 현재 노드 상태 (다른 노드들과 데이터가 동기화되어 있는 상태면 Synced)