我正在使用 postdock/postgre 和 postdock/pgpool 安装具有高可用性的 postgresql。
这是我的 docker-compose.yml 文件：
version: '3'
networks:
cluster:
services:
pgmaster:
image: postdock/postgres
environment:
PARTNER_NODES: "pgmaster,pgslave"
CLUSTER_NODE_NETWORK_NAME: pgmaster
NODE_PRIORITY: 100
NODE_ID: 1
NODE_NAME: pgmaster
POSTGRES_PASSWORD: monkey_pass
POSTGRES_USER: monkey_user
POSTGRES_DB: monkey_db
CONFIGS: "listen_addresses:'*'"
CLUSTER_NAME: pg_cluster
REPLICATION_DB: replication_db
REPLICATION_USER: replication_user
REPLICATION_PASSWORD: replication_pass
ports:
- 5440:5432
networks:
- cluster
pgslave:
image: postdock/postgres
environment:
PARTNER_NODES: "pgmaster,pgslave"
REPLICATION_PRIMARY_HOST: pgmaster
NODE_ID: 2
NODE_NAME: pgslave
CLUSTER_NODE_NETWORK_NAME: pgslave
REPLICATION_PRIMARY_PORT: 5432
CONFIGS: "max_replication_slots:10"
ports:
- 5441:5432
networks:
- cluster
pgpool:
image: postdock/pgpool
environment:
PCP_USER: pcp_user
PCP_PASSWORD: pcp_pass
WAIT_BACKEND_TIME_OUT: 60
CHECK_USER: monkey_user
CHECK_PASS: monkey_pass
CHECK_PGCONNECT_TIMEOUT: 3
DB_USERS: monkey_user:monkey_pass
BACKEND: "0:pgmaster:5432:1:/var/lib/postgresql/data:ALLOW_TO_FAILOVER,1:pgslave::::"
REQUIRE_MIN_BACKENDS: 1
CONFIGS: "num_init_children:250,max_pool:4"
ports:
- 5432:5432
- 9898:9898
networks:
- cluster
当我运行
docker stack deploy -c docker-compose.yml master_slave_postgresID NAME MODE REPLICAS IMAGE PORTS
xpsa42e9ohd2 master_slave_postgres_pgmaster replicated 1/1 postdock/postgres:latest *:5440->5432/tcp
ld32o296p2np master_slave_postgres_pgpool replicated 0/1 postdock/pgpool:latest *:5432->5432/tcp, *:9898->9898/tcp
j7u8uwvbsjwm master_slave_postgres_pgslave replicated 1/1 postdock/postgres:latest *:5441->5432/tcp
当我查看 pgpool 的日志时，它会抛出以下错误：
[email protected] | >>> CLEANING environment (if required)...
[email protected] | >>> CLEANING environment (if required)...
[email protected] | >>> STARTING SSH (if required)...
[email protected] | >>> SSH is not enabled!
[email protected] | >>> CLEANING environment (if required)...
[email protected] | >>> STARTING SSH (if required)...
[email protected] | >>> CLEANING environment (if required)...
[email protected] | >>> SSH is not enabled!
[email protected] | >>> TURNING PGPOOL...
[email protected] | >>> STARTING SSH (if required)...
[email protected] | >>> STARTING SSH (if required)...
[email protected] | >>> SSH is not enabled!
[email protected] | >>> Opening access from all hosts by md5 in /usr/local/etc/pool_hba.conf
[email protected] | >>> TURNING PGPOOL...
[email protected] | >>> SSH is not enabled!
[email protected] | >>> Adding user pcp_user for PCP
[email protected] | >>> Opening access from all hosts by md5 in /usr/local/etc/pool_hba.conf
[email protected] | >>> TURNING PGPOOL...
[email protected] | >>> TURNING PGPOOL...
[email protected] | >>> Adding user pcp_user for PCP
[email protected] | >>> Opening access from all hosts by md5 in /usr/local/etc/pool_hba.conf
[email protected] | >>> Creating a ~/.pcppass file for pcp_user
[email protected] | >>> Opening access from all hosts by md5 in /usr/local/etc/pool_hba.conf
[email protected] | >>> Adding user pcp_user for PCP
[email protected] | >>> Adding users for md5 auth
[email protected] | >>> Adding user pcp_user for PCP
[email protected] | >>> Creating a ~/.pcppass file for pcp_user
[email protected] | >>>>>> Adding user monkey_user
[email protected] | >>> Adding users for md5 auth
[email protected] | >>> Creating a ~/.pcppass file for pcp_user
[email protected] | >>> Creating a ~/.pcppass file for pcp_user
[email protected] | >>>>>> Adding user monkey_user
[email protected] | >>> Adding users for md5 auth
[email protected] | >>> Adding check user 'monkey_user' for md5 auth
[email protected] | >>> Adding users for md5 auth
[email protected] | >>>>>> Adding user monkey_user
[email protected] | >>>>>> Adding user monkey_user
[email protected] | >>> Adding user 'monkey_user' as check user
[email protected] | >>> Adding check user 'monkey_user' for md5 auth
[email protected] | >>> Adding user 'monkey_user' as health-check user
[email protected] | >>> Adding user 'monkey_user' as check user
[email protected] | >>> Adding check user 'monkey_user' for md5 auth
[email protected] | >>> Adding check user 'monkey_user' for md5 auth
[email protected] | >>> Adding user 'monkey_user' as health-check user
[email protected] | >>> Adding backends
[email protected] | >>> Adding user 'monkey_user' as check user
[email protected] | >>> Adding user 'monkey_user' as check user
[email protected] | >>> Adding user 'monkey_user' as health-check user
[email protected] | >>> Adding backends
[email protected] | >>> Checking if we have enough backends to start
[email protected] | >>> Adding user 'monkey_user' as health-check user
[email protected] | >>> Checking if we have enough backends to start
[email protected] | >>>>>> Can not start pgpool with REQUIRE_MIN_BACKENDS=1, BACKENDS_COUNT=0
[email protected] | >>> Adding backends
[email protected] | >>> Adding backends
[email protected] | >>>>>> Can not start pgpool with REQUIRE_MIN_BACKENDS=1, BACKENDS_COUNT=0
[email protected] | >>> Checking if we have enough backends to start
[email protected] | >>>>>> Can not start pgpool with REQUIRE_MIN_BACKENDS=1, BACKENDS_COUNT=0
[email protected] | >>> Checking if we have enough backends to start
[email protected] | >>>>>> Can not start pgpool with REQUIRE_MIN_BACKENDS=1, BACKENDS_COUNT=0
如何解决这个问题？我也尝试将 require_min_backends 更改为 0，但它不起作用，因为 pgpool 至少只从 1 个后端开始
PostDock 似乎没有维护。 最新版本于 2019 年发布。
使用 Docker 设置 PostgreSQL 集群的更好选择是使用
bitnami/postgres以下是如何设置复制集群的快速示例：
version: '2'
services:
postgresql-master:
image: 'bitnami/postgresql:latest'
ports:
- '5432'
volumes:
- 'postgresql_master_data:/bitnami/postgresql'
environment:
- POSTGRESQL_REPLICATION_MODE=master
- POSTGRESQL_REPLICATION_USER=repl_user
- POSTGRESQL_REPLICATION_PASSWORD=repl_password
- POSTGRESQL_USERNAME=my_user
- POSTGRESQL_PASSWORD=my_password
- POSTGRESQL_DATABASE=my_database
postgresql-slave:
image: 'bitnami/postgresql:latest'
ports:
- '5432'
depends_on:
- postgresql-master
environment:
- POSTGRESQL_REPLICATION_MODE=slave
- POSTGRESQL_REPLICATION_USER=repl_user
- POSTGRESQL_REPLICATION_PASSWORD=repl_password
- POSTGRESQL_MASTER_HOST=postgresql-master
- POSTGRESQL_PASSWORD=my_password
- POSTGRESQL_MASTER_PORT_NUMBER=5432
volumes:
postgresql_master_data:
文档链接。